CN104502728A - Probe interface used for measuring resistivity - Google Patents
Probe interface used for measuring resistivity Download PDFInfo
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- CN104502728A CN104502728A CN201410624491.7A CN201410624491A CN104502728A CN 104502728 A CN104502728 A CN 104502728A CN 201410624491 A CN201410624491 A CN 201410624491A CN 104502728 A CN104502728 A CN 104502728A
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Abstract
The invention relates to the logging field and discloses a probe interface used for measuring resistivity. The probe interface comprises an interface portion and a long-strip board-shaped probe body, wherein the interface portion is formed by multiple parallel conductive contacts, the interface portion is arranged at the top end of the probe body, the probe body comprises a clamping portion arranged at the middle upper segment of the probe body and an electrode portion arranged at the lower portion of the clamping portion, width of the clamping portion becomes greater compared with width of the upper portion, two sides of the clamping portion are provided with clamping arms, clamping gaps used for clamping a slurry tank port are formed between lower ends of the clamping arms and the clamping portion, the electrode portion is provided with a current electrode and a voltage electrode respectively used for acquiring current and voltage of slurry, and the current electrode and the voltage electrode are respectively connected with different conductive contacts through leads. The probe interface used for measuring resistivity has a smart structure, requires no AC power supply, is convenient to carry and further has properties of simple manufacturing process and low cost.
Description
Technical field
The present invention relates to well logging field, particularly relate to a kind of probe interface of measured resistivity.
Background technology
In well logging industry, by feeding certain electric current to mud, making diverse location in mud produce potential difference (PD), thus calculating the resistivity of mud.Mud resistivity, the explanation for geologic logging data provides reliable reference data.In prior art, measure mud resistivity and mainly adopt mud tank method, need to be equipped with huge land-based AC during measurement to power instrumentation and testing equipment box, described measuring equipment case needs artificial wiring to carry out measurement mud resistivity, operation more complicated, wiring makes mistakes and measurement result can be caused not right, even causes big current to cause personal injury, and measure the mud resistivity value of result needs under artificial calculating or inspection information just can obtain standard temperature obtained, not intuitively easy.
Secondly, the container holding mud is the mud tank that madial wall is embedded with electrode, and mud is a kind of corrosive liquids being mixed with number of chemical material, and after finishing using, the cleaning of mud tank is more difficult, if cleaning force is spent greatly, easily causes the damage of electrode; Inevitably, after repeatedly using, there is electrode polarization phenomenon, reduce measuring accuracy, affect measurement quality in mud tank.
To sum up, research and develop a miniaturization, handling safety, be easy to carry, mud resistivity measurement mechanism that measuring accuracy is high, seem and be even more important.
Summary of the invention
For overcoming the deficiencies in the prior art, the present invention seeks to: the probe interface providing a kind of measured resistivity, compact structure of the present invention, easy and simple to handle, measuring accuracy is high.
In order to solve the technical matters in background technology, the invention provides a kind of probe interface of measured resistivity, comprise the probe body of interface portion and long strip-board shape, described interface portion is made up of side by side several conductive contact blades, described interface portion is arranged at the top of probe body, described probe body comprises the clamping part being located at epimere in probe body and the electrode section be located at below clamping part, the width of described clamping part becomes large compared with the width above it, the both sides of clamping part are provided with clamping limb, the clamping gap for clamping mud tank tank mouth is formed between the lower end of described clamping limb and described clamping part, described electrode section is provided with galvanic electrode for obtaining mud electric current and voltage and voltage electrode, described galvanic electrode is connected from different conductive contact blades respectively by wire with voltage electrode.
Preferably, described galvanic electrode comprises the first galvanic electrode and second galvanic electrode of sheet, voltage electrode comprises the first voltage electrode and second voltage electrode of sheet, the first galvanic electrode, the first voltage electrode, the second voltage electrode and the second galvanic electrode is provided with successively from the upper end of electrode section to lower end, a certain distance is provided with between described first voltage electrode and the second voltage electrode, the size of any two electrodes is identical, and any one electrode is attached at the probe body pros and cons of sustained height through probe body decile.
Described galvanic electrode comprises the first galvanic electrode and second galvanic electrode of sheet, voltage electrode comprises the first voltage electrode and second voltage electrode of sheet, the first galvanic electrode is provided with successively to lower end from the upper end of electrode section, first voltage electrode, second voltage electrode and the second galvanic electrode, a certain distance is provided with between described first voltage electrode and the second voltage electrode, the size of any two electrodes is identical, any one electrode decile is attached at the probe body pros and cons of sustained height, and the electrode slice being provided with the hole of the electrode slice of the probe body pros and cons running through sustained height or the probe body pros and cons of sustained height is coupled together by wire.
Preferably, the spacing range between described first voltage electrode and the second voltage electrode is 2.5-4 times of electrode horizontal length.
Alternatively, described electrode section is provided with temperature sensor between the first voltage electrode and the second voltage electrode, the two ends of described temperature sensor are connected with two conductive contact blades by wire.
Preferably, the horizontal length of any one electrode is 0.7-0.9 times of mud tank internal diameter.
Particularly, the width of electrode section lower end becomes large compared with the width on top, and the width of described electrode section lower end is less than the internal diameter of the mud tank for filling mud to be measured, and probe body lower surface is provided with rounding.
Particularly, the pros and cons of described interface portion is equipped with and is no less than 6 conductive contact blades.
Particularly, distance between described clamping part and probe body lower end is less than the degree of depth of mud tank, the width on top, described clamping gap is not more than the tank wall thickness of mud tank, the width of bottom, described clamping gap is not less than the tank wall thickness of mud tank, and the horizontal range between two clamping limb lower ends equals the tank mouth external diameter of mud tank.
Preferably, the inside diameter ranges of described mud tank is 15-30mm.
The principle of the probe interface of measured resistivity of the present invention 1. feeds certain electric current to mud, makes diverse location in mud produce potential difference (PD), can calculate the resistance of mud accordingly, according to formula
measure the effective cross section sum length of mud resistance, can mud resistivity be obtained; 2. the electrode in outside is that mud is powered, two electrode measurement electric potential differences of inner side, and the reasonable layout of electrode ensure that the accuracy of measurement; 3. adopt conductive contact blade to substitute wiring chieftain, simplify the operation step; 4. temperature sensor be arranged so that while test resistance rate, the measurement of fluid temperature can be carried out in real time; The probe interface of 5. measured resistivity is provided with the clamping limb for clamp mud tank, making probe insert time mud tank carries out measuring mud tank can taken away from desktop operation, improves the convenience measured; 6. probe and mud tank can be used as single use, solve a difficult problem for cleaning.
Adopt technique scheme, the present invention has following beneficial effect: 1. adopt conductive contact blade, and without the need to wiring, easy and simple to handle being not easy is made mistakes; 2. sonde configuration is light and handy, without the need to Alternating Current Power Supply, is easy to carry; 3. probe is provided with temperature sensor, measuring tempeature while measurement mud resistivity, conveniently carries out the resistivity conversion under different temperatures; 4. pop one's head in the clamping limb that is provided with for clamp mud tank, mud tank can follow probe taken away from desktop, measures easy and simple to handle; 5. the measurement mechanism manufacture craft of probe and mud tank is simple, cost-saving; 6. probe and mud tank can single use, avoid because Reusability causes electrode polarization and affect measuring accuracy.In sum, mud resistivity measuring sonde light structure of the present invention, easy and simple to handle, measuring accuracy is high.
Accompanying drawing explanation
In order to be illustrated more clearly in technical scheme of the present invention, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of the probe interface of the measured resistivity that the embodiment of the present invention provides;
Fig. 2 is the stereographic map of the probe interface of the measured resistivity that the embodiment of the present invention provides;
Fig. 3 is the structural representation of the mud tank that the embodiment of the present invention provides;
Fig. 4 is the probe interface of the measured resistivity that the embodiment of the present invention provides and the mud tank schematic diagram with the use of state.
In figure, Reference numeral corresponds to: 1-probe body, 11-rounding, 2-electrode section, 21-first galvanic electrode, 22-first voltage electrode, 23-second voltage electrode, 24-second galvanic electrode, 3-interface portion, 31-conductive contact blade, 4-clamping part, 41-clamping limb, 42-clamps gap, 5-mud tank, 6-temperature sensor.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under the prerequisite of not making creative work, all belongs to the scope of protection of the invention.
The structural representation of the probe interface of the measured resistivity that embodiment 1: Fig. 1 provides for the embodiment of the present invention, can be clear that in figure that the probe interface of measured resistivity comprises the probe body 1 of interface portion 3 and long strip-board shape, described interface portion 3 is made up of side by side several conductive contact blades 31, described interface portion 3 is arranged at the top of probe body 1, described probe body 1 comprises the clamping part 4 being located at epimere in probe body 1 and the electrode section 2 be located at below clamping part 4, the width of described clamping part 4 becomes large compared with the width above it, the both sides of clamping part 4 are provided with clamping limb 41, the clamping gap 42 for clamping mud tank 5 tank mouth is formed between the lower end of described clamping limb 41 and described clamping part 4, described electrode section 2 is provided with galvanic electrode for obtaining mud electric current and voltage and voltage electrode, described galvanic electrode is connected from different conductive contact blades 31 respectively by wire with voltage electrode, when stretching into when probe body 1 in the mud to be measured in mud tank 5, described clamping limb 41 is clamped the tank skin of mud tank 5 and mud tank 5 can be made to follow probe body 1 taken away from desktop.
Preferably, described galvanic electrode comprises the first galvanic electrode 21 and the second galvanic electrode 24 of sheet, voltage electrode comprises the first voltage electrode 22 and the second voltage electrode 23 of sheet, the first galvanic electrode 21 is provided with successively from the upper end of electrode section 2 to lower end, first voltage electrode 22, second voltage electrode 23 and the second galvanic electrode 24, four electrodes are parallel to each other, a certain distance is provided with between described first voltage electrode 22 and the second voltage electrode 23, the electric field of two electrodes can not be influenced each other, the size of any two electrodes is identical, any one electrode is attached at probe body 1 pros and cons of sustained height through probe body 1 decile, electromotive force in the mud of energising is uniformly distributed.
In the present embodiment, the internal diameter of mud tank 5 is preferably 20mm, the horizontal length of four electrodes is preferably 16mm, spacing between described first voltage electrode 22 and the second voltage electrode 23 is preferably 40mm, spacing between described first galvanic electrode 21 and the first voltage electrode 22 is preferably 10mm, and the spacing between described second voltage electrode 23 and the second galvanic electrode 24 is preferably 10mm.
Particularly, the width of electrode section 2 lower end becomes large compared with the width on top, the width of described electrode section 2 lower end is less than the internal diameter of the mud tank 5 for filling mud to be measured, when probe body 1 inserts in mud to be measured, the width of electrode section 2 lower end is greater than the length of electrode, effectively prevent probe front and back in mud tank from rocking to reduce mud to the impulsive force of electrode simultaneously, probe body 1 lower surface is provided with rounding 11, the resistance that when rounding 11 can reduce to insert in mud, probe body 1 is subject to, avoids the electrode of mud to electrode section 2 lower end during insertion to cause damage.
Alternatively, described electrode section 2 is provided with temperature sensor 6 between first voltage electrode 22 and the second voltage electrode 23, and the two ends of described temperature sensor 6 are connected with two conductive contact blades 31 by wire.Particularly, the pros and cons of described interface portion 3 is equipped with and is no less than 6 conductive contact blades 31, wherein have four conductive contact blades 31 respectively with an Electrode connection, two other conductive contact blade 31 is connected with temperature sensor 6.
Particularly, distance between described clamping part 4 and probe body 1 lower end is less than the degree of depth of mud tank 5, the width on top, described clamping gap 42 is not more than the tank wall thickness of mud tank 5, the width of bottom, described clamping gap 42 is not less than the tank wall thickness of mud tank 5, and the horizontal range between two clamping limb 41 lower ends equals the tank mouth external diameter of mud tank 5.
The structural representation of the probe interface of the measured resistivity that embodiment 2: Fig. 1 provides for the embodiment of the present invention, can be clear that in figure that the probe interface of measured resistivity comprises the probe body 1 of interface portion 3 and long strip-board shape, described interface portion 3 is made up of side by side several conductive contact blades 31, described interface portion 3 is arranged at the top of probe body 1, described probe body 1 comprises the clamping part 4 being located at epimere in probe body 1 and the electrode section 2 be located at below clamping part 4, the width of described clamping part 4 becomes large compared with the width above it, the both sides of clamping part 4 are provided with clamping limb 41, the clamping gap 42 for clamping mud tank 5 tank mouth is formed between the lower end of described clamping limb 41 and described clamping part 4, described electrode section 2 is provided with galvanic electrode for obtaining mud electric current and voltage and voltage electrode, described galvanic electrode is connected from different conductive contact blades 31 respectively by wire with voltage electrode, when stretching into when probe body 1 in the mud to be measured in mud tank 5, described clamping limb 41 is clamped the tank skin of mud tank 5 and mud tank 5 can be made to follow probe body 1 taken away from desktop.
Preferably, described galvanic electrode comprises the first galvanic electrode 21 and the second galvanic electrode 24 of sheet, voltage electrode comprises the first voltage electrode 22 and the second voltage electrode 23 of sheet, the first galvanic electrode 21 is provided with successively from the upper end of electrode section 2 to lower end, first voltage electrode 22, second voltage electrode 23 and the second galvanic electrode 24, four electrodes are parallel to each other, a certain distance is provided with between described first voltage electrode 22 and the second voltage electrode 23, the electric field of two electrodes can not be influenced each other, the size of any two electrodes is identical, any one electrode decile is attached at probe body 1 pros and cons of sustained height, and be provided with the hole of the electrode slice of probe body 1 pros and cons running through sustained height, when inserting mud when popping one's head in, mud is through hole, conductive drilling mud connects, electromotive force in the mud of energising is uniformly distributed.
In the present embodiment, the internal diameter of mud tank 5 is preferably 35mm, the horizontal length of four electrodes is preferably 22mm, spacing between described first voltage electrode 22 and the second voltage electrode 23 is preferably 55mm, spacing between described first galvanic electrode 21 and the first voltage electrode 22 is preferably 12mm, and the spacing between described second voltage electrode 23 and the second galvanic electrode 24 is preferably 12mm.
Particularly, the width of electrode section 2 lower end becomes large compared with the width on top, the width of described electrode section 2 lower end is less than the internal diameter of the mud tank 5 for filling mud to be measured, when probe body 1 inserts in mud to be measured, the width of electrode section 2 lower end is greater than the length of electrode, effectively prevent probe front and back in mud tank from rocking to reduce mud to the impulsive force of electrode simultaneously, probe body 1 lower surface is provided with rounding 11, the resistance that when rounding 11 can reduce to insert in mud, probe body 1 is subject to, avoids the electrode of mud to electrode section 2 lower end during insertion to cause damage.
Alternatively, described electrode section 2 is provided with temperature sensor 6 between first voltage electrode 22 and the second voltage electrode 23, and the two ends of described temperature sensor 6 are connected with two conductive contact blades 31 by wire.Particularly, the pros and cons of described interface portion 3 is equipped with and is no less than 6 conductive contact blades 31, wherein have four conductive contact blades 31 respectively with an Electrode connection, two other conductive contact blade 31 is connected with temperature sensor 6.
Particularly, distance between described clamping part 4 and probe body 1 lower end is less than the degree of depth of mud tank 5, the width on top, described clamping gap 42 is not more than the tank wall thickness of mud tank 5, the width of bottom, described clamping gap 42 is not less than the tank wall thickness of mud tank 5, and the horizontal range between two clamping limb 41 lower ends equals the tank mouth external diameter of mud tank 5.
The structural representation of the probe interface of the measured resistivity that embodiment 3: Fig. 1 provides for the embodiment of the present invention, can be clear that in figure that the probe interface of measured resistivity comprises the probe body 1 of interface portion 3 and long strip-board shape, described interface portion 3 is made up of side by side several conductive contact blades 31, described interface portion 3 is arranged at the top of probe body 1, described probe body 1 comprises the clamping part 4 being located at epimere in probe body 1 and the electrode section 2 be located at below clamping part 4, the width of described clamping part 4 becomes large compared with the width above it, the both sides of clamping part 4 are provided with clamping limb 41, the clamping gap 42 for clamping mud tank 5 tank mouth is formed between the lower end of described clamping limb 41 and described clamping part 4, described electrode section 2 is provided with galvanic electrode for obtaining mud electric current and voltage and voltage electrode, described galvanic electrode is connected from different conductive contact blades 31 respectively by wire with voltage electrode, when stretching into when probe body 1 in the mud to be measured in mud tank 5, described clamping limb 41 is clamped the tank skin of mud tank 5 and mud tank 5 can be made to follow probe body 1 taken away from desktop.
Preferably, described galvanic electrode comprises the first galvanic electrode 21 and the second galvanic electrode 24 of sheet, voltage electrode comprises the first voltage electrode 22 and the second voltage electrode 23 of sheet, the first galvanic electrode 21 is provided with successively from the upper end of electrode section 2 to lower end, first voltage electrode 22, second voltage electrode 23 and the second galvanic electrode 24, four electrodes are parallel to each other, a certain distance is provided with between described first voltage electrode 22 and the second voltage electrode 23, the electric field of two electrodes can not be influenced each other, the size of any two electrodes is identical, any one electrode decile is attached at probe body 1 pros and cons of sustained height, and the electrode slice of probe body 1 pros and cons of sustained height is coupled together by wire, electromotive force in the mud of energising is uniformly distributed.
In the present embodiment, the internal diameter of mud tank 5 is preferably 15mm, the horizontal length of four electrodes is preferably 10mm, spacing between described first voltage electrode 22 and the second voltage electrode 23 is preferably 35mm, spacing between described first galvanic electrode 21 and the first voltage electrode 22 is preferably 8mm, and the spacing between described second voltage electrode 23 and the second galvanic electrode 24 is preferably 8mm.
Particularly, the width of electrode section 2 lower end becomes large compared with the width on top, the width of described electrode section 2 lower end is less than the internal diameter of the mud tank 5 for filling mud to be measured, when probe body 1 inserts in mud to be measured, the width of electrode section 2 lower end is greater than the length of electrode, effectively prevent probe front and back in mud tank from rocking to reduce mud to the impulsive force of electrode simultaneously, probe body 1 lower surface is provided with rounding 11, the resistance that when rounding 11 can reduce to insert in mud, probe body 1 is subject to, avoids the electrode of mud to electrode section 2 lower end during insertion to cause damage.
Alternatively, described electrode section 2 is provided with temperature sensor 6 between first voltage electrode 22 and the second voltage electrode 23, and the two ends of described temperature sensor 6 are connected with two conductive contact blades 31 by wire.Particularly, the pros and cons of described interface portion 3 is equipped with and is no less than 6 conductive contact blades 31, wherein have four conductive contact blades 31 respectively with an Electrode connection, two other conductive contact blade 31 is connected with temperature sensor 6.
Particularly, distance between described clamping part 4 and probe body 1 lower end is less than the degree of depth of mud tank 5, the width on top, described clamping gap 42 is not more than the tank wall thickness of mud tank 5, the width of bottom, described clamping gap 42 is not less than the tank wall thickness of mud tank 5, and the horizontal range between two clamping limb 41 lower ends equals the tank mouth external diameter of mud tank 5.
The probe interface light structure of measured resistivity of the present invention is easy to carry, measuring accuracy is high, with there is the handset of the fixture that can clamp metal contact piece with the use of can measure mud resistivity and real time temperature simultaneously, operation capable of being taken away from desktop, simple and convenient, measurement mechanism manufacture craft is simply cost-saving.
Above disclosedly be only several preferred embodiment of the present invention, certainly can not limit the interest field of the present invention with this, therefore according to the equivalent variations that the claims in the present invention are done, still belong to the scope that the present invention is contained.
Claims (10)
1. the probe interface of a measured resistivity, it is characterized in that, comprise the probe body (1) of interface portion (3) and long strip-board shape, described interface portion (3) is made up of side by side several conductive contact blades (31), described interface portion (3) is arranged at the top of probe body (1), described probe body (1) comprises the clamping part (4) being located at epimere in probe body (1) and the electrode section (2) being located at clamping part (4) below, the width of described clamping part (4) becomes large compared with the width above it, the both sides of clamping part (4) are provided with clamping limb (41), the clamping gap (42) for clamping mud tank (5) tank mouth is formed between the lower end of described clamping limb (41) and described clamping part (4), described electrode section (2) is provided with galvanic electrode for obtaining mud electric current and voltage and voltage electrode, described galvanic electrode is connected from different conductive contact blade (31) respectively by wire with voltage electrode.
2. the probe interface of measured resistivity as claimed in claim 1, it is characterized in that, described galvanic electrode comprises the first galvanic electrode (21) and second galvanic electrode (24) of sheet, voltage electrode comprises the first voltage electrode (22) and second voltage electrode (23) of sheet, the first galvanic electrode (21) is provided with successively to lower end from the upper end of electrode section (2), first voltage electrode (22), second voltage electrode (23) and the second galvanic electrode (24), a certain distance is provided with between described first voltage electrode (22) and the second voltage electrode (23), the size of any two electrodes is identical, any one electrode is attached at probe body (1) pros and cons of sustained height through probe body (1) decile.
3. the probe interface of measured resistivity as claimed in claim 1, it is characterized in that, described galvanic electrode comprises the first galvanic electrode (21) and second galvanic electrode (24) of sheet, voltage electrode comprises the first voltage electrode (22) and second voltage electrode (23) of sheet, the first galvanic electrode (21) is provided with successively to lower end from the upper end of electrode section (2), first voltage electrode (22), second voltage electrode (23) and the second galvanic electrode (24), a certain distance is provided with between described first voltage electrode (22) and the second voltage electrode (23), the size of any two electrodes is identical, any one electrode decile is attached at probe body (1) pros and cons of sustained height, and the electrode slice being provided with the hole of the electrode slice of probe body (1) pros and cons running through sustained height or probe body (1) pros and cons of sustained height is coupled together by wire.
4. the probe interface of measured resistivity as claimed in claim 2, is characterized in that, the spacing range between described first voltage electrode (22) and the second voltage electrode (23) is 2.5-4 times of electrode horizontal length.
5. the probe interface of measured resistivity as claimed in claim 3, it is characterized in that, be provided with temperature sensor (6) between upper first voltage electrode (22) of described electrode section (2) and the second voltage electrode (23), the two ends of described temperature sensor (6) are connected with two conductive contact blades (31) by wire.
6. the probe interface of measured resistivity as claimed in claim 5, is characterized in that, the horizontal length of any one electrode is 0.7-0.9 times of mud tank (5) internal diameter.
7. the probe interface of measured resistivity as claimed in claim 1, it is characterized in that, the width of electrode section (2) lower end becomes large compared with the width on top, the width of described electrode section (2) lower end is less than the internal diameter of the mud tank (5) for filling mud to be measured, and probe body (1) lower surface is provided with rounding (11).
8. the probe interface of measured resistivity as claimed in claim 1, it is characterized in that, the pros and cons of described interface portion (3) is equipped with and is no less than 6 conductive contact blades (31).
9. the probe interface of measured resistivity as claimed in claim 5, it is characterized in that, distance between described clamping part (4) and probe body (1) lower end is less than the degree of depth of mud tank (5), the width on described clamping gap (42) top is not more than the tank wall thickness of mud tank (5), the width of described clamping gap (42) bottom is not less than the tank wall thickness of mud tank (5), and the horizontal range between two clamping limb (41) lower ends equals the tank mouth external diameter of mud tank (5).
10. as the probe interface of the measured resistivity in claim 1-9 as described in any one, it is characterized in that, the inside diameter ranges of described mud tank (5) is 15-30mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410624491.7A CN104502728A (en) | 2014-11-07 | 2014-11-07 | Probe interface used for measuring resistivity |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410624491.7A CN104502728A (en) | 2014-11-07 | 2014-11-07 | Probe interface used for measuring resistivity |
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| CN104502728A true CN104502728A (en) | 2015-04-08 |
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| CN201410624491.7A Pending CN104502728A (en) | 2014-11-07 | 2014-11-07 | Probe interface used for measuring resistivity |
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