CN103405221A - Temperature compensation method of pressure sensor for blood pressure measurement - Google Patents
Temperature compensation method of pressure sensor for blood pressure measurement Download PDFInfo
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- CN103405221A CN103405221A CN201310360293XA CN201310360293A CN103405221A CN 103405221 A CN103405221 A CN 103405221A CN 201310360293X A CN201310360293X A CN 201310360293XA CN 201310360293 A CN201310360293 A CN 201310360293A CN 103405221 A CN103405221 A CN 103405221A
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Abstract
The invention discloses a temperature compensation method of a pressure sensor for blood pressure measurement. The temperature compensation method comprises the steps of recording a temperature sampling value of a making environment while making a sensor data table by virtue of the characteristic that the slope of a pressure-voltage characteristic curve sensed by a piezoelectric sensor is kept constant when the temperature changes, calculating a zero-point voltage during actual measurement by software and then correcting a zero point before table look-up. The temperature compensation method does not need a hardware compensation circuit, and has the advantages of low cost, high integration and reliability and easiness in production and implementation.
Description
Technical field
The invention belongs to technical field of medical instruments, particularly relate to a kind of blood pressure measurement temperature compensation method for pressure sensor.
Background technology
The working pressure sensor obtains barometric information and fluctuation pressure signal in electronic blood pressure measurement equipment, and what usually adopt at present is capacitance pressure transducer, and piezoelectric transducer.Although capacitance pressure transducer, is simple in structure, low price, highly sensitive, it has output nonlinear, and the shortcoming that parasitic capacitance and distribution capacity are larger on the impact of sensitivity and certainty of measurement, can't meet the requirement of clinical use.Piezoelectric transducer has had again inner integrated amplification and temperature-compensation circuit and without amplifying and two kinds of temperature-compensation circuits.The sensor of integrated amplification and temperature-compensation circuit is reliably accurate, but volume is larger, and cost high (price is more than 100 yuan) is unfavorable to the product miniaturization.The sensor bulk of not integrated amplification and temperature-compensation circuit is little, cost low (general 10 yuan of left and right), but need extra amplification and temperature-compensation circuit just can meet the demands.
Summary of the invention
The object of the invention is to provide a kind of blood pressure measurement temperature compensation method for pressure sensor that carries out temperature-compensating by software.
The present invention for achieving the above object, adopts following technical scheme:
A kind of blood pressure measurement temperature compensation method for pressure sensor, comprise the steps:
(1) make " pressure-voltage " tables of data of piezoelectric pressure indicator timing signal, record simultaneously the temperature Wd0 of timing signal;
(2) piezoelectric pressure indicator detects blood pressure signal, and after amplifier amplifies output voltage signal, the temperature Wd1 when obtaining the force value ZP ' of static 0 and record simultaneously measurement by " pressure-voltage " tables of data in step (1);
(3) Wd0 and Wd1 are compared, as Wd0 by formula ZP=ZP '-d*x, calculate the initial pressure value ZP of dynamic 0 while measuring, d=Wd1-Wd0 during Wd1; When Wd0<Wd1, calculate the initial pressure value ZP of dynamic 0 while measuring, d=Wd0-Wd1 by formula ZP=ZP '+d*x; X is the performance constant of piezoelectric pressure indicator;
(4) take the initial pressure value ZP of dynamic 0 is benchmark, piezoelectric pressure indicator is detected to blood pressure signal and revise, and completes temperature-compensating.
It is further characterized in that: described " pressure-voltage " tables of data leaves in MCU, and calculates the initial pressure value ZP of dynamic 0 by MCU.
Preferably: described piezoelectric pressure indicator is the MPS2100 pressure transducer.
When the present invention utilized piezoelectric transducer to work as variations in temperature, " pressure-voltage " characteristic curve of sensing kept the constant characteristic of slope.Utilize these characteristics to carry out temperature-compensating comparatively simple, consider that temperature-compensating increase cost and the manufacture debugging difficulty of hardware means is high, design realizes temperature-compensating with the inner integrated temperature sensor functionality of MCU.When making the sensing data table, record the temperature sampling value of production environment, before tabling look-up, get final product revising zero point later.The present invention has that cost is low, and integrated level and reliability are high, are easy to produce the advantage of realization.
The accompanying drawing explanation
Fig. 1 is temperature compensation algorithm schematic flow sheet of the present invention.
The specific embodiment
A kind of blood pressure measurement temperature compensation method for pressure sensor, comprise the steps: as shown in Figure 1
(1) make " pressure-voltage " tables of data of piezoelectric pressure indicator timing signal, record simultaneously the temperature Wd0 of timing signal;
(2) piezoelectric pressure indicator detects blood pressure signal, and after amplifier amplifies output voltage signal, the temperature Wd1 when obtaining the force value ZP ' of static 0 and record simultaneously measurement by " pressure-voltage " tables of data in step (1);
(3) Wd0 and Wd1 are compared, as Wd0 by formula ZP=ZP '-d*x, calculate the initial pressure value ZP of dynamic 0 while measuring, d=Wd1-Wd0 during Wd1; When Wd0<Wd1, calculate the initial pressure value ZP of dynamic 0 while measuring, d=Wd0-Wd1 by formula ZP=ZP '+d*x; X is the performance constant (this constant is obtained by test and mathematical statistics analysis) of piezoelectric pressure indicator;
(4) take the initial pressure value ZP of dynamic 0 is benchmark, piezoelectric pressure indicator is detected to blood pressure signal and revise, and completes temperature-compensating.
Described " pressure-voltage " tables of data leaves in MCU, and calculates the initial pressure value ZP of dynamic 0 by MCU.Described piezoelectric pressure indicator is the MPS2100 pressure transducer.
When the present invention utilized piezoelectric transducer to work as variations in temperature, " pressure-voltage " characteristic curve of sensing kept the constant characteristic of slope.Utilize these characteristics to carry out temperature-compensating comparatively simple, consider that temperature-compensating increase cost and the manufacture debugging difficulty of hardware means is high, design realizes temperature-compensating with the inner integrated temperature sensor functionality of MCU.When making the sensing data table, record the temperature sampling value of production environment, before tabling look-up, get final product revising zero point later.The present invention has that cost is low, and integrated level and reliability are high, are easy to produce the advantage of realization.
Claims (3)
1. a blood pressure measurement temperature compensation method for pressure sensor, comprise the steps:
(1) make " pressure-voltage " tables of data of piezoelectric pressure indicator timing signal, record simultaneously the temperature Wd0 of timing signal;
(2) piezoelectric pressure indicator detects blood pressure signal, and after amplifier amplifies output voltage signal, the temperature Wd1 when obtaining the force value ZP ' of static 0 and record simultaneously measurement by " pressure-voltage " tables of data in step (1);
(3) Wd0 and Wd1 are compared, as Wd0 by formula ZP=ZP '-d*x, calculate the initial pressure value ZP of dynamic 0 while measuring, d=Wd1-Wd0 during Wd1; When Wd0<Wd1, calculate the initial pressure value ZP of dynamic 0 while measuring, d=Wd0-Wd1 by formula ZP=ZP '+d*x; X is the performance constant of piezoelectric pressure indicator;
(4) take the initial pressure value ZP of dynamic 0 is benchmark, piezoelectric pressure indicator is detected to blood pressure signal and revise, and completes temperature-compensating.
2. blood pressure measurement temperature compensation method for pressure sensor according to claim 1, it is characterized in that: described " pressure-voltage " tables of data leaves in MCU, and calculates the initial pressure value ZP of dynamic 0 by MCU.
3. blood pressure measurement temperature compensation method for pressure sensor according to claim 1, it is characterized in that: described piezoelectric pressure indicator is the MPS2100 pressure transducer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310360293XA CN103405221A (en) | 2013-08-19 | 2013-08-19 | Temperature compensation method of pressure sensor for blood pressure measurement |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310360293XA CN103405221A (en) | 2013-08-19 | 2013-08-19 | Temperature compensation method of pressure sensor for blood pressure measurement |
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| CN103405221A true CN103405221A (en) | 2013-11-27 |
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| CN201310360293XA Pending CN103405221A (en) | 2013-08-19 | 2013-08-19 | Temperature compensation method of pressure sensor for blood pressure measurement |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110074767A (en) * | 2019-05-30 | 2019-08-02 | 江苏富林医疗设备有限公司 | Can temperature-compensating electronic sphygmomanometer |
| CN116222713A (en) * | 2023-03-21 | 2023-06-06 | 深圳艾依灵科技有限公司 | Sanitation truck weighing sensor and control method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5135002A (en) * | 1989-08-29 | 1992-08-04 | Abbott Laboratories | Pressure transducer compensation system |
| CN1582845A (en) * | 2003-08-22 | 2005-02-23 | 香港中文大学 | Blood pressure measuring method based on photoelectric plethysmographic signals with temperature compensation |
| TW201235008A (en) * | 2011-02-18 | 2012-09-01 | Avita Corp | Pressure sensor |
-
2013
- 2013-08-19 CN CN201310360293XA patent/CN103405221A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5135002A (en) * | 1989-08-29 | 1992-08-04 | Abbott Laboratories | Pressure transducer compensation system |
| CN1582845A (en) * | 2003-08-22 | 2005-02-23 | 香港中文大学 | Blood pressure measuring method based on photoelectric plethysmographic signals with temperature compensation |
| TW201235008A (en) * | 2011-02-18 | 2012-09-01 | Avita Corp | Pressure sensor |
Non-Patent Citations (2)
| Title |
|---|
| 杨雪 等: "压力传感器温度补偿各种算法的比较分析", 《电子设计工程》 * |
| 王志敏: "压力传感器的温度补偿", 《自动化与仪表》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110074767A (en) * | 2019-05-30 | 2019-08-02 | 江苏富林医疗设备有限公司 | Can temperature-compensating electronic sphygmomanometer |
| CN116222713A (en) * | 2023-03-21 | 2023-06-06 | 深圳艾依灵科技有限公司 | Sanitation truck weighing sensor and control method thereof |
| CN116222713B (en) * | 2023-03-21 | 2023-09-01 | 深圳艾依灵科技有限公司 | Sanitation truck weighing sensor and control method thereof |
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Application publication date: 20131127 |