CA2373366A1 - Predictive temperature measurement system - Google Patents
Predictive temperature measurement system Download PDFInfo
- Publication number
- CA2373366A1 CA2373366A1 CA002373366A CA2373366A CA2373366A1 CA 2373366 A1 CA2373366 A1 CA 2373366A1 CA 002373366 A CA002373366 A CA 002373366A CA 2373366 A CA2373366 A CA 2373366A CA 2373366 A1 CA2373366 A1 CA 2373366A1
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- CA
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- Prior art keywords
- temperature
- derivative
- processor
- thermometer
- estimate
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000009529 body temperature measurement Methods 0.000 title 1
- 238000000034 method Methods 0.000 claims abstract 16
- 238000005070 sampling Methods 0.000 claims 4
- 238000012935 Averaging Methods 0.000 claims 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/42—Circuits effecting compensation of thermal inertia; Circuits for predicting the stationary value of a temperature
Abstract
A method and device for rapidly predicting the temperature of an object through a sensor reading of the object's temperature by using a processor comprising finite impulse response (FIR) filters to determine the average value, the first derivative, and the second derivative of the sensed temperature based upon a predetermined number of temperature samples, apply a respective weighting factor to each of the average value, the first derivative, and the second derivative respectively, and calculate a temperature estimate by combining the weighted average value, the first derivative, and second derivative together with an offset factor.
Claims (41)
1. A thermometer for measuring the temperature of an object, comprising:
a sensor which, when positioned to sense the temperature of the object, provides a time varying temperature signal in response to the temperature of the object;
a processor connected so as to sample the temperature signal a predetermined number of times, to determine the average value, the first derivative, and the second derivative of the temperature signal based upon the predetermined number of samples acquired, and to combine the average value, first derivative, and second derivative to calculate an estimate of the temperature of the object and provide an estimated final temperature signal; and a display connected with the processor to receive and display the estimated final temperature signal.
a sensor which, when positioned to sense the temperature of the object, provides a time varying temperature signal in response to the temperature of the object;
a processor connected so as to sample the temperature signal a predetermined number of times, to determine the average value, the first derivative, and the second derivative of the temperature signal based upon the predetermined number of samples acquired, and to combine the average value, first derivative, and second derivative to calculate an estimate of the temperature of the object and provide an estimated final temperature signal; and a display connected with the processor to receive and display the estimated final temperature signal.
2. The thermometer of claim 1 wherein the processor further applies a separate weighting factor to each of the average value, the first derivative, and the second derivative prior to combining the average value, the first derivative, and the second derivative to calculate the temperature estimate.
3. The thermometer of claim 2 wherein the predetermined number of samples are acquired over a predetermined time frame.
4. The thermometer of claim 3 wherein the processor samples the temperature signal around twenty-one times over a time frame of approximately two seconds to determine the average value, the first derivative, and the second derivative of the signal.
5. The thermometer of claim 3 wherein the processor continuously samples the signal after acquiring an initial predetermined number of samples and continuously recalculates the temperature estimate based on the last predetermined number of samples acquired as each new sample is acquired.
6. The thermometer of claim 5 wherein the thermometer displays on the display a final temperature estimate calculated by the processor after the sensor has been in contact with the object for a predetermined length of time.
7. The thermometer of claim 5 wherein the thermometer displays on the display a final temperature estimate calculated by the processor only if the last value of the first derivative calculated by the processor lies in a predetermined range of values.
8. The thermometer of claim 5 wherein the thermometer displays on the display a final temperature estimate calculated by the processor only if the last value of the second derivative calculated by the processor lies in a predetermined range of values.
9. The thermometer of claim 5 wherein the thermometer displays on the display a final temperature estimate only if the maximum difference between any two of a predetermined number of the last temperature estimates calculated by the processor is less than a predetermined value.
10. The thermometer of claim 5 wherein the final temperature estimate displayed by the thermometer is equal to the average of a selected number of the last temperature estimates calculated by the processor.
11. The thermometer of claim 1 wherein the processor comprises a finite impulse response filter configured to calculate the temperature estimate.
12. The thermometer of claim 11 wherein the processor comprises:
a first finite impulse response filter configured to calculate the average value based on the last predetermined number of samples acquired by the processor;
a second finite impulse response filter configured to calculate the first derivative based on the last predetermined number of samples acquired by the processor; and a third finite impulse response filter configured to calculate the second derivative based on the last predetermined number of samples acquired by the processor.
a first finite impulse response filter configured to calculate the average value based on the last predetermined number of samples acquired by the processor;
a second finite impulse response filter configured to calculate the first derivative based on the last predetermined number of samples acquired by the processor; and a third finite impulse response filter configured to calculate the second derivative based on the last predetermined number of samples acquired by the processor.
13. The thermometer of claim 2 wherein the processor further adds an ambient temperature offset coefficient to the sum of the weighted average value, first derivative, and second derivative to calculate the temperature estimate.
14. The thermometer of claim 13 wherein:
the sensor further provides an initial signal corresponding to the ambient temperature; and the processor further determines the square of the ambient temperature, applies a separate weighting factor to each of the ambient temperature and the square of the ambient temperature, and combines the weighted value of the ambient temperature with the weighted square of the value of the ambient temperature to calculate the ambient temperature offset coefficient.
the sensor further provides an initial signal corresponding to the ambient temperature; and the processor further determines the square of the ambient temperature, applies a separate weighting factor to each of the ambient temperature and the square of the ambient temperature, and combines the weighted value of the ambient temperature with the weighted square of the value of the ambient temperature to calculate the ambient temperature offset coefficient.
15. A method for measuring the temperature of an object, comprising the steps of:
sensing the temperature of the object;
providing a time varying temperature signal responsive to sensing the temperature of the object;
sampling the temperature signal a predetermined number of times;
determining the average value of the temperature signal based upon the predetermined number of samples acquired;
determining the first derivative of the temperature signal based upon the predetermined number of samples acquired;
determining the second derivative of the temperature signal based upon the predetermined number of samples acquired; and calculating an estimate of the temperature of the object by combining the average value, the first derivative, and the second derivative.
sensing the temperature of the object;
providing a time varying temperature signal responsive to sensing the temperature of the object;
sampling the temperature signal a predetermined number of times;
determining the average value of the temperature signal based upon the predetermined number of samples acquired;
determining the first derivative of the temperature signal based upon the predetermined number of samples acquired;
determining the second derivative of the temperature signal based upon the predetermined number of samples acquired; and calculating an estimate of the temperature of the object by combining the average value, the first derivative, and the second derivative.
16. The method of claim 15 comprising the further steps of:
applying a first weighting factor to the average value;
applying a second weighting factor to the first derivative; and applying a third weighting factor to the second derivative.
applying a first weighting factor to the average value;
applying a second weighting factor to the first derivative; and applying a third weighting factor to the second derivative.
17. The method of claim 15 wherein the step of sampling the temperature signal a predetermined number of times comprises sampling the temperature signal around twenty-one times over a time frame of approximately two seconds.
18. The method of claim 15 comprising the further steps of:
repeatedly sampling the temperature signal; and repeatedly recalculating the temperature estimate based on the last predetermined number of samples obtained as each new sample is acquired.
repeatedly sampling the temperature signal; and repeatedly recalculating the temperature estimate based on the last predetermined number of samples obtained as each new sample is acquired.
19. The method of claim 15 comprising the further step of displaying the temperature estimate on a display.
20. The method of claim 19 wherein the step of displaying the temperature estimate is performed after the temperature of the object has been sensed for a predetermined length of time.
21. The method of claim 19 wherein the step of displaying the temperature estimate is performed only when the last value of the first derivative calculated by the processor lies in a predetermined range of values.
22. The method of claim 19 wherein the step of displaying the temperature estimate is performed only when the last value of the second derivative calculated by the processor lies in a predetermined range of values.
23. The method of claim 19 wherein the step of displaying the temperature estimate is performed only when the maximum difference between selected temperature estimates calculated by the processor is less than a predetermined value.
24. The method of claim 19 wherein the step of calculating an estimate of the temperature of the object comprises the further step of:
averaging a predetermined number of the temperature estimates calculated by the processor to calculate a final temperature estimate; and wherein the step of displaying the temperature estimate is comprised of displaying the final temperature estimate.
averaging a predetermined number of the temperature estimates calculated by the processor to calculate a final temperature estimate; and wherein the step of displaying the temperature estimate is comprised of displaying the final temperature estimate.
25. The method of claim 15 further comprising the step of providing the sampled temperature signals to at least one FIR filter and thereby performing the steps of determining the average value of the temperature signal, determining the first derivative of the temperature signal, and determining the second derivative of the temperature signal by the FIR filter.
26. The method of claim 25 wherein the step of providing the sampled temperature signal to at least one FIR filter comprises the steps of:
providing the sampled temperature signals to a first FIR for calculating the average value based on a predetermined number of sample values acquired;
providing the sampled temperature signals to a second finite impulse response filter for calculating the first derivative based on a predetermined number of sample values acquired; and providing the sampled temperature signals to a third finite impulse response filter for calculating the second derivative based on a predetermined number of sample values acquired.
providing the sampled temperature signals to a first FIR for calculating the average value based on a predetermined number of sample values acquired;
providing the sampled temperature signals to a second finite impulse response filter for calculating the first derivative based on a predetermined number of sample values acquired; and providing the sampled temperature signals to a third finite impulse response filter for calculating the second derivative based on a predetermined number of sample values acquired.
27. The method of claim 25 wherein:
the step of providing an FIR filter comprises applying weights to the average value, the first derivative, and the second derivative based on a predetermined number of sample values acquired.
the step of providing an FIR filter comprises applying weights to the average value, the first derivative, and the second derivative based on a predetermined number of sample values acquired.
28. The method of claim 27 further comprising the step of combining the weighted average value, the weighted first derivative, and the weighted second derivative to determine the estimated temperature of the object.
29. The method of claim 16 comprising the further steps of:
sensing the ambient temperature;
determining the square of the value of the ambient temperature;
applying a fourth weighting factor to the ambient temperature;
applying a fifth weighting factor to the square of the ambient temperature;
and wherein the step of calculating the estimate of the temperature of the object comprises combining the weighted average value, the weighted first derivative, and the weighted second derivative with the weighted ambient temperature and the weighted square of the ambient temperature.
sensing the ambient temperature;
determining the square of the value of the ambient temperature;
applying a fourth weighting factor to the ambient temperature;
applying a fifth weighting factor to the square of the ambient temperature;
and wherein the step of calculating the estimate of the temperature of the object comprises combining the weighted average value, the weighted first derivative, and the weighted second derivative with the weighted ambient temperature and the weighted square of the ambient temperature.
30. A thermometer for measuring the temperature of a biological subject, comprising:
a sensor which, when positioned to sense the temperature of the subject, provides a time varying temperature signal in response to the temperature of the subject;
a processor comprising a finite impulse response filter connected so as to sample the temperature signal a predetermined number of times, to determine the average value, the first derivative, and the second derivative of the temperature signal based upon the predetermined number of samples acquired, the processor also configured to combine the average value, first derivative, and second derivative to calculate an estimate of the temperature of the subject and provide an estimated final temperature signal; and a display connected with the processor to receive and display the estimated final temperature signal.
a sensor which, when positioned to sense the temperature of the subject, provides a time varying temperature signal in response to the temperature of the subject;
a processor comprising a finite impulse response filter connected so as to sample the temperature signal a predetermined number of times, to determine the average value, the first derivative, and the second derivative of the temperature signal based upon the predetermined number of samples acquired, the processor also configured to combine the average value, first derivative, and second derivative to calculate an estimate of the temperature of the subject and provide an estimated final temperature signal; and a display connected with the processor to receive and display the estimated final temperature signal.
31. The thermometer of claim 30 wherein the processor comprises:
a first finite impulse response filter configured to calculate the average value based on the last predetermined number of samples acquired by the processor;
a second finite impulse response filter configured to calculate the first derivative based on the last predetermined number of samples acquired by the processor; and a third finite impulse response filter configured to calculate the second derivative based on the last predetermined number of samples acquired by the processor.
a first finite impulse response filter configured to calculate the average value based on the last predetermined number of samples acquired by the processor;
a second finite impulse response filter configured to calculate the first derivative based on the last predetermined number of samples acquired by the processor; and a third finite impulse response filter configured to calculate the second derivative based on the last predetermined number of samples acquired by the processor.
32. The thermometer of claim 30 wherein the thermometer displays on the display a final temperature estimate calculated by the processor after the sensor has been in contact with the object for a predetermined length of time.
33. The thermometer of claim 30 wherein the thermometer displays on the display a final temperature estimate calculated by the processor only if the last value of the first derivative calculated by the processor lies in a predetermined range of values.
34. The thermometer of claim 30 wherein the thermometer displays on the display a final temperature estimate calculated by the processor only if the last value of the second derivative calculated by the processor lies in a predetermined range of values.
35. The thermometer of claim 30 wherein the thermometer displays on the display a final temperature estimate only if the maximum difference between any two of a predetermined number of the last temperature estimates calculated by the processor is less than a predetermined value.
36. The thermometer of claim 30 wherein the final temperature estimate displayed by the thermometer is equal to the average of a selected number of the last temperature estimates calculated by the processor.
37. The thermometer of claim 30 wherein the processor further adds an ambient temperature offset coefficient to the sum of the weighted average value, first derivative, and second derivative to calculate the temperature estimate.
38. The thermometer of claim 37 wherein:
the sensor further provides an initial signal corresponding to the ambient temperature; and the processor further determines the square of the ambient temperature, applies a separate weighting factor to each of the ambient temperature and the square of the ambient temperature, and combines the weighted value of the ambient temperature with the weighted square of the value of the ambient temperature to calculate the ambient temperature offset coefficient.
the sensor further provides an initial signal corresponding to the ambient temperature; and the processor further determines the square of the ambient temperature, applies a separate weighting factor to each of the ambient temperature and the square of the ambient temperature, and combines the weighted value of the ambient temperature with the weighted square of the value of the ambient temperature to calculate the ambient temperature offset coefficient.
39. A thermometer for measuring the temperature of a biological subject, comprising:
a sensor which, when positioned to sense the temperature of the subject, provides a time varying temperature signal in response to the temperature of the subject;
a processor comprising a finite impulse response filter connected so as to sample the temperature signal a plurality of times to calculate an estimate of the temperature of the subject and provide an estimated final temperature signal;
and a display connected with the processor to receive and display the estimated final temperature signal.
a sensor which, when positioned to sense the temperature of the subject, provides a time varying temperature signal in response to the temperature of the subject;
a processor comprising a finite impulse response filter connected so as to sample the temperature signal a plurality of times to calculate an estimate of the temperature of the subject and provide an estimated final temperature signal;
and a display connected with the processor to receive and display the estimated final temperature signal.
40. The thermometer of claim 39 wherein the finite impulse response filter takes a linear combination of a plurality of samples in calculating the estimate of the temperature of the subject.
41. The thermometer of claim 39 wherein the processor adds an offset coefficient based on ambient temperature to the estimate of the temperature provided by the finite impulse response filter in providing an estimated final temperature signal.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US09/313,911 US6270252B1 (en) | 1999-05-18 | 1999-05-18 | Predictive temperature measurement system |
| US09/313,911 | 1999-05-18 | ||
| PCT/US2000/013496 WO2000070316A1 (en) | 1999-05-18 | 2000-05-17 | Predictive temperature measurement system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2373366A1 true CA2373366A1 (en) | 2000-11-23 |
| CA2373366C CA2373366C (en) | 2009-12-01 |
Family
ID=23217707
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002373366A Expired - Fee Related CA2373366C (en) | 1999-05-18 | 2000-05-17 | Predictive temperature measurement system |
Country Status (10)
| Country | Link |
|---|---|
| US (2) | US6270252B1 (en) |
| EP (1) | EP1183508B1 (en) |
| JP (3) | JP2002544512A (en) |
| AT (1) | ATE345491T1 (en) |
| AU (1) | AU781183B2 (en) |
| CA (1) | CA2373366C (en) |
| DE (1) | DE60031847T2 (en) |
| ES (1) | ES2275515T3 (en) |
| HK (1) | HK1044371B (en) |
| WO (1) | WO2000070316A1 (en) |
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-
1999
- 1999-05-18 US US09/313,911 patent/US6270252B1/en not_active Expired - Lifetime
-
2000
- 2000-05-17 JP JP2000618700A patent/JP2002544512A/en active Pending
- 2000-05-17 WO PCT/US2000/013496 patent/WO2000070316A1/en active IP Right Grant
- 2000-05-17 AU AU52725/00A patent/AU781183B2/en not_active Ceased
- 2000-05-17 AT AT00937576T patent/ATE345491T1/en not_active IP Right Cessation
- 2000-05-17 ES ES00937576T patent/ES2275515T3/en not_active Expired - Lifetime
- 2000-05-17 CA CA002373366A patent/CA2373366C/en not_active Expired - Fee Related
- 2000-05-17 EP EP00937576A patent/EP1183508B1/en not_active Expired - Lifetime
- 2000-05-17 DE DE60031847T patent/DE60031847T2/en not_active Expired - Lifetime
-
2001
- 2001-03-14 US US09/809,591 patent/US6698921B2/en not_active Expired - Lifetime
-
2002
- 2002-08-14 HK HK02105961.2A patent/HK1044371B/en not_active IP Right Cessation
-
2011
- 2011-01-17 JP JP2011006924A patent/JP2011075580A/en not_active Ceased
- 2011-06-09 JP JP2011128921A patent/JP2011203269A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| US6698921B2 (en) | 2004-03-02 |
| DE60031847T2 (en) | 2007-03-01 |
| WO2000070316A1 (en) | 2000-11-23 |
| JP2011203269A (en) | 2011-10-13 |
| CA2373366C (en) | 2009-12-01 |
| JP2002544512A (en) | 2002-12-24 |
| ATE345491T1 (en) | 2006-12-15 |
| EP1183508B1 (en) | 2006-11-15 |
| HK1044371A1 (en) | 2002-10-18 |
| DE60031847D1 (en) | 2006-12-28 |
| EP1183508A1 (en) | 2002-03-06 |
| US6270252B1 (en) | 2001-08-07 |
| AU5272500A (en) | 2000-12-05 |
| ES2275515T3 (en) | 2007-06-16 |
| US20020003832A1 (en) | 2002-01-10 |
| JP2011075580A (en) | 2011-04-14 |
| AU781183B2 (en) | 2005-05-12 |
| HK1044371B (en) | 2007-08-17 |
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| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20170517 |