System and method of compensation for device mounting and thermal transfer error

• US 7,447,607 B2
• Filed: 08/31/2004
• Issued: 11/04/2008
• Est. Priority Date: 08/31/2004
• Status: Active Grant

• Current Assignee: Watlow Electric Manufacturing Company
• Original Assignee: Watlow Electric Manufacturing Company
• Inventors: Culbertson, David P., Schuh, William C.
• Primary Examiner(s): Barlow, Jr.; John E.
• Assistant Examiner(s): Cherry; Stephen J
• Application Number:
  US10/930,223
• Publication Number:
  US 20060045164A1
• Time in Patent Office: 1,526 Days
• Field of Search: 702/99, 702/130, 374/133, 374/31
• US Class Current: 702/130
• CPC Class Codes: G01K 15/00 Testing or calibrating of thermometers
• CPC Class Codes: G01K 7/42 Circuits effecting compensation of thermal inertia; Circuits for predicting the stationary value of a temperature

Abstract

A thermal device system including a device for measuring a temperature within a user environment and providing a device output signal indicative of the device measured temperature. The system also includes a thermal transfer indicia associated with the device. The thermal indicia provide thermal transfer parameters for compensating the device measured temperature as a function of the thermal transfer between the device and the user environment. The thermal transfer parameters are associated with predetermined thermal transfer information for characterizing a transfer of thermal energy between the device and the user environment. Also a method of compensating a temperature measurement of a thermal device in a user environment as a function of a thermal transfer of the thermal device in a temperature measurement system.

Claims

1. A thermal sensor system, comprising:

a sensor for measuring a temperature within a user environment and providing a sensor signal indicative of the sensor measured temperature; and

a thermal transfer indicia associated with the sensor for providing thermal transfer parameters for compensating the sensor measured temperature as a function of the thermal transfer between the sensor and the user environment, said thermal transfer parameters being associated with predetermined thermal transfer information for characterizing a transfer of thermal energy between the sensor and the user environment, wherein the thermal transfer indicia compensates for measurement errors in the sensor signal based on one of a plurality of predetermined specific thermal environments and one of a plurality of predetermined sensor specific thermal errors associated with the sensor.

2. The system of claim 1 wherein the thermal transfer parameters are at least one of one stored by the thermal transfer indicia and one referenced by the thermal transfer indicia.

3. The system of claim 1, further comprising:

a thermal transfer model associated with the sensor for generating thermal compensation information for compensating the sensor measured temperature as indicated by the sensor signal as a function of the thermal transfer parameters.

4. The system of claim 3 wherein the thermal transfer model defines a thermal relationship between the sensor measured temperature and a thermal transfer characteristic of the user environment, said thermal relationship being defined at least in part from user information.

5. The system of claim 4 wherein the user information includes information received from a selected source from the group consisting of a list, a menu in a computer program, a computer readable media, and an online Internet program.

6. The system of claim 3 wherein the thermal transfer model defines a thermal transfer relationship of at least one of a conductive thermal relationship, a convective thermal relationship, and a radiative thermal relationship.

7. The system of claim 3 wherein the thermal transfer model defines a thermal transfer relationship of a conductive thermal model, the conductive thermal model including at least one of a measurement element to sensor environment ambient heat transfer conductor Ga, a sheath to measurement element heat transfer conductor Gs1, and a thermal contact resistance heat transfer conductor Gc.

8. The system of claim 3 wherein the thermal transfer model defines a thermal transfer relationship of a convective thermal model, the convective thermal model including at least one of a measurement element to sensor environment ambient heat transfer conductor Ga, a sheath to measurement element heat transfer conductor Gs1, and a process to sheath heat transfer conductor Gs2.

9. The system of claim 3 wherein the thermal transfer model defines a thermal transfer relationship of a radiative thermal model, the radiative thermal model including at least one of a measurement element to sensor environment ambient heat transfer conductor Ga, a sheath to measurement element heat transfer conductor Gs1, a process to sheath heat transfer conductor Gs2, and a radiative source to sheath heat transfer conductor Gs.

10. The system of claim 3 wherein the thermal transfer model comprises a network of heat transfer conductors representing the heat transfer between the sensor and at least one heat transfer type selected from the group consisting of a convective heat transfer, a conductive heat transfer, and a radiative heat transfer.

11. The system of claim 1, further comprising:

a thermal transfer compensation device for receiving the sensor signal and the thermal transfer parameters from the thermal transfer indicia, the thermal transfer compensation device generating a compensated measured temperature as a function of the thermal transfer model.

12. The system of claim 1, further comprising:

a thermal transfer compensation device for receiving the thermal transfer parameters from the thermal transfer indicia and the sensor signal, the thermal transfer compensation device generating a compensated measured temperature as a function of a thermal transfer characteristic of the user environment.

13. The system of claim 12 wherein the thermal transfer compensation device includes:

an input module for receiving the sensor signal from the sensor and the thermal transfer parameters from the thermal transfer indicia associated with the sensor;

a measurement module for receiving the sensor signal from the sensor and for generating measurement data as a function of the received sensor signal;

a processor module for determining the compensated measured temperature as a function of the measurement data and the thermal transfer parameters associated with the sensor;

a memory for storing the measurement data and the thermal transfer parameters; and

a communication module for generating a compensated sensor temperature signal indicative of the compensated measured temperature.

14. The system of claim 1 wherein the sensor includes a thermocouple.

15. The system of claim 1 wherein the sensor comprises at least one of a resistance temperature detector, a thermistor, a diode, and a transistor.

16. The system of claim 1 wherein the thermal transfer indicia is associated with an indicia storage system selected from the group consisting of an EPROM, an EEPROM, a barcode, an RFID tag, a virtual storage location on a network, a memory device, a computer readable medium, a computer disk, and a storage device operable to communicate information of the sensor.

17. The system of claim 1 wherein the thermal transfer indicia provides the thermal transfer parameters for compensating the sensor signal to provide a thermal transfer compensated measured temperature.

18. The system of claim 1 wherein the thermal transfer parameters are associated with predetermined information provided by a manufacturer of the sensor.

19. A temperature measurement error compensation system comprising:

a temperature sensor for use within a sensor environment of a user application, said sensor providing a sensor signal;

a thermal transfer indicia associated with the sensor for providing thermal transfer parameters associated with a thermal transfer characteristic between the sensor and the sensor environment within the user application, wherein the thermal transfer indicia compensates for measurement errors in the sensor signal based on one of a plurality of predetermined specific thermal environments and one of a plurality of predetermined sensor specific thermal errors associated with the sensor; and

a communication interface for providing the thermal transfer parameters to a temperature measurement system operably coupled to the communication interface, said temperature measurement system configured to determine a compensated sensor signal as a function of the thermal transfer parameters.

20. The system of claim 19 wherein the thermal transfer parameters are at least one of one stored by the thermal transfer indicia and one referenced by the thermal transfer indicia.

21. The system of claim 19, further comprising:

a thermal transfer model associated with the sensor, wherein the sensor environment is characterized by the thermal transfer model to identify the thermal transfer between the sensor and the sensor environment.

22. The system of claim 21 wherein the thermal transfer model includes:

a user input for providing the thermal transfer model information about the sensor environment and the user application, said information including at least one of a sensor environment input and a user application input;

a thermal profile input associated with the sensor environment for providing a sensor thermal transfer model based on information associated with the sensor, the information including at least one of a thermal profile measurement and a referenced thermal profile measurement of the sensor; and

a thermal transfer algorithm for analyzing at least one of the sensor environment and user application inputs and analyzing the thermal profile input, the thermal transfer algorithm providing a thermal transfer function, wherein the thermal transfer function represents an analysis of the thermal model based on the at least one of the sensor environment input and user application input and based on the thermal profile input.

23. The system of claim 22 wherein the thermal transfer function defines a relationship between the measured temperature and the thermal transfer associated with the sensor environment derived from the thermal modeling of the sensor.

24. The system of claim 22 wherein the user input receives the information from a source selected from the group consisting of a list, a menu in a computer program, a computer readable media, and an online Internet program associated with the sensor.

25. The system of claim 22 wherein the thermal transfer function comprises:

a function describing the relationship between the measured temperature and the heat transfer between the sensor and the sensor environment surrounding the sensor; and

a function describing the relationship between the measured temperature and the heat transfer associated with a manufacturer defined mounting configuration of the sensor and the sensor environment.

26. The system of claim 22 wherein the thermal transfer function describes a thermal transfer relationship of a network of heat transfer conductors, the network of heat transfer conductors including at least one conductor selected from the group consisting of:

a measurement element to sensor environment ambient heat transfer conductor Ga indicative of a thermal resistance between a measurement element of the sensor and a sensor environment ambient;

a sheath to measurement element heat transfer conductor Gs1 indicative of a thermal resistance between the measurement element of the sensor and an inner sheath boundary of the sensor;

a process to sheath heat transfer conductor Gs2 indicative of a thermal resistance between an outer sheath boundary of the sensor and a sensor environment convective process;

a thermal contact resistance heat transfer conductor Gc indicative of a thermal contact resistance between the outer sheath boundary of the sensor and the sensor environment conductive process; and

a radiative source to sheath heat transfer conductor Gs indicative of a thermal resistance between the outer sheath boundary of the sensor and the sensor environment radiative process.

27. The system of claim 22 wherein the thermal transfer function defines a thermal transfer relationship of at least one of a conductive thermal relationship, a convective thermal relationship, and a radiative thermal relationship.

28. The system of claim 22 wherein the thermal transfer function defines a thermal transfer relationship of a conductive thermal model, the conductive thermal model including at least one of a measurement element to sensor environment ambient heat transfer conductor Ga, a sheath to measurement element heat transfer conductor Gs1, and a thermal contact resistance heat transfer conductor Gc.

29. The system of claim 22 wherein the thermal transfer function defines a thermal transfer relationship of a convective thermal model, the convective thermal model including at least one of a measurement element to sensor environment ambient heat transfer conductor Ga, a sheath to measurement element heat transfer conductor Gs1, and a process to sheath heat transfer conductor Gs2.

30. The system of claim 22 wherein the thermal transfer function defines a thermal transfer relationship of a radiative thermal model, the radiative thermal model including at least one of a measurement element to sensor environment ambient heat transfer conductor Ga, a sheath to measurement element heat transfer conductor Gs1, a process to sheath heat transfer conductor Gs2, and a radiative source to sheath heat transfer conductor Gs.

31. The system of claim 22 wherein the thermal transfer model includes a network of heat transfer conductors representing a heat transfer between the sensor and at least one heat transfer type selected from the group consisting of a convective, a conductive, and a radiative heat transfer.

32. The system of claim 19, further comprising:

a thermal transfer compensation device for receiving the thermal transfer parameters of the thermal transfer function from the thermal transfer indicia and for adjusting the sensor signal as a function of the thermal transfer function.

33. The system of claim 19, further comprising:

a thermal transfer compensation device for retrieving the thermal transfer parameters from the thermal transfer indicia and for adjusting the sensor measured temperature as a function of the thermal transfer parameters to determine a compensated measured temperature.

34. The system of claim 33 wherein the thermal transfer compensation device includes:

an input module for receiving the sensor signal from the sensor and the thermal transfer parameters from the thermal transfer indicia associated with the sensor;

a measurement module for receiving the sensor signal from the sensor and for generating measurement data as a function of the received sensor signal;

a processor module for determining the compensated measured temperature as a function of the measurement data and the thermal transfer parameters associated with the sensor;

a memory for storing the measurement data and the thermal transfer parameters; and

a communication module for generating a compensated sensor temperature signal indicative of the compensated measured temperature.

35. The system of claim 19 wherein the sensor includes a thermocouple.

36. The system of claim 19 wherein the sensor is selected from the group consisting of a resistance temperature detector, a thermistor, a diode, and a transistor.

37. The system of claim 19 wherein the thermal transfer indicia is associated with an indicia storage system selected from the group consisting of an EPROM, an EEPROM, a barcode, an RFID tag, a virtual storage location on a network, a memory device, a computer readable medium, a computer disk, and a storage device operable to communicate information of the sensor.

38. The system of claim 19 wherein the thermal transfer indicia provides the thermal transfer parameters for compensating the sensor signal to provide a thermal transfer compensated measured temperature.

39. The system of claim 19 wherein at least one of the thermal transfer parameters associated with the thermal transfer function are a function of predetermined information selected from the group consisting of the sensor environment, the user application, sensor manufacturer data, and sensor mounting manufacturer data.

40. A system for compensating thermal transfer between a thermal device and a user environment surrounding the device and within a user application, comprising:

a thermal device for positioning in the user environment providing a thermal device signal;

a thermal transfer indicia associated with the thermal device for providing thermal transfer parameters of a thermal transfer function at least partially describing the relationship between a temperature of the thermal device and a thermal transfer between the thermal device and the user environment, wherein the thermal transfer indicia compensates for measurement errors in the device signal based on one of a plurality of predetermined specific thermal environments and one of a plurality of predetermined sensor specific thermal errors associated with the sensor; and

a temperature measurement compensation device for receiving the thermal transfer parameters and for generating a compensated measured temperature as a function of the thermal transfer between the user environment and the thermal device.

41. The system of claim 40 wherein the temperature measurement compensation device include a compensation device user input module for receiving user application and environment data from a user and wherein the temperature measurement compensation device generates a compensated measured temperature as a function of the received user application and environment data.

42. The system of claim 40 wherein the thermal transfer parameters are at least one of one stored by the thermal transfer indicia and one referenced by the thermal transfer indicia.

43. The system of claim 40 wherein the thermal device comprises a thermocouple.

44. The system of claim 40 wherein the thermal device is selected from the group consisting of a resistance temperature detector, a thermistor, a diode, and a transistor.

45. The system of claim 40 wherein the thermal transfer indicia is associated with an indicia storage system selected from the group consisting of an EPROM, an EEPROM, a barcode, an RFID tag, a virtual storage location on a network, a memory device, a computer readable medium, a computer disk, and a storage device operable to communicate information of the device.

46. The system of claim 40 wherein the temperature measurement error compensation device includes:

an input module for receiving the thermal device signal from the thermal device and the thermal transfer parameters from the thermal transfer indicia associated with the thermal device;

a measurement module for receiving the thermal device signal from the thermal device and for generating measurement data as a function of the received thermal device signal;

a processor module for determining the compensated measured temperature as a function of the measurement data and the thermal transfer parameters associated with the thermal device;

a memory for storing the measurement data and the thermal transfer parameters; and

a communication module for generating a compensated device temperature signal indicative of the compensated measured temperature.

47. The measurement system of claim 40 wherein the thermal transfer parameters associated with the thermal transfer function are stored by the thermal transfer indicia as a function of predetermined information selected from the group consisting of the user environment, the user application, sensor specific data, and a device manufacturer positioning data.