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Temperature measurement method without temperature compensation thermocouple

A technology of temperature compensation and thermocouples, which is applied to thermometers, thermometers with directly heat-sensitive electric/magnetic elements, measuring devices, etc., can solve the problem that only partial compensation can be obtained

Active Publication Date: 2018-03-16
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In fact, because the thermoelectric characteristics of the thermocouple and the output characteristics of the compensation bridge are not exactly the same, within the compensation range, it can only be fully compensated at certain temperatures, and can only be partially compensated at other temperatures.

Method used

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  • Temperature measurement method without temperature compensation thermocouple
  • Temperature measurement method without temperature compensation thermocouple
  • Temperature measurement method without temperature compensation thermocouple

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0058] (1) Establish the temperature-thermoelectric potential index tables of two thermocouples with different thermoelectric properties at the same fixed free end temperature;

[0059] (2) List a combination of working end temperature value-free end temperature value, and find out the thermoelectric potential values ​​output by the corresponding two thermocouples according to the two graduation tables obtained in step (1);

[0060] (3) Repeat step (2) until all required combinations of working end temperature value-free end temperature value and corresponding two thermocouple output thermoelectric potential values ​​are listed and organized into a table;

[0061] (4) Rewrite the table obtained in step (3) into the double thermoelectric potential value and its corresponding two-dimensional graduation table of the working end temperature at the same temperature and the double thermoelectric potential and its corresponding two-dimensional graduation table of the free end temperat...

specific Embodiment approach 2

[0069] (1) Take the temperature as the horizontal or vertical axis, and take the thermoelectric potential as the vertical or horizontal axis to draw the temperature-thermoelectric potential fitting curves of two thermocouples with different thermoelectric properties at the same fixed free end temperature in the same coordinate system That is, the temperature-thermoelectric potential hyperbola f1, f2 such as Figure 5 shown;

[0070] (2) Place the two working ends of the two thermocouples at the same temperature measuring point;

[0071] (3) Place the free ends of the two thermocouples at the same ambient temperature point;

[0072] (4) Measure and read out the respective thermoelectric potential values ​​e1 and e2 of the two thermocouples;

[0073] (5) to image 3 The origin in is the starting point, that is, let t1=0 and read the value of t2 on the f1 curve at the vertical axis e1;

[0074] (6) Read the corresponding thermoelectric potential e2* value on the f2 curve acco...

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Abstract

The non-temperature compensation thermocouple temperature measurement method selects two thermocouples with different thermoelectric properties, uses the thermoelectric potential-temperature index of the two thermocouples, and establishes the same temperature at both ends of the two thermocouples, that is, the two working ends are at the same temperature and The two free ends are also the same thermoelectric potential—temperature two-dimensional graduation table or temperature-thermoelectric potential hyperbola; place the two working ends of the two thermocouples at the same temperature measuring point or make them have the same temperature at the measuring point, and at the same time Make the two free ends of the two thermocouples always have the same temperature; measure the two thermoelectric potential values ​​output by the two thermocouples, according to the two thermoelectric potential values ​​from the thermoelectric potential-temperature two-dimensional indexing table or temperature-thermoelectric potential The hyperbola finds the corresponding working end and free end temperatures; the method of the invention can simultaneously measure the working end and free end temperatures of two thermocouples with the same working end temperature and the same free end temperature without temperature compensation.

Description

technical field [0001] The invention belongs to the technical field of thermocouple temperature measurement, and in particular relates to a thermocouple temperature measurement method without temperature compensation. Background technique [0002] It is known from the principle of thermocouple temperature measurement that only when the temperature of the free end of the thermocouple remains constant, the thermoelectric potential is a single-valued function of the measured temperature. The choice of temperature at the free end and the size of the fluctuation directly affect the accuracy and reliability of temperature measurement, so measures must be taken to deal with the temperature at the free end. At present, there are mainly the following methods to deal with the temperature of the free end: [0003] 1. Fixed-point method [0004] The fixed-point method is also called the constant temperature method, that is, the free end is placed in a thermostat to maintain it at a co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K7/10
CPCG01K7/10
Inventor 周延
Owner XI AN JIAOTONG UNIV