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Correction method for absolute error of temperature measuring instrument

A temperature measuring instrument and absolute error technology, which is applied in the field of correction of the absolute error of the temperature measuring instrument, can solve the problems of reducing the real-time performance of the temperature measurement value, slow data processing speed, and measuring wire error, so as to improve the measurement accuracy and reduce the hardware cost , the effect of meeting the precision requirements

Active Publication Date: 2020-07-10
SHANGHAI MOTOR SYST ENERGY SAVING ENG TECH RES CENT +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. Errors caused by the temperature measurement system: such as the error of the thermocouple itself, the measurement error of the temperature measuring instrument, the error caused by the measuring wire, etc.
[0006] 2. Errors caused by external environmental influences: Factors such as temperature, pressure, humidity, magnetic field, vibration, etc. have sufficiently significant changes in a short period of time
At the same time, the calculation efficiency in real-time measurement is low, and the data processing speed is slow, which reduces the real-time performance of temperature measurement values.

Method used

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  • Correction method for absolute error of temperature measuring instrument
  • Correction method for absolute error of temperature measuring instrument

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0120] The thermocouple type is T-type (and the cold junction compensation temperature is 0°C), the measuring range is -170°C to 390°C, and the accuracy requirement is ±0.5°C.

[0121] In the factory calibration state of the temperature measuring instrument:

[0122] S1. Set the factory calibration parameters.

[0123] Set the type of thermocouple as T, the lower limit of the range range d L =-170 and upper limit d H =390, precision requirement value ε=0.5.

[0124] S2. Collecting and processing experimental point data.

[0125] Connect and adjust the signal generating device, and take 10 experimental points within the entire range range -170°C to 390°C (corresponding to -5.070mV to 20.255mV).

[0126] S2.1, sequentially and simultaneously collect the voltage true value U and voltage measurement value U of each experimental point X , the results are shown in Table 1.

[0127] S2.2. Calculate the true temperature T and measured temperature T of each experimental point X ...

Embodiment 2

[0175] The thermocouple type is T-type (and the cold junction compensation temperature is 0°C), the measuring range ranges from -170°C to 390°C, and the accuracy requirement is ±0.1°C.

[0176] In the factory calibration state of the temperature measuring instrument:

[0177] S1, try to reselect the threshold constant ΔL=0.4783 (i.e. Δl in Table 2 8 value) to meet the accuracy requirements.

[0178] S2. Calculate the fitting function expression ΔT when ΔL=0.4783 X =F(T).

[0179] (1) Combining ΔL=0.4783 and Δl in Table 2 i The value of Δl can be known 3 ,Δl 4 ,Δl 6 ,Δl 7 ,Δl 8 Satisfy Δl i ≥ΔL. Now by [m1]=3, [m2]=4, [m3]=6, [m4]=7, [m5]=8, get [m1]-1=2, [m2]-1=3, [m3]-1=5, [m4]-1=6, [m5]-1=7, so point row P 1 ,P 2 ,P 3 ,P 5 ,P 6 ,P 7 ,P 10 Contains the first and last fit points of all line segments.

[0180] (2) Using the least squares method, from the point P 1 ,P 2 Fit the first piecewise straight line equation, from point P 2 ,P 3 Fit the second piec...

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Abstract

The invention provides a correction method for an absolute error of a temperature measuring instrument. The method is characterized in that a piecewise linear algorithm based on a least square methodis adopted to search a fitting function; the whole measuring range interval is divided into a plurality of intervals; a linear equation of the temperature absolute error value delta TX relative to thetemperature true value T is searched in each interval, a plurality of piecewise linear equations are obtained, and the piecewise linear equations serve as an expression of a fitting function delta TX= F (T) and are used for describing the characteristics of the temperature absolute error value delta TX. The hardware cost of the temperature measuring instrument can be reduced while the measuringprecision of the temperature measuring instrument is improved.

Description

technical field [0001] The invention relates to a method for correcting the absolute error of a temperature measuring instrument, belonging to the technical field of temperature measurement. Background technique [0002] In many areas of production, it is necessary to measure temperature parameters. It is a very common method to measure the temperature value of the target by using a temperature measurement system composed of a thermocouple and a temperature measuring instrument. [0003] combine figure 1 , the basic principle of the above-mentioned temperature measurement system is: the analog quantity input by the thermocouple is processed by the analog-to-digital converter of the temperature measuring instrument and then converted into a digital quantity. After the processor CPU reads the digital quantity, it first performs linear conversion to obtain the corresponding voltage measurement value U X , and then convert the temperature to get the temperature measurement va...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K7/10G01K15/00
CPCG01K7/10G01K15/005
Inventor 夏勇琳张耘嘉刘琪石浩童陟嵩
Owner SHANGHAI MOTOR SYST ENERGY SAVING ENG TECH RES CENT
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