Compensation process for detecting temperature for temperature sensor

A temperature sensor and compensation method technology, applied in thermometer testing/calibration, thermometers, thermometers using electric/magnetic elements that are directly sensitive to heat, etc., can solve the problem of inability to realize automation, informatization, low efficiency, and inability to realize process control And other issues

Inactive Publication Date: 2009-05-06
DALIAN UNIV OF TECH
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Problems solved by technology

The disadvantages of manual detection instruments using the national standard No. 1 mercury thermometer are: low efficiency, inability to realize process control, especially inability to realize automation and informatization
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  • Compensation process for detecting temperature for temperature sensor
  • Compensation process for detecting temperature for temperature sensor
  • Compensation process for detecting temperature for temperature sensor

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Embodiment Construction

[0036] The specific embodiment of the present invention is described in detail in conjunction with the accompanying drawings and technical solutions. The present invention selects a temperature sensor Pt100 with a stainless steel sheath diameter of Φ4mm and a length of 75mm.

[0037] 1. Establish the mathematical model of the temperature sensor Pt100 and the national standard No. 1 mercury thermometer, and determine the transfer function:

[0038] 1) Judging from the structure of the temperature sensor Pt100, the heat is transferred to the platinum thermal resistance wire through the sheath and the heat conduction medium. In the detection of the tested object, the heating environment is often a constant rate of heating, constant rate of cooling or constant temperature environment, and the influence of pure hysteresis is not significant. Each heat transfer can be regarded as a first-order inertial system with pure hysteresis, then the temperature sensor Pt100 can be regarded as...

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Abstract

The invention provides a method for compensating the temperature detected by a temperature sensor, belonging to the sensing measurement and control field. Firstly, a Chinese Standard No.1 mercury thermometer is taken as the temperature detecting standard, a mathematic model of the temperature sensor Pt100 is established, and a transfer function is determined; secondly, parameters of the transfer function of the temperature sensor Pt100 is determined through experiments, a third-order model is introduced to describe the temperature property of the temperature sensor, an MATLAB software is used to fit the experimental data, a penalty function is introduced, and a penalty algorithm is determined; and finally, a difference equation realized by computer language is transferred to fulfill the purpose of automatically detecting the temperature. The compensating method ensures that the dynamic property of the temperature sensor Pt100 approaches the dynamic property of the Chinese Standard No.1 mercury thermometer well, which is verified in the practical application well. The method is convenient and easy to implement and has accurate measurement result.

Description

technical field [0001] The invention belongs to the field of sensor measurement and control, in particular to a compensation method for temperature detection by a temperature sensor, which is applied to the field of precise temperature performance detection of automatic detection instruments. Background technique [0002] Early temperature detection was mostly manual operation, and the national standard No. 1 mercury thermometer was commonly used for temperature detection. With the development of computer technology, automatic detection instruments have gradually replaced manual instruments, and it is the general trend to use temperature sensors instead of liquid thermometers. The disadvantages of the manual detection instrument using the national standard No. 1 mercury thermometer are: low efficiency, inability to realize process control, especially inability to realize automation and informatization. The automatic detection instrument uses a temperature sensor Pt100 inste...

Claims

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Application Information

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IPC IPC(8): G01K7/21G01K15/00
Inventor 张元良周志民修伟王君明郎庆阳张刚杨小乐崔世界冯旭
Owner DALIAN UNIV OF TECH
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