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A Hardware Nonlinear Compensation Method for Platinum Resistance Temperature Measurement

A non-linear compensation and platinum resistance technology, which is applied in the direction of thermometers, thermometers, and measuring heat with electric/magnetic elements that are directly sensitive to heat, to achieve the effect of simple wiring, good tracking characteristics, and easy adjustment

Active Publication Date: 2019-06-25
JIANGSU DONGJIA ELECTRICAL
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Pt1000 platinum resistance as a commonly used sensor for precision temperature measurement has the advantages of stable performance, good repeatability, and small error, but there is a certain nonlinear error

Method used

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  • A Hardware Nonlinear Compensation Method for Platinum Resistance Temperature Measurement
  • A Hardware Nonlinear Compensation Method for Platinum Resistance Temperature Measurement

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Embodiment Construction

[0026] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0027] For platinum resistors that meet international standards, the change of platinum resistance value PT with temperature is usually expressed by formula (1):

[0028] PT=PT 0 [1+aT-bT 2 -cT 3 (T-100)] (1)

[0029] Among them, T is the measured temperature in degrees Celsius; PT 0 It is the platinum resistance value at 0°C, the common ones are 100Ω, 500Ω and 1000Ω; a=3.90802×10 -3 , b=5.80195×10 -7 and c (when T≥0℃, c=0; when T-12 ) is the temperature coefficient.

[0030] The coefficient c works only at negative temperatures. It can be seen through simple estimation that even if the temperature is as low as -100°C, its influence is less than 0.1%, so it can be ignored in most cases, and formula (1) becomes formula (2) :

[0031] PT=PT 0 [1+aT-bT 2 ] (2)

[0032] The first item in the formula (2) is a DC bias, and the circuit o...

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Abstract

The invention discloses a hardware nonlinear compensating method for platinum resistance temperature measurement. A nonlinear compensating circuit is adopted for taking out one part of positive feedback from output of a measuring circuit to an input end of the measuring circuit, and the feedback current is gradually increased along with temperature rise, so that the circuit has very good tracking characteristic, and good compensating effect can be obtained in a low-temperature region and a high-temperature region, and therefore, nonlinear errors of platinum resistance temperature measurement are corrected. The measuring device adopting the method consists of an offset compensating circuit, a measuring circuit, a nonlinear compensating circuit, a gain circuit and a reference voltage circuit. The temperature measuring device is simple in circuit, is easy to regulate and is good in nonlinear compensating effect.

Description

technical field [0001] The invention relates to the field of industrial production process detection, in particular to a hardware nonlinear compensation method for platinum resistance temperature measurement. Background technique [0002] Temperature is a very important measurement parameter in industrial production process. The accuracy of temperature measurement and control directly affects product production and product quality. With the development of measurement technology, the requirements for temperature measurement accuracy are getting higher and higher. Platinum resistance temperature sensors are widely used as ideal temperature measuring components in industrial precision measurement systems because of their advantages such as wide temperature range, high accuracy, good reliability, etc., and fast response speed. [0003] -50-500°C is the most commonly used temperature range for scientific research and industrial production. The standard platinum resistance thermo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K7/25
CPCG01K7/25
Inventor 潘丰沈正阳
Owner JIANGSU DONGJIA ELECTRICAL