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Method and device for precisely measuring temperatures of platinum resistors

A technology for temperature measurement and measurement device, which is applied to measurement devices, thermometers using electrical devices, and thermometers with electrical/magnetic components directly sensitive to heat, etc. High precision requirements, interference suppression, and the effect of reducing system errors

Inactive Publication Date: 2014-12-24
JIANGNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Using platinum resistors for high-precision temperature measurement needs to overcome several technical difficulties: lead resistance, self-heating effect, component drift, and noise interference, etc. The existing measurement devices cannot solve the above problems at the same time

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  • Method and device for precisely measuring temperatures of platinum resistors
  • Method and device for precisely measuring temperatures of platinum resistors
  • Method and device for precisely measuring temperatures of platinum resistors

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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] Pt100 platinum resistance is a temperature sensor made by utilizing the physical characteristics that the resistance value of metal platinum (Pt) changes with temperature. The key to using Pt100 as a temperature measuring element for temperature measurement is to accurately measure the resistance value of Pt100. According to the IEC751 international standard, the commonly used Pt100 (R 0 =100Ω) is a platinum resistor designed uniformly with the temperature coefficient TCR=0.003851 as the standard. Its temperature-resistance characteristics have a small nonlinearity, and the actual calculation generally adopts linearization processing. The temperature calculation formula is as follows: t=(R t -100) / 0.3851.

[0028] According to the temperature characteristics of Pt100 platinum resistance, the four-wire Pt100 platinum resistance high-...

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Abstract

The invention discloses a method and a device for precisely measuring temperatures of platinum resistors. The scheme for measuring the temperatures of the micro-current-drive four-wired Pt100 platinum resistors includes that the device for precisely measuring the temperatures of the platinum resistors comprises a constant-current source drive circuit, a four-wired platinum resistor interface circuit, an instrument amplifier circuit, an anti-aliasing filter circuit, a sampling hold circuit, an A / D (analog / digital) sampling circuit and a single chip microcomputer system. A constant-current source comprises two low-noise and low-offset bipolar operational amplifiers OP07CD with high open-loop gain; the four-wired platinum resistor interface circuit is divided into a constant-current source power lead and a voltage drive lead; the instrument amplifier circuit comprises a double-stage differential amplifier circuit; the anti-aliasing filter circuit is an RC low-pass filter circuit; an A / D converter is a 24-bit high-resolution A / D converter CS5550. The method and the device have the advantage that the measurement precision is high, calibrated temperature measurement errors are smaller than + / -0.03 DEG C, and requirements of industrial production procedures on high temperature measurement precision can be met.

Description

technical field [0001] The invention relates to the field of industrial production process detection, in particular to a high-precision Pt100 platinum resistance temperature measurement method and device. 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. For example, the combined alkali production in the chemical industry requires the temperature difference to be controlled at 0.2°C, and the temperature measurement is required to be better than 0.05°C within the working range of the chromatograph. Platinum resistance temperature sensors are widely used as ideal temperature measuring components in industrial precision measurement systems because of their high precision, g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K7/18G01K7/20
Inventor 潘丰潘杰
Owner JIANGNAN UNIV
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