High-precision platinum resistor temperature measuring system and temperature measuring method based on same

A platinum resistance, high-precision technology, applied in the field of temperature measurement systems, can solve the problems of system error, high-resolution A/D converter price increase, high cost of measuring instruments, etc., and achieve the effect of reducing equipment costs

Inactive Publication Date: 2010-01-27
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

This type of method needs to solve two problems: (1) Due to the influence of temperature on the resistance value of the platinum resistor and the amplifier, the system will produce a certain system error when the ambi

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  • High-precision platinum resistor temperature measuring system and temperature measuring method based on same
  • High-precision platinum resistor temperature measuring system and temperature measuring method based on same

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Embodiment Construction

[0026] The implementation of the present invention will be further described below in conjunction with the accompanying drawings. figure 1 It is a structural representation of the present invention.

[0027] according to figure 1 Connect the circuit, the high-precision platinum resistance temperature measurement system of the present invention includes an RC oscillator 101, a frequency measurement chip 102, a reference clock circuit 103 and a single-chip microcomputer 104, a liquid crystal display 105, a host computer 106, and the RC oscillator 101 includes a first capacitor C1 and the platinum resistance sensor Rt, the platinum resistance sensor Rt adopts a two-wire connection method, one end of which is connected to one end of the first capacitor C1, and at the same time connected to the P pin of the frequency measurement chip 102, and the other end is connected to the N of the frequency measurement chip 102 Pin, the other end of the first capacitor C1 is grounded, the freq...

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Abstract

The invention relates to a high-precision platinum resistor temperature measuring system and a temperature measuring method based on the system. The high-precision platinum resistor temperature measuring system comprises an RC oscillator (101), a frequency measuring chip (102), a reference clock circuit (103), an SCM (104), a liquid crystal display (105) and a supervisory computer (106), wherein a platinum resistance sensor and a fixed capacitor form the RC oscillator (101) together by a two-wire connecting method; when the temperature changes, a resistance value of a platinum resistor is changed along with the temperature, the oscillation frequency of the oscillator is changed, thereby modulating the variation of the platinum resistor into a time-variant frequency signal; the frequency variation is measured by the frequency measuring chip; a measured value is transmitted to the supervisory computer; the calculation from frequency variation to temperature variation is finished in the supervisory computer by a high order polynomial equation, thereby realizing the high-precision temperature measurement by the platinum resistor. The invention has the characteristics of high temperature measuring precision, low realization cost and favorable stability.

Description

technical field [0001] The invention relates to a temperature measurement system, in particular to a high-precision platinum resistance temperature measurement system. Background technique [0002] Temperature is one of the seven basic physical quantities in the International System of Units. The standard platinum resistance thermometer has the characteristics of high precision, high sensitivity and high stability, so it is widely used in the temperature measurement of intelligent instruments. Most of the existing methods are to convert the resistance change into a voltage signal through a resistance bridge, and then send it to the A / D converter to complete the temperature acquisition after a series of filtering and amplification processing. This type of method needs to solve two problems: (1) Due to the influence of temperature on the resistance value of the platinum resistor and the amplifier, the system will produce a certain system error when the ambient temperature cha...

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Application Information

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IPC IPC(8): G01K7/18G01K7/20
Inventor 沈峘李舜酩毛建国李芳培柏芳超
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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