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High-precision temperature measurement system based on resistance value comparison method

A comparative and high-precision technology, applied in the direction of thermometers, thermometers, measuring devices, etc., which are directly sensitive to heat-sensitive electrical/magnetic components, can solve the problem that the temperature measurement accuracy cannot be very high, and reduce the use of restrictions, high Accuracy, the effect of reducing power consumption

Inactive Publication Date: 2016-03-23
HARBIN MIMI RICE IND TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the influence of platinum resistors on their own errors, system errors of resistance measurement, ambient temperature, and lead wires, the temperature measurement accuracy cannot be very high, and there will be certain restrictions on use.

Method used

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  • High-precision temperature measurement system based on resistance value comparison method
  • High-precision temperature measurement system based on resistance value comparison method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Such as figure 1 , figure 2 As shown, a high-precision temperature measurement system based on the resistance value comparison method is composed of a temperature signal acquisition element, an analog-to-digital converter, a control unit, and a display device; the temperature signal acquisition element adopts a Pt1000 platinum thermal resistance; The digital converter adopts AD7712; the control unit adopts MSP430F149 single-chip microcomputer; the display device adopts LCD1602 liquid crystal; the temperature signal acquisition element is connected to the analog-digital converter, and the analog-digital converter is connected to the control unit; device.

[0018] The Pt1000 thermal resistance is connected in series with a reference resistance of known resistance, powered by a 5V power supply.

[0019] The thermal resistor Pt1000 senses the temperature change and generates a corresponding voltage change, and the voltage signal is converted into a digital signal...

Embodiment 2

[0024] Such as figure 1 As shown, what the present invention designs is the temperature measuring circuit with Pt1000 platinum thermal resistance as temperature signal acquisition element, AD7712 as analog-to-digital converter, MSP430F149 single-chip microcomputer as control unit, LCD1602 liquid crystal as display device; Pt1000 thermal resistance is used in the circuit It is connected in series with a reference resistor of known resistance and powered by a 5V power supply; the thermal resistor Pt1000 will sense the temperature change and generate a corresponding voltage change. The system reads; the single-chip microcomputer system will identify, process and calibrate the read digital signal, and convert it into a digital signal corresponding to the temperature, and transmit it to the liquid crystal display, and the display will output the temperature value; due to the different functions of the selected chips, The temperature measurement circuit can be divided into variou...

Embodiment 3

[0026] Such as figure 2 Shown, the main function of software among the present invention is: the integrated A / D converter AD7712 converts the physical signal measured by the temperature sensor Pt100 into a digital signal by A / D, and then sends it into the single-chip microcomputer MSP430F149 Carry out calibration, and finally display the calibrated digital signal on the liquid crystal display 1602; apply the idea of ​​modular programming, divide the system software into several parts such as main program, data acquisition program, data conversion program and data display program, so that it can realize The function of the system; the main program of the system is the most important part of the entire system software, it is used to manage all the functions that can be realized by the temperature measurement circuit; the main program is the main body of the system software, it can organically connect other subroutine modules Together, they form a whole, call the corresponding...

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Abstract

The invention provides a high-precision temperature measurement system based on a resistance value comparison method. The high-precision temperature measurement system is composed of a temperature signal acquisition element, an analog-to-digital converter, a control unit and a display device. The temperature signal acquisition element uses a Pt1000 platinum thermistor. The analog-to-digital converter uses AD7712. The control unit uses an MSP430F149 single-chip microcomputer. The display device uses LCD1602 liquid crystal. The temperature signal acquisition element is connected with the analog-to-digital converter which is connected with the control unit. The control unit is connected with the display device. Influence of platinum resistor error, resistance measurement system error and environment temperature and lead wires on the conventional temperature measurement method based on the resistance value comparison method can be overcome so that temperature measurement is enabled to achieve higher precision, use limitation can be reduced and power consumption of the system can be effectively reduced.

Description

technical field [0001] The invention relates to a temperature measurement system, in particular to a high-precision temperature measurement system based on a resistance value comparison method. Background technique [0002] Temperature is a physical quantity that represents the degree of hot or cold of an object, and is one of the seven basic physical quantities in the International System of Units. Whether in agriculture, industry, scientific research, national defense and people's daily life, temperature measurement and control has become an extremely important topic. In the fields of industry and agriculture, scientific research, and national defense technology, the accuracy of temperature control is particularly important, and temperature measurement is the external manifestation of temperature control. In the field of temperature measurement, the measurement of temperature is generally transformed into the measurement of resistance, so the precise measurement of resist...

Claims

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Application Information

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IPC IPC(8): G01K7/18G01K7/21
CPCG01K7/18G01K7/21
Inventor 王树鑫
Owner HARBIN MIMI RICE IND TECH CO LTD
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