Micro-power consumption intelligent digital thermometer and temperature measurement method

Abstract

The invention provides a micro-power consumption intelligent digital thermometer and a temperature measurement method, and belongs to the field of industrial temperature measurement equipment. The micro-power consumption intelligent digital thermometer is characterized by comprising a power supply unit and a data processing unit, wherein the data processing unit comprises a biased sampling module, an AD conversion module, a central processing unit and a display module, and the biased sampling module, the AD conversion module, the central processing unit and the display module are sequentially connected. The temperature measurement method includes the following steps that 1, a system is initialized; 2, the biased sampling module is started; 3, AD sampling is started; 4, the central processing unit judges whether sampling is finished; 5, the biased sampling module is cut off; 6, AD conversion is started; 7, the central processing unit judges whether conversion is finished; 8, AD hibernation is conducted; 9, data reading and filtering are carried out; 10, AD cutoff is performed; 11, data calculation and table look-up are carried out; 12, the display module carries out displaying; 13, a refresh time judgment is displayed; 14, the central processing unit hibernates; 15, the central processing unit judges whether hibernation time is reached. The micro-power consumption intelligent digital thermometer has the advantages of micro power consumption, high precision and good stability.

Description

Technical field [0001] A micro-power consumption intelligent digital thermometer and a temperature measurement method belong to the field of industrial temperature measurement equipment. Specifically, it relates to a digital thermometer with high precision, good stability and low power consumption and a temperature measurement method. Background technique [0002] At present, in the field of industrial temperature measurement, there are two types of main application instruments, one is a bimetal thermometer, and the other is a traditional analog instrument with a 4-20mA output. Bimetal thermometers have shortcomings such as low accuracy, poor stability, and inconvenient readings. For traditional analog meters with 4-20mA output, the temperature sensor is biased by a constant current source, and the voltage drop at both ends is signaled through an instrumentation amplifier. Conditioning, which requires expensive constant current sources, multiple resistors and capacitors, and sev...

AI Technical Summary

Problems solved by technology

Bimetallic thermometers have the disadvantages of low precision, poor stability, and inconvenient readings; for traditional analog instruments with 4-20mA output, the temperature sensor is biased by a constant current source, and the voltage drop at both ends passes through an instrument amplifier. Conditioning, which requires expensive constant current sources, multiple resistors and capacitors, and several operational amplifiers or separate instrumentation amplifiers, requires a low-noise and stable system for calibration, and requires operators to optimize during production. This analog The cost of measurement technology is high and the accuracy is low. Another disadvantage of this type of instrument is that it needs an external 24V DC power supply, which is largely restricted by site conditions.

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