Compensation method for automatic temperature detection and automatic temperature detection system

Abstract

The invention relates to a compensation method for automatic temperature detection and an automatic temperature detection system. According to the method, the temperature is risen for detection by using a water bath constant temperature heating method, a static characteristic value of a temperature sensor is calibrated by using a liquid thermometer, and the time constant and the compensation function of each heat transfer characteristic are determined by using a three-order system formed by connecting three first-order systems in series and a first-order inertial system with pure lag respectively. The system is formed by connecting a constant current source, a temperature sensor, a signal conditioning amplifier, an A / D (Analog / Digital) converter, a single-chip microprocessor and a computer. The automatic temperature detection system has the characteristics that the dynamic characteristic of the automatic temperature detection system approaches the liquid thermometer, and the calibration of the detection instrument parameters can be finished by only performing experimental calibration once according to the characteristic that the automatic temperature detection system with the temperature sensor of the same type has the same transfer function in a relatively stable experimental environment, so that the accuracy and the convenience of the system are improved.

Description

technical field [0001] The invention relates to a sensing measurement and control technology, in particular to a compensation method for automatic temperature detection and an automatic temperature detection system, which are applied in the field of automatic and precise temperature detection. Background technique [0002] In the national testing standards related to temperature, the temperature parameters are calibrated by liquid thermometers. As automatic detection instruments gradually replace manual instruments, it is the general trend to replace liquid thermometers with automatic temperature detection systems. When measuring temperature, the existing automatic temperature detection system draws a temperature change curve according to the temperature change characteristics of the temperature sensor, and calibrates several points of the temperature change curve in combination with the measurement results of the liquid thermometer. According to the performance of selected...

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Problems solved by technology

This correction method requires the product under test to be tested under specific conditions, and the difference in dynamic characteristics between the two is particularly prominent when the temperature is raised and lowered rapidly, which may easily cause errors in the measurement results.

This method of selecting special temperature points and using linear calibration between points has great limitations, and each temperature detection system needs to be corrected one by one to make the temperature automatic detection system consistent with the measurement of the liquid thermometer. Inconvenient to use

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