Experimental device for measuring solid linear expansion coefficient by using PSD device

Abstract

The invention relates to an experimental device for measuring a solid linear expansion coefficient by using a PSD device, which comprises a heating device, a thermistor sensor, a computer, a PSD displacement detection system, a hollow solid rod to be detected and a fixing base. The heating device is a steam pot, and an air outlet of the steam pot is connected with a hollow cavity body of the hollow solid rod to be measured; one end of the thermistor sensor is connected with the hollow solid rod to be measured, and the other end of the thermistor sensor is connected with a computer; the PSD displacement detection system comprises a laser diode, a PSD working area, a converging lens and a receiving lens, wherein laser emitted by the laser diode is hit on the surface of the hollow solid rod to be detected through a main optical axis of the converging lens, and is reflected and imaged in the PSD working area through the main optical axis of the receiving lens, and current is output at thetwo ends of the PSD working area and is output to the computer for calculation through A\D sampling to obtain the displacement of the hollow solid rod to be measured. The device has high precision andimportant significance for physical experiment teaching and even practical application.

Description

technical field [0001] The invention relates to the field of physical experiments, in particular to an experimental device for measuring the coefficient of linear expansion of a solid using a PSD device technical background [0002] When the temperature of a solid substance rises by 1°C, the amount of elongation per unit length is called the "linear expansion coefficient". Due to different substances, the linear expansion coefficient is also different, and its value is also the same as the actual temperature and the determined length 1. the selected reference temperature. The coefficient of linear expansion is one of the experimental items for students in the physics department of colleges and universities. The common measurement methods include the mandrel-type indirect method and the telescope direct-reading method. learning process. However, there is currently a lack of a small error, high precision and convenient measurement method in college experiments. Among them, t...

AI Technical Summary

Problems solved by technology

The coefficient of linear expansion is one of the experimental items for students in the physics department of colleges and universities. The common measurement methods include the mandrel-type indirect method and the telescope direct-reading method. learning process

However, there is currently a lack of a small error, high precision and convenient measurement method in college experiments. Among them, the laser method scans the sample with a laser beam, which can continuously measure the change of the length of the sample during the heating process, so the measurement accuracy is high. , the error is small, in addition, it will be a more intelligent and convenient way to apply the automatic control, recording and multi-function system composed of computer to the experimental measurement of solid linear expansion coefficient

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