Photoelectric metal linear expansion coefficient determination device

Abstract

The invention relates to a photoelectric metal linear expansion coefficient determination device, which comprises a bracket, a heating cylinder, a to-be-tested piece, a push rod, a light barrier, a light source, a PSD sensor, a temperature sensor, an amplifier I, an amplifier II, a single chip microcomputer, a button and a display. That is to say, on the basis of a traditional metal linear expansion coefficient measurement device, the light barrier, the light source and the PSD sensor are employed to replace an optical lever and a ruler reading telescope apparatus. The push rod is placed above a to-be-tested metal bar, the light barrier is fixed above the push rod, when a metal rod elongates under heating, the metal rod makes the push rod drives the light barrier to move upward, and light spots formed by the light source emitted light penetrating light barrier slits and falling on the PSD sensor also move upward. Conversely, when the metal rod shortens, the light spots move down. Movement of the light spots causes change of the PSD sensor's output current, and after amplification, single chip microcomputer detection is converted to displacement. The single chip microcomputer can acquire temperature difference change and displacement, thereby calculating the metal linear expansion coefficient.

Description

technical field [0001] The invention relates to electronic technology, sensor technology and single-chip microcomputer technology in physics, especially the comprehensive application of electronic technology, sensor technology and single-chip microcomputer technology to physics. Background technique [0002] The measurement of the thermal expansion coefficient of materials is very necessary to grasp the properties of materials and correctly apply various materials. The traditional method of thermal expansion measurement of materials uses optical levers and ruler-reading telescopes to measure the length growth of materials. This method is inconvenient to operate and time-consuming to adjust. , After the adjustment is correct, it is easy to be disturbed by the outside world, and the measurement error is relatively large. The invention adopts the principle of photoelectric technology, and adopts optical amplification technology to amplify the tiny displacement, so as to improve...

AI Technical Summary

Problems solved by technology

[0003] In order to improve the sensitivity and accuracy of material expansion coefficient measurement and solve the problem of inconvenient operation of traditional methods, a photoelectric metal linear expansion coefficient measurement device is designed, which includes a bracket (1), a heating cylinder (2), and a test piece ( 3), ejector rod (4), light barrier (5), light source (6), PSD sensor (7), temperature sensor (8), amplifier I (9), amplifier II (10), microcontroller (11), button (12) and the display (13); the heating cylinder (2) is fixed on the base of the bracket (1), and the light baffle (5), the light source (6), and the PSD sensor (7) are fixed on the crossbar of the bracket (1); The test piece (3) is put into the heating cylinder (2), the ejector rod (4) is installed between the test piece (3) and the light baffle (5); the temperature sensor (8) is installed on the side of the heating cylinder (2) in the wall

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