Heat expansion coefficient high-flux detection device and control method thereof

Abstract

The invention relates to a heat expansion coefficient high-flux detection device and a control method thereof. The device comprises a laser emitter, a semi-reflecting lens, a heating table and a charge coupling device camera, wherein a sample to be tested is put on the heating table; the heating table generates heat so as to heat the sample to be tested; the sample to be tested expands; after light rays emitted by the laser emitter reach the semi-reflection lens, reflecting light and transmission light are respectively generated; the reflecting light is reflected into the charge coupling device camera; the transmission light is also reflected into the charge coupling device camera after being reflected on the surface of the sample to be tested. By using the technical scheme provided by theinvention, the detection precision of the heat expansion coefficient can be improved.

Description

technical field [0001] The present application relates to the technical field of automatic control, in particular to a thermal expansion coefficient high-throughput detection device and a control method thereof. Background technique [0002] The volume of alloy materials will change with the change of temperature, and the thermal expansion coefficient is an important parameter to measure this change, which is expressed as the amount of strain produced by the material under unit temperature change. In the field of engineering applications, the coefficient of thermal expansion is a very critical parameter for material selection and structural design. [0003] At present, the methods for measuring the thermal expansion coefficient of solid materials are basically a combination of theory and experiment, mainly including optical lever method, moire method, wedge method, laser scanning micrometry method, electronic speckle method, fiber Bragg grating method, ejector rod expansion ...

AI Technical Summary

Problems solved by technology

Each technology has its own applicable occasions, is not universal, and the operation is complicated, not efficient, and it is difficult to achieve high-throughput measurement of the thermal expansion coefficient of solid materials

For example, the temperature range measured by the optical lever method is small, the resolution is low, and it is difficult to identify materials with a small thermal expansion coefficient; the moiré method requires an accurate grating to be etched on the measurement surface, and the process requirements are relatively high. At the same time, it has caused certain damage to the material It has a certain impact on the performance of the material, and its optical path is complex, which requires high texture of the material

The workload is heavy, and the thermal expansion coefficient of a large number of samples cannot be measured efficiently; laser scanning micrometry and electronic speckle method have high requirements for the measurement environment, and the anti-interference ability is weak, and the measurement data is easily disturbed and produces large errors. Satisfy the high precision requirements of measurement data

The fiber grating method needs to fix the grating on the surface of the material or embed it inside the material, heat it together with the material to directly measure its thermal expansion, and then obtain the measurement result through theoretical calculation, but the fiber grating cannot be reused after the measurement, and it needs to be measured again Therefore, the workload is large and the efficiency is not high; the ejector rod expansion method is a non-absolute measurement method that requires further calibration work, and this method belongs to contact measurement. The mechanical stress will affect the accuracy of the test results, so the measurement accuracy of this method is low; Michelson interferometry, the two beams of light that interfere in this method come from the reflection of the sample and the standard, the standard and the sample platform and other components The inevitable thermal expansion will also affect the test accuracy, and the test results are not intuitive

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