Sheet thickness online measurement system based on laser ultrasound

Abstract

A sheet thickness online measurement system based on laser ultrasound comprises a light path system integration, a high-temperature detection meter, a data acquisition system integration and a data processing system integration, wherein the light path system integration comprises a U-shaped grounding frame, a three-dimensional mobile platform and a control cabinet integrating with a laser transmitter and a light path regulating system; the data acquisition system integration comprises a capacitive displacement sensor, a pre-amplifier and a high-speed data acquisition card, the capacitive displacement sensor is arranged at the first distance position below the alignment position of the bottom surface of a sheet, the data processing system integration converts bipolar signals having aliasing peak values and complex background noise into unipolar signals having clear peak values and low background noise, and therefore the time when longitudinal waves and transverse waves reach the alignment position of the bottom surface of the sheet first two times is accurately obtained, and the thickness of the sheet is calculated. The sheet thickness online measurement system has the advantages that the sheet thickness online measurement system is suitable for online measuring the thickness of the sheet under extreme environments such as high temperature, strong corrosion and high radiation, thickness measurement is accurate, and errors are small.

Description

technical field [0001] The invention relates to the technical field of non-destructive measurement, in particular to a system for performing laser ultrasonic online thickness measurement on plates. The system is suitable for online measurement of plate thickness in extreme environments such as high temperature, strong corrosion, and high radiation. Background technique [0002] In the actual industrial production process, the uniformity of plate thickness is an important indicator, which is directly related to the amount of subsequent processing, affecting the final product yield and overall processing cost. Whether the plate thickness can be measured quickly and accurately online, and whether the process can be adjusted in time according to the measurement results is very important for the thickness uniformity of the plate. Since the plates used in industrial production often have rough surfaces, unevenness, and unstable temperatures, and the working environment is usually ...

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Problems solved by technology

In such cases, there is a large error in obtaining the thickness value of the plate by using the laser receiver, signal converter, etc. to find the deviation value of the reflected laser angle. Perhaps this method is applicable to the field of thickness measurement of optical components, but due to the fact that industrial production of plates is often The surface is rough, uneven, and the temperature is unstable. Therefore, this method has a large error for the thickness measurement of industrial production plates, so it is not a reasonable choice.

Moreover, the basic components of this type of device include laser transmitters, laser receivers, photoelectric signal converters and other equipment. The cost of these three types of equipment is relatively high, and the overall equipment cost is not optimistic.

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