An online measurement system for plate thickness based on laser ultrasonic

Abstract

An online plate thickness measuring system based on laser ultrasonics comprises a light path system integration module, a high-temperature detector, a data collection system integration module and a data processing system integration module. The light path system integration module comprises a U-shaped grounding frame, a vertical moving platform and a control cabinet, a laser transmitter, a light path adjusting system and a scanning galvanometer are integrated in the control cabinet, the data collection system integration module comprises a capacitive displacement sensor, a preposed amplifier and a high-speed data collection card, the capacitive displacement sensor is arranged at a first distance position above the upper surface of a plate, and the data processing system integration module converts bipolar signals with aliasing peak value and complex background noise into unipolar signals with clear peak value and low background noise so as to accurately acquire time when longitudinal wave and transverse wave reach an O point on the upper surface of the plate in two previous times to calculate thickness of the plate. The online plate thickness measuring system has the advantages that the system utilizes a laser ultrasonics principle to measure thickness and is suitable for online measuring of thickness of the plate in extreme environment with high temperature, high corrosion and high radiation, accurate in thickness measuring and few in thickness measuring error.

Description

technical field [0001] The invention relates to the technical field of non-destructive measurement, in particular to a laser ultrasonic online thickness measurement system for industrially produced plates, which 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 usual...

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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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