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Composite steel plate refers to steel that is made from one or more types of steel combined together. Composite steel plates are designed to protect ordinary steel plates from rusting; by using methods such as electroplating, bonding, and spraying, a protective layer is applied to the surface of the steel plate, thereby creating a composite steel plate. High-precision measurement of the thickness of sheet-shaped objects in motion on a composite steel plate rolling production line is extremely important for product output and quality control. Currently, although radiation and X-rays can be used to accurately measure steel plate thickness on steel plate rolling production lines, their application requires a high level of capability in terms of management. To this end, in terms of thickness measurement devices, laser thickness gauges using optical distance sensors are employed. A thickness gauge is a unit for collecting thickness data; it is equipped with 2 pairs of laser probes (the number of probes can be adjusted as needed) to acquire the thickness data of steel plates. The thickness gauge has an overall C-shaped frame structure and uses non-contact laser measurement; both online measurement and maintenance after the production line are carried out without affecting the normal operation of the rolling line. The control cabinet is the display and control unit of the system, usually installed in the control room; it is responsible for controlling the startup, shutdown, and measurement functions of the thickness gauge. The control cabinet is equipped with an industrial computer, a monitor, audio-visual alarms, as well as the system’s synchronization circuitry, control circuits, and communication system. Data is transmitted between the laser probe and the industrial computer via a serial shielded cable, with a transmission distance of over 100 meters. The industrial computer processes and calculates the acquired images and data, with the results being displayed on an LCD monitor and an on-site LED display. The blower is the cooling and dust-proof device for the thickness gauge; it is equipped with an air filtration system to ensure that the air supplied to the thickness gauge is clean and cold. The air outlet of the thickness gauge is located in the direction directly opposite the measuring head, allowing it to cool the head while also preventing oxidation dust and moisture from contaminating it. The laser thickness gauge enables real-time display of the thickness changes in the rolled steel strip, allows for immediate feedback on quality issues such as \"out-of-tolerance alerts\", and helps to ensure that the thickness quality standards for composite steel plates are met. The C-measuring vehicle offers various motion control options, and can be customized for functions such as \"computer-controlled movement\", \"manual control of movement\", \"automatic scanning\", and \"fixed-point measurement\" to meet different measurement requirements. The laser is equipped with shock-absorbing measures, and the entire measurement vehicle is mounted on shock-absorbing horizontal guides, which enable it to withstand significant impacts from the equipment; this ensures measurement accuracy and also facilitates removal for maintenance. The entire cabinet is sealed with an air shield and cooled by circulating water, which prevents the entry of mist, dust, and iron oxide scale. Laser thickness gauges are used to measure the thickness of various sheet materials, ensuring quality control and enabling high-quality production. By conducting inspections and adjustments during the production process, these devices help improve efficiency and facilitate intelligent, automated manufacturing.