[Transparent object] [High precision thickness measurement] Choose this laser displacement sensor
[Transparent object] [High precision thickness measurement] Choose this laser displacement sensor
In the manufacturing process of PCB (printed circuit board), it is often necessary to install transparent or semi transparent acrylic sheets on the PCB board.
In the manufacturing process of PCB (printed circuit board), it is often necessary to install transparent or semi transparent acrylic sheets on the PCB board. These acrylic sheets not only provide protection, but may also serve as a part of the display or operating interface.
The thickness control of acrylic sheet is crucial for the overall performance and quality of the product. Therefore, manufacturers need to install sensors to accurately measure the thickness of acrylic sheets.
Application scenario
1. Check the thickness of the transparent acrylic board on the PCB board.
2. Use a single laser displacement measurement to calculate the thickness value by measuring the distance from the upper surface of the acrylic sheet (the distance from the lower surface of the acrylic sheet to the platform is a fixed reference)
3. The accuracy requirement is within 10 microns, and the detection distance is around 50mm, requiring serial communication feedback on specific displacement changes
Difficulty analysis:
1. Acrylic board is made of transparent material with a thickness of 2mm-4mm, and the laser will penetrate through the surface of the object after being emitted
2. Single laser thickness measurement is more susceptible to the influence of the on-site environment
3. The displacement error of standard diffuse reflection laser is too large to be used
Recommended Selection
The Meiji laser displacement MLD33 series can be selected, with high accuracy (linear accuracy ± 0.1% F.S, repeatability of 8um), and two detection principles of diffuse reflection and normal reflection. The MLD33 series based on the normal reflection detection principle can stably detect transparent objects/mirror bodies, suitable for the detection scene of transparent acrylic thickness measurement.
Implementation steps:
1. Sensor installation:
Install the laser displacement sensor above the PCB board and tilt it at a 15 ° angle to ensure that the laser beam can be directed onto the acrylic board.
2. Parameter settings:
According to the material and thickness range of the acrylic board, set the measurement parameters of the sensor, such as laser power, exposure time, etc.
3. Measurement process:
Activate the sensor and start measuring the thickness of the acrylic sheet. Sensors will output real-time measurement data and can be transmitted to computers or control systems for further analysis through data interfaces.
Installation Diagram
1. The principle of forward and backward reflection detection can stably detect transparent/mirror bodies, suitable for the current scene
2. Linear accuracy ± 0.1% F.S, repeatability accuracy 8um
3. After undergoing XYZ three-way 1.5mm amplitude testing at the factory, even slight vibrations do not affect the accuracy of the data
4. Support serial port 422 communication and single channel switch output
+86 18188641602
Akusense Technology Co., Ltd.