Principle of Laser Displacement Sensor

Laser displacement sensors measure precise geometric measurements such as displacement, thickness, vibration, distance, and diameter. Lasers have excellent linearity and military laser pointer displacement sensors have higher accuracy than our known ultrasonic sensors. However, the laser generating device is relatively complicated and bulky, and therefore the application range of the laser displacement sensor is demanding. According to the measurement principle, the laser displacement sensor is divided into laser triangulation method and laser echo analysis method. Laser triangulation method is generally suitable for high-precision and short-distance measurement, while laser echo analysis method is used for long-distance measurement. Principle of laser triangulation and principle of laser echo analysis.

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The laser displacement sensor uses the principle of echo analysis to measure the distance to achieve a certain degree of accuracy. The inside of the sensor is composed of a processor unit, an echo processing unit, a laser transmitter, a laser receiver and the like. The waterproof laser pointer displacement sensor emits one million laser pulses per second through the laser emitter to the detector and returns to the receiver. The processor calculates the distance required by the laser pulse to meet the time required to reach the detector and return to the receiver. The output value is the average output of thousands of measurements. This is the so-called pulse time method. The laser echo analysis method is suitable for long-distance detection, but the measurement accuracy is lower than the laser triangulation method, and the farthest detection distance can reach 250m.

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Semiconductor laser diode (LD) is a kind of laser used in optical communication system to build optical communication system. It can be used directly as a light source for optical communication, or as a pump source for lasers and amplifiers. Important position. It has the characteristics of semiconductor devices: small size, simple structure, high efficiency, and direct modulation, but the output power, monochromaticity and directionality are not as good as other lasers. Laser diodes have a wide range of functions and are often used as indicator light to point to the target, as a bright light to set off the atmosphere, as a surgical light for surgery, for measuring distance, for illumination, and for refrigeration. When the 532nm laser pointer diode is working, the heat consumption accounts for more than 50% of the total power consumption, and the negative impact of heat consumption is relatively large. Reduce output power and shorten service life. It can even cause the temperature of the LD to be unstable to change its output wavelength. To solve these problems, we need to do research on heat dissipation.

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For low power laser diodes, passive cooling can meet the demand. The larger ones can use air cooling. However, these two methods of heat dissipation have many limitations. Water-cooling heat dissipation is a high-performance heat dissipation method using laser diode cooling. The copper heat-absorbing box is placed in the hot core part, and the water pump and the heat sink are connected through the pipeline to transfer heat to the external heat dissipation. This heat sink is primarily used as a horizontal laser diode stack in diode pump lasers or direct diode lasers for industrial, medical and research applications.

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Laser displacement sensors are commonly used for measuring physical quantities such as length, distance, vibration, speed, and azimuth. They can also be used for flaw detection and monitoring of atmospheric pollutants. Position identification of small parts; monitoring of parts on the conveyor belt; detection of material overlap and coverage; control of robot position (tool center position); device status detection; device position detection (through small holes); liquid level monitoring; Thickness measurement; vibration analysis; collision test measurement; vehicle related test. Thickness measurement of foil and sheet: The 18650 laser pointer sensor measures the thickness of the foil (thin sheet). Detection of changes in thickness can help detect wrinkles, small holes or overlaps to avoid machine failure.

Cylinder measurement, simultaneous measurement: angle, length, inner and outer diameter eccentricity, conicality, concentricity and surface profile. Measurement of length: The component to be measured is placed on a conveyor belt at a specified position, and the laser sensor detects the component and measures it simultaneously with the triggered laser scanner, and finally obtains the length of the component. Uniformity inspection: put a few laser sensors in a row in the oblique direction of the workpiece motion to be measured, and directly output the metric value through a sensor. Alternatively, a software can be used to calculate the metric value and read the result according to the signal or data.

Inspection of electronic components: Two laser scanners are used to place the device under test between the two, and finally the data is read by the sensor to detect the accuracy and integrity of the component. Inspection of the filling level on the production line: The laser sensor is integrated into the production of the filling product, and when the filling product passes the sensor, it can be detected whether it is filled or not. The sensor uses an extended program of the astronomy laser pointer beam reflecting surface to accurately identify the filling of the filling product and the number of products.

Water-cooled heat dissipation has the characteristics of high heat dissipation efficiency, quietness, greenness and stability, and is very suitable for heat dissipation of electronic devices below 3000W. The cooling of semiconductor laser diodes is a very important part. The application of water cooling and heat dissipation has greatly improved the short board of heat dissipation, which has effectively promoted the good development of LD equipment.