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How 3D Line Laser Profile Sensors Work
2021-09-15
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The 3D line laser profile sensor adopts the principle of laser triangulation. First, a laser beam is used to irradiate the surface of the object to be measured, and the reflected light forms a spot on the surface of the photosensitive element through the optical lens group. As shown in the figure below, when the detected surface is too high, the measurement laser spot position will move to the right; on the contrary, if the detected surface is lower, the measurement laser spot position will move to the left. The 3D line laser profile sensor uses not a point laser light source, but a laser line, and the measuring light laser spot is also a line, so it is commonly called a line laser. Line lasers can also area scan to quickly form 3D contours.
The maximum linearity of the laser displacement sensor using the triangulation method can reach 1um, and the resolution can reach the level of 0.1um. For example, the ZLDS100 type sensor can achieve 0.01% high resolution, 0.1% high linearity, 9.4KHz high response, and adapt to harsh environments. Laser displacement sensors use the principle of echo analysis to measure distance to a certain degree of accuracy.
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