The laser emitter emits visible red laser light to the surface of the measured object through the lens. The laser light scattered by the surface of the object passes through the receiver lens and is received by the internal CMOS photosensitive element. According to different distances, the CMOS photosensitive element can "see" the light spot at different angles. According to this angle and the known distance between the laser and the camera, the digital signal processor can calculate the distance between the sensor and the measured object.

The CMOS imaging plane has a minimum unit of pixels. For example, a CMOS camera chip has a pixel pitch of 5.2 microns. There is a distance of 5.2 microns between the two pixels, which can be seen as connected in the macro view. But on the micro level, there are infinitely smaller things between them. This smaller thing we call subpixel. In fact, "subpixel" should exist, but there is no subtle sensor on the hardware to directly detect it, but it can accurately calculate 1 / 16-1 / 32 pixels.

TSINGBO high-precision HL series laser sensor adopts efficient and accurate sub-pixel algorithm, so its accuracy is 16-32 times better than that of ordinary displacement sensor without sub-pixel algorithm, and the minimum can reach 0.5 μ M.