The first thing you need to confirm is what kind of laser you will use and where. .

Generally speaking, the laser with spot shaping will have several spots to choose from, that is, points, straight lines and crosshairs, which are often used for position marking.

If you want to determine the position of the light spot through the sensor, you will generally use a point laser, and the corresponding detector has PSD (position

sensor

Detector)

and

Quiet plasma (quiet plasma)

(Quadrant

Photodiode), under the assumption of uniform distribution of spot energy, if the geometric center of spot energy is to be determined, QP detection is generally adopted; If the spot position is detected under the condition of small spot, PSD is generally used, which can be divided into one-dimensional PSD and two-dimensional PSD.

I hope this reply is helpful to you.