Eye-safe laser triangulation measurement system

1. An eye-safe laser triangulation measurement system, comprising:

a laser transmitter;

an optical projection apparatus;

a laser beam capturing unit;

a cooperation unit; and

an image processing apparatus, wherein

the laser transmitter is configured to generate point pulse laser of a pulse laser beam;

the optical projection apparatus is disposed at a front end of the laser transmitter, and is configured to convert the point pulse laser into a line laser;

the laser beam capturing unit is configured to capture reflected light obtained by the line laser at a target position to obtain a laser image;

the cooperation unit is configured to control on and off of the laser transmitter, and control capture of the laser beam capturing unit; and

the image processing apparatus is configured to perform 3D modeling on the laser image to obtain a distance to the target position;

wherein the laser transmitter comprises a laser diode, a constant current source, and a protective circuit, wherein

the constant current source receives triggering by a trigger signal of the cooperation unit and turns off after a turn-on time T on ;

when the constant current source is within the turn-on time, the laser diode generates the point pulse laser; and

the protective circuit is configured to control the turn-on time T on to be less than a predetermined threshold.

2. The eye-safe laser triangulation measurement system according to claim 1 , wherein

the laser beam capturing unit is a photographic camera, and a narrowband bandpass filter is provided at a front end of a camera of the photographic camera; and

a central wavelength of the narrowband bandpass filter is the same as a wavelength of laser emitted by the laser transmitter, the narrowband bandpass filter being capable of filtering out effects of most natural light on the system.

3. The eye-safe laser triangulation measurement system according to claim 2 , wherein

the cooperation unit generates a pulse control signal to control opening and closing of a shutter of the photographic camera, and control on and off of the laser transmitter;

a laser transmitter generates laser according to a switching interval of the shutter of the photographic camera, so that every two times the shutter is opened, the laser transmitter generates laser; and

because a time interval between pulse control signals is short, a background difference between two consecutive laser images is small, and laser point pixels can be extracted from background pixels by comparing the two consecutive laser images.

4. The eye-safe laser triangulation measurement system according to claim 1 , wherein the image processing apparatus further performs filtering processing and laser line extraction on the laser image, and performs 3D modeling on the extracted laser line.

5. The eye-safe laser triangulation measurement system according to claim 1 , wherein the protective circuit controls the turn-on time Ton to be less than 50 μs by using a timer timing manner and a hardware circuit timing manner.

6. The eye-safe laser triangulation measurement system according to claim 1 , wherein an output power of the laser diode is 200 mW.