Laser ranging device and method

Abstract

The invention discloses a laser ranging device. The laser ranging device comprises a transmitting module, a receiving module and a control and processing circuit, wherein the transmitting module includes first light sources, a beam combining element and a second light source; the beam combining element couples light beams emitted by the first light sources together to form the second light sourceso as to emit a second light beam; the receiving module includes a pixel array composed of a plurality of pixels; and the control and processing circuit is used for synchronizing trigger signals of the transmitting module and the receiving module to calculate flight time required by the light beam from transmitting to receiving, and calculating a distance of a target object according to the flighttime. The plurality of first light sources are coupled together to form the second light source; and light energy and peak power of emitted light beams are increased, the emitted light beams have advantage of high peak power under a narrow pulse width, different scanning ranging modes are achieved in combination with a scanning element, and the laser ranging device can improve ranging precision and a ranging capacity at the same time.

Description

technical field [0001] The invention relates to the field of laser technology, in particular to a laser distance measuring device and method. Background technique [0002] Using the principle of time of flight (Time of Flight) and the principle of structured light, the distance measurement of the target can be carried out to obtain the depth image containing the depth value of the target, and further based on the depth image, functions such as 3D reconstruction, face recognition, and human-computer interaction can be realized. The distance measurement system has been widely used in consumer electronics, unmanned driving, AR / VR and other fields. Among them, the laser ranging device based on the time-of-flight principle usually includes a laser and a sensor. The laser emits a pulsed beam to irradiate the target field of view and uses the sensor to collect the reflected beam, and calculates the time required for the beam to be received from the launch to the reflection. Accordi...

AI Technical Summary

Problems solved by technology

Among them, the higher the peak power of the laser, the farther the detectable distance is; and the narrow pulse width can improve the timing accuracy, but when the pulse width is reduced to a certain extent, the peak power will be weakened, so it is difficult to take into account the distance measurement accuracy and measurement accuracy at the same time. Distance ability

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