Laser radar
A laser radar, comprising: a laser ( 10 ): used for emitting a laser light beam; a probe ( 20 ): used for receiving the reflected laser light beam; and a set of transceiver structures ( 30 ): used for receiving the laser light beam emitted along a preset direction and conveying the laser light beam to the probe ( 20 ), the transceiver structures ( 30 ) being arranged coaxially with the laser ( 10 ), the transceiver structures ( 30 ) comprising a vertical field of view adjustment unit, and the vertical field of view adjustment unit making the laser light beam have a non-uniform distribution in the vertical field of view range and/or adjusting the vertical field of view range of the laser.
1. A laser radar, characterized in that it comprises:
A laser: used for emitting a laser beam;
A detector: used for receiving the reflected laser beam;
A set of transceiver structures: used for receiving said laser beams emitted in the preset direction and transmitting said laser beams to the detector; said transceiver structures are coaxial with said laser and include a vertical field of view adjustment unit; said vertical field of view adjustment unit distributes said laser beams non-uniformly in the vertical field of view and/or adjusts the vertical field of view of said laser beams.
2. A laser radar according to claim 1 , characterized in that the non-uniform distribution of said laser beams in the vertical field of view comprises said vertical field of view adjustment unit increasing the distribution density of said laser beams in a specific exiting direction.
3. A laser radar according to claim 2 , characterized in that said vertical field of view adjustment unit deflects said laser beams by oscillating;
in a specific exit direction, the increase in the distribution density of said laser beams by said vertical field of view adjustment unit comprises when said laser beams move towards the center of the vertical field of view, the frequency of oscillation of said vertical field of view adjustment unit increases; when said laser beams move away from the center of the vertical field of view, the frequency of oscillation of said vertical field of view adjustment unit decreases.
4. A laser radar according to claim 1 , characterized in that said vertical field of view adjustment unit deflects said laser beams by oscillating;
the adjustment of the vertical field of view of said laser beams comprises the amplitude of oscillation of said vertical field of view adjustment unit increasing when the preset vertical field of view increases or the amplitude of oscillation of said vertical field of view adjustment unit decreasing when the preset vertical field of view decreases.
5. A laser radar according to claim 1 , characterized in that said vertical field of view adjustment unit deflects said laser beams by oscillating, the oscillation of said vertical field of view adjustment unit is driven by a driving signal, said driving signal is encoded in the time domain, and the oscillation of said vertical field of view adjustment unit driven by said coded driving signal is temporally sequential.
6. A laser radar according to claim 5 , characterized in that the frequency and amplitude of the temporally sequential oscillation of said vertical field of view adjustment unit are non-uniform in the temporal sequence.
7. A laser radar according to claim 1 , characterized in that said vertical field of view adjustment unit deflects said laser beams by oscillating, and said laser adjusts the output energy of laser pulses according to the sensed oscillation of said vertical field of view adjustment unit:
when said laser senses that the laser beam deflected by the oscillation of said vertical field of view adjustment unit is moving towards the center of the vertical field of view, the output energy of pulses emitted by said laser increases;
when the laser senses that the laser beam deflected by the oscillation of said vertical field of view adjustment unit is moving away from the center of the vertical field of view, the output energy of pulses emitted by said laser decreases.
8. A laser radar according to claim 1 , characterized in that said vertical field of view adjustment unit deflects said laser beams by oscillating, and said laser adjusts the output frequency of laser pulses according to the sensed oscillation of said vertical field of view adjustment unit:
when said laser senses that the laser beam deflected by said oscillation of the vertical field of view adjustment unit is moving towards the center of the vertical field of view, the output frequency of pulses emitted by said laser increases;
when said laser senses that the laser beam deflected by the oscillation of said vertical field of view adjustment unit is moving away from the center of the vertical field of view, the output frequency of pulses emitted by said laser decreases.
9. A laser radar according to any of claims 1 to 8 , characterized in that said transceiver structures also include a mirror; said mirror includes the body of the mirror and an aperture; said aperture is coaxial with said laser; said mirror is placed at the near end of said transceiver structures relative to said laser; and said vertical field of view adjustment unit is placed at the far end of said transceiver structures relative to said laser;
alternatively, said transceiver structures also include a polarizing beam splitter and a quarter-wave plate; said polarizing beam splitter is placed at the near end of said transceiver structures relative to said laser; said vertical field of view adjustment unit is placed at the far end of said transceiver structures relative to said laser; and said quarter-wave plate is placed between said polarizing beam splitter and said vertical field of view adjustment unit.
10. A laser radar according to claim 1 , characterized in that a one-dimensional mirror galvanometer or two-dimensional mirror galvanometer is used as said vertical field of view adjustment unit;
the detector uses an avalanche photodiode.