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LASER LIGHT TRANSCEIVER AND LASER RADAR DEVICE

  • US 20170242100A1
  • Filed: 08/12/2014
  • Published: 08/24/2017
  • Est. Priority Date: 08/12/2014
  • Status: Active Grant
First Claim
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1. A laser radar device comprising:

  • a light source to output a laser light beam;

    a polarization changing unit to output said laser light beam toward a direction corresponding to polarization of said laser light beam while changing the polarization of said laser light beam outputted from said light source with respect to time;

    a first transmission and reception optical system to emit the laser light beam outputted from said polarization changing unit into space, and receiving a reflected light beam of said laser light beam, the reflected light beam being reflected by an observation target existing in the space;

    a second transmission and reception optical system disposed in a direction different from that in which said first transmission and reception optical system is disposed, to emit the laser light beam outputted from said polarization changing unit into the space, and receive a reflected light beam of said laser light beam, the reflected light beam being reflected by an observation target existing in the space;

    a reception optical system to receive the reflected light beam received by said first transmission and reception optical system, and also receive the reflected light beam received by said second transmission and reception optical system; and

    a heterodyne detecting unit to combine each of the reflected light beams received by said reception optical system, and a local light beam corresponding to the laser light beam outputted from said light source, to acquire beat signals,wherein said heterodyne detecting unit includes;

    a reflected light beam switching unit to output the reflected light beams received by said reception optical system toward directions corresponding to polarization directions of said reflected light beams;

    a local light beam switching unit to output the local light beam corresponding to the laser light beam toward a direction corresponding to polarization of said local light beam while changing the polarization of said local light beam outputted from said light source with respect to time;

    a first heterodyne detecting unit to combine one of the reflected light beams outputted from said reflected light beam switching unit and the local light beam outputted from said local light beam switching unit, to acquire a beat signal; and

    a second heterodyne detecting unit disposed in a direction different from that in which said first heterodyne detecting unit is disposed, to combine another of the reflected light beams outputted from said reflected light beam switching unit and the local light beam outputted from said local light beam switching unit, to acquire a beat signal.

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