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Coherent differential absorption lidar (dial)

  • US 7,397,568 B2
  • Filed: 09/08/2003
  • Issued: 07/08/2008
  • Est. Priority Date: 09/10/2002
  • Status: Active Grant
First Claim
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1. A coherent differential absorption lidar (DIAL) device comprising:

  • a transmit portion for directing a combined light beam, comprising at least two component light beams of discrete wavelengths, to a remote target and providing a local oscillator beam associated with each component light beam,a receive portion for receiving light returned from the remote target and for coherently mixing the received light with its associated local oscillator beam, anda signal correction means comprising;

    a means for extracting a portion of each component light beam from the transmit portion,a means for introducing a frequency difference between each extracted component light beam and its associated local oscillator beam anda means for directing each extracted component light beam into the receive portion.

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