Coherent differential absorption lidar (dial)

Details Coherent differential absorption lidar (dial) Coherent differential absorption lidar (dial)

2008-07-08

2008-07-08

Lee, Hwa S (Department: 2886)

Optics: measuring and testing

By light interference

Having light beams of different frequencies

C356S437000

Reexamination Certificate

active

10527329

ABSTRACT:
A coherent differential absorption lidar (DIAL) device2comprises a transmit portion4for directing a combined light beam to a remote target and a receive portion5for receiving light returned from the remote target and for coherently mixing the received light with its associated local oscillator beam. The combined beam comprises at least two component light beams of discrete wavelengths. The device further comprises a signal correction means. The 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 difference62between each extracted component light beam and its associated local oscillator beam and a means for directing the extracted beam into the receive portion. This provides an additional correction signal thereby improving device performance.

REFERENCES:
patent: 5157257 (1992-10-01), Geiger
patent: 5767519 (1998-06-01), Gelbwachs
patent: 6621561 (2003-09-01), Holton
patent: 7349094 (2008-03-01), Harris et al.
Ridley, K.D. et al., “Improved speckle statistics in coherent differential absorption lidar with in-fiber wavelength multiplexing”, Applied Optics, Apr. 20, 2001, Opt. Soc. America, vol. 40, No. 12, pp. 2017-2023, XP002260851.
Richter, P.I. et al., “Field calibration and sensitivity analysis of coherent infrared differential absorption lidars”, IGARSS '96, 1996 International Geoscience and Remote Sensing Symposium, Remote Sensing for a Sustainable Future (Cat. No. 96CH35875), May 1996, pp. 697-699, vol. 1, SP002260923.
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