Erbium laser ceilometer

Details Erbium laser ceilometer Erbium laser ceilometer

G - Physics

01

C

343/6, 343/9

G01C 3/08 (2006.01) G01S 17/95 (2006.01) G01W 1/00 (2006.01)

Patent

CA 1041198

ERBIUM LASER CEILOMETER ABSTRACT OF THE DISCLOSURE A laser rangefinder for clouds, fog, haze and precipita- tion including an erbium doped laser transmitter, a germanium photodiode monitor and a germanium avalanche photodiode detector. The germanium avalanche photodiode and an amplifier module is positioned at the focus of a parabolic reflector. The transmitter transmits light in a waveband with an optical center at 1.54 microns and is eye safe. A periscope system aligns the outgoing pulse with the returning light to reduce parallax. To reduce alignment problems when shifts in wavelengths occur, an optical circuit with only reflecting surfaces can be employed. To increase the efficiency of the laser transmitter, the lamps utilized to position the laser rod within the cavity are formed of the same material as the laser rod and the pump light reflector is a second surface mirror with a quartz substrate coated in succession with silver, copper and black paint. -1-

226544

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