Cloud height measuring device with compensation for window fouli

Details Cloud height measuring device with compensation for window fouli Cloud height measuring device with compensation for window fouli

1984-04-16

1986-08-12

Buczinski, Stephen C.

Optics: measuring and testing

Range or remote distance finding

With photodetection

356 4, G01C 308

Patent

active

046053026

ABSTRACT:
In a cloud height measuring device, the attenuation caused by deposits on the output and/or receiver windows of the device (e.g. by rain and/or dirt) are compensated for by measuring the degree of reflection of light from the window(s) when illuminated by light pulses. By means of a special measuring sequence in a processor unit included in the cloud height measuring device, light pulses separate from those used for the cloud height measurement itself, can be employed to assess the extent of the fouling. The measurement energy can then be controlled during the cloud height measurement proper, so that the total attenuation, caused by rain and dirt on the windows, is properly compensated for.

REFERENCES:
patent: 3741655 (1973-06-01), Ling et al.
patent: 3815994 (1974-06-01), Peekham
patent: 3947131 (1976-03-01), Karl
patent: 4121889 (1979-10-01), Soderstrom
Ludbrook and Winstanley, "The Laser Ceilometer," Systems Technology, Jun. 1977, No. 26.

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