Method and apparatus for measuring meteorological visibility and

Details Method and apparatus for measuring meteorological visibility and Method and apparatus for measuring meteorological visibility and

1995-07-14

1996-04-02

Pham, Hoa Q.

Optics: measuring and testing

By particle light scattering

With photocell detection

356 506, 342 26, G01N 2100

Patent

active

055045774

ABSTRACT:
The invention concerns a method and device for measuring the meteorological visibility and the scattering of light. A light pulse is emitted into the atmosphere via an optical transmit system, the backscattered light returns via the optical transmit system after which its intensity and delay are measured. The waveform of the optical transmit pulse generated at the instant of its launching from within the apparatus is sensed in a manner that excludes any backscattered light originating from outside the measurement system, this signal is scaled for both its magnitude and phase so as to achieve a suitable feedback signal relative to the actual measurement signal and said feedback signal is subtracted from said measurement signal to avoid overloading of the receiver.

REFERENCES:
patent: 3430047 (1969-02-01), Hurkamp
patent: 4397549 (1983-08-01), Morgan
patent: 4605302 (1986-08-01), Lofgren et al.
patent: 4722599 (1988-02-01), Fruengel et al.
patent: 4931767 (1990-06-01), Albrecht et al.
patent: 5116124 (1992-05-01), Huttmann

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