Vaisala Oy

Dräger Safety Ag&co. Kgaa

Horst Huttmann

Jan Lonnqvist

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.

Method and apparatus for measuring meteorological visibility and

This invention concerns an apparatus for the measurement of the parameters of atmospheric visibility or optical density. The apparatus includes a transmitter with which light operating as the measurement signal can be emitted to the measured space; a receiver with which light backscattered from the measured space can be received; and an information processor with which the information of light received by the receiver can be processed and interpreted. According to the invention the active surfaces of the transmitter and receiver means are aligned along an at least essentially same optical axis.

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Uetersen, Germany

Horst Huttmann