Optical apparatus for measuring transmission or absorption along

Details Optical apparatus for measuring transmission or absorption along Optical apparatus for measuring transmission or absorption along

1981-06-04

1984-02-21

Rosenberger, R. A.

Optics: measuring and testing

For light transmission or absorption

Of fluent material

250573, G01N 2159

Patent

active

044326491

ABSTRACT:
A light transmitter transmits a beam of light along a measurement path to a light receiver which receives the light beam either directly or via a retro-reflector. The light receiver forms electrical signals representative of the transmission or absorption along the measurement path. In an arrangement with separate light transmitter and receiver units these units are arranged in respective housings at each end of the measurement path. In an alternative arrangement in which the light transmitter and receiver are in a single unit a retro-reflector is positioned at the other end of the measurement path. In this alternative arrangement the light transmitter/receiver unit is embodied in one housing and the retro-reflector in a second housing. In either arrangement both housings are sealingly closed by at least one and preferably two windows which can be moved cyclically into and out of the light beam. The transmission or absorption along the measurement path is calculated from the signals in such a way that the measured absorption is independent of the prevailing level of contamination. The apparatus is particularly useful for transmission measurements in chimneys and on airfields.

REFERENCES:
patent: 3251999 (1966-05-01), Middleton et al.
patent: 3838925 (1974-10-01), Marks
patent: 3885162 (1975-05-01), Geertz
patent: 3949234 (1976-04-01), Vandermark
patent: 4247205 (1981-01-01), Typpo

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