Misalignment detection apparatus for transmissiometer with under

Details Misalignment detection apparatus for transmissiometer with under Misalignment detection apparatus for transmissiometer with under

1993-07-06

1995-04-04

McGraw, Vincent P.

Optics: measuring and testing

For light transmission or absorption

Of fluent material

250573, 356437, 356439, G01N 2159

Patent

active

054042283

ABSTRACT:
In accordance with this invention, a misalignment detector apparatus is provided for a transmissometer with an underfilled reflector. The transmissometer has a transceiver that projects a collimated beam of light of small diameter across a smokestack to a circular reflector of substantially greater diameter than the collimated beam of light so that the reflector is underfilled. The reflector includes apparatus for sensing the position of the collimated beam of light with respect to the center of the reflector and its position on the reflector when it is not on center which allows operator notification of when the beam is on the reflector and when the beam is off the reflector thereby requiring maintenance/realignment.

REFERENCES:
patent: 5028790 (1991-07-01), McGowan et al.

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