Device for calibrating a transmissometer

Details Device for calibrating a transmissometer Device for calibrating a transmissometer

1975-03-10

1976-12-14

McGraw, Vincent P.

Optics: measuring and testing

Inspection of flaws or impurities

Bore inspection

356207, 356243, G01N 2122, G01N 2112

Patent

active

039972712

ABSTRACT:
This specification discloses a device for resetting the zero calibration of an opacity sensing meter (transmissometer) made up of a light source which may be located on one side of a smokestack, and a sensing element located on the other side of the smokestack. The rezeroing device will rezero the sensing element without using the light passing through the stack. The device samples the light at the source side of the stack by mechanically introducing an auxiliary light sensor, and generates an output from a mechanically introduced auxiliary source located on the sensor side of the stack such that excitation of the normal system sensor by the auxiliary source is the same as the excitation would be to the sensor by the normal source.

REFERENCES:
patent: 3234846 (1966-02-01), Cropper et al.
patent: 3702734 (1972-11-01), Lindahl et al.
patent: 3850529 (1974-11-01), Brugger

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