Self-equalizing industrial photometer

Details Self-equalizing industrial photometer Self-equalizing industrial photometer

1973-06-20

1976-01-13

McGraw, Vincent P.

Optics: measuring and testing

Inspection of flaws or impurities

Bore inspection

250264, 250573, 356218, G01N 2126

Patent

active

039320405

ABSTRACT:
The industrial photometer consists in principle of an optical single-beam measuring arrangement with the gas (or liquid) to be investigated flowing through the measuring cell. The detector behind the measuring cell consists of a photoelectric receiver which is connected to a working resistor with a remote-controlled voltage tap. A highly constant counter voltage is connected in series with the photovoltage. The measuring cell is filled at preselected time intervals with an absorption-free zero substance (standard substance), and the difference between the photovoltage and the constant voltage is automatically equalised to zero. After equalisation, the zero substance is again replaced by the measuring gas or liquid. The voltage difference then measured is a measure of the concentration to be determined.

REFERENCES:
patent: 3622795 (1971-11-01), Dorman et al.

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