Calibration system for a photo multiplier tube

Details Calibration system for a photo multiplier tube Calibration system for a photo multiplier tube

1995-11-22

1998-02-03

Font, Frank G.

Optics: measuring and testing

Photometers

Comparison

356230, G01J 110, G01J 112

Patent

active

057150486

ABSTRACT:
A calibration system for a measuring device utilizing a photo multiplier tube is provided. The calibration system is intended to provide a stable light source variable over a wide range of intensities which can be used to calibrate the PMT reading using a closed loop feedback circuit. The LED and a photo cell are disposed in a reference block chamber whereby the photo cell is in close proximity disposed perpendicular to the axis of the LED. The LED being dome shaped will direct light energy on to the photo cell, and also peripherally. The PMT is disposed adjacent the LED and at an angle to its longitudinal axis whereby light generated by the PMT simultaneously strikes both the photo cell and the PMT without reflection.

REFERENCES:
patent: 3670202 (1972-06-01), Paine et al.
patent: 5401465 (1995-03-01), Smethers et al.

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