Apparatus for detecting fluorescence of a luminescent material

Details Apparatus for detecting fluorescence of a luminescent material Apparatus for detecting fluorescence of a luminescent material

1990-04-27

1991-11-05

Westin, Edward P.

Radiant energy

Luminophor irradiation

2504611, G01J 158

Patent

active

050632973

ABSTRACT:
An apparatus for detecting the fluorescence of a luminescent material. Photo-semiconductors receiving the visible fluorescence from a target luminescent material and directly from a discharge lamp are electrically coupled to oppose each other resulting in a single-channel detector inherently balanced and insensitive to variations in the excitation stimulus. The photo-semiconductor output is sent through a second harmonic amplifier making available a phase detection of the fluorescence instead of an amplitude detection. The phase of the signal is compared with a known phase from the excitation power source. By adding signals that either reinforce or oppose, the phase information is converted back to amplitude information at a voltage level that can be easily detected. The compared output then triggers an indicator producing an indication of the amount of fluorescence of the target luminescent material.

REFERENCES:
patent: 4945245 (1990-07-01), Levin

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