Atomic resonance filter detector employing inert buffer gas

Details Atomic resonance filter detector employing inert buffer gas Atomic resonance filter detector employing inert buffer gas

1991-02-06

1992-08-04

Fields, Carolyn E.

Radiant energy

Luminophor irradiation

359886, G02B 520

Patent

active

051361680

ABSTRACT:
A method is provided in which the pulse stretching effects of radiation trapping can be minimized in atomic resonance filter detectors or QLORD filter detectors of the type described in U.S. Pat. No. 4,292,526. The QLORD detector of this invention which consists of two spectral bandpass filters, one each located on either side of a transparent cell containing an alkali metal vapor (preferably cesium vapor), and responds to an incoming pulse in the visible part of the spectrum of light (actually 420 to 480 nm), emitting a pulse of infrared light. If the transparent cell contains alkali metal vapor only, the infrared light pulse will be stretched, because of resonant trapping within the alkali metal vapor. However, in accordance with the present invention, an inert buffer gas (namely helium) is added to the alkali metal vapor. This buffer gas allows the rapid leakage of infrared light photons from the wings of the energy spectrum, and hence a more rapid response to the incoming pulse. The present invention is particularly useful in overcoming "false alarms" such as bioluminescence signals when pulse stretching and external noise sources are superimposed, and when a rapid pulse repetition rate is useful.

REFERENCES:
patent: 4292526 (1981-09-01), Marling
patent: 4829597 (1989-05-01), Gelbuachs

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