Radiant energy – Invisible radiant energy responsive electric signalling
Patent
1990-09-21
1992-05-05
Fields, Carolyn E.
Radiant energy
Invisible radiant energy responsive electric signalling
359189, 250374, H04B 1006
Patent
active
051110474
ABSTRACT:
Apparatus and a related method for detecting signal photons of a selected wavelength using ionization induced by collisions between atomic or molecular particles. Signal photons raise the energy level of a proportion of particles introduced into a detection chamber to a selected metastable state. Optionally, a pump laser assists in raising the energy level of the particles to a metastable state close to the ionization continuum. Collisions between particles in the selected metastable state and particles of the buffer gas cause ionization of the metastable particles, and a measurable electrical current is obtained, without the need for strong electric fields for ionization, or the need for strong optical fields for photoionization. In a variant form of the invention, a second substance is admitted into the detection chamber. Collisions between the original atomic or molecular particles and particles of the second substance cause ionization of the second substance, again providing a measurable electric current from the free electrons or ions that are produced.
REFERENCES:
patent: 4829597 (1989-05-01), Gelbwachs
patent: 4879468 (1989-11-01), Brock
patent: 4986655 (1991-01-01), Sweeney
Fields Carolyn E.
Goldstein Sol L.
Heal Noel F.
TRW Inc.
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