Radiation sensor with photo-thermal gain

Details Radiation sensor with photo-thermal gain Radiation sensor with photo-thermal gain

2005-05-03

2005-05-03

Porta, David (Department: 2878)

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

C250S336100, C250S330000, C250S332000, C250S338300

Reexamination Certificate

active

06888141

ABSTRACT:
A thermal sensor for low level radiation with built-in photo-thermal gain utilizing a thin film of pyro-optical material to modulate the reflectivity and/or transmission of a photonic carrier beam. The photonic carrier beam is modulated by the temperature of the pyro-optical film and detected by typically a silicon detector. A slight temperature increase of the pyro-optical film due to absorption of low level radiation increases the coefficient of absorption of the photonic carrier beam which in turn causes a further increase in temperature of the pyro-optical film. The photonic carrier beam provides power to increase the temperature of the pyro-optical film beyond the heating caused by the absorption of low level radiation alone. This thermal amplification effect provides a radiation sensor with photo-thermal gain.

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patent: 5602043 (1997-02-01), Beratan et al.
patent: 6323486 (2001-11-01), Grossman et al.
patent: 6770882 (2004-08-01), Carr et al.

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