Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1997-12-12
2000-02-08
Hannaher, Constantine
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
2503383, G01J 524
Patent
active
060230622
ABSTRACT:
A method and apparatus for converting infra-red radiation into electrical signals having a higher effective amplification is provided. This is accomplished by the steps of: (1) allowing the infra-red radiation of a properly chosen modulation frequency to reach a ferroelectric TGS crystal coupled to a nonlinear dynamic system such as a nonlinear series resonance circuit; (2) varying the amplitude and frequency of the driving voltage of the circuit, or the temperature of the ferroelectric crystal; (3) stabilizing the nonlinear dynamic circuit near a dynamic instability point, and particularly a period doubling bifurcation point, by adjusting the amplitude and frequency of the driving voltage or the temperature of the crystal, so the selected modulation frequency of the infra-red radiation is half the driving frequency of the nonlinear dynamic system, and (4) measuring the electrical signal produced by the ferroelectric crystal and amplified in the nonlinear dynamic system near its dynamic instability point.
REFERENCES:
M. Diestelhorst (Martin-Luther-Universitat, . . . ), "Nichtlineares Verhalten im ferroelektrischen TGS", 15 Fruhjahrsschule Ferroelektrizitat in Fincken 1987, Martin-Luther-Universitat WB 1987/67 (024), pp. 68-77.
Kurt Wiesenfeld et al, "Small-signal amplification in bifurcating dynamical systems", Physical Review A, vol. 33, No. 1, Jan. 1986.
Hannaher Constantine
Israel Andrew
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