Electromagnetic wave detecting apparatus

Radiant energy – Invisible radiant energy responsive electric signalling – Including a radiant energy responsive gas discharge device

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2503361, 2503381, 25033901, 2503851, G01J 510

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active

054632269

ABSTRACT:
A miniaturized electromagnetic wave detecting apparatus is provided that detects wavelengths from the microwave to the infrared regions in any environment. Electrons are field-emitted from an electron emitting means comprising a cold cathode and a gate electrode 2. Spiral motion and elongation of traveling length of the emitted electrons are enhanced by orthogonal magnetic field applied by a magnetic field application means while the electrons are attracted to the anode. The electrons are accelerated by the cyclotron resonance enhanced when the angular cyclotron resonance frequency .omega..sub.c, determined by the magnetic flux density of the orthogonal magnetic field, and the angular frequency .omega..sub.f of the electromagnetic wave to be measured coincide with each other. The accelerated electrons collide with and dissociate the dilute gas molecules to produce multiplied ion-pairs, which are then captured by the cathode and anode. The wavelength of the electromagnetic wave is measured from the angular frequency .omega..sub.c of the cyclotron resonance by detecting the anode current peak observed when the cyclotron resonance is enhanced.

REFERENCES:
patent: 4952811 (1990-08-01), Elliott
J. Appl. Phys., vol. 47, No. 12, "Physical Properties of thin-film field emission cathodes with molybdenum cones", Spindt et al., pp. 5248-5263 (1976).
J. Japanese Appl. Phys. vol. 59, No. 41, pp. 164-169 (1990).

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