Radiant energy – Invisible radiant energy responsive electric signalling
Patent
1979-06-27
1981-09-01
Smith, Alfred E.
Radiant energy
Invisible radiant energy responsive electric signalling
250338, G01J 100
Patent
active
042874181
ABSTRACT:
A method for measuring the spectral distribution of electromagnetic radiation intensity, wherein the spectral distribution of electromagnetic radiation intensity is converted to an electric signal by means of a direct integral Hilbert transform in superconducting weak links. The electric signal as a function of a direct integral Hilbert transform parameter is measured, and the desired spectral distribution of electromagnetic radiation intensity is determined by applying an inverse integral Hilbert transform to the measured function. A spectrometer of millimeter and far-infrared ranges for effecting the above method is provided for determining the frequency spectrum of microwave or infrared radiation signals. The radiation to be measured is modulated, with the modulated signal coupled to a receiver to which a variable scanning voltage is applied by a control unit, the value of the scanning voltage being proportional to a Hilbert transform parameter. The output of the receiver is coupled to a phase detector, to which a reference signal is applied from the modulator; the output of the phase detector is a direct Hilbert transform of the spectral distribution of the input signal (when the Hilbert transform parameter-representing voltage applied to the receiver is scanned through the entire frequency range of the input signal). The spectral distribution is then obtained by deriving the inverse integral Hilbert transform of the output of the phase detector.
REFERENCES:
patent: 3124745 (1964-03-01), Schroeder
patent: 3466431 (1969-09-01), Fuchs et al.
patent: 3800131 (1974-03-01), White
patent: 4093989 (1978-06-01), Flink et al.
Belenov, E. M. et al., "Data Transmission in the Far Infrared Range", Sov. J. Quantum Electron, 9(11) Nov. 1979, 1478-1479.
Divin Jury Y.
Polyansky Oleg J.
Shulman Alexandr Y.
Howell Janice A.
Smith Alfred E.
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