Comb filter pressure/temperature sensing system

Details Comb filter pressure/temperature sensing system Comb filter pressure/temperature sensing system

1988-02-24

1989-08-22

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250226, 250227, 356345, G01D 534

Patent

active

048598445

ABSTRACT:
A sensing system having a wideband optical source for providing optical illumination having a bandwidth of at least 25 nanometers, and an optical fiber cable for transmitting the optical illumination to a remote location. A transducer responsive to the transmitted optical illumination amplitude modulates the transmitted optical illumination as a function of a monitored physical parameter (for example, pressure or temperature) to provide an amplitude modulated optical illumination having generally sinusoidally varying nulls across the spectrum thereof, the frequency of the nulls varying across the spectrum of the modulated optical illumination and being a function of the monitored physical parameter. The fiber optic cable (or another fiber optic cable, depending on the transducer implementation) transmits the modulated optical illumination to an optical spectral analyzer which provides a spectrally dispersed optical signal indicative of the spectral content and amplitudes of the modulated optical illumination. A clocked detector array responsive to the spectrally dispersed optical signal is clocked at a varying clock rate to remove the frequency variation of the periodic nulls across the optical spectrum, so as to provide an electrical signal having a substantially constant frequency of the nulls. Narrowband filtering circuitry filters the electrical signal of substantially constant frequency to provide a filtered signal, and output circuitry responsive to the filtered signal provides an output signal indicative to the substantially constant frequency of the periodic nulls.

REFERENCES:
patent: 3668405 (1972-06-01), Brooks et al.
patent: 4408123 (1983-10-01), Sichling et al.
patent: 4446366 (1984-05-01), Brogardh et al.
patent: 4571080 (1986-02-01), Papuchon et al.
patent: 4668093 (1987-05-01), Cahill
patent: 4767210 (1988-08-01), Koshyap
patent: 4778988 (1988-10-01), Henderson

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