Comb filter pressure temperature sensor

Details Comb filter pressure temperature sensor Comb filter pressure temperature sensor

G - Physics

01

D

325/1, 73/53

G01D 5/26 (2006.01) G01D 5/353 (2006.01)

Patent

CA 1292777

COMB FILTER PRESSURE/TEMPERATURE SENSING SYSTEM ABSTRACT OF THE DISCLOSURE 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 loca- tion. A transducer responsive to the transmitted optical illumination amplitude modulates the transmitted optical illumination as a function of a monitored physical para- meter (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 illumina- tion 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 pro- vides an output signal indicative to the substantially constant frequency of the periodic nulls.

591807

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