SERIAL WEAK FBG INTERROGATOR
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Accused Products
Abstract
A serial weak FBG interrogator is disclosed. The serial weak FBG interrogator may include a CW tunable laser or pulsed laser utilized as a laser source and an EDFA. The serial weak FBG interrogator may also be an interrogation of a single sensor system by utilization of a DFB laser which utilizes a single sensor, which may be an interferometer sensor, an extrinsic Fabry-Perot interferometer or a wavelength-modulated sensor. The serial weak FBG interrogator may also include a computer system or CSPU.
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Citations
49 Claims
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1-28. -28. (canceled)
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29. An interrogation system using a laser to interrogate at least one sensor, said interrogation system comprising:
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at least one sensor capable of reflecting or transmitting light from said laser; an optical fiber extending from the at least one sensor; and a sensor interrogator receiving the optical fiber extending from the at least one sensor, wherein the sensor interrogator includes the laser, a laser calibrator comprising a first photodetector and a first amplifier, and wherein said sensor interrogator further comprises a second photodetector receiving reflected laser output from said sensor, a second amplifier, an A/D converter responsive to said first amplifier and said second amplifier and a microprocessor responsive to said A/D converter for determining a spectrum of said from said laser reflected or transmitted by said sensor. - View Dependent Claims (30, 31, 32, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 48, 49)
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- 33. (canceled)
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47. A sensor interrogator for interrogating one or more optical sensors having a variable length optical path difference responsive to a variable parameter to be measured, said interrogator comprising:
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a laser; a laser calibrator comprising a first photodetector and a first amplifier; a second photodetector receiving reflected laser output from said sensors over an optical fiber; a second amplifier; an A/D converter responsive to said first amplifier and said second amplifier; and a microprocessor responsive to said A/D converter for determining a spectrum of said from said laser reflected or transmitted by said sensor.
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Specification