Patent ID: 6052179
Filing Date: 2000-04-18
Classification: G01D

Abstract:
A system comprising:(A) a sensor, the sensor having an output with a wavelength which varies in accordance with a parameter sensed by the sensor;(B) a filter, the filter filtering the output of the sensor, to produce a filtered output the filter being formed of a fiber grating recorded in an optical fiber, the fiber grating having a modulated index of refraction with (1) a modulation amplitude that substantially varies from a first end to a second end of the fiber grating, and (2) a modulation period defined by a grating constant that substantially varies from the first end to the second end of the fiber grating;(C) a photodetector, the photodetector being optically coupled to the sensor by way of the filter and the optical fiber, the photodetector detecting the filtered output of the sensor, and the photodetector having an output which varies in accordance with light intensity detected by the photodetector; and(D) a signal processing unit, the signal processing unit being coupled to the photodetector, and the signal processing unit determining the wavelength of the output of the sensor based on the output of the photodetector.