Sensor and Disturbance Measurement Method Using the Same
First Claim
1. A sensor comprising:
- a laser light source emitting a laser light with a predetermined wavelength;
a sensor section including at least first and second waveguides each transmitting part of the laser light from said laser light source therethrough, said sensor section having structure such that spectra of Brillouin scattering light, outputted in said first and second waveguides, change in different manners respectively when a disturbance is applied thereto;
a detecting section detecting the spectra of Brillouin scattering light that is outputted from said first and second waveguides respectively in response to the input of the laser light; and
an analyzing section determining a measurement value of at least one of a temperature in said sensor section and a strain generated in said sensor section under the effect of disturbance, based on fluctuations of parameters defining the respective spectra of Brillouin scattering light from said first and second waveguides detected by said detecting section.
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Accused Products
Abstract
The present invention relates to a sensor or the like having a structure that enables accurate temperature measurement in a wide temperature range including a low-temperature region and is suitable for independently and accurately determining temperature variations and strains appearing in an object to be measured. The sensor comprises a laser light source, a sensor section that has a plurality of waveguides transmitting a laser light from the laser light source therethrough, a detecting section, and an analyzing section. The detecting section detects a plurality of Brillouin spectra obtained from the sensor section. The analyzing section determines at least one measurement value of a temperature in the sensor section and a strain generated in the sensor section, based on fluctuations of parameters defining the respective detected Brillouin spectra. In particular, the sensor section has a structure such that the variation of the Brillouin spectrum in response to a disturbance differs between the waveguides. Thus, by simultaneously monitoring the Brillouin spectra that varying a different manner in a plurality of waveguides, it is possible not only to measure accurately the temperature in a wide temperature range including a low-temperature region, but also to make distinction between the strain and temperature.
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Citations
19 Claims
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1. A sensor comprising:
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a laser light source emitting a laser light with a predetermined wavelength;
a sensor section including at least first and second waveguides each transmitting part of the laser light from said laser light source therethrough, said sensor section having structure such that spectra of Brillouin scattering light, outputted in said first and second waveguides, change in different manners respectively when a disturbance is applied thereto;
a detecting section detecting the spectra of Brillouin scattering light that is outputted from said first and second waveguides respectively in response to the input of the laser light; and
an analyzing section determining a measurement value of at least one of a temperature in said sensor section and a strain generated in said sensor section under the effect of disturbance, based on fluctuations of parameters defining the respective spectra of Brillouin scattering light from said first and second waveguides detected by said detecting section. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification