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MEASUREMENT DEVICE AND SENSOR SYSTEM

Foreign code F160008827
File No. (S2015-0129-N0)
Posted date Aug 10, 2016
Country WIPO
International application number 2015JP082318
International publication number WO 2016080415
Date of international filing Nov 17, 2015
Date of international publication May 26, 2016
Priority data
  • P2014-232898 (Nov 17, 2014) JP
  • P2014-245101 (Dec 3, 2014) JP
Title MEASUREMENT DEVICE AND SENSOR SYSTEM
Abstract The present invention provides a measurement device that uses stimulated Brillouin scattered light, said device not requiring linear frequency sweeping. Provided is a measurement device that measures the gain spectrum of stimulated Brillouin scattered light in an object to be measured, said device being provided with: a first comb light generator that generates a first comb light and inputs said light to one end of the object to be measured; a second comb light generator that generates a second comb light of which the reference frequency is shifted, relative to the first comb light, only by the Brillouin shift frequency of the object to be measured, and which has a different frequency interval, and inputs the second comb light to the other end of the object to be measured; and a measuring apparatus that measures the spectrum of the stimulated Brillouin scattered light output from the object to be measured.
Scope of claims [claim1]
1. Targeting suffering measurement the COM illuminant which two COM lights where frequency interval differs incidence is done and,
The test section which measures the light which is output from the aforementioned suffering measuring object
It has
Measurement equipment.
[claim2]
2. Being the measurement equipment which measures the profit spectrum of the induced Brillouin scattering light in the aforementioned suffering measuring object,
As for the aforementioned COM illuminant,
Forming 1st COM light, the 1st COM optical generator which it inputs into one end of the aforementioned suffering measuring object and,
Vis-a-vis the aforementioned 1st COM light, reference frequency has shifted just Brillouin shift frequency of the aforementioned suffering measuring object, at the same time, forming the 2nd COM light where frequency interval differs, other than the aforementioned suffering measuring object the 2nd COM optical generator which is input into the edge
Possessing,
As for the aforementioned test section,
It is the measurement equipment which measures the spectrum of the induced Brillouin scattering light which is output from the aforementioned suffering measuring object
In claim 1 measurement equipment of statement.
[claim3]
3. The aforementioned 1st COM light and reference frequency are identical, at the same time, the 3rd COM optical generator which forms the 3rd COM light where frequency interval differs furthermore having,
The aforementioned measurement equipment measures the beat signal of the aforementioned induced Brillouin scattering light and the aforementioned 3rd COM light
In claim 2 measurement equipment of statement.
[claim4]
4. The aforementioned 1st COM optical generator, the aforementioned 2nd COM optical generator and the aforementioned 3rd COM optical generator, on the basis of the laser light of the single wave length which is formed from the identical kind illuminant, form the respective aforementioned 1st COM light, the aforementioned 2nd COM light and the aforementioned 3rd COM light
In claim 3 measurement equipment of statement.
[claim5]
5. As for the aforementioned 1st COM optical generator, the ripple mark in the time base forms the aforementioned 1st COM light of pulse condition, as for the aforementioned 2nd COM optical generator, the ripple mark in the time base forms the aforementioned 2nd COM light of pulse condition
In one section measurement equipment of statement from claim 2 either of 4.
[claim6]
6. The 1st pulse modulator which adjusts the period between the pulse groups of 2 or more where pulse of 2 or more of the aforementioned 1st COM light is included respectively and,
The 2nd pulse modulator which adjusts the period between the pulse groups of 2 or more where pulse of 2 or more of the aforementioned 2nd COM light is included respectively
Furthermore in the claim 5 which it has the measurement equipment of statement.
[claim7]
7. As for the aforementioned 1st pulse modulator and the aforementioned 2nd pulse modulator, period between the pulse groups of the aforementioned 2 or more of the aforementioned 1st COM light and period between the pulse groups of the aforementioned 2 or more of the aforementioned 2nd COM light uncommonness being able to train, consecutively it changes the position in the aforementioned suffering measuring object where are piled up with the pulse group of the aforementioned 1st COM light and the pulse group of the aforementioned 2nd COM light,
As for the aforementioned measurement equipment, distribution of the spectrum of the aforementioned induced Brillouin scattering light in each position of the aforementioned suffering measuring object is measured
In claim 6 measurement equipment of statement.
[claim8]
8. The description above 1st COM light and the description above 2nd difference of frequency interval of COM light is smaller than width of the Brillouin profit spectrum of the aforementioned suffering measuring object
In one section measurement equipment of statement from claim 2 either of 7.
[claim9]
9. The description above 1st COM light and the description above 2nd frequency interval of COM light in each case is larger than 2 times that width of the Brillouin profit spectrum of the aforementioned suffering measuring object
In one section measurement equipment of statement from claim 2 either of 8.
[claim10]
10. As for the aforementioned suffering measuring object, it possesses with the 1st optical fiber and the 2nd optical fiber which are used in order to measure the distortion change and temperature variation of the aforementioned suffering measuring object
In one section measurement equipment of statement from claim 1 either of 9.
[claim11]
11. From claim 1 either of 10 in one section measurement equipment of statement and,
The aforementioned suffering measuring object
The sensor system which it has.
[claim12]
12. Same period it does the aforementioned COM illuminant, mutually, at the same time, the 1st COM light where frequency interval differs and possessing the dual COM illuminant which forms 2nd COM light,
The aforementioned suffering measuring object has the reflected point of 1 or more where spectral characteristics change with around environment, the aforementioned 1st COM light and the aforementioned 2nd COM light are the optical fiber which incidence is done,
The aforementioned test section is the measurement equipment which measures the beat signal of the aforementioned 1st COM light and the aforementioned 2nd COM light which from the reflected point of the aforementioned 1 or more it was reflected or were transmitted, or,
Functioning it does the aforementioned measurement equipment, as multi point type optical fiber sensors
In claim 1 measurement equipment of statement.
[claim13]
13. The reflected point of the aforementioned 1 or more is fiber Bragg grating of 1 or more, in claim 12 the measurement equipment of statement.
[claim14]
14. Each reflected bandwidth of fiber Bragg grating of the aforementioned 1 or more has the width where plural frequency peaks of the aforementioned 1st COM light are settled, in claim 13 the measurement equipment of statement.
[claim15]
15. As for the aforementioned 1st COM light and the aforementioned 2nd COM light,
The frequency peak which is reflected in 1st fiber Bragg grating and,
The aforementioned 1st fiber Bragg grating the frequency peak which is reflected in the 2nd fiber Bragg grating which differs
It possesses, in claim 13 or 14 the measurement equipment of statement.
[claim16]
16. In each of fiber Bragg grating of the aforementioned 1 or more, as for center frequency of the frequency spectrum of reflected light mutually differing,
Fiber Bragg grating of the aforementioned 1 or more, as the aforementioned 1st COM light leaves from the position where incidence it does, in order for the aforementioned center frequency to become large, is arranged in the aforementioned optical fiber, in one section the measurement equipment of statement from claim 13 either of 15.
[claim17]
17. In each of fiber Bragg grating of the aforementioned 1 or more, as for center frequency of the frequency spectrum of reflected light mutually differing,
Fiber Bragg grating of the aforementioned 1 or more, as the aforementioned 1st COM light leaves from the position where incidence it does, in order for the aforementioned center frequency to become small, is arranged in the aforementioned optical fiber, in one section the measurement equipment of statement from claim 13 either of 15.
[claim18]
18. In each of fiber Bragg grating of the aforementioned 1 or more, as for center frequency of the frequency spectrum of reflected light mutually differing,
Fiber Bragg grating of the aforementioned 1 or more, as the aforementioned 1st COM light leaves from the position where incidence it does, in order for the aforementioned center frequency always to be small or not to become always large, is arranged in the aforementioned optical fiber, in one section the measurement equipment of statement from claim 13 either of 15.
[claim19]
19. Same period it does mutually, at the same time, the 1st COM light where frequency interval differs and the dual COM illuminant which forms 2nd COM light and,
The optical fiber which possesses the reflected point of 2 or more where spectral characteristics change with around environment the aforementioned 1st COM light incidence it does and,
The aforementioned 1st COM light which from the reflected point of the aforementioned 2 or more it was reflected or was transmitted, or and the measurement equipment which measures the beat signal of the aforementioned 2nd COM light of non polarized light state
Having,
As multi point type optical fiber sensors functioning the measurement equipment which is done.
[claim20]
20. As for the aforementioned dual COM illuminant,
The kind illuminant which laser light of single wave length radiation is done and,
The 1st COM optical generator which forms the aforementioned 1st COM light from the aforementioned laser light of the aforementioned kind illuminant and,
The 2nd COM optical generator which forms the aforementioned 2nd COM light from the aforementioned laser light of the aforementioned kind illuminant
It possesses,
In one section measurement equipment of statement from claim 12 either of 19.
[claim21]
21. It changes the frequency of the aforementioned laser light of the aforementioned kind illuminant, in claim 20 the measurement equipment of statement.
[claim22]
22. The aforementioned 1st COM optical generator at least the 1st phase modulator and either of the 1st strength modulators possessing,
The aforementioned 2nd COM optical generator at least the 2nd phase modulator and either of the 2nd strength modulators possessing,
At least, when, same period it is controlled, in claim 20 or 21 the measurement equipment of statement either the aforementioned 1st phase modulator and the aforementioned 1st strength modulators at least either the aforementioned 2nd phase modulator and the aforementioned 2nd strength modulators.
  • Applicant
  • ※All designated countries except for US in the data before July 2012
  • TOKYO UNIVERSITY OF AGRICULTURE AND TECHNOLOGY
  • SAITAMA UNIVERSITY
  • Inventor
  • TANAKA YOSUKE
  • KUROKAWA TAKASHI
  • SHIODA TATSUTOSHI
  • KASHIWAGI KEN
IPC(International Patent Classification)
Specified countries National States: AE AG AL AM AO AT AU AZ BA BB BG BH BN BR BW BY BZ CA CH CL CN CO CR CU CZ DE DK DM DO DZ EC EE EG ES FI GB GD GE GH GM GT HN HR HU ID IL IN IR IS JP KE KG KN KP KR KZ LA LC LK LR LS LU LY MA MD ME MG MK MN MW MX MY MZ NA NG NI NO NZ OM PA PE PG PH PL PT QA RO RS RU RW SA SC SD SE SG SK SL SM ST SV SY TH TJ TM TN TR TT TZ UA UG US UZ VC VN ZA ZM ZW
ARIPO: BW GH GM KE LR LS MW MZ NA RW SD SL SZ TZ UG ZM ZW
EAPO: AM AZ BY KG KZ RU TJ TM
EPO: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
OAPI: BF BJ CF CG CI CM GA GN GQ GW KM ML MR NE SN ST TD TG
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