SENSING SYSTEM UTILIZING BRILLOUIN SCATTERING PHENOMENON

PROBLEM TO BE SOLVED: To obtain a sensing system in which the strain distribution and temperature distribution can be measured easily with high accuracy without requiring two light sources by propagating a pulse light from a photoswitch and a signal light from a frequency controller oppositely. SOLU...

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Bibliographische Detailangaben
Hauptverfasser:	NISHIKAWA SHIGEAKI, NEGAMI SHOICHI
Format:	Patent
Sprache:	eng
Schlagworte:	MEASURING MEASURING ANGLES MEASURING AREAS MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER,MECHANICAL EFFICIENCY, OR FLUID PRESSURE MEASURING IRREGULARITIES OF SURFACES OR CONTOURS MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS MEASURING QUANTITY OF HEAT MEASURING TEMPERATURE PHYSICS TESTING TESTING STATIC OR DYNAMIC BALANCE OF MACHINES ORSTRUCTURES TESTING STRUCTURES OR APPARATUS NOT OTHERWISE PROVIDED FOR THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To obtain a sensing system in which the strain distribution and temperature distribution can be measured easily with high accuracy without requiring two light sources by propagating a pulse light from a photoswitch and a signal light from a frequency controller oppositely. SOLUTION: A photocoupler 2 splits a signal light CW1 from a light source 1 into signal lights CW2 , CM3 and a photoswitch 3 modulates the signal light CW2 optically to produce a pulse light. A Brillouin scattering frequency converter 4 produces a signal light CW4 having a frequency subjected to Briliouin frequency shift from the signal light CW3 propagating on an optical fiber 9 as a result of a specified amount of strain or a specified temperature being applied to the optical fiber 9. A frequency controller 5 shifts the frequency of signal light CW4 to produce a signal light CW5 . Among Brillouin scattering lights generated in a sensor fiber 6 depending on the external force or temperature being applied, only the light having frequency matching that of signal light CW5 from the controller 5 is detected by a photodetector 7.