| 摘要 |
<p>The objective of the present invention is to offer an optical fiber strain-measuring apparatus, which allows the detecting of the amount of strain at an arbitrary distance within a test optical fiber as well as the distance strain distribution, and facilitates the detecting of the back scattered light. In order to achieve the above objective, the present invention comprises an acousto-optic switch 108 which outputs a measuring pulse light, an optical circulator 112 which forwards the measuring pulse light to an optical ring circuit possessing a test optical fiber 124, while allowing the natural Brillouin back scattered light generated from the test optical fiber 124 to travel through the optical ring circuit, a frequency conversion section 132 to successively convert the reference light outputted from an optical directional coupler 102 into a reference pulse train which has its frequency change into a step form, and an acousto-optic switch 134 to output the reference pulse train as a sampling pulse, and the sampling pulse and the natural Brillouin back scattered light outputted from the optical ring circuit are converted into electrical signals by the opto-electric conversion section 138, and the signal processing section 146 measures the strain of the test optical fiber 124 based on these electrical signals.</p> |
