| 摘要 |
<p>A fiber optic sensor comprising: a laser source (10) which emits a first laser ray; an optical divider (11, 55, 60) which receives said first laser ray and provides a second laser ray (S) and a third laser ray (OL); a first optical fiber (20) which receives said second laser ray (S); a second optical fiber (24) which receives said third laser ray (OL); said first optical fiber (20) having the same length as said second optical fiber (24); said first optical fiber (20) and said second optical fiber (24) being side by side; a transmissive means (22, 35) associated with said first optical fiber through which said second laser ray (S) transits; a first reflection means (23, 37, 52, 64) for said third laser ray (OL) applied to said transmissive means (22, 35) to provide a reflected third laser ray (OL); a second reflection means (25, 52, 64) for said second laser ray (S) applied to said second optical fiber (24) to provide a reflected second laser ray (S); a first receiver means (13, 50, 55, 60) positioned between said optical divider (11, 55, 60) and said first optical fiber (20) to receive said second laser ray (S) reflected by said first reflection means (23, 37, 52, 64); a second receiver means (16, 51, 55, 60) positioned between said optical divider (11, 55, 60) and said second optical fiber (24) to receive said third laser ray (OL) reflected by said second reflection mean (25, 52, 64); a coherent receiver (30, 53, 55, 56) which receives said reflected second laser ray (S) and said reflected first laser ray (OL) to provide optical signals in quadrature (I and Q) at its output; opto/electric converters (31) which receive the optical outputs of the coherent receiver (30, 53, 55, 56) and produce analog electrical signals which are converted into digital signals (32) which are fed to a digital signal processor (33).</p> |
