物理学报
物理學報
물이학보
2013年
9期
62-68
,共7页
光纤传感器%侧漏型光子晶体光纤%扭转传感器%Sagnac干涉仪
光纖傳感器%側漏型光子晶體光纖%扭轉傳感器%Sagnac榦涉儀
광섬전감기%측루형광자정체광섬%뉴전전감기%Sagnac간섭의
optical fiber sensor%side-leakage photonic crystal fiber%torsion sensor%Sagnac interferometer
基于所研制的侧漏型光子晶体光纤,提出并构建了出一种同时检测扭转角度和扭转方向的高灵敏度Sagnac干涉仪型光纤扭转传感器.顺时针扭转时,传感器传输谱向短波长方向偏移;逆时针扭转,向长波长方向偏移.对传感器扭转特性的实验研究结果表明,构成Sagnac干涉仪的侧漏型光子晶体光纤的长度,对扭转敏感系数和扭转角度测量范围起着决定性作用.当光纤长度较短时,扭转传感器具有较大的扭转灵敏度,但扭转角度测量范围较小;光纤长度增加时,扭转灵敏度减小,扭转角度测量范围增大.当构成Sagnac干涉仪的侧漏型光子晶体光纤长度为14.85 cm时,传感器的扭转敏感系数可达到0.9354 nm/(?),扭转角度测量范围为–90?-90?;光纤长度为32 cm时,最大扭转敏感系数降为0.2132 nm/(?),扭转角度测量范围扩展至–180?-180?.采用二维测量矩阵法可以有效排除温度对扭转角度的测量的影响.
基于所研製的側漏型光子晶體光纖,提齣併構建瞭齣一種同時檢測扭轉角度和扭轉方嚮的高靈敏度Sagnac榦涉儀型光纖扭轉傳感器.順時針扭轉時,傳感器傳輸譜嚮短波長方嚮偏移;逆時針扭轉,嚮長波長方嚮偏移.對傳感器扭轉特性的實驗研究結果錶明,構成Sagnac榦涉儀的側漏型光子晶體光纖的長度,對扭轉敏感繫數和扭轉角度測量範圍起著決定性作用.噹光纖長度較短時,扭轉傳感器具有較大的扭轉靈敏度,但扭轉角度測量範圍較小;光纖長度增加時,扭轉靈敏度減小,扭轉角度測量範圍增大.噹構成Sagnac榦涉儀的側漏型光子晶體光纖長度為14.85 cm時,傳感器的扭轉敏感繫數可達到0.9354 nm/(?),扭轉角度測量範圍為–90?-90?;光纖長度為32 cm時,最大扭轉敏感繫數降為0.2132 nm/(?),扭轉角度測量範圍擴展至–180?-180?.採用二維測量矩陣法可以有效排除溫度對扭轉角度的測量的影響.
기우소연제적측루형광자정체광섬,제출병구건료출일충동시검측뉴전각도화뉴전방향적고령민도Sagnac간섭의형광섬뉴전전감기.순시침뉴전시,전감기전수보향단파장방향편이;역시침뉴전,향장파장방향편이.대전감기뉴전특성적실험연구결과표명,구성Sagnac간섭의적측루형광자정체광섬적장도,대뉴전민감계수화뉴전각도측량범위기착결정성작용.당광섬장도교단시,뉴전전감기구유교대적뉴전령민도,단뉴전각도측량범위교소;광섬장도증가시,뉴전령민도감소,뉴전각도측량범위증대.당구성Sagnac간섭의적측루형광자정체광섬장도위14.85 cm시,전감기적뉴전민감계수가체도0.9354 nm/(?),뉴전각도측량범위위–90?-90?;광섬장도위32 cm시,최대뉴전민감계수강위0.2132 nm/(?),뉴전각도측량범위확전지–180?-180?.채용이유측량구진법가이유효배제온도대뉴전각도적측량적영향.
A highly sensitive torsion sensor, which can measure the torsion angle and determine the torsion direction simultaneously, is pro-posed and experimentally demonstrated by using side-leakage photonic crystal fiber (SLPCF) based Sagnac loop. When the SLPCF is turned in the clockwise direction, the transmission spectra of the torsion sensor shift towards the shorter wavelength side;whereas the transmission spectra of the torsion sensor shift towards the longer wavelength side when the SLPCF is turned in anticlockwise direction. Experimental results demonstrate that the length of the SLPCF inserted into Sagnac loop plays an important role for determining the torsion sensitivity and the torsion angle range. For the SLPCF with shorter length, the torsion sensor has the larger torsion sensitivity, but the torsion angle measuring range would be decreased. The opposite situation takes place for the SLPCF with longer length used in the torsion sensor. When the length of SLPCF is 14.85 cm, the torsion sensitivity of the sensor is up to 0.9354 nm/(?) and the torsion angle range from–90? to+90?;When we increase the length of SLPCF to 32 cm, the torsion sensitivity of the sensor gets down to 0.2132 nm/(?), but the torsion angle range can be expanded as from–180?to+180?. To eliminate the perturbation of environmental temperature, we adopt a two-dimensional measuring matrix to achieve simultaneous measurements of the torsion angle and tempera-ture. In other words, using two-dimensional measuring matrix can also eliminate the perturbation of the environmental temperature to the measured result of torsion angle.
