짧은 센서부를 가진 편광유지 광자결정 광섬유 기반 편광 간섭형 스트레인 센서
Polarization-Maintaining Photonic-Crystal-Fiber-based Polarimetric Strain Sensor with a Short Sensing Head
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초록
본 논문에서는 짧은 길이의 편광유지 광자결정 광섬유(polarization-maintaining photonic crystal fiber : 이하 PM-PCF) 와 3 dB광섬유 결합기(fiber coupler), 그리고 편광 조절기(polarization controller) 로 구성된 사냑(Sagnac) 복굴절 간섭계(birefringenceinterferometer) 를 이용하여 온도에 둔감한 편광 간섭형 스트레인 센서(polarimetric strain sensor) 를 구현하였다. 센서부(sensorhead) 로 사용된 PM-PCF의 길이는 2 cm이었고, 이는 기존의 PM-PCF 기반 편광 간섭형 스트레인 센서들과 비교할 때 가장짧은 센서부 길이이다. 제안된 센서는 0~8 mε의 범위에 대해서 스트레인 측정을 수행하였으며, ~0.87 pm/με에 해당하는 스트레인 민감도를 얻을 수 있었다. 또한, 외부 온도를 30℃에서 100℃까지 변화시키며 제안된 센서의 온도 의존성을 조사한 결과,약 -12 pm/℃의 온도 민감도를 얻을 수 있었으며, 이는 기존의 편광 유지 광섬유의 온도 민감도(약 -990 pm/℃) 에 비해 약 82배정도 작은 값이다. 특히, 실용적인 관점에서 센서 표지자(indicator) 로 사용되는 파장이 스트레인 민감도에 큰 영향을 주지 않는다는 것을 실험 및 이론적으로 확인하였다.
Abstract
In this paper we have implemented a temperature-insensitive polarimetric fiber strain sensor based on a Sagnac birefringenceinterferometer composed of a short polarization-maintaining photonic crystal fiber (PM-PCF), a 3-dB fiber coupler, andpolarization controllers. The PM-PCF used as a sensor head was 2 cm long, which is the shortest length for a sensing elementcompared to other polarimetric fiber strain sensors using a PM-PCF. The proposed sensor showed a strain sensitivity of ~0.87pm/με with a strain measurement range from 0 to 8 mε. The temperature sensitivity was also investigated and measured asapproximately -12 pm/℃, when ambient temperature changed from 30 to 100℃. This temperature sensitivity is about 82 timessmaller than that of conventional polarization-maintaining fiber (approximately -990 pm/℃). In particular, from a practicalperspective we have experimentally and theoretically confirmed that the wavelength selected for the indicator dip location doesnot make a significant difference in the strain sensitivity.
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