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Vol. 174, Issue 7, July 2014, pp. 14-20

 

Bullet

 

Research on Distributed Gas Detection Based on Hollow-core Photonic Crystal Fiber
 

1 Gui XIN, 1, 2 Li ZHENG-YING, 1 Wang HONG-HAI, 2 He JIA, 1 Hu CHEN-CHEN, 1 Ma LI-JUAN, 2 Zheng-LOU

1 National Engineering Laboratory for Fiber Optic Sensing Technology, Wuhan University of Technology, Wuhan, Hubei, China 430070
2 Key Laboratory of Fiber Optic Sensing Technology and Information Processing, Ministry of Education, Wuhan University of Technology, Wuhan , Hubei, China 430070
1 Tel.: 18064111499

E-mail: guixin@whut.edu.cn

 

Received: 2 May 2014 /Accepted: 30 June 2014 /Published: 31 July 2014

Digital Sensors and Sensor Sysstems

 

Abstract: We have demonstrated a distributed gas detection system by using hollow-core photonic crystal fiber (HC-PCF) as a gas chamber. The HC-PCF gas chamber has several lateral micro- channels fabricated by the femtosecond laser. The HC-PCF is connected to the single mode fiber by thermal splicing, and gas can diffuse in hollow-core of PCF via micro-channels. Compared to the traditional gas chamber, the HC-PCF gas chamber has relatively simpler construction and quite stability. According to experiment results, the system response time of 15 s has been achieved for a 5 cm HC-PCF which has ten channels with 4mm channel distance. It would construct long sensing length fiber gas sensor that the side holes and the splicer have introduced very little loss. Thus make it possible to achieve highly sensitive sensing system without influencing the response time. By using self-reference demodulation algorithm and space division multiplexing technique, distributed gas detection system with fast response was achieved.

 

Keywords: Hollow-core photonic crystal fiber (HC-PCF), Femtosecond laser, Distributed detection, Gas sensor.

 

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