Journal
JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 32, Issue 23, Pages 4035-4039Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2014.2358713
Keywords
Fabry-Perot interferometers; optical fiber transducers; pressure measurement
Funding
- National Natural Science Foundation of China [61138006, 61108016, 11074085]
- National Basic Research Program of China (973 Program) [2014CB340101]
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We experimentally demonstrate a sensitivity-enhanced fiber-optic pressure sensor using a simplified hollow-core photonic crystal fiber (SHC-PCF). The sensing head is fabricated by splicing a single mode fiber to a section of SHC-PCF, while the air claddings at the end of the PCF are selectively blocked by glue sealing and femtosecond laser machining. By immersing the end into water, a compressible Fabry-Perot cavity can be formed in the fiber core of the PCF. Since the air core is opened up to the air claddings at the splicing joint, changing of environmental pressure will cost a large change of the cavity length to balance the pressure, which greatly enhances the pressure sensitivity of the sensor. A pressure sensitivity of 18.15 mu m/kPa is experimentally demonstrated in the pressure range from 110 to 130 kPa. This sensor has potential applications in the area of highly sensitive pressure measurement.
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