A Composite Fabry-Perot Interferometric Sensor with the Dual-Cavity Structure for Simultaneous Measurement of High Temperature and Strain

In this paper, an optical fiber composite Fabry-Perot interferometric (CFPI) sensor capable of simultaneous measurement of high temperature and strain is presented. The CFPI sensor consists of a silica-cavity intrinsic Fabry–Perot interferometer (IFPI) cascading an air-cavity extrinsic Fabry–Perot interferometer (EFPI). The IFPI is constructed at the end of the transmission single-mode fiber (SMF) by splicing a short piece of photonic crystal fiber (PCF) to SMF and then the IFPI is inserted into a quartz capillary with a reflective surface to form a single-ended sliding EFPI. In such a configuration, the IFPI is only sensitive to temperature and the EFPI is sensitive to strain, which allows the achieving of temperature-compensated strain measurement. The experimental results show that the proposed sensor has good high-temperature resistance up to 1000 °C. Strain measurement under high temperatures is demonstrated for high-temperature suitability and stable strain response. Featuring intrinsic safety, compact structure and small size, the proposed CFPI sensor may find important applications in the high-temperature harsh environment.

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Cascaded-Cavity Fabry-Perot Interferometric Gas Pressure Sensor based on Vernier Effect

Sensors ◽

10.3390/s18113677 ◽

2018 ◽

Vol 18 (11) ◽

pp. 3677 ◽

Cited By ~ 8

Author(s):

Peng Chen ◽

Yutang Dai ◽

Dongsheng Zhang ◽

Xiaoyan Wen ◽

Minghong Yang

Keyword(s):

Capillary Tube ◽

High Sensitivity ◽

Single Mode ◽

Single Mode Fiber ◽

Gas Pressure ◽

Glass Capillary ◽

Compact Structure ◽

Fabry Perot ◽

Fs Laser ◽

Vernier Effect

An extrinsic Fabry-Perot interferometer (EFPI) composed of double fiber FP cavities in a glass capillary tube to generate Vernier effect has been fabricated and employed for gas pressure sensing. A lead-in single-mode fiber (LSMF) and a reflective single-mode fiber (RSMF) were inserted into the capillary tube to form a FP cavity. Femtosecond (fs) laser was used to ablate openings on a capillary tube for gas passage to the FP cavity. A fusion hole was also drilled on the end face of a SMF by fs laser. The sensitivity of the sensor is enhanced due to Vernier effect. Experimental results show that the sensitivity was as high as 86.64 nm/MPa in the range of 0~0.6 MPa, which is 32.8 times larger than that of an open-cavity EFPI sensor without Vernier effect. The temperature cross-sensitivity of the sensor was measured to be about 5.18 KPa/°C. The proposed sensor was characterized by its high sensitivity, compact structure and ease of fabrication, and would have extensive application prospects in gas sensing fields.

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All Single-Mode Fiber Fabry-Pérot Interferometric High Temperature Sensor Fabricated with Femtosecond Laser

Chinese Journal of Lasers ◽

10.3788/cjl201239.1005001 ◽

2012 ◽

Vol 39 (10) ◽

pp. 1005001

Author(s):

王文辕 Wang Wenyuan ◽

文建湘 Wen Jianxiang ◽

庞拂飞 Pang Fufei ◽

陈娜 Chen Na ◽

王廷云 Wang Tingyun

Keyword(s):

High Temperature ◽

Femtosecond Laser ◽

Temperature Sensor ◽

Single Mode ◽

Single Mode Fiber ◽

Fabry Perot ◽

High Temperature Sensor

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PCF-based Fabry-Perot interferometric sensor for strain measurement under high-temperature

10.1117/12.884847 ◽

2011 ◽

Author(s):

Ming Deng ◽

Chang-Ping Tang ◽

Tao Zhu ◽

Yun-Jiang Rao

Keyword(s):

High Temperature ◽

Strain Measurement ◽

Fabry Perot ◽

Interferometric Sensor

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A High Sensitivity Temperature Sensing Probe Based on Microfiber Fabry-Perot Interference

Sensors ◽

10.3390/s19081819 ◽

2019 ◽

Vol 19 (8) ◽

pp. 1819 ◽

Cited By ~ 11

Author(s):

Zhoubing Li ◽

Yue Zhang ◽

Chunqiao Ren ◽

Zhengqi Sui ◽

Jin Li

Keyword(s):

Low Cost ◽

High Sensitivity ◽

Single Mode ◽

Single Mode Fiber ◽

Temperature Sensing ◽

Compact Structure ◽

Fabry Perot ◽

Temperature Monitor ◽

Core Fiber ◽

Fitting In

In this paper, a miniature Fabry-Perot temperature probe was designed by using polydimethylsiloxane (PDMS) to encapsulate a microfiber in one cut of hollow core fiber (HCF). The microfiber tip and a common single mode fiber (SMF) end were used as the two reflectors of the Fabry-Perot interferometer. The temperature sensing performance was experimentally demonstrated with a sensitivity of 11.86 nm/°C and an excellent linear fitting in the range of 43–50 °C. This high sensitivity depends on the large thermal-expansion coefficient of PDMS. This temperature sensor can operate no higher than 200 °C limiting by the physicochemical properties of PDMS. The low cost, fast fabrication process, compact structure and outstanding resolution of less than 10−4 °C enable it being as a promising candidate for exploring the temperature monitor or controller with ultra-high sensitivity and precision.

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