Small in-fiber Fabry-Perot low-frequency acoustic pressure sensor with PDMS diaphragm embedded in hollow-core fiber

Zhao, Yong; Chen, Mao-qing; Xia, Feng; Lv, Ri-qing

doi:10.1016/j.sna.2017.12.057

Cited by 129 publications

(30 citation statements)

References 17 publications

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“…By comparing the sensitivity of the sensor, the value of strain sensitivity is bigger than that of refs. , in addition, the sensitivity is almost four times larger than that of the all‐fiber microminiature FPI strain sensors without the tapered area (about 2 pm µε −1 ). In terms of the structure size of FPI, the cavity length of the tapered hollow‐core fiber air‐microbubble FPI is the smallest in the enumerated optic fiber FPI sensors, even smaller than the micro‐FPI prepared by the 157 nm laser micromachining technique.…”

Section: The Experimental Analysismentioning

confidence: 88%

“…Optical fiber sensing technology, which has evolved since the 1980s, is a hot topic now in the field of sensor . Compared with traditional electrical sensors, optical fiber sensors have a lot of unique advantages such as high sensitivity, compact volume, robustness, high temperature resistance, long distance communication, flexibility, as well as multiplexing . In addition, optic‐fiber interferometric sensors have been widely studied due to their potential applications in sensing of refractive index, ambient temperature, axial strain, magnetic field, sound pressure, forced vibration, and voltage .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Tapered Hollow‐Core Fiber Air‐Microbubble Fabry–Perot Interferometer for High Sensitivity Strain Measurement

Zhao

Chen

Peng

2018

Adv Materials Inter

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Mach-Zehnder interferometers, Fabry-Perot interferometers, and common-path interferometers.In a wide variety of optical fiber interferometric sensors, Fabry-Perot interferometer (FPI) has attracted wide attention for their compact volume and simple fabrication as well as cost-effective, which are excellent candidates for detecting the pressure, vibration, and acoustic wave in harsh environment such as high temperature and serious electromagnetic disturbance. [12][13][14] The fiber optic FPI sensors are generally made through using double Bragg gratings, air wave guide reflectors, self-reflecting connection head, or hollow-core fiber fusion. [15] Duan et al. put forward an all-fiber strain sensor based on Fabry-Perot interferometer (FPI), which has a microscopic air-bubble cavity with the diameter of ≈100 µm, and the temperature and strain sensitivity of 0.9 pm °C −1 and 4 pm µε −1 are manifested. [16] Monteiro et al. proposed a probe sensor using the hollow core microsphere superimposed on the single-mode fiber end, and the sensing structure allowed the detection of strain, with a sensitivity of 4.66 ± 0.03 pm µε −1 . [17] However, the performance and fabrication technology of optical fiber FPI sensors need further improvement in several respects, such as the high-precision controlling of the cavity length, the sensor's consistency, the production efficiency and the ability for multiparameter measurement.With the development and improvement of optical fiber fabrication technology, microstructural fibers (MOFs), such as hollow core fiber (HCF), photonic crystal fibers (PCFs), D-type fibers, and grapefruit fibers, have attracted a great interest due to their flexible design, controllable structure, and excellent optical properties. [18,19] It has significant effect on improving the performance of the fiber optic FPI sensors based on MOFs, and the corresponding researches are increasing year by year. Therefore, we intend to use hollow-core fiber combined with flexible and variable optical fiber fusion technology to prepare the microminiature and air-bubble FPI sensor, thereby improving its sensing performance of strain.In our works, a highly sensitive and ultracompact tapered hollow-core fiber air-microbubble Fabry-Perot interferometer (THMFPI) based strain sensor is proposed and demonstrated. The proposed sensor is fabricated by fusion splicing the lead-in and lead-out single-mode fibers (SMFs) with a hollow-core fiber (HCF), and then the hollow-core fiber is tapered at the center

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Section: The Experimental Analysismentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Tapered Hollow‐Core Fiber Air‐Microbubble Fabry–Perot Interferometer for High Sensitivity Strain Measurement

Zhao

Chen

Peng

2018

Adv Materials Inter

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“…However, the necessity of an unbalanced interferometer and phase modulator adds to the sensor complexity. The fabrication of microphones, based on interferometric techniques, such as Fabry-Perot, Mach-Zender, Michelson, or Sagnac is relatively less complex and cost-effective [22][23][24][25]. However, materializing the wavelength/phase dependent principles requires the use of costly interrogators, which inevitably adds to the overall cost of the microphone system.…”

Section: Introductionmentioning

confidence: 99%

S-shaped microfiber based diaphragm supported optical microphone

2019

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We propose and demonstrate a simple and highly sensitive optical microphone based on S-shaped tapered fibre (STF). The short pigtailed end of the STF is attached to the centre of a thin circular nitrile diaphragm. The applied acoustic signal deforms the nitrile diaphragm and due to the affixation, the STF structure gets modified leading to change in the bending angles of the two STF bends. As a consequence, the photodetector output, detecting the reflected light intensity of the STF, varies in accordance with the applied acoustic signal. Various properties of the proposed sensing setup can be easily tailored by changing the diaphragm diameter and thickness, and the shapes and size of the STF. For an optimized configuration, the proposed sensor achieves a sensitivity of 3.07 mV Pa −1 and a minimum detectable pressure of 36.48 mPa Hz −1 . The sensor shows a linear behaviour up to 1300 Hz and the experimental value of its first order natural frequency is

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“…The pressure sensitivity is about 1036 pm/MPa. In addition, Zhao et al [19] presented a small in-fiber Fabry-Perot low-frequency acoustic pressure sensor with PDMS diaphragm embedded in hollow-core fiber, which achieved a high sensitivity of 0.427 mV/MPa with a high linear pressure response in the range of 5 MPa-720 MPa. Meanwhile, two high-sensitivity strain sensors based on air microbubble were proposed [20].…”

Section: Introductionmentioning

confidence: 99%

Miniature All-Silica Microbubble-Based Fiber Optic Fabry-Perot Pressure Sensor with Pressure Leading-In Tube

Zhang

Liu

et al. 2019

Journal of Sensors

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A novel all-silica fiber optic Fabry-Perot (FP) pressure sensor with pressure leading-in tube based on microbubble structure is developed and experimentally demonstrated. The FP cavity is formed by fixing the end face of the single-mode fiber (SMF) parallel to the outer surface of the microbubble, in which the microbubble with a diameter of about 318 μm is constructed at the end of silica hollow tube. When external pressure is transmitted on the inner surface of the microbubble by the pressure leading-in tube, the FP cavity length changes with the diameter of microbubble. Experimental results show that such a sensor has a linear sensitivity of approximately 4.84 nm/MPa at room temperature over the pressure range of 1.1 MPa; the sensor has a very low temperature coefficient of approximately 2 pm/°C from room temperature to 600°C. The sensor has advantages of extremely low temperature coefficient, compact structure, and small size, which has potential applications for measuring pressure in high-temperature environment.

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Small in-fiber Fabry-Perot low-frequency acoustic pressure sensor with PDMS diaphragm embedded in hollow-core fiber

Cited by 129 publications

References 17 publications

Tapered Hollow‐Core Fiber Air‐Microbubble Fabry–Perot Interferometer for High Sensitivity Strain Measurement

Tapered Hollow‐Core Fiber Air‐Microbubble Fabry–Perot Interferometer for High Sensitivity Strain Measurement

S-shaped microfiber based diaphragm supported optical microphone

Miniature All-Silica Microbubble-Based Fiber Optic Fabry-Perot Pressure Sensor with Pressure Leading-In Tube

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