An In-Line Fiber Optic Fabry–Perot Sensor for High-Temperature Vibration Measurement

Chen, Dong; Qian, Jiang; Liu, Jia; Chan, Chi Hou; An, Guowen; Hong, Yongtaek; Jia, Pinggang; Xiong, Jijun

doi:10.3390/mi11030252

Cited by 24 publications

(3 citation statements)

References 28 publications

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“…Fiber optic sensors have been employed in a wide range of applications, including the measurement of several physical quantities such as pressure [1][2][3], salt content [4,5], vibration [6][7][8], refractive index [9][10][11], temperature [12][13][14], strain [15,16], micro-displacement [17], and relative humidity [18]. Owing to their advantages, such as compact size, light weight, immunity to electromagnetic interference, high sensitivity, wide temperature range, stability, and durability, optical fiber sensors play a pivotal role in the industry.…”

Section: Introductionmentioning

confidence: 99%

Ultra-High Sensitivity and Temperature-Insensitive Optical Fiber Strain Sensor Based on Dual Air Cavities

Liu

et al. 2023

Materials

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This study proposed an all-fiber Fabry–Perot interferometer (FPI) strain sensor with two miniature bubble cavities. The device was fabricated by writing two axial, mutually close short-line structures via femtosecond laser pulse illumination to induce a refractive index modified area in the core of a single-mode fiber (SMF). Subsequently, the gap between the two short lines was discharged with a fusion splicer, resulting in the formation of two adjacent bubbles simultaneously in a standard SMF. When measured directly, the strain sensitivity of dual air cavities is 2.4 pm/με, the same as that of a single bubble. The measurement range for a single bubble is 802.14 µε, while the measurement range for a double bubble is 1734.15 µε. Analysis of the envelope shows that the device possesses a strain sensitivity of up to 32.3 pm/με, which is 13.5 times higher than that of a single air cavity. Moreover, with a maximum temperature sensitivity of only 0.91 pm/°C, the temperature cross sensitivity could be neglected. As the device is based on the internal structure inside the optical fiber, its robustness could be guarantee. The device is simple to prepare, highly sensitive, and has wide application prospects in the field of strain measurement.

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Section: Introductionmentioning

confidence: 99%

Ultra-High Sensitivity and Temperature-Insensitive Optical Fiber Strain Sensor Based on Dual Air Cavities

Liu

et al. 2023

Materials

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“…Optical fiber sensors have been applied to the field of vibration sensing. Many structures have been used in the field of vibration sensing, such as an optical fiber ring structure [ 10 , 11 ], Fiber Bragg grating [ 12 , 13 ], in-line interferometer [ 14 , 15 , 16 ], and distributed vibration sensor [ 17 ]. Among them, various interferometers with a sandwich structure formed by combining different types of fibers are extensively adopted owing to the features of easy fabrication, high sensitivity, and a wide frequency response range.…”

Section: Introductionmentioning

confidence: 99%

Vibration Sensor Based on Hollow Biconical Fiber

Zhang

Wang

et al. 2021

Sensors

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A hollow biconical fiber is proposed and experimentally demonstrated for vibration sensing. It is fabricated by creating an air micro-cavity in single-mode fiber, followed by tapering it. Experimental results show that the device is highly sensitive to bending with a sensitivity of 21.30 dB/m−1. When it is exposed to vibration, its transmission loss is modulated periodically, then based on the measured transmission, the vibration frequency can be demodulated accurately. The acoustic vibration testing results show that the proposed device can detect and demodulate the exciting acoustic frequency accurately and distinguish its sound intensity, and the maximum signal to noise ratio (SNR) achieves up to 59 dB. Moreover, cantilever beam testing proves its performance reliable. Additionally, the sensing head has the advantages of a lightweight, compact size (with a total length of less than 250 μm), and insensitivity of temperature. All these features indicate the proposed sensor has a promising potential in the engineering field.

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“…According to the structure of FP, it can be divided into Fabry Pérot Interferometer (FPI) with variable cavity length and FPE with constant cavity length. FPI usually consists of a fiber end face [5][6][7][8] and a thin diaphragm [9,10]. Metal [11], polymers [12], graphene [13,14] and other materials [14,15] have been used to make diaphragms.…”

Section: Introductionmentioning

confidence: 99%

An Optical Acoustic Detection System Based on Fabry Pérot Etalon Stability Structure

Zheng

Chen

et al. 2021

Micromachines

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The optical acoustic detection system based on the Fabry Pérot Etalon (FPE) with high quality–factor (High Q) and stability structure is described and tested. The FPE contains two high–reflectivity Plano–Concave lenses, achieving high fineness and stability. The protective structure of the confocal stabilized FPE is composed of an invar tube, copper sheath, Bakelite sheath and aluminum housing to protect the sensor from the effects of ambient temperature and vibration. The audio signal is injected into the cavity through the sound hole located in the center of the cavity. Acoustic waves induce the vibration of the medium in the cavity, which leads to a simultaneous change in the FPE optical path and a shift of the interference spectrum. The acoustic detection system is built, and the frequency of the laser is locked on the resonant frequency points of the FPE by using phase modulation technology, so as to detect acoustic signals of different frequencies and amplitudes. In addition, the sensitivity of the proposed sensor exceeds 34.49 mV/Pa in the range of 20 Hz–20 kHz. A Signal-to-Noise Ratio (SNR) of 37 dB can be achieved at 20 Hz. Acoustic signal detection technology based on the FPE stability model is used to test the theoretical feasibility of the future high sensitivity Fabry Pérot Interferometric (FPI) acoustic sensors.

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An In-Line Fiber Optic Fabry–Perot Sensor for High-Temperature Vibration Measurement

Cited by 24 publications

References 28 publications

Ultra-High Sensitivity and Temperature-Insensitive Optical Fiber Strain Sensor Based on Dual Air Cavities

Ultra-High Sensitivity and Temperature-Insensitive Optical Fiber Strain Sensor Based on Dual Air Cavities

Vibration Sensor Based on Hollow Biconical Fiber

An Optical Acoustic Detection System Based on Fabry Pérot Etalon Stability Structure

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