Judgment and Compensation of Deviation of the Optical Interferometric Sensor's Operating Point From the Interferometer Quadrature Point

Dong, Zhifei; Hu, Xinyu; Ren, Dipeng; Xiong, Linsen; Liu, Xin; Deng, Xin; Cai, Chen; Qi, Zhi‐mei

doi:10.1109/jlt.2021.3109673

Cited by 11 publications

(4 citation statements)

References 32 publications

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“…The measured temporal response is shown in the inset of Figure 7 a, and the corresponding FFT result with a frequency resolution of Δ f = 1 Hz is displayed in Figure 7 a, in which there are the fundamental peak at 500 Hz and the second harmonic peak at 1000 Hz and the third harmonic peak at 1500 Hz. The presence of harmonic signals implies that the fiber-optic microphone under test does not work at the quadrature point and Equation (8) is not satisfied [ 29 ]. The signal-to-noise ratio (SNR) for the fundamental signal is 72 dB relative to 1 V. Therefore, the minimum detectable pressure (MDP) for the microphone under test is calculated to be 251 μPa/Hz 1/2 based on the following equation [ 30 ].…”

Section: Resultsmentioning

confidence: 99%

Fabrication of Glass Diaphragm Based Fiber-Optic Microphone for Sensitive Detection of Airborne and Waterborne Sounds

Liu

et al. 2022

Sensors

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A glass-diaphragm microphone was developed based on fiber-optic Fabry-Perot (FP) interferometry. The glass diaphragm was shaped into a wheel-like structure on a 150-μm-thick glass sheet by laser cutting, which consists of a glass disc connected to an outer glass ring by four identical glass beams. Such a structural diaphragm offers the microphone an open air chamber that reduces air damping and increases sensitivity and results in a cardioid direction pattern for the microphone response. The prepared microphone operates at 1550 nm wavelength, showing high stability in a range of temperature from 10 to 40 °C. The microphone has a resonance peak at 1152 Hz with a quality factor of 21, and its 3-dB cut-off frequency is 32 Hz. At normal incidence of 500 Hz sound, the pressure sensitivity of the microphone is 755 mV/Pa and the corresponding minimum detectable pressure is 251 μPa/Hz1/2. In addition to the above characteristics of the microphone in air, a preliminary investigation reveals that the microphone can also work stably under water for a long time due to the combination of the open-chamber and fiber-optic structures, and it has a large signal-to-noise ratio in response to waterborne sounds. The microphone prepared in this work is simple, inexpensive, and electromagnetically robust, showing great potential for low-frequency acoustic detection in air and under water.

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Section: Resultsmentioning

confidence: 99%

Fabrication of Glass Diaphragm Based Fiber-Optic Microphone for Sensitive Detection of Airborne and Waterborne Sounds

Liu

et al. 2022

Sensors

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“…To further improve the sensor Q-point tracking performance, Zhifei Dong et al used the amplitude of the second harmonic (SH) component derived from the sensor's output signal to determine the degree of deviation and implemented deviation compensation by wavelength tuning (Figure 25d). [110] The wavelength tuning direction by the relationship between the fundamental frequency(FF) and the two phases of the SH component eliminates the ambiguity of the wavelength variation sign and speeds up the tuning. Although tunable laser sources can quickly track the Q-point, they require expensive equipment.…”

Section: Linear Intervalmentioning

confidence: 99%

Optical Interferometric MEMS Accelerometers

Zhao,

Qi,

Wang

et al. 2023

Laser & Photonics Reviews

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Laser interferometry is one of the most accurate measurement technologies whose displacement resolution can reach the femtometer (fm) level. With the development of Micro‐Electro‐Mechanical Systems(MEMS) technology, many excellent optical interferometric MEMS sensors have emerged, which play an essential role in intelligent manufacturing, aerospace, and many other fields. Among them, optical interferometric MEMS accelerometers develop rapidly due to their high sensitivity, low noise, and anti‐electromagnetic interference advantages. Lots of research in optical interferometric chip design, micro‐nano fabrication process, signal demodulation algorithm, and range extension technology are performed, and different types of MEMS accelerometers based on the optical interferometric principles are developed, which have been demonstrated and applied in the fields of disaster monitoring, equipment operation and maintenance, and resource exploration. This paper reviews the development status of optical interferometric MEMS accelerometers, mainly focusing on the critical problems and solutions that need to be solved in the development process of optical interferometric accelerometers, and finally introduces the typical application scenarios.

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“…However, its phase delay and algorithm complexity render it unsuitable for real-time detection of high-speed signals. In comparison, quadrature point (Q-point) demodulation has the advantages of highsensitivity, good linearity, straightforward signal processing and fast responsiveness [30,31]. By locating the Q-point at the steepest slope in the interference spectrum to elongate the intensity variation range and maximize its sensing performance.…”

Section: Introductionmentioning

confidence: 99%

High-Sensitivity EFPI-Based Acoustic Sensor Using in-Fiber Collimator and Adjustable 45° Mirror

Zhang,

Luo,

Zhang

et al. 2024

IEEE Photonics J.

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In this paper, a high-sensitivity cross-axial extrinsic Fabry-Perot interferometric (EFPI) acoustic sensor is proposed and experimentally demonstrated. The cross-axial EFPI is constructed by optical fiber and cantilever's inner surface, assisted with an adjustable 45° mirror. Herein, the 45° mirror is utilized to achieve beam total reflection and flexibly adjust the parallelism of the two reflectors. A quarter-pitch graded index fiber (GIF) is introduced as an in-fiber collimator to reduce beam propagation loss and thus enhance coupling efficiency. Experimental results show that the proposed sensor achieves a high fringe visibility of up to 41 dB, greatly enhancing acoustic sensing performance. Furthermore, the sensitivity and the minimum detectable pressure (MDP) measured at resonance frequency (@2.05 kHz) are significantly improved to be 70.67 mV/Pa that is corresponding to mechanical sensitivity of ~2490 nm/Pa, and 13.4 μPa/Hz 1/2 , respectively. The proposed sensor demonstrates the potential for low-frequency vibration monitoring with the advantages of easy fabrication, highsensitivity and flexible manipulability.

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Judgment and Compensation of Deviation of the Optical Interferometric Sensor's Operating Point From the Interferometer Quadrature Point

Cited by 11 publications

References 32 publications

Fabrication of Glass Diaphragm Based Fiber-Optic Microphone for Sensitive Detection of Airborne and Waterborne Sounds

Fabrication of Glass Diaphragm Based Fiber-Optic Microphone for Sensitive Detection of Airborne and Waterborne Sounds

Optical Interferometric MEMS Accelerometers

High-Sensitivity EFPI-Based Acoustic Sensor Using in-Fiber Collimator and Adjustable 45° Mirror

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