Fiber-optic microphone based on a combination of Fabry–Perot interferometry and intensity modulation

Zhou, Chonghua; Letcher, S. V.; Shukla, Arun

doi:10.1121/1.413669

Cited by 19 publications

(6 citation statements)

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“…For example, [5] cites a measured MDP of 900 mPa Hz −1/2 at around 8 kHz in a sensor with a similar diaphragm diameter as used in this work (150 µm). A measured MDP of only ∼20 mPa Hz −1/2 at 1.2 kHz has been reported in [6], but it was obtained with a much larger diaphragm (12 mm in diameter), which therefore deflects much more easily. For a diaphragm 150 µm in diameter, the acoustic compliance would have been reduced by at least two orders of magnitude.…”

Section: Introductionmentioning

confidence: 91%

“…Similar FP-based fibre microphones utilizing a movable diaphragm positioned in front of a fibre tip have been described in the literature. Of these, only a few [5,6] report an actual MDP that we can compare to the value measured in this work. [5] cites a minimum detectable pressure of 900 mPa Hz −1/2 , measured at 8 kHz with a diaphragm of diameter comparable to the sensor of this work (50-100 µm versus 150 µm).…”

Section: Characterizationmentioning

confidence: 97%

“…[5] cites a minimum detectable pressure of 900 mPa Hz −1/2 , measured at 8 kHz with a diaphragm of diameter comparable to the sensor of this work (50-100 µm versus 150 µm). Another FP sensor has a measured MDP of ∼20 mPa Hz −1/2 at 1.2 kHz [6]. This sensor employed a diaphragm with a 12 mm diameter, which deflects much more easily than our 150 µm diaphragm.…”

Section: Characterizationmentioning

confidence: 99%

See 2 more Smart Citations

External fibre Fabry–Perot acoustic sensor based on a photonic-crystal mirror

Kilic¹,

Digonnet²,

Kino³

et al. 2007

Meas. Sci. Technol.

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We demonstrate an acoustic sensor based on a Fabry–Perot interferometer formed by a single-mode fibre and an external silicon photonic-crystal mirror. Measurements in air indicate that this sensor has a relatively uniform frequency response up to at least 50 kHz, and detects pressures as low as 18 μPa Hz−1/2. This limit is four orders of magnitude lower than in similar types of acoustic fibre sensors. The sensor response agrees with mechanical calculations to within a few dB. We predict that this sensor has the potential to detect pressures as low as 600 nPa Hz−1/2, corresponding to the ambient thermal noise level in air at room temperature.

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Section: Introductionmentioning

confidence: 91%

Section: Characterizationmentioning

confidence: 97%

Section: Characterizationmentioning

confidence: 99%

See 1 more Smart Citation

External fibre Fabry–Perot acoustic sensor based on a photonic-crystal mirror

Kilic¹,

Digonnet²,

Kino³

et al. 2007

Meas. Sci. Technol.

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“…On the other hand, the acoustic performance indexes of EFPI-type fiber-optic acoustic pressure sensors are related to the variation in the interferometric light intensity spectra generated by their F-P cavities [6], but there are only theoretical studies in this field and no empirical measurements to prove the relationship between the two. Therefore, a technical method is urgently needed to investigate the main factors affecting the acoustic performance of optical fiber sound pressure sensors and to prepare sensors with higher performance based on the existing research.…”

Section: Introductionmentioning

confidence: 99%

The Performance Characterization and Optimization of Fiber-Optic Acoustic Pressure Sensors Based on the MOEMS Sensitized Structure

Zhou,

Guan,

et al. 2023

Sensors

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In order to investigate the factors affecting the acoustic performance of the extrinsic Fabry–Perot interferometer (EFPI) fiber-optic acoustic pressure sensor and to effectively improve its detection capability, this paper enhances the sensor’s detection sensitivity by adding more sensitized rings to its acoustic pressure-sensitive film. Furthermore, a novel real-time coupled acoustic test method is proposed to simultaneously monitor the changes in the spectral and acoustic metrics of the sensor to characterize its overall performance. Finally, an EFPI-type fiber-optic acoustic pressure sensor was developed based on the Micro-Optical Electro-Mechanical System (MOEMS). The acoustic tests indicate that the optimized fiber-optic acoustic pressure sensor has a sensitivity as high as 2253.2 mV/Pa, and the acoustic overload point (AOP) and signal-to-noise ratios (SNRs) can reach 108.85 dB SPL and 79.22 dB, respectively. These results show that the sensor produced through performance characterization experiments and subsequent optimization has a very high acoustic performance index, which provides a scientific theoretical basis for improving the overall performance of the sensor and will have broad application prospects in the field of acoustic detection.

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“…For dynamic signal detection, such as for sound waves, where the light source is monochromatic, the FFPC sensor should work at a quadrature point of the interference spectrum [ 19 , 20 , 21 , 22 , 23 ] to achieve a linear output and high sensitivity. This method is called intensity demodulation [ 22 ], which requires the FFPC sensing probe to have a certain cavity length.…”

Section: Introductionmentioning

confidence: 99%

Fabry–Perot Cavity Sensing Probe with High Thermal Stability for an Acoustic Sensor by Structure Compensation

Cheng

Zhou

Zou

2018

Sensors

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Fiber Fabry–Perot cavity sensing probes with high thermal stability for dynamic signal detection which are based on a new method of structure compensation by a proposed thermal expansion model, are presented here. The model reveals that the change of static cavity length with temperature only depends on the thermal expansion coefficient of the materials and the structure parameters. So, fiber Fabry–Perot cavity sensing probes with inherent temperature insensitivity can be obtained by structure compensation. To verify the method, detailed experiments were carried out. The experimental results reveal that the static cavity length of the fiber Fabry–Perot cavity sensing probe with structure compensation hardly changes in the temperature range of −20 to 60 °C and that the method is highly reproducible. Such a method provides a simple approach that allows the as-fabricated fiber Fabry–Perot cavity acoustic sensor to be used for practical applications, exhibiting the great advantages of its simple architecture and high reliability.

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Fiber-optic microphone based on a combination of Fabry–Perot interferometry and intensity modulation

Cited by 19 publications

References 0 publications

External fibre Fabry–Perot acoustic sensor based on a photonic-crystal mirror

External fibre Fabry–Perot acoustic sensor based on a photonic-crystal mirror

The Performance Characterization and Optimization of Fiber-Optic Acoustic Pressure Sensors Based on the MOEMS Sensitized Structure

Fabry–Perot Cavity Sensing Probe with High Thermal Stability for an Acoustic Sensor by Structure Compensation

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