A fiber-optical microphone based on a Fabry–Perot interferometer applied for thermo-acoustic measurements

Konle, H. J.; Paschereit, Christian Oliver; Röhle, I.

doi:10.1088/0957-0233/21/1/015302

Cited by 12 publications

(5 citation statements)

References 16 publications

(18 reference statements)

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“…As reported in previous publications [7,8], a fiberbased interferometer can easily be combined with a reflecting membrane to create an acoustic sensor, whereas the performance of the created sensor can be validated by comparing the acquired data with the signal of conventional acoustic sensors, for example, condenser microphones. The newly designed optical setup was combined with a stainless steel sensor head (see figure 6), based on a stainless steel membrane material with a thickness of 20 μm.…”

Section: Resultsmentioning

confidence: 99%

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A new approach for setting up and applying a fiber-based Fabry–Perot interferometer

Konle¹,

Spitalny²,

Paschereit³

et al. 2010

Meas. Sci. Technol.

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A new approach using fiber-based Fabry-Perot interferometry for constructing highly resistant and highly accurate vibration sensors is presented. The application of a diode array makes it possible to acquire a multitude of interference signals which can be classified into pairs of signals fulfilling the quadrature condition. This approach reaches the sensitivity of single-mode optical fiber interferometers proposed in the past while providing a much higher signal accuracy.

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Section: Resultsmentioning

confidence: 99%

“…[3]); some with the simultaneous application of several laser light sources (e.g. [4]); and some with even more complex setups (see [5,7]).…”

Section: Introductionmentioning

confidence: 99%

A new approach for setting up and applying a fiber-based Fabry–Perot interferometer

Konle¹,

Spitalny²,

Paschereit³

et al. 2010

Meas. Sci. Technol.

Self Cite

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show abstract

“…However, the high-temperature application of the acoustic sensor can be realized by selecting the diaphragm material with high-temperature resistance. For example, based on the interference detection principle of sound-induced membrane displacement, J Konle et al used the Fabry-Perot interferometer to realize acoustic sensing under high temperature, which was successfully applied in a combustion chamber [25]. The highest operating temperature of the sensor was measured to be up to 800 °C.…”

Section: Introductionmentioning

confidence: 99%

The manufacture and reliability analysis of the all-rigid Fabry–Perot resonator for fiber-optic acoustic sensors

et al. 2023

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By the continuous development of aerospace, petroleum exploration, and other industrial fields, the fiber-optic acoustic sensor (FOAS) with high reliability is a desideration sensor, which can be used for noise monitoring in the extremely harsh environment. The FOAS based on the all-rigid Fabry–Perot resonator (FPR) relies on the new acoustic sensitive principle, where the change in the air refractive index is induced by sound waves and gets rid of the distortion caused by the mechanical characteristics of the acoustic sensor based on the movable parts. So, the FPR-based FOAS is very suitable for acoustic sensing in the harsh environment. In this paper, the reliability of this kind of FOASs is simulated and analyzed. The modal and anti-vibration simulation results of FPR with different sizes show that the FPR has a high natural frequency, and the external vibration environment does not affect the acoustic sensitivity of the FPR. The micro and small-batch all-rigid FPR can be manufactured by the optical contact. Moreover, the FPR can withstand the high temperature of 500°C that is verified by rapid heat treatment equipment. In order to improve the reliability of the FOAS, the metal packing shell is designed and fabricated. Moreover, the vibration and high-temperature tests of the packaged sensor are carried out. The two groups of tests show that the sensor can work normally under 10 g of acceleration vibration and 200°C high temperature, respectively. Therefore, the FOAS based on the FPR has high reliability and is very suitable for noise monitoring in the extreme harsh environment of various industrial fields. Furthermore, the research results of this paper will enhance the competitiveness and influence of the commercialized FOAS.

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“…This FP fiber sensor receiver is based on FP interferometer principle. Fiber based Fabry-Perot sensors are known for decades, many of them are high temperature stable and can be used for acoustic detection [26,27,28,29]. In this paper, a new FP fiber sensor was designed and built for the system.…”

Section: Introductionmentioning

confidence: 99%

A Fiber Optic Ultrasonic Sensing System for High Temperature Monitoring Using Optically Generated Ultrasonic Waves

Zhou

Guo

et al. 2019

Sensors

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This paper presents the design, fabrication, and characterization of a novel fiber optic ultrasonic sensing system based on the photoacoustic (PA) ultrasound generation principle and Fabry-Perot interferometer principle for high temperature monitoring applications. The velocity of a sound wave traveling in a medium is proportional to the medium’s temperature. The fiber optic ultrasonic sensing system was applied to measure the change of the velocity of sound. A fiber optic ultrasonic generator and a Fabry-Perot fiber sensor were used as the signal generator and receiver, respectively. A carbon black-polydimethylsiloxane (PDMS) material was utilized as the photoacoustic material for the fiber optic ultrasonic generator. Two tests were performed. The system verification test proves the ultrasound sensing capability. The high temperature test validates the high temperature measurement capability. The sensing system survived 700 °C. It successfully detects the ultrasonic signal and got the temperature measurements. The test results agreed with the reference sensor data. Two potential industry applications of fiber optic ultrasonic sensing system are, it could serve as an acoustic pyrometer for temperature field monitoring in an industrial combustion facility, and it could be used for exhaust gas temperature monitoring for a turbine engine.

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A fiber-optical microphone based on a Fabry–Perot interferometer applied for thermo-acoustic measurements

Cited by 12 publications

References 16 publications

A new approach for setting up and applying a fiber-based Fabry–Perot interferometer

A new approach for setting up and applying a fiber-based Fabry–Perot interferometer

The manufacture and reliability analysis of the all-rigid Fabry–Perot resonator for fiber-optic acoustic sensors

A Fiber Optic Ultrasonic Sensing System for High Temperature Monitoring Using Optically Generated Ultrasonic Waves

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