Development of a Laser Pistonphone System to Calibrate the Sensitivity Modulus and Phase of Microphones for Infrasonic Frequencies

Suh, Jae-Gap; Cho, Wan‐Ho; Koukoulas, Triantafillos; Kim, Hack-Yoon; Cui, Zhenglie; Suzuki, Yôiti

doi:10.1007/s12541-020-00338-4

Cited by 6 publications

(3 citation statements)

References 17 publications

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“…In 2020, the National Metrology Institute of Russian Federation (VNIIFTRI) improved their pistonphone 3202 developed in the 60s to cover the frequency range 0.001 Hz to 50 Hz [38] but it should be noted that this device remains poorly documented, particularly with regards to metrological performance and demonstration of equivalences with other methods of calibration. Finally, the Korea Research Institute of Standards and Science (KRISS) presented their laser pistonphone in a conference paper [39]. The device is similar to the NPL laser pistonphone and calibration equivalences have been demonstrated for modulus and phase at frequencies down to 2 Hz.…”

Section: Overview Of Devices For Calibration Of Infrasound Sensorsmentioning

confidence: 99%

A laser pistonphone designed for absolute calibration of infrasound sensors from 10 mHz up to 20 Hz

Rodrigues¹,

Vincent²,

Barham³

et al. 2023

Preprint

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<p>Demand for calibration at infrasonic frequencies has emerged. It is supported by earth monitoring issues and particularly by the Comprehensive nuclear Test Ban Treaty Organization (CTBTO), which provides a global international coverage for nuclear testing ban, and requires for the IMS (International Monitoring System). In the presentation, a new laser pistonphone design is presented with the objective of establishing primary standards for sound pressure at very low frequencies down to 10 mHz. The piston is a modified accessorized loudspeaker driver whose diameter is equal to the diameter of the front pistonphone cavity. The volume velocity of the piston is measured through a laser interferometer and it was designed to have an upper frequency limit of 20 Hz, to overlap with the reciprocity method of calibration. Particular attention has been given with the-sealing to avoid the pressure leakage loss. The dimensions of the front cavity were designed to allow the calibration of a large variety of sensors, including microphones, barometers, manometers and microbarometers. Examples of calibrations for several sensors are presented with the uncertainty. Finally, the metrological performance of the laser pistonphone is demonstrated by comparing the calibration results with those obtained with alternative methods.</p>

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Section: Overview Of Devices For Calibration Of Infrasound Sensorsmentioning

confidence: 99%

A laser pistonphone designed for absolute calibration of infrasound sensors from 10 mHz up to 20 Hz

Rodrigues¹,

Vincent²,

Barham³

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…In 2020, the NMI of Russian Federation (VNIIFTRI) improved their pistonphone 3202 developed in the 60s to cover the frequency range 0.001 Hz to 50 Hz [38] but it should be noted that this device remains poorly documented, particularly with regards to metrological performance and demonstration of equivalences with other methods of calibration. Finally, the Korea Research Institute of Standards and Science presented their laser pistonphone in a conference paper [39]. The device is similar to the NPL laser pistonphone and calibration equivalences have been demonstrated for modulus and phase at frequencies down to 2 Hz.…”

Section: Overview Of Devices For Calibration Of Infrasound Sensorsmentioning

confidence: 99%

A laser pistonphone designed for absolute calibration of infrasound sensors from 10 mHz up to 20 Hz

et al. 2022

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There has been an increased demand for traceable calibrations at infrasonic frequencies in support of geophysical monitoring applications, an example being the Comprehensive nuclear Test Ban Treaty Organization, which provides a global international coverage for nuclear testing ban, and requires for the International Monitoring System. In this paper, a new laser pistonphone design is presented with the objective of establishing primary standards for sound pressure at very low frequencies down to 10~mHz. The piston is a modified accessorized loudspeaker driver whose diameter is equal to the diameter of the front pistonphone cavity. The volume velocity of the piston is measured through a laser interferometer and the current version was designed to have an upper frequency limit of 20 Hz, to overlap with the closed coupler reciprocity method of calibration. Particular attention has been given to the sealing to avoid the pressure leakage loss. The dimensions of the front cavity were designed to allow the calibration of a large variety of sensors, including microphones, barometers, manometers and microbarometers. Examples of calibrations for several sensors are presented and also an uncertainty budget for the Brüel & Kjaer type 4160 laboratory standard microphones, commonly used for primary calibrations. Finally, the metrological performance of the laser pistonphone is demonstrated by comparing the calibration results with those obtained with alternative methods.

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“…Alternative calibration methods have been developed by NMIs and various universities [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. Among them, the laser pistonphone method originally proposed by the National Physical Laboratory in the United Kingdom has gained prominence [6].…”

Section: Introductionmentioning

confidence: 99%

Investigation of sound pressure leakage effect for primary calibration down to 10⁻² Hz using a laser pistonphone system

Hirano,

Takahashi,

Yamada

et al. 2024

Meas. Sci. Technol.

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Recently, the demand for sensor calibration in the infrasonic range has increased to obtain accurate information when monitoring infrasound generated by large-scale natural disasters. The laser pistonphone method is a primary calibration method to evaluate infrasound sensors in the low-frequency range. The main concern with this method is that sound pressure leakage from an inherent gap significantly changes the acoustic transfer impedance of a pistonphone at lower frequencies. To apply the laser pistonphone method in the low-frequency range down to 10−2 Hz, it is essential to accurately evaluate and compensate for the leakage effect, i.e., the gap’s acoustic transfer impedance. In this study, we propose a technique for experimentally evaluating the gap impedance. The main idea is to determine the total acoustic transfer impedance by dividing the sound pressure by the volume velocity and then deducing the gap impedance by subtracting the chamber impedance from the obtained total acoustic transfer impedance. A digital pressure sensor was used to precisely measure sound pressure below 100 Hz because pressure sensors are suitable for accurate measurement of pressure fluctuations at low frequencies. We validated the proposed approach by calibrating an analog pressure sensor that outputs an analog voltage proportional to the absolute pressure. As a result, the sensitivity calibrated by the laser pistonphone method at 0.02 Hz agreed with the static sensitivity provided by the manufacturer within 0.02 dB.

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Development of a Laser Pistonphone System to Calibrate the Sensitivity Modulus and Phase of Microphones for Infrasonic Frequencies

Cited by 6 publications

References 17 publications

A laser pistonphone designed for absolute calibration of infrasound sensors from 10 mHz up to 20 Hz

A laser pistonphone designed for absolute calibration of infrasound sensors from 10 mHz up to 20 Hz

A laser pistonphone designed for absolute calibration of infrasound sensors from 10 mHz up to 20 Hz

Investigation of sound pressure leakage effect for primary calibration down to 10⁻² Hz using a laser pistonphone system

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Development of a Laser Pistonphone System to Calibrate the Sensitivity Modulus and Phase of Microphones for Infrasonic Frequencies

Cited by 6 publications

References 17 publications

A laser pistonphone designed for absolute calibration of infrasound sensors from 10 mHz up to 20 Hz

A laser pistonphone designed for absolute calibration of infrasound sensors from 10 mHz up to 20 Hz

A laser pistonphone designed for absolute calibration of infrasound sensors from 10 mHz up to 20 Hz

Investigation of sound pressure leakage effect for primary calibration down to 10−2 Hz using a laser pistonphone system

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Investigation of sound pressure leakage effect for primary calibration down to 10⁻² Hz using a laser pistonphone system