Investigation of microphones as near-ground sensors for seismic detection of buried landmines

Larson, Gregg D.; Martin, James S.; Scott, Waymond R.

doi:10.1121/1.2743155

Cited by 11 publications

(4 citation statements)

References 22 publications

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“…Information about the mechanical properties of the plate and the underlying medium is mainly included in the leaky surface wave, rather than in the direct in-air sound wave. The accuracy of the sound wave analysis can be improved by increasing the relative amplitude of the leaky surface wave to the direct in-air sound wave using a rigid or flexible cup-shaped waveguide [ 21 ]. In this study, a cup-shaped rubber waveguide was attached to the lower part of the microphone.…”

Section: Experimental Studymentioning

confidence: 99%

Estimation of Cavities beneath Plate Structures Using a Microphone: Laboratory Model Tests

Kang

Hong

et al. 2021

Sensors

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The objective of this study is to detect a cavity and estimate its size using sound waves in a laboratory model chamber filled with dry sand. One side of the chamber is covered with an acrylic plate, and a cavity is placed between the plate and sand. Sound waves are generated by impacting the plate with an instrumented hammer, and are measured using a microphone. The measured sound waves are analyzed with four comprehensive analyses including the measured area under the rectified signal envelope (MARSE) energy, flexibility, peak magnitude of wavelet transform, and frequency corresponding to the peak magnitude. The test results show that the accuracy of cavity detection using the MARSE energy is higher for thicker plates, whereas that using flexibility is higher for thinner plates. The accuracies of cavity detection using the peak magnitude of wavelet transform, and frequency corresponding to the peak magnitude are consistently high regardless of the plate thickness. Moreover, the cavity size may be under- or overestimated depending on the plate thickness and the selected analysis method. The average of the cavity sizes estimated by these methods, however, is slightly larger than the actual cavity size regardless of the plate thickness. This study demonstrates that microphones may be effectively used for the identification of a cavity and the estimation of its size.

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Section: Experimental Studymentioning

confidence: 99%

Estimation of Cavities beneath Plate Structures Using a Microphone: Laboratory Model Tests

Kang

Hong

et al. 2021

Sensors

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“…Various sensor systems are widely used in seismic testing and pavement inspection [1,2]. Accurate, economic, and efficient non-destructive testing techniques are highly desired for evaluation of seismic data for infrastructure integrity.…”

Section: Introductionmentioning

confidence: 99%

“…Static systems relying upon an external impact source to produce acoustic signals measureable with an acoustic transducer or an array of acoustic transducers are considered an effective way for any seismic tests, surface and subsurface sensing [2]. One acoustic wave-based method for detecting the seismic data and subsurface pavement profile is the air-coupled surface wave measurement using multichannel analysis of surface wave (MASW) technique [3,4].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Tire Pressure Sensor for Measuring Ground Vibration

Wang

McDaniel

Wang

2012

Sensors

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This work presents a convenient and non-contact acoustic sensing approach for measuring ground vibration. This approach, which uses an instantaneous dynamic tire pressure sensor (DTPS), possesses the capability to replace the accelerometer or directional microphone currently being used for inspecting pavement conditions. By measuring dynamic pressure changes inside the tire, ground vibration can be amplified and isolated from environmental noise. In this work, verifications of the DTPS concept of sensing inside the tire have been carried out. In addition, comparisons between a DTPS, ground-mounted accelerometer, and directional microphone are made. A data analysis algorithm has been developed and optimized to reconstruct ground acceleration from DTPS data. Numerical and experimental studies of this DTPS reveal a strong potential for measuring ground vibration caused by a moving vehicle. A calibration of transfer function between dynamic tire pressure change and ground acceleration may be needed for different tire system or for more accurate application.

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“…마이크로폰 측정부의 하부에는 Fig. 2와 같이 고무 재질의 집음기(Waveguide)를 부착하여 직접파의 진폭을 약화시키고자 하였다(Larson et al, 2007). 해머 타격 후, 해머에 가해진 하중과 마이크로폰으로 측정된 음파 신호 는 오실로스코프(Keysight, DOSX-3014A)를 통하여 나타나 며, 컴퓨터에 저장된다.3.2 모형 토조 조성아스팔트 포장층 하부에 발생한 공동을 모사하기 위하여Fig.…”

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Detection of Cavities Beneath Plate Structure using a Microphone

강¹,

이²,

유³

et al. 2020

J. Korean Soc. Hazard Mitig

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Failure of plate structures such as pavements can be caused by the occurrence of cavities beneath the structure. In this study, a cavity beneath the plate structure were detected in a laboratory model chamber using a hammer and microphone. Specifically, a chamber was constructed using an acrylic plate and dry soil to simulate the pavement and the subgrade, respectively. A plastic box was placed between the acrylic plate and dry soil to simulate a cavity beneath the pavement. The sound waves generated by impacting the acrylic plate with a hammer were measured using a microphone. The measured area under the rectified signal envelope (MARSE) energy was calculated for the measured sound waves, and the variation in it were analyzed according to the measurement location. The test results show that the signal attenuation was low at the cavity section owing to the conservation of impact energy and that the signal amplitude becomes lower at the soil section owing to the weakened flexural vibration. Therefore, the estimated MARSE energy at the cavity section was larger than that at the soil section. This study demonstrates the effective utilization of microphones for detecting cavities beneath the plate structures.

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Investigation of microphones as near-ground sensors for seismic detection of buried landmines

Cited by 11 publications

References 22 publications

Estimation of Cavities beneath Plate Structures Using a Microphone: Laboratory Model Tests

Estimation of Cavities beneath Plate Structures Using a Microphone: Laboratory Model Tests

Dynamic Tire Pressure Sensor for Measuring Ground Vibration

Detection of Cavities Beneath Plate Structure using a Microphone

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