The Design and Construction of an Acoustic Imaging System for Imaging Underground Facilities

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ARDINI M.; Tamimi A.; Khodadadi H. R.; BASHIRI A.; Bayrami Y.

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Journal: JOURNAL OF RADAR Year:2021 | Volume:9 | Issue:1 Page(s): 45-55

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Title

The Design and Construction of an Acoustic Imaging System for Imaging Underground Facilities

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Keywords

Acoustic Impedance

Acoustic Imaging

Correlation Function

Abstract

As underground hidden facilities are used for various applications, imaging systems are required for the detection and recognition of these facilities. In this paper, imaging by mechanical wave propagation in the soil is investigated. Most underground facilities can be considered as air chambers located in the middle of the soil. Air and soil have a large difference in Acoustic Impedance, so underground facilities can produce a large reflective signal because the amplitude of the reflected signal depends on the difference in impedance of the two materials. Seismic and non-destructive concrete testing systems also use the process of propagation of mechanical waves in the material. Although seismic systems have been successful in the detection issue, they require several meters of space for equipment layout, and transportation complexity is also one of their problems. They are unsuitable for urban space because they are inherently designed to detect water sources at depths of several hundred meters. On the other hand, while the non-destructive concrete testing system equipment have suitable dimensions, they have low penetration depth which is impractical for this purpose. Seismic and non-destructive testing systems of concrete operate in the range of subsonic and ultrasonic waves, respectively. This research project proposes the idea that by choosing an operating frequency between the two mentioned ranges, it is possible to obtain equipment with the appropriate dimensions for imaging underground facilities. In this project we managed to image an underground constructed cylindrical cavity with the diameter of 1 meter and the depth of 4 meters. The accuracy of this method depends on the sound propagation speed in the material. Since there are accurate relationships for the propagation speed of sound in air, the diameter of the cylinder was estimated with an accuracy of about 4%, but with the measurement of propagation speed being infeasible in this project, leading to the ambiguity in the value of propagation speed of sound in soil, the values cited in several reference sites were used, giving the accuracy of 4 to 20%.

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APA: Copy

ARDINI, M., Tamimi, A., Khodadadi, H. R., BASHIRI, A., & Bayrami, Y.. (2021). The Design and Construction of an Acoustic Imaging System for Imaging Underground Facilities. JOURNAL OF RADAR, 9(1 ), 45-55. SID. https://sid.ir/paper/954987/en

Vancouver: Copy

ARDINI M., Tamimi A., Khodadadi H. R., BASHIRI A., Bayrami Y.. The Design and Construction of an Acoustic Imaging System for Imaging Underground Facilities. JOURNAL OF RADAR[Internet]. 2021;9(1 ):45-55. Available from: https://sid.ir/paper/954987/en

IEEE: Copy

M. ARDINI, A. Tamimi, H. R. Khodadadi, A. BASHIRI, and Y. Bayrami, “The Design and Construction of an Acoustic Imaging System for Imaging Underground Facilities,” JOURNAL OF RADAR, vol. 9, no. 1 , pp. 45–55, 2021, [Online]. Available: https://sid.ir/paper/954987/en

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