Measurement of ultrasonic transmission attenuation characteristics of canvas fabric

Hoshiba, Kotaro; Hirata, Shinnosuke; Hachiya, Hiroyuki

doi:10.1250/ast.36.171

Cited by 8 publications

(9 citation statements)

References 17 publications

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“…The attenuation coefficient

is related to the medium type, being lower for liquids, such as water, and higher for solids, such as bone [ 21 ]. Fabric material also has the characteristic of acoustic attenuation [ 22 , 23 ]. Then, the type of clothing in auscultation affects the degree of acoustic attenuation.…”

Section: Methodsmentioning

confidence: 99%

Suppression of Clothing-Induced Acoustic Attenuation in Robotic Auscultation

Tsumura

Umezawa

Morishima

et al. 2023

Sensors

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For patients who are often embarrassed and uncomfortable when exposing their breasts and having them touched by physicians of different genders during auscultation, we are developing a robotic system that performs auscultation over clothing. As the technical issue, the sound obtained through the clothing is often attenuated. This study aims to investigate clothing-induced acoustic attenuation and develop a suppression method for it. Because the attenuation is due to the loss of energy as sound propagates through a medium with viscosity, we hypothesized that the attenuation is improved by compressing clothing and shortening the sound propagation distance. Then, the amplitude spectrum of the heart sound was obtained over clothes of different thicknesses and materials in a phantom study and human trial at varying contact forces with a developed passive-actuated end-effector. Our results demonstrate the feasibility of the attenuation suppression method by applying an optimum contact force, which varied according to the clothing condition. In the phantom experiments, the attenuation rate was improved maximumly by 48% when applying the optimal contact force (1 N). In human trials, the attenuation rate was under the acceptable attenuation (40%) when applying the optimal contact force in all combinations in each subject. The proposed method promises the potential of robotic auscultation toward eliminating gender bias.

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“…The attenuation coefficient

Section: Methodsmentioning

confidence: 99%

Suppression of Clothing-Induced Acoustic Attenuation in Robotic Auscultation

Tsumura

Umezawa

Morishima

et al. 2023

Sensors

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“…To improve the signal-to-noise ratio (SNR) of the echo, pulse compression using a maximum-length sequence (Msequence) was employed [4,6,9,14,15]. An M-sequence is a pseudo-random binary code generated from a linear feedback shift register (LFSR).…”

Section: Methodsmentioning

confidence: 99%

“…Ultrasonic transducers [1] are widely used to acquire target information such as position and motion [2][3][4][5] and medium information such as the speed of sound and attenuation [6][7][8][9], and for nondestructive testing [10][11][12][13]. In particular, the distance to a target is typically measured using an echo reflected from the target, i.e., the pulse-echo method.…”

Section: Introductionmentioning

confidence: 99%

Measurement of road surfaces by reflection characteristics of airborne ultrasound

Hirata

Sun

Ueda

et al. 2016

Acoust. Sci. & Tech.

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Section: Introduction and Literature Reviewmentioning

confidence: 96%

“…Many studies on the acoustic properties of thin medium have been carried out. 15 The acoustic transmission attenuation characteristics of thin medium-like canvas fabric using an ultrasound at frequencies over 20 kHz have been revealed by Hoshiba et al 16 In order to detect an object hidden inside or behind a thin media, detecting shapes of the hidden objects is one of the primary tasks. An autonomous robot must be equipped with a set of sensors that have small dimensions, low power consumption and real-time performance.…”

Section: Introduction and Literature Reviewmentioning

confidence: 99%

Shape detection of object behind thin medium using ultrasonic sensors

Win

Afzulpurkar

Punyasai

2018

International Journal of Advanced Robotic Systems

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This research aims to develop a novel method for recognizing the shape of an object located behind thin medium utilizing combination of ultrasonic sensor signal and edge detection technique. This system is extensively designed so that it can be easily mounted on a surveillance autonomous ground vehicle and is robust for operating in a hazardous environment. Once the autonomous ground vehicle reaches near the hidden objects, the proposed ultrasonic sensor system will identify shapes of the objects. Generally, the number of different sensors mounted on the robot and the number of tasks related to navigation, exploration and detection operation make the design of the autonomous ground vehicle control system very complex. The proposed ultrasonic sensing system for an autonomous ground vehicle provides two-dimensional shape information with low computational cost and will not add significant computational burden to the autonomous ground vehicle's overall control system. At first, a mathematical model for the ultrasonic sensor is created to find the relationships between the attenuation coefficient, the transmission coefficient, the thickness of the medium and ultrasonic wavelength. The mathematical model is followed by numerical simulation to establish several design parameters. Finally, a prototype for the proposed shape detection system is developed using the kHz range off-the-shelf ultrasonic sensors and edge detection technique. Experimental results confirmed that the accuracy of the proposed mathematical model and shape of an object located behind a thin medium could be estimated successfully. It was concluded from the results that the developed novel method was useful for identifying objects located behind thin media and this will help in conducting the further development of research for surveillance and rescue operation using the autonomous ground vehicle.

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Measurement of ultrasonic transmission attenuation characteristics of canvas fabric

Cited by 8 publications

References 17 publications

Suppression of Clothing-Induced Acoustic Attenuation in Robotic Auscultation

Suppression of Clothing-Induced Acoustic Attenuation in Robotic Auscultation

Measurement of road surfaces by reflection characteristics of airborne ultrasound

Shape detection of object behind thin medium using ultrasonic sensors

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