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Conventionally, images are normally displayed by amplitude or intensity information. However, the frequency information is significantly important in acoustic images since the frequency information can reflect the object characteristics (surface profiles, structures hidden under surfaces, and material properties of objects). In this study, we propose a method of displaying frequency information in...
Conventionally, images are normally displayed by amplitude or intensity information. However, acoustic images are different from optical images. The frequency information is significantly important in acoustic images since the frequency information can reflect the object characteristics (surface profiles, structures hidden under surfaces, and material properties of objects). In this study, we propose...
It is difficult to capture pure speech signals with a single acoustic sensor since the speech signal and noise signal are often overlapped in the spectrum. Besides, it is also hard to receive the three-dimensional and real-time acoustic data of measured objects by a single acoustic sensor. In this paper, we propose a new type 2-D acoustic sensor array based on graphene film, which consists of 256...
Acoustic sensors are used for tracking, amplifying, and transferring sound signal widely. There are some limitations on the traditional acoustic sensors, however, such as narrow bandwidth and low sensitivity. It is extremely difficult to capture pure sound signal with a single acoustic sensor since the noise signal and speech signal are often overlapped in the spectrum. We present a two-dimensional...
To analyze the broadband scattering of the composite bodies of revolution (BORs), the marching-on-in-degree (MOD) scheme with volume-surface integral equation (VSIE) are proposed in this paper. In terms of the rotational symmetric property, only the transverse plane needs to be meshed in the dielectric parts, as the generatrix is divided into segements on the metallic surface. And then the RWG-like...
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