The Experts below are selected from a list of 156 Experts worldwide ranked by ideXlab platform
Jong H. Chow - One of the best experts on this subject based on the ideXlab platform.
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Multi-target CW interferometric acoustic measurements on a single optical beam
Optics Express, 2019Co-Authors: Ya Zhang, Chathura P. Bandutunga, Malcolm B. Gray, Jong H. ChowAbstract:We present a free-space, continuous-wave laser interferometric system capable of multi-target dynamic phase measurement at acoustic frequencies up to a Nyquist bandwidth of 10.2 kHz. The system uses Digitally-enhanced Heterodyne Interferometry to Range Gate acoustic signals simultaneously from multiple in-line reflections while isolating coherent cross-talk between them. We demonstrate sub-nanometer displacement sensitivity across the audio band for each individual reflection surface and 1.2 m resolution between successive surfaces. Signals outside the 1.2 m Range-Gate of the system were suppressed by greater than 30 dB in amplitude, enabling high fidelity independent acoustic measurements.
Ya Zhang - One of the best experts on this subject based on the ideXlab platform.
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Multi-target CW interferometric acoustic measurements on a single optical beam
'The Optical Society', 2020Co-Authors: Ya Zhang, Bandutunga Chathura, Gray, Malcolm B, Chow JongAbstract:We present a free-space, continuous-wave laser interferometric system capable of multi-target dynamic phase measurement at acoustic frequencies up to a Nyquist bandwidth of 10.2 kHz. The system uses Digitally-enhanced Heterodyne Interferometry to Range Gate acoustic signals simultaneously from multiple in-line reflections while isolating coherent cross-talk between them. We demonstrate sub-nanometer displacement sensitivity across the audio band for each individual reflection surface and 1.2 m resolution between successive surfaces. Signals outside the 1.2 m Range-Gate of the system were suppressed by greater than 30 dB in amplitude, enabling high fidelity independent acoustic measurements.Australian Government Research Training Program (RTP) Scholarshi
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Multi-target CW interferometric acoustic measurements on a single optical beam
Optics Express, 2019Co-Authors: Ya Zhang, Chathura P. Bandutunga, Malcolm B. Gray, Jong H. ChowAbstract:We present a free-space, continuous-wave laser interferometric system capable of multi-target dynamic phase measurement at acoustic frequencies up to a Nyquist bandwidth of 10.2 kHz. The system uses Digitally-enhanced Heterodyne Interferometry to Range Gate acoustic signals simultaneously from multiple in-line reflections while isolating coherent cross-talk between them. We demonstrate sub-nanometer displacement sensitivity across the audio band for each individual reflection surface and 1.2 m resolution between successive surfaces. Signals outside the 1.2 m Range-Gate of the system were suppressed by greater than 30 dB in amplitude, enabling high fidelity independent acoustic measurements.
Yuliang Qin - One of the best experts on this subject based on the ideXlab platform.
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Improvement in SNR by Adaptive Range Gates for RCS Measurements in the THz Region
Electronics, 2019Co-Authors: Shuang Pang, Yang Zeng, Qi Yang, Bin Deng, Hongqiang Wang, Yuliang QinAbstract:One of the major concerns in radar cross-section (RCS) measurements is the isolation of the target echo from unwanted spurious signals. Generally, the method of software Range Gate is applied to extract useful data. However, this method may not work to expectations, especially for targets with a large length-width ratio. This is because the effective target zone is dependent on the aspect angle. The implementation of conventional fixed Range Gates will introduce an uneven clutter signal that leads to a decline in signal-to-noise ratio. The influence of this uneven clutter signal becomes increasingly severe in the terahertz band, where the wavelength is short and the illumination power is weak. In this work, the concept of adaptive Range Gates was adopted to extract a target echo of higher accuracy. The dimension of the Range Gate was determined by the angle-dependent radial projection of the target. In order to evaluate the performance of the proposed method, both experimental measurements and numerical simulations were conducted. Noticeable improvements in the signal-to-noise ratio at certain angles were observed.
Chathura P. Bandutunga - One of the best experts on this subject based on the ideXlab platform.
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Multi-target CW interferometric acoustic measurements on a single optical beam
Optics Express, 2019Co-Authors: Ya Zhang, Chathura P. Bandutunga, Malcolm B. Gray, Jong H. ChowAbstract:We present a free-space, continuous-wave laser interferometric system capable of multi-target dynamic phase measurement at acoustic frequencies up to a Nyquist bandwidth of 10.2 kHz. The system uses Digitally-enhanced Heterodyne Interferometry to Range Gate acoustic signals simultaneously from multiple in-line reflections while isolating coherent cross-talk between them. We demonstrate sub-nanometer displacement sensitivity across the audio band for each individual reflection surface and 1.2 m resolution between successive surfaces. Signals outside the 1.2 m Range-Gate of the system were suppressed by greater than 30 dB in amplitude, enabling high fidelity independent acoustic measurements.
Malcolm B. Gray - One of the best experts on this subject based on the ideXlab platform.
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Multi-target CW interferometric acoustic measurements on a single optical beam
Optics Express, 2019Co-Authors: Ya Zhang, Chathura P. Bandutunga, Malcolm B. Gray, Jong H. ChowAbstract:We present a free-space, continuous-wave laser interferometric system capable of multi-target dynamic phase measurement at acoustic frequencies up to a Nyquist bandwidth of 10.2 kHz. The system uses Digitally-enhanced Heterodyne Interferometry to Range Gate acoustic signals simultaneously from multiple in-line reflections while isolating coherent cross-talk between them. We demonstrate sub-nanometer displacement sensitivity across the audio band for each individual reflection surface and 1.2 m resolution between successive surfaces. Signals outside the 1.2 m Range-Gate of the system were suppressed by greater than 30 dB in amplitude, enabling high fidelity independent acoustic measurements.