A movable array of environmental sensors is intended for the feed-forward cancellation of the Newtonian noise generated by atmospheric density fluctuations and seismic displacements at the Virgo gravitational wave det...
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ISBN:
(纸本)9798350311075
A movable array of environmental sensors is intended for the feed-forward cancellation of the Newtonian noise generated by atmospheric density fluctuations and seismic displacements at the Virgo gravitational wave detector site, with the prospect of being used at the sites of future 3rd generation detectors. Each robot unit is equipped with a seismic sensor - optionally also a microphone and a magnetometer - for low-noise and low-frequency observations. The robots need to move autonomously in the experimental areas indoors, avoiding obstacles to reach the assigned positions where they start the data acquisition process. Then, the data will be transferred wirelessly to the control software that elaborates them and imparts to all robots the command to move to new optimal positions. Essential requirements of the system are accuracy in positioning and timing. The project is described highlighting the technical choices and their implementation.
The modulation transfer function of optical sparse aperture system is attenuated among the low and middle frequency band, which causes the degradation and blur. Aimed at this problem, the Annulus array with six apertu...
详细信息
ISBN:
(纸本)9781467312745;9781467312721
The modulation transfer function of optical sparse aperture system is attenuated among the low and middle frequency band, which causes the degradation and blur. Aimed at this problem, the Annulus array with six apertures is studied. Firstly, a half of its sub-apertures are moved towards center to respectively acquire the multi-frame images that contain integrated information. Secondly, the move scales are determined via the cut-off frequency and mid-band energy ratio. Finally, image restoration is performed by multi-frame iterative blind deconvolution algorithm. The experimental result shows that the proposed method works well on the sparse aperture image restoration of Annulus array while the reconstruction accuracy has also been validated. Moreover, the design of relative sensor can be innovated by this method.
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