A fast response suspended core fiber optical gas sensor configuration using side-opening hole and micro-holes array
structure on the thin layers is proposed. The side-opening-hole structure enables a fast filling speed of gases into the
opening-up-hole region, while the micro-holes array on the thin layers ensures that gases could further diffuse into
the other holes columns quickly. Meanwhile, its sensitivity could be tripled in contrast to the previous structures.
Simulation results show that a diffusion limited response time of 12 s could be realized and thus move a step further
toward real-time sensing applications.
A fast response tilted fiber Bragg grating fluid refractometer using an exposed-hole microstructured optical fiber is
proposed and analyzed. The theoretical and simulation results show that a sensitivity of 5.40×10-5 r.i.u within a diffusion
limited response time of 6 s could be achieved. This exposed-hole configuration can be used to construct a fluid
refractometer for achieving a fast response, high sensitive distributed detection.
This paper deals with subpixel accuracy Synthetic Aperture Radar (SAR) image registration which also satisfies
real-time demand of SAR image processing. Because of the presence of speckle noise in SAR image, improved region
detection method are carried on in reference image and sensed image respectively firstly. Then each region is represented
by a set of invariant moments and chain coding of the region boundary. Correspondence between the regions in the
reference image and sensed image is established by the improved regions matching criterion which proposed by us. The
centers of gravity and the corners on the region boundary are the potential control points. Correspondence between the
control points is established in the feature space, using the principle of minimum distance classifier. After finding
enough and right matched control points, interpolation and estimation of transformation parameters using least squares
method are executed finally.
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