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ABSTRACT: A novel fiber reference optical readout method was proposed in the bi-material micro cantilever infrared imaging system, which consists of an infrared imaging channel, an optical readout channel and a fiber reference channel. The fiber reference channel is used to monitor the intensity fluctuation of the light source, and provide a signal to correct the distortion of the infrared images from the optical readout channel. Comparing with the typical optical readout method without any references, the noise equivalent temperature difference (NETD) of such an infrared imaging system with the fiber reference optical readout method can be reduced by about 33% and edges of the IR images become clearer.
Optics Express 04/2012; 20(9):9516-22. · 3.59 Impact Factor
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ABSTRACT: This paper presents a novel filtering method with a double triangular prism in an optical-readout thermal imaging system. First, the working principle of this system is described in detail, followed by the analysis of sensitivity. Then, infrared images of hands are obtained. On the basis of the analysis, it is concluded that this filtering method, whose noise equivalent temperature difference (NETD) can reach 145 mK, is effective in obtaining high-quality images. Finally, comparing the filtering method with a knife-edge filter, we can draw the conclusion that the filtering method can effectively improve image quality (the value of NETD is less than that of a knife-edge filter).
Applied Optics 02/2012; 51(5):669-75. · 1.41 Impact Factor
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ABSTRACT: We report the experimental results to continuously tune the coherence length of a semiconductor laser using an optical feedback scheme. The coherence length can be controlled by adjusting the feedback strength when a semiconductor laser operates in a coherence collapse regime. Fine structures of the fringe visibility of the laser output show that the coherence length of the semiconductor laser can be shortened from several meters of the solitary laser to 100 microm by the long-cavity optical feedback technique. Experimental results indicate that the coherence length of the laser, depending strongly on the feedback strength, is insensitive to its bias current.
Applied Optics 03/2009; 48(5):969-73. · 1.41 Impact Factor
