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1. 发明授权

US06650810B1 Tunable filter 有权
标题翻译：可调滤波器
公开(公告)号：US06650810B1
公开(公告)日：2003-11-18
申请号：US09639063
申请日：2000-08-15
申请人： Robert A. Lieberman , John D Prohaska , Lothar U Kempen
发明人： Robert A. Lieberman , John D Prohaska , Lothar U Kempen
IPC分类号： G02B634
CPC分类号： G01J3/457 , G01J3/18 , G01J3/1895 , G01J3/4338 , G02B6/02133 , G02B6/02138 , G02B6/022 , G02B6/124 , G02F1/0115 , G02F2201/307
摘要： A tunable optical filter for simulating the waveband spectrums of selected substances. The filter includes an optical waveguide with a core material for transmitting light energy and a nominal core refractive index for the core material. Predetermined periodic variations are formed in the core material of the optical waveguide between the input and output ends that alter the core refractive index of the waveguide at the location of the periodic variations. Depending upon the periodic variations, the waveguide produces a predetermined reference waveband spectrum output that matches the waveband spectrum of a selected substance. A modulator is coupled to the waveguide to selectively modulate the periodic variations to intermittently shift the reference waveband spectrum output to fine tune the filter and reduce signal noise. The filter is useful as a reference cell for correlation spectroscopy, DIAL LIDAR, equipment calibration, and other uses where a predetermined or known waveband spectrum is useful or desirable.
摘要翻译：一种用于模拟所选物质的波段频谱的可调光滤波器。滤波器包括具有用于透射光能的芯材料和用于芯材料的标称芯折射率的光波导。在输入和输出端之间的光波导的芯材中形成预定的周期性变化，其改变在周期性变化的位置处的波导的纤芯折射率。根据周期性变化，波导产生与选定物质的波段频谱相匹配的预定参考波段频谱输出。调制器耦合到波导以选择性地调制周期性变化，以间歇地移动参考波段频谱输出以微调滤波器并降低信号噪声。滤波器可用作相关光谱参考单元，DIAL LIDAR，设备校准以及预定或已知波段频谱是有用或期望的其它用途。

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