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    • 10. 发明申请
    • MULTI-CONJUGATE LIQUID CRYSTAL TUNABLE FILTER
    • 多串联液晶可调滤波器
    • US20080007813A1
    • 2008-01-10
    • US11112654
    • 2005-04-22
    • Xinghua WangChenhui Wang
    • Xinghua WangChenhui Wang
    • G02F1/03
    • G02B5/28G02B27/288G02F1/13473G02F1/1393G02F2202/40G02F2203/055
    • A hyper-spectral imaging filter has serial stages along an optical signal path with angularly distributed birefringent retarders and polarizers forming interference filters. The retarders can include tunable birefringent elements such as liquid crystals controlled in unison, fixed retarders and/or combined tunable and fixed birefringences. Distinctly different periodic transmission spectra are provided by different filter stages, each having multiple retarders, in particular with some stages having broad bandpass peaks at wide spectral spacing and other stages have very narrow closely spaced peaks. The respective spectra include at least one tunably selectable band at which the transmission spectra of the filter stages coincide, whereby the salutary narrow bandpass and wide spectral spacing ranges of different stages apply together, resulting in a high finesse wavelength filter suitable for spectral imaging.
    • 超光谱成像滤光器沿着具有角分布的双折射延迟器和形成干涉滤光器的偏振器的光信号路径具有串联级。 延迟器可以包括可调谐的双折射元件,例如一致控制的液晶,固定延迟器和/或组合的可调谐和固定的双折射。 不同的过滤阶段提供了不同的周期透射光谱,每个滤光片具有多个延迟器,特别是在宽光谱间隔处具有宽带通峰的一些阶段,其他阶段具有非常窄的紧密间隔的峰。 各个频谱包括至少一个可调谐可选择的频带,滤波器级的传输频谱在该频带处重合,由此不同阶段的有益窄带通和宽频谱间隔范围一起应用,导致适合于光谱成像的高精细波长滤波器。