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公开(公告)号：US5706092A
公开(公告)日：1998-01-06
申请号：US786003
申请日：1997-01-21
摘要： A differential spectrometry system detects very narrow-band spectral features, while providing much higher optical transmittance and signal-to-noise ratios than prior optical-filter-based spectrometer systems. A plurality of light detectors (10a, 10b) detect light that falls within respective wide wavebands. The wide wavebands have overlapping and non-overlapping portions, one of which is the desired narrow waveband. The detector outputs are operated upon to produce an output signal (22) which includes substantially only the desired narrow waveband. In the preferred embodiment, the light detectors (10a, 10b) are implemented with a pair of optical detectors (30a, 30b) and respective optical interference filters (24a, 24b). The filters have substantially identical cut-off wavelengths (.lambda..sub.2) and cut-on wavelengths that are shifted by .DELTA..lambda. with respect to each other (.lambda..sub.1 and (.lambda..sub.1 +.DELTA..lambda.), respectively). The detector outputs are differenced with an operational amplifier (33), so that detector signals resulting from spectral features common to both detectors (30a, 30b) are canceled. The remaining signal (36) varies according to the amount of light that falls between wavelength boundaries �.lambda..sub.1 and (.lambda..sub.1 +.DELTA..lambda.)!. A preferred method of fabricating the optical interference filters (24a, 24b) is also provided.
摘要翻译： 差分光谱系统检测非常窄带的光谱特征，同时提供比现有的基于光学滤光器的光谱仪系统更高的光透射率和信噪比。 多个光检测器（10a，10b）检测落入各个宽波段内的光。 宽波段具有重叠和不重叠的部分，其中一个是期望的窄波段。 操作检测器输出以产生输出信号（22），其基本上仅包括期望的窄波段。 在优选实施例中，光检测器（10a，10b）由一对光学检测器（30a，30b）和相应的光学干涉滤光器（24a，24b）来实现。 滤光器具有基本上相同的截止波长（λ2）和相对于彼此（λ1和（λ1+ΔTATAλ））偏移DELTAλ的截止波长。 检测器输出与运算放大器（33）不同，从而消除由两个检测器（30a，30b）共同的光谱特征产生的检测器信号。 剩余信号（36）根据波长边界（λ1和（λ1+ΔTATA））之间的光量而变化。 还提供了制造光学干涉滤光器（24a，24b）的优选方法。
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公开(公告)号：US5624709A
公开(公告)日：1997-04-29
申请号：US480223
申请日：1995-06-07
摘要： A differential spectrometry system detects very narrow-band spectral features, while providing much higher optical transmittance and signal-to-noise ratios than prior optical-filter-based spectrometer systems. A plurality of light detectors (10a, 10b) detect light that falls within respective wide wavebands. The wide wavebands have overlapping and non-overlapping portions, one of which is the desired narrow waveband. The detector outputs are operated upon to produce an output signal (22) which includes substantially only the desired narrow waveband. In the preferred embodiment, the light detectors (10a, 10b) are implemented with a pair of optical detectors (30a, 30b) and respective optical interference filters (24a, 24b). The filters have substantially identical cut-off wavelengths (.lambda..sub.2) and cut-on wavelengths that are shifted by .DELTA..lambda. with respect to each other (.lambda..sub.1 and (.lambda..sub.1 +.DELTA..lambda.), respectively). The detector outputs are differenced with an operational amplifier (33), so that detector signals resulting from spectral features common to both detectors (30a, 30b) are canceled. The remaining signal (36) varies according to the amount of light that falls between wavelength boundaries [.lambda..sub.1 and (.lambda..sub.1 +.DELTA..lambda.)]. A preferred method of fabricating the optical interference filters (24a, 24b) is also provided.
摘要翻译： 差分光谱系统检测非常窄带的光谱特征，同时提供比现有的基于光学滤光器的光谱仪系统更高的光透射率和信噪比。 多个光检测器（10a，10b）检测落入各个宽波段内的光。 宽波段具有重叠和不重叠的部分，其中一个是期望的窄波段。 操作检测器输出以产生输出信号（22），其基本上仅包括期望的窄波段。 在优选实施例中，光检测器（10a，10b）由一对光学检测器（30a，30b）和相应的光学干涉滤光器（24a，24b）来实现。 滤光器具有基本上相同的截止波长（λ2）和相对于彼此（λ1和（λ1+ΔTATAλ））偏移DELTAλ的截止波长。 检测器输出与运算放大器（33）不同，从而消除由两个检测器（30a，30b）共同的光谱特征产生的检测器信号。 剩余信号（36）根据波长边界（λ1和（λ1+ΔTATA））之间的光量而变化。 还提供了制造光学干涉滤光器（24a，24b）的优选方法。
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公开(公告)号：US4885463A
公开(公告)日：1989-12-05
申请号：US237911
申请日：1988-08-29
IPC分类号： G01R31/265
CPC分类号： G01R31/2656 , G01J5/522
摘要： Two broad blackbody sources (24, 26) having a constantly maintained temperature differential therebetween are alternately directed via a chopper (40) onto a detector array (12) for testing same.
摘要翻译： 在它们之间具有恒定保持的温度差的两个宽黑体源（24,26）经由斩波器（40）交替地被引导到检测器阵列（12）上以进行测试。
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