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    • 89. 发明授权
    • Optical transducers based on liquid crystalline phases
    • 基于液晶相的光学传感器
    • US6137576A
    • 2000-10-24
    • US122884
    • 1998-07-28
    • Detlef PauluthJoachim KrauseGunter GauglitzBernd Drapp
    • Detlef PauluthJoachim KrauseGunter GauglitzBernd Drapp
    • G01N21/45G01B9/02
    • G01N21/45
    • Optical transducers for measuring a contaminant in a gas are disclosed, whereby said contaminant interacts with a liquid crystalline phase as a sensing element in a flow cell. According to the invention nematic crystalline phases on a orientation layer are used. Means are provided to measure or to detect changes of the refractive index of said liquid crystalline phase caused by interaction of said contaminant with said liquid crystalline phase. In preferred embodiments the means for measuring or for detecting the refractive index is a Mach-Zehnder interferometer, a grating coupler, or a device for e.g. visual detection, whereby the flow cell is placed between two linearly polarizing filters, and whereby the two axis of polarization are crossed. Furthermore optical transducers are disclosed, which contain an isotropic dopant in a liquid crystalline phase. Also disclosed is the use of these optical transducers for detecting or measuring contaminants in gases using an optical transducer according to the invention.
    • 公开了用于测量气体中的污染物的光学传感器,由此所述污染物与作为流动池中的感测元件的液晶相相互作用。 根据本发明,使用取向层上的向列结晶相。 提供了用于测量或检测由所述污染物与所述液晶相的相互作用引起的所述液晶相的折射率的变化的装置。 在优选实施例中,用于测量或检测折射率的装置是马赫 - 曾德尔干涉仪,光栅耦合器, 视觉检测,由此将流动池放置在两个线性偏振滤光器之间,并且由此两个极化轴交叉。 此外,公开了在液晶相中含有各向同性掺杂剂的光学传感器。 还公开了使用这些光学传感器来使用根据本发明的光学换能器来检测或测量气体中的污染物。