公开(公告)号：US5036199A

公开(公告)日：1991-07-30

申请号：US481277

申请日：1990-02-20

Applicant: Masakazu Sakata ,  Kenichi Shibata ,  Kousuke Takeuchi ,  Toshiharu Tanaka ,  Hiroshi Okano ,  Toshikazu Tsujino ,  Kazuhiko Kuroki

Inventor： Masakazu Sakata ,  Kenichi Shibata ,  Kousuke Takeuchi ,  Toshiharu Tanaka ,  Hiroshi Okano ,  Toshikazu Tsujino ,  Kazuhiko Kuroki

IPC: G01J5/34 ,  G01J5/62 ,  G02F1/137

CPC classification number: G01J5/34 ,  G01J5/62 ,  G02F1/1375 ,  G01J2005/626 ,  H01L2224/48091 ,  H01L2224/48137

Abstract: A liquid crystal chopper comprising a pair of electrically conductive substrates, a spacer keeping the substrates so as to define a space between the substrates, and a liquid crystal of DSM type which is enclosed in the space, with a dielectric anisotropy of -0.5 or more and not exceeding 0. An infrared sensor using the liquid crystal chopper in the above construction as a chopper mechanism to intermittently interrupt infrared rays incident upon the pyroelectric element. The infrared sensor has a short response time at the liquid crystal chopper and consumes less power.

公开(公告)号：US4694173A

公开(公告)日：1987-09-15

申请号：US785725

申请日：1985-10-09

Applicant: Jacob Y. Wong

Inventor： Jacob Y. Wong

IPC: G01J1/16 ,  G01J3/12 ,  G01J5/62 ,  G01N21/31 ,  G01N21/35 ,  G02F1/01 ,  G01N21/03 ,  G02F1/29

CPC classification number: G01N21/3504 ,  G01J2001/161 ,  G01J2003/1269 ,  G01J2005/626 ,  G01N2021/3129 ,  G01N21/314 ,  G01N21/3518 ,  G02F1/0147

Abstract: A multi-component non-dispersive gas analyzer of a type typically used to measure the concentrations of gases present in automotive emissions and in breath analyzers has no moving parts and employs electrically operated means for effectively inserting and removing a reference cell from the optical path and for selecting a particular filter to determine momentarily the wavelengths of radiation being examined. The means for accomplishing these ends include a substrate on which a layer of vanadium dioxide is deposited. The layer is a good reflector at temperatures greater than 67.degree. C. and reflects only slightly at lower temperatures. The layer is alternately heated by an electrical current and is then allowed to cool to provide the desired optical switching action. This electrically-controlled selectively reflective layer is then used in conjunction with the reference cell and with an array of filters to implement the necessary switching and selection of the components.

Abstract translation: 通常用于测量汽车排放物中和气体分析仪中存在的气体浓度的多组分非分散气体分析仪没有运动部件，并且采用电动装置，用于从光路有效地插入和去除参考电池， 用于选择特定滤波器以确定正在检查的辐射的波长。 用于实现这些端部的方法包括其上沉积有二氧化钒层的基底。 该层在高于67℃的温度下是良好的反射器，并且在较低温度下仅略微反射。 该层被电流交替加热，然后被允许冷却以提供所需的光学切换动作。 然后将该电控选择性反射层与参考单元结合使用并具有一组滤波器以实现组件的必要的切换和选择。