公开(公告)号：US4917476A

公开(公告)日：1990-04-17

申请号：US168557

申请日：1988-03-04

申请人： Surinder S. Makh ,  Alan D. Hart ,  David L. Tunnicliffe

发明人： Surinder S. Makh ,  Alan D. Hart ,  David L. Tunnicliffe

IPC分类号： G02F1/133 ,  G02F1/141

CPC分类号： G02F1/132 ,  G02F1/141

摘要： It is known to use liquid crystal cells for thermal imaging. However, the sensitivity of the liquid crystal cell is reduced due to the walls of the cell absorbing some of the incident radiation and locally heating the crystal thereby producing localized changes in phase. Liquid crystal materials which have sufficient surface tension to form a film without forming a part of a cell are disclosed where the pitch of the helix of the film exhibits a strong temperature dependence. In one embodiment the liquid crystal film is mounted wtihin a Fabry-Perot resonant cavity so that detection of the change in the crystal due to a change in temperature is enhanced.

摘要翻译： 已知使用液晶单元进行热成像。 然而，由于电池的壁吸收了一些入射的辐射并且局部地加热了晶体，所以液晶单元的灵敏度降低，从而产生相位的局部变化。 公开了具有足够的表面张力以形成膜而不形成电池的一部分的液晶材料，其中膜的螺旋的螺距具有强烈的温度依赖性。 在一个实施例中，液晶膜由Fabry-Perot谐振腔安装，从而提高了由于温度变化引起的晶体变化的检测。