Thermal imagers using liquid crystal sensing elements

Details Thermal imagers using liquid crystal sensing elements Thermal imagers using liquid crystal sensing elements

1988-03-04

1990-04-17

Miller, Stanley D.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

350347R, 350338, 250331, G02F 113

Patent

active

049174762

ABSTRACT:
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.

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