Abstract

A new type of amplitude-modulated (AM) reticle constructed by a liquid crystal (LC) cell array finds an excellent application in remote sensing for a flow velocity with unpredictable variation of speed and direction. The LC-AM reticle is a spatiotemporal spatial filter, optoelectrically achieved by using the consequent opaqueness due to the LCs dynamic scattering caused by the electric field sequentially applied to the respective LC cell. A feasibility test for the sensor with a pair of these reticles has measured the flow-velocity vector of a river.

© 1981 Optical Society of America

Optics of flow cells for liquid chromatography

James E. Stewart
Appl. Opt. 20(4) 654-659 (1981)

Analysis of Error Response of Amplitude Modulated Reticles*

Paul E. Mengers and Kathryn B. O’Brien
J. Opt. Soc. Am. 54(5) 668-671 (1964)

Focusing by electrical modulation of refraction in a liquid crystal cell

Stephen T. Kowel, Dennis S. Cleverly, and Philipp G. Kornreich
Appl. Opt. 23(2) 278-289 (1984)

Liquid-crystal twist-cell optics

Ralph J. Gagnon
J. Opt. Soc. Am. 71(3) 348-353 (1981)

Optical scales, reticles, gratings, masks, and standards

D. F. Horne
Appl. Opt. 20(23) 4000-4008 (1981)