Accession Number : ADD012998

Title :   Absorption Path Controlled Filter.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Bailey,Theodore B

Report Date : 05 Mar 1985

Pagination or Media Count : 6

Abstract : A controlled absorption path filter for charge couple device seekers is made using a variable depth fluid. The use of a liquid as an absorber permits the entire aperture area to darken without loss of aperture. Thus the device provides a uniform extinction feature which preserves the system modulation transfer function. The device can be tied to a closed loop system with automation gain control for feedback. Depending on the nature of absorber in the liquid, the device can also serve as a spectral filter. The device is applicable for visible light to near infrared light.

Descriptors :   *PATENTS, *ABSORPTION, *FILTERS, *CLOSED LOOP SYSTEMS, *NEAR INFRARED RADIATION, *TRANSFER FUNCTIONS, *FLUIDS, CONTROL, PATHS, CHARGE COUPLED DEVICES, HOMING DEVICES, SPECTRA, EXTINCTION, LIGHT, VISIBILITY, AUTOMATION, GAIN, INFRARED RADIATION, MODULATION, DEPTH, VARIABLES

Subject Categories : Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE