Accession Number:

ADD012998

Title:

Absorption Path Controlled Filter.

Descriptive Note:

Patent,

Corporate Author:

DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s):

Report Date:

1985-03-05

Pagination or Media Count:

6.0

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.

Subject Categories:

  • Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE