Accession Number:

AD0683114

Title:

ORGANIC ABSORPTION LIGHT FILTERS OF THE CUTOFF TYPE FOR THE SPECTRAL REGION 310-500 nm,

Descriptive Note:

Corporate Author:

FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Report Date:

1968-07-30

Pagination or Media Count:

12.0

Abstract:

The authors describe new light filters of the cutoff type, which absorb short-wave radiation and transmit the long-wave part of the spectrum. The base of the filter was polymethylmethacrylate, and the light-absorbing additives were derivatives of cyclopropane, benzophenone, ethers of substituted benzoyl and benzalcyanacetic acids, as well as a number of new compounds from the flavon, coumaran, fourocoumaran, and other compounds. Altogether, sixty-five different substances were tested, some for the first time. The filters were produced by a standard technology and tested for moisture absorption heat endurance, and optical properties. A table listing the transmission edge of the most typical filters defined as the wavelength at which the transmission coefficient is half the maximum value and plots of the transmission curves are presented. Most filters have an optical density exceeding 3 and a transmission of 92 in the working region. Methods of shifting the transmission edge by varying the amount of chemical additive are discussed.

Subject Categories:

  • Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE