Accession Number : ADD005022

Title :   Narrowband Wide Field of View Optical Filter.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON D C

Personal Author(s) : Richards,William E ; Trias,John A

Report Date : 24 Jan 1978

Pagination or Media Count : 10

Abstract : A wide angle narrowband optical filter is provided by an assembly in which a body member supports multiple absorption materials in a common optical path. Each of the multiple absorption materials contributes toward narrowing the spectral bandwidth region permitting transmittance of light energy. A bandpass glass color filter restricts light transmission to a relatively broad spectral range of approximately 250 nanometers and a selected coumarin dye material in solution used with a second solution of a selected rare earth material narrows the spectral range of transmittance. In a preferred embodiment an interference filter further narrows the transmitting bandwidth to approximately 12.5 nanometers at FWHM (measured at Full Width Half Maximum) in the spectral region which is desirably coincident with the wavelengths of light energy best transmitted in ocean waters. (Author)

Descriptors :   *Patents, *Optical filters, Narrowband, Light transmission, Dyes, Coumarins, Absorption, Materials

Subject Categories : Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE