Accession Number : ADA328828

Title :   Determining the Gamma of a Night Vision Device.

Descriptive Note : Interim rept. Jun-Nov 94,

Corporate Author : NAVAL AIR WARFARE CENTER TRAINING SYSTEMS DIV ORLANDO FL

Personal Author(s) : Allen, John H. ; Hebb, Richard C.

PDF Url : ADA328828

Report Date : AUG 1997

Pagination or Media Count : 35

Abstract : The purpose of this report is to document a series of laboratory investigations and measurements beginning June 1994, relating to the imaging characteristics of a third generation Night Vision Device (NVD) operating under various input conditions. It also relates this information to environmental conditions encountered and subsequently recorded during preliminary field experiments. During data collection, a specially designed nine-patch gray scale target was evenly illuminated by a source. A third generation night vision monocular, with operational characteristics similar to that of the ANVIS, was aligned on an optical bench and focused onto the target. A photometer was used to measure the monocular target image at the fiber-optic bundle output. The irradiant energy directed at the target by the source was varied which, in turn, varied the average photocathode incident energy. At each change in irradiance, photopic measurements were made of the gray scale patch image displayed on the monocular output. By examining the relative luminance of the patches at the output and comparing it to the input NVIS radiance of the patches, the gamma of the NVD was determined. The data indicate that imagery produced by this particular NVD monocular will have a gamma close to unity.

Descriptors :   *NIGHT VISION DEVICES, FIBER OPTICS, INPUT, OUTPUT, OPTICAL EQUIPMENT, FIELD TESTS, TARGETS, RADIANCE, IMAGES, DATA ACQUISITION, INFRARED EQUIPMENT, LUMINANCE, GRAY SCALE, PHOTOCATHODES, BUNDLES, PHOTOMETERS.

Subject Categories : Infrared Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE