Accession Number : AD0455096


Title :   INVESTIGATION OF PHOTOCONDUCTOR MATERIALS FOR A SOLID-STATE SONAR DISPLAY.


Descriptive Note : Interim development rept. no. 3, 13 Oct 64-14 Jan 65.


Corporate Author : GENERAL TELEPHONE AND ELECTRONICS LABS INC BAYSIDE N Y


Report Date : 25 Jan 1965


Pagination or Media Count : 11


Abstract : The purpose of this contract is to develop and construct a solid-state sonar display of variable persistence. The display device utilizes a layer of electroluminescent material to generate the output light and a control layer of photoconductive material which accepts an input illumination from a servo-driven wand. An opaque enamel layer between the other two layers is used to prevent optical coupling between the display output light or ambient illumination and the control photoconductor. Full-size display panels with the 50 range elements and 36 angular positions have been constructed. The photoconductor was sintered onto the panels in a specially designed two-zone furnace. Good brightness and brightness-decay uniformity have been achieved. Decay to one tenth of original brightness of 9 sec maximum and 250 ms minimum were obtained. The filter circuits of the Government-furnished equipment were tuned and the whole system performance was evaluated with an input generated by two types of simulators. One of the simulators was synchronous and generated an input which produced a fixed pattern on the display panel. A second simulator produced a constantly changing trace on the display. Both of these tests confirmed earlier predictions that the bandwidth of the filters did not permit a single element output on the panel. (Author)


Descriptors :   *PHOTOELECTRIC MATERIALS , *ELECTROLUMINESCENCE , SONAR EQUIPMENT , DISPLAY SYSTEMS , SONAR EQUIPMENT , SIMULATION , PHOTOCONDUCTIVITY , BRIGHTNESS , TIME , MEASUREMENT , SERVOMECHANISMS


Distribution Statement : APPROVED FOR PUBLIC RELEASE