Accession Number : AD0622119

Title :   MEASUREMENT OF WIND SHEAR.

Descriptive Note : Rept. no. 4 (Final), 1 Jul 62-1 Sep 64,

Corporate Author : TECHNOLOGY INC DAYTON OHIO

Personal Author(s) : Phillips,N. S. ; Jeffries,R. L. ; Eifert,M. C.

Report Date : 01 SEP 1964

Pagination or Media Count : 96

Abstract : The latest wind shear measurement system consists of a revised probe configuration and a ground station capable of transcribing telemetered data in digital form onto magnetic tape. The external configuration of the probe was modified by adding a convergent ring wing and canard surfaces to the design developed under Contract DA 36-039 SC-75064. These modifications were necessary to provide the drag and proper stability required for a 'tuned' probe capable of carrying the volume and weight of the selected sensors. The instrumentation package was designed to accommodate commercially available accelerometers, an aspect sensor, and pressure transducers. The probe with the external modifications was tested satisfactorily by two wind tunnel programs conducted at the Air Force Institute of Technology. The ground system consists of an Ampex FR 300 digital tape transport, a GMD-1 Rawin standard receiver, an encoder, and a readout matrix. Data telemetered from the probe is received, encoded, and transcribed onto magnetic tape at a density of 200 characters per inch. The parameters recorded are dynamic and static pressure, horizontal accelerations, and azimuth. These are written in a format compatible with IBM computers and specifically designed for Fortran computation. Field tests were conducted at NASA Wallops Island Station. These verified the feasibility of the wind shear probe concept and provided numerous data in a form suitable for thorough investigation. During the tests the ground station performed as designed; however, instrumentation and launch problems prevented a completely successful program. (Author)

Descriptors :   (*WIND, MEASUREMENT), (*METEOROLOGICAL INSTRUMENTS, FREE FALL MODELS), (*TELEMETER SYSTEMS, ATMOSPHERIC SOUNDING), (*ATMOSPHERIC SOUNDING, TELEMETER SYSTEMS), AIRBORNE, ANEMOMETERS, AERODYNAMIC CONFIGURATIONS, DATA TRANSMISSION SYSTEMS, DIGITAL SYSTEMS, MAGNETIC RECORDING SYSTEMS, ENVIRONMENTAL TESTS, WIND TUNNEL MODELS

Distribution Statement : APPROVED FOR PUBLIC RELEASE