Accession Number : AD0800922

Title :   ELECTRO OPTICAL SIGNAL PROCESSING TECHNIQUES FOR PHASED ARRAY ANTENNAS.

Descriptive Note : Quarterly progress rept. no. 7, 1 Apr-30 Jun 66,

Corporate Author : COLUMBIA UNIV NEW YORK ELECTRONICS RESEARCH LABS

Personal Author(s) : Arm, M. ; Bernstein, S. ; Minkoff, J. ; Wyman, N.

Report Date : 01 JUL 1966

Pagination or Media Count : 64

Abstract : The investigation of array antenna electro-optical signal processors continues with emphasis again placed on the development of a wideband solid light modulator. Theoretical considerations are presented with regard to the effect of lead and indium bonds of non-zero thickness on the performance of both compressional and shear transducers. Parametric curves are given, for various bond thickness, to indicate the expected variations in transducer response over the pass-band as the bond thickness increases from zero to one wavelength. Initial specifications for a 300-500 MHz solid light modulator using a CdS film transducer deposited on a crystalline quartz bar are also described. Experimental studies on two interim configuration 80 MHz solid modulators are discussed and include a description of techniques that have been developed to obtain proper operation of the modulators in the optical system, and for viewing the elastic beam in the modulator's optical aperture and wedge absorber termination. Verification of the linear relationship between the modulation index and the applied voltage, for both the compressional and shear modes of operation, is presented on the basis of experimental evidence. The design and construction details of a narrow-band transducer driver are described. This driver is capable of delivering up to 200 watts of CW power at any frequency between 60 and 100 MHz.

Descriptors :   *ELECTROOPTICS), (*DATA PROCESSING, (*PHASED ARRAYS, DATA PROCESSING), MODULATORS, OPTICAL EQUIPMENT, LEAD(METAL), INDIUM, BONDING, TRANSDUCERS, THICKNESS, RESPONSE, CADMIUM COMPOUNDS, SULFIDES, ANISOTROPY, VERY HIGH FREQUENCY, REAL TIME, QUARTZ RESONATORS, ULTRASONIC RADIATION.

Subject Categories : Electrooptical and Optoelectronic Devices

Distribution Statement : APPROVED FOR PUBLIC RELEASE