Accession Number : AD0693884

Title :   ELECTRONIC EQUIPMENT AND IMAGE CONVERTER WITH ENLARGED IMAGE FIELD FOR VISUALIZATION OF FAULTS IN MATERIALS.

Descriptive Note : Final technical rept. Jul 68-Jun 69,

Corporate Author : TECHNISCHE HOCHSCHULE AACHEN (WEST GERMANY) LABORATORIUM FUER ULTRASCHALL

Personal Author(s) : Pohlman,R. ; Schatzer,E. ; Licht,H.

Report Date : JUN 1969

Pagination or Media Count : 49

Abstract : The first part of the report describes an electronic device which enables the application of the pulse-reflex method for the ultrasound image-converting technique. According to the short duration of the sound pulses and a limited scanning velocity the transducer must be scanned with partial lines. By use of a non-linear amplifier the large dynamic range of the vidio signal, caused by mirror effects, is compressed and adapted to the dynamic range of the television screen. The fully transistorized apparatus contains the circuits for the power supplies and the controls of the converter tube, the picture tube, the signal processing device and the transmitter triggering circuit. The second part of the report describes the construction and the development of an image converter tube which, in contrast to tubes formerly built, uses a shell transducer. Its sound frequency is 5 MHz, the diameter of the transducer is 50 mm. Formulas were given about the influence of the geometry of the shell on the mechanical stability and the sound-optical properties. The method for plating the tube front with a gold layer for vacuum tightness is described. Finally, there is a discussion of sound images made by the electronic device in shadowgraph method and pulse-reflex technique. (Author)

Descriptors :   (*NONDESTRUCTIVE TESTING, IMAGE CONVERTERS), (*IMAGE CONVERTERS, ACOUSTIC SIGNALS), ULTRASONIC RADIATION, DEFECTS(MATERIALS), IMAGES, DISPLAY SYSTEMS, WEST GERMANY

Subject Categories : Electrical and Electronic Equipment
      Mfg & Industrial Eng & Control of Product Sys

Distribution Statement : APPROVED FOR PUBLIC RELEASE