Accession Number : ADB082444

Title :   Improved Ultrasonic Scanner. Part 1. System Manufacture.

Descriptive Note : Final rept. 1 Jan-30 Sep 78,

Corporate Author : SYSTEMS RESEARCH LABS INC DAYTON OH

Personal Author(s) : Raney,J. M. ; Taylor,F. M. ; Weinhold,J. H.

Report Date : OCT 1983

Pagination or Media Count : 86

Abstract : The overall objective of this program was to produce two prototype units designated as Autoscan I and Autoscan II, and four production Autoscan I's for use during the C-5A Structural Information Enhancement program (SIEP). The overall objective was met. The success of Autoscan I has resulted from the incorporation of many features not found in earlier devices including focused transducers; improved boot design; eddy-current centering; direct-reading mechanical adjustments; a large, refreshed-CRT display; stored data with automatic or manual plotting; scan interlocks; and a convenient support device. These and other innovations resulted in a rugged, field-usable system which is capable of reliably detecting radial fatigue flaws as small as 0.030 in. in the material surrounding installed fasteners. Initial evaluation of Autoscan I on samples containing induced fatigue cracks indicates a 95% probability of detection of a 0.030 in. or larger fatigue crack with a 95% confidence level. When the instrument is used in the manner set forth by SRL, the false-call rate is virtually zero. The intrinsic sensitivity of the instrument allows detection of fatigue cracks considerably smaller than 0.030 in.

Descriptors :   *ULTRASONIC TESTS, *SCANNERS, *CRACKS, ACOUSTIC DETECTORS, ULTRASONIC FREQUENCIES, FOCUSING, FASTENINGS, WINGS, JET TRANSPORT AIRCRAFT, STRUCTURAL PROPERTIES, DEFECTS(MATERIALS), FATIGUE(MECHANICS), ACOUSTIC SIGNALS, SIGNAL PROCESSING, HOLES(OPENINGS), ELECTROACOUSTIC TRANSDUCERS, ACOUSTIC WAVES, EDDY CURRENTS, MICROCOMPUTERS, INSPECTION, TEST EQUIPMENT, NONDESTRUCTIVE TESTING, SENSITIVITY, PROTOTYPES, MANUFACTURING

Subject Categories : Transport Aircraft
      Electrical and Electronic Equipment
      Couplers, Fasteners, and Joints
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE