Adjustable radius apparatus for calibrating ultrasonic transducer array.

摘要

Calibration apparatus (10) for an ultrasonic transducer array (85) which is used to inspect inaccessible concave surfaces in a hazardous environment such as inside a nuclear steam generator; the transducer array (85) is calibrated by moving it along an arcuate calibration test member (11) and includes four upright posts (23) interconnected by a rectangular carriage (30) which is slidably movable vertically along the posts (23) and which has a horizontal pivot shaft (36). An attachment rod (56) dependent from the shaft (36) through a mounting block (51) carries a coupling joint at its lower end for mounting the transducer array (85). A reversible gearmotor (42) drives the pivot shaft (36) in an oscillating motion. Backlash in the gear train is reduced by a bias weight (102).