DEVELOPMENT OF A NEW DISPLACEMENT-MEASURING ULTRASONIC SENSOR-BASED ON ASTIGMATIC FOCUS ERROR DETECTION-MEASURING PRINCIPLE AND ITS DEMONSTRATION

Conventional ultrasonic displacement-measuring systems normally employ the pulse-echo technique. Resultant resolution capability, however, t ypically is not suitable for meeting high-dimensional, in-process meas urement standards used in cutting and grinding operations. This paper presents a new ultrasonic sensor for displacement measurement based on astigmatic focus error detection. The measuring principle and basic a nalysis applied in the design method are described in detail, after wh ich the validity of the principle is demonstrated by the results of ex perimental evaluations. (C) Elsevier Science Inc., 1997.