Patent ID: 6584847
Filing Date: 2003-07-01
Classification: G01B,G01N,G01V

Abstract:
An ultrasonic detection apparatus, including a receiving transducer configured to receive a plurality of ultrasonic waves transmitted by a transmitting transducer, comprising:an arithmetic averaging device configured to perform an arithmetic averaging process a plurality of times per one detection, each of said plurality of times performed in response to one of said plurality of ultrasonic waves being received by said receiving-transducer, said arithmetic averaging process includes averaging said one of said plurality of ultrasonic waves and at least one prior received ultrasonic wave of the plurality of ultrasonic waves so as to produce a set of averaged ultrasonic waves; and an extractor configured to extract an extracted ultrasonic wave from said set of averaged ultrasonic waves, said extracted ultrasonic wave having a predetermined frequency as a center frequency, wherein said predetermined frequency is given by ((nÂ±(Â½)Ã—(106Ã—v/&Dgr;L)(Hz), where &Dgr;L is a variation in a distance between said transmitting transducer and said receiving transducer, v is an ultrasonic wave transmission velocity of a material being detected, and n is a natural number.