Ultrasonic detector and method for ultrasonic detection

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, said one of said plurality of ultrasonic waves being formed by applying a step function voltage to an oscillator;
• 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 ((n±(½)×(106×v/ΔL)(Hz), where ΔL 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.

A method for detecting an ultrasonic wave, comprising the steps of:

• transmitting a plurality of ultrasonic waves with a transmitting transducer;
• receiving said plurality of ultrasonic waves with a receiving transducer;
• moving said transmitting transducer and said receiving transducer within a predetermined region on a surface of a material being detected;
• performing arithmetic averaging every time on a received ultrasonic wave and on a plurality of previously received ultrasonic waves so as to produce a set of averaged ultrasonic waves;
• and
• extracting an extracted ultrasonic wave having a predetermined frequency as a center frequency from said set of averaged ultrasonic waves,
• wherein said predetermined frequency is given by ((n±(½)×(106×v/ΔL)(Hz), where ΔL 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.

A method for detecting an ultrasonic wave comprising the steps of:

• transmitting a plurality of ultrasonic waves with a transmitting transducer;
• receiving said plurality of ultrasonic waves with a receiving transducer, said receiving transducer is moved within a predetermined region on a surface of a material being detected;
• performing arithmetic averaging every time on a received ultrasonic wave and on a plurality of previously received ultrasonic waves so as to produce a set of averaged ultrasonic waves;
• and
• extracting an ultrasonic wave having a predetermined frequency as a center frequency from said set of averaged ultrasonic waves,
• wherein said predetermined frequency is given by ((n±(½))×(10 6×v/ΔL)(Hz), where ΔL 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.

A method for detecting an ultrasonic wave comprising the steps of:

• repeating a predetermined number of times the steps of:
• transmitting a plurality of ultrasonic waves with a plurality of times a transmitting transducer;
• receiving said plurality of ultrasonic waves with a receiving transducer, said receiving transducer within a predetermined region on a surface of a material being detected;
• performing arithmetic averaging every time on a received ultrasonic wave and on a plurality of previously received ultrasonic waves so as to produce a set of averaged ultrasonic waves;
• varying a distance between said transmitting transducer and said receiving transducer by a predetermined amount;
• determining an arithmetic mean of ultrasonic waves obtained as results of said arithmetic averaging;
• and
• extracting an ultrasonic wave having a predetermined frequency as a center frequency from said set of averaged ultrasonic waves,
• wherein said predetermined frequency is given by ((n±(½))×(10 6×v/ΔL))(Hz), where ΔL 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.

A method for detecting an ultrasonic wave comprising the steps of iteratively:

• transmitting a plurality of ultrasonic waves with a transmitting transducer;
• receiving said plurality of ultrasonic waves with a receiving transducer, said receiving transducer within a predetermined region on a surface of a material being detected;
• performing arithmetic averaging every time on a received ultrasonic wave and on a plurality of previously received ultrasonic waves so as to produce a set of averaged ultrasonic waves;
• extracting an ultrasonic wave having a predetermined frequency as a center frequency from said set of averaged ultrasonic waves;
• and
• moving said transmitting transducer and said receiving transducer on a surface of a material being detected,
• wherein said predetermined frequency is given by ((n±(½))×)106×v/ΔL))(Hz), where ΔL 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.