초록 ▼

An ultrasonic inspection apparatus for inspecting a test piece includes an ultrasonic transducer for transmitting test signals into the test piece, for receiving associated response signals reflected back thereto, and for generating a defect signal when a response signal indicates an abnormal condit

An ultrasonic inspection apparatus for inspecting a test piece includes an ultrasonic transducer for transmitting test signals into the test piece, for receiving associated response signals reflected back thereto, and for generating a defect signal when a response signal indicates an abnormal condition in the test piece. A control signal generator generates a control signal at predetermined intervals of distance of movement of the transducer relative to the test piece while the transducer generates test signals at a frequency independent the control signal frequency. A principal counter counts the control signals and generates an alarm signal when its count exceeds a value indicating that sufficient defect signals have been generated during movement of the transducer over a predetermined distance to confirm the presence of an unacceptable abnormal condition. A reset counter is connected to the control signal generator for also counting the control signals, is connected to the transducer for receiving defect signals therefrom, and is connected to the principal counter for generating a reset signal therefor. The reset counter is reset by each of the defect signals and generates one reset signal when its count exceeds a predetermined amount indicative of the maximum distance of movement of the transducer during which a defect signal may not be generated from an unacceptable abnormal condition.

대표청구항 ▼

In an apparatus for inspecting a test piece and indicating an unacceptable condition therein, including means for transmitting a test signal into said test piece, for receiving an associated response signal reflected back thereto, and for generating a defect signal when the character of said respons

In an apparatus for inspecting a test piece and indicating an unacceptable condition therein, including means for transmitting a test signal into said test piece, for receiving an associated response signal reflected back thereto, and for generating a defect signal when the character of said response signal indicates an unexpected condition in said test piece; means for moving said transmitting-receiving means relative to said test piece; means for generating a control signal at each of a plurality of predetermined intervals of distance of said movement of said transmitting-receiving means; means for pulsing said transmitting-receiving means to sequentially generate test signals at a frequency independent of generation of said control signals; and principal counter means for counting said control signals in response to generation of defect signals and being reset to an initial value in response to the absence of defect signals, said principal counter means further producing an alarm signal when it accumulates a count of said control signals that exceeds a predetermined amount in response to generation of sufficient defect signals during said movement of said transmitting-receiving means over a predetermined distance to confirm the presence of an abnormal condition that is unacceptable; the improvement comprising: resetting means for resetting said principal counter means only in the absence of generation of defect signals during movement of said transmitting-receiving means over a distance at least equal to the maximum distance during which a defect signal may not be generated from an unacceptable abnormal condition.