Supersonic fault detection apparatus

• US 4,205,554 A
• Filed: 04/24/1978
• Issued: 06/03/1980
• Est. Priority Date: 04/26/1977
• Status: Expired due to Term

• Current Assignee: Tokyo Shibaura Denki Kabushiki Kaisha
• Original Assignee: Tokyo Shibaura Denki Kabushiki Kaisha
• Inventors: Uchida, Kuniharu, Sakurai, Yoshishige
• Primary Examiner(s): Kreitman, Stephen A.
• Application Number:
  US05/899,214
• Time in Patent Office: 771 Days
• Field of Search: 73/602, 73/618, 73/619, 73/620, 73/621, 73/625, 73/626, 73/633, 73/634, 73/901, 128/2 Y, 128/660
• US Class Current: 73/626
• CPC Class Codes: G01N 2291/02854 Length, thickness
• CPC Class Codes: G01N 2291/044 Internal reflections (echoes), e.g. on walls or defects
• CPC Class Codes: G01N 29/0609 Display arrangements, e.g. colour displays indicating or recording in connection with measuring in general G01D
• CPC Class Codes: G01N 29/0618 synchronised with scanning, e.g. in real-time
• CPC Class Codes: G01N 29/0645 Display representation or displayed parameters, e.g. A-, B- or C-Scan
• CPC Class Codes: G01N 29/11 by measuring attenuation of acoustic waves
• CPC Class Codes: G01N 29/22 Details , e.g. general constructional or apparatus details
• CPC Class Codes: G01N 29/265 by moving the sensor relative to a stationary material
• CPC Class Codes: G01N 29/4427 with stored values, e.g. threshold values
• CPC Class Codes: Y10S 73/901 Digital readout

Abstract

A probe unit including a plurality of ultrasonic fault detection probes is moved along an object to be examined by a probe drive unit. The fault detection signals produced by the probes are transfer switched among a plurality of channels of a channel selector and the output of the channel selector is sampled by a high speed sampling device. A computer is connected to the probe drive unit, channel selector and the sampling device to apply operating signals thereto and to receive the outputs thereof.

Claims

1. Supersonic fault detection apparatus comprising a plurality of probes for simultaneously transmitting and receiving a supersonic wave in different directions, probe drive means for simultaneously moving said plurality of probes over the same distance, a supersonic fault detector which transmits and receives at a predetermined interval fault detection signals produced by said plurality of probes, a channel selector for transfer switching output signals of said supersonic fault detector with a digital signal, sampling means for sampling and storing the output signal of said channel selector, and an electronic computing means adapted to compare data stored in said sampling means with a predetermined attenuation curve.

2. The supersonic fault detection apparatus according to claim 1 wherein said electronic computer is connected to supply said digital signal to said channel selector, to receive a signal from said channel selector indicating that whether said probes are maintained in intimate contact with an object to be examined or not, to receive a signal from said probe drive means representing movement and operation conditions thereof, to transmit a signal to said probe drive means for operating the same and to receive the output signal of said sampling means.

3. Supersonic fault detection apparatus comprising a probe unit including a plurality of probes for simultaneously transmitting and receiving a supersonic wave in different directions, a probe drive unit mechanically coupled to said probe unit for moving and rotating the same along an object to be examined, a drive control device for electrically controlling said probe drive unit and generating a signal representing movement and operating conditions thereof, a supersonic fault detector which receives from said plurality of probes fault detection signals at a predetermined interval, a channel selector connected to receive the output of said supersonic fault detector for transfer switching the output signals of said supersonic fault detector among a plurality of channels, sampling means for sampling and storing the output signal of said channel selector and computer connected to supply operating signals to said drive means, and to receive the outputs of said drive control device and said sampling means, said electronic computer being adapted to compare data stored in said sampling means with a predetermined attenuation curve.

4. The supersonic fault detection apparatus according to claim 3 which further comprises means responsive to the output of said channel selector for controlling the operation of said sampling means depending upon the level of said fault detection signals.

5. Supersonic fault detection apparatus comprising a probe unit including a plurality of probes for simultaneously transmitting and receiving a supersonic wave in different directions, a probe drive unit mechanically coupled to said probe unit for rotating and moving the same along an object to be examined and including means for generating a signal representing movement and operating conditions of said probe drive unit, a supersonic fault detector which receives from said plurality of probes fault detection signals at a predetermined interval, a channel selector connected to receive the output of said supersonic fault detector for transfer switching the output signals of said supersonic fault detector among a plurality of channels, sampling means for sampling and storing the output signal of said channel selector, and a computer connected to supply operating signals to said probe drive unit, said channel selector and said sampling means, and to receive the outputs of said probe drive unit and sampling means, said electronic computer being adapted to compare data stored in said sampling means with a predetermined attenuation curve.

6. Supersonic fault detection apparatus comprising a probe unit including a plurality of probes for simultaneously transmitting and receiving a supersonic wave in different directions, a probe drive unit mechanically coupled to said probe unit for moving and rotating the same along an object to be examined, a drive control device for electrically controlling said probe drive unit and generating a signal representing movement and operating conditions thereof, a supersonic fault detector which receives from said plurality of probes fault detection signals at a predetermined interval, transfer relay means connected between said probe unit and said supersonic fault detector for switching the connection of said plurality of probes, sampling means for sampling the output signal of said supersonic fault detector, and a computer connected to supply operating signals to said drive control device, said transfer relay means and said sampling device and to receive the outputs of said drive control device and said sampling device, said electronic computer being adapted to compare data stored in said sampling device with a predetermined attenuation curve.