摘要:
[Object] To simply and accurately determine the position of an edge, the depth or the height of a flaw including a surface crack, a corroded portion near the surface layer of a thick specimen, and a minute damage.[Solving Means] An ultrasonic flaw detection method causes an ultrasonic wave 16 to be incident on a specimen 6 from an oblique direction, detects a diffracted wave 17 generated at an edge of a flaw 20 in the specimen 6 above the flaw, and determines the position of the edge of the flaw 20 from a front surface 13 of the specimen 6 using a triangular method from an entire beam path Wt of a component 18, which directly propagates above the flaw 20, of the diffracted wave, the entire beam path passing through the flaw from the position of incidence of the component 18, and an interval S between the position of incidence and the position of detection of the ultrasonic wave or from the difference (tt−ts) between the propagation time of a surface wave 15, to which the above relations reflect, to reception and the propagation time of the diffracted wave 18, which directly propagates above the flaw, to reception.
摘要:
The measurement of a flaw height in a thick welded portion of a stainless steel specimen, which is difficult to perform by the TOFD method, can be conducted with more ease, with higher accuracy and in a shorter time than in the case of using tip echo techniques. In addition, it is possible to reduce variations in measurement results among individual inspectors.An ultrasonic wave 21 is launched by a transmitting probe 1 into a specimen 20 in a direction oblique to a flaw 24 to generate diffracted waves at the tip 25 of the flaw 24, then a diffracted wave 22 propagating upward directly from the flaw 24 and a diffracted wave 23 propagating upwardly of the flaw 24 after once reflected off the back 27 are received by a receiving probe 2 disposed above the flaw 24, and the height of the tip of the flaw 24 from the back 27 is measured from the propagation time difference between the received diffracted waves.
摘要:
A plurality of ultrasonic flaw detection methods can be switched and executed by a simple operation. An ultrasonic flaw detection apparatus includes a switching circuit 3 for permitting an angle probe 1 and a normal probe 2 to be arbitrarily switched to a transmission unit T and a reception unit R of a flaw detector. The switching circuit 3 can select an angle flaw detection mode for transmitting and receiving an ultrasonic beam only by the angle probe, an SPOD mode for transmitting the ultrasonic beam by the angle probe and receiving a diffracted wave by the normal probe and a flaw detection mode executed by a combination of angle flaw detection mode.
摘要:
To simply and accurately determine the position of an edge, the depth or the height of a flaw including a surface crack, a corroded portion near the surface layer of a thick specimen, and a minute damage.An ultrasonic flaw detection method causes an ultrasonic wave 16 to be incident on a specimen 6 from an oblique direction, detects a diffracted wave 17 generated at an edge of a flaw 20 in the specimen 6 above the flaw, and determines the position of the edge of the flaw 20 from a front surface 13 of the specimen 6 using a triangular method from an entire beam path Wt of a component 18, which directly propagates above the flaw 20, of the diffracted wave, the entire beam path passing through the flaw from the position of incidence of the component 18, and an interval S between the position of incidence and the position of detection of the ultrasonic wave or from the difference (tt−ts) between the propagation time of a surface wave 15, to which the above relations reflect, to reception and the propagation time of the diffracted wave 18, which directly propagates above the flaw, to reception.
摘要:
A non-destructive inspection scanning apparatus and a non-destructive inspection apparatus which can cope with the size and shape of a structure, which is an inspection target, in which attachment to the structure is facilitated, and which can be reduced in size and cost are provided. A non-destructive inspection scanning apparatus (2) that relatively moves a sensor head (3) employed to detect a flaw in an inspection target (P) with respect to a test surface of the inspection target (P) includes a rod-shaped guide portion (27) that is disposed at the inspection target (P) and that extends along a surface of the inspection target (P); a pair of wheels (23) having a ring-like groove portion (23F), which sandwiches the guide portion (27) therein, at a circumferential surface that comes in contact with the inspection target (P); a suctioning portion (23) that generates a suction force that presses the wheels (23) against the inspection target (P); and a casing (21) that holds the sensor head (3) and to which the pair of wheels (23) are attached so as to be rotatable about a rotation axis that extends in a direction that intersects a surface of the inspection target (P) to which the wheels (23) come in contact.
摘要:
A plurality of ultrasonic flaw detection methods can be switched and executed by a simple operation.An ultrasonic flaw detection apparatus includes a switching circuit 3 for permitting an angle probe 1 and a normal probe 2 to be arbitrarily switched to a transmission unit T and a reception unit R of a flaw detector. The switching circuit 3 can select an angle flaw detection mode for transmitting and receiving an ultrasonic beam only by the angle probe, an SPOD mode for transmitting the ultrasonic beam by the angle probe and receiving a diffracted wave by the normal probe, a flaw detection mode executed by a combination of angle flaw detection mode the SPOD method for transmitting the ultrasonic beam by the angle probe and receiving a reflected wave by the angle probe as well as receiving the diffracted wave by the normal probe, and a normal flaw detection mode for transmitting and receiving the ultrasonic beam by the normal probe.
摘要:
The measurement of a flaw height in a thick welded portion of a stainless steel specimen, which is difficult to perform by the TOFD method, can be conducted with more ease, with higher accuracy and in a shorter time than in the case of using tip echo techniques. In addition, it is possible to reduce variations in measurement results among individual inspectors.An ultrasonic wave 21 is launched by a transmitting probe 1 into a specimen 20 in a direction oblique to a flaw 24 to generate diffracted waves at the tip 25 of the flaw 24, then a diffracted wave 22 propagating upward directly from the flaw 24 and a diffracted wave 23 propagating upwardly of the flaw 24 after once reflected off the back 27 are received by a receiving probe 2 disposed above the flaw 24, and the height of the tip of the flaw 24 from the back 27 is measured from the propagation time difference between the received diffracted waves.
摘要:
A pressure sensor and a pressure measuring device are provided applicable to a variety of pressure detection targets and capable of measuring a surface pressure. The pressure sensor is configured by laminating a metal layer made of a metal film, an elastic member layer made of a non-metal material, and a coil layer including an exciting coil. Also, as for a sensor sheet on which sensors that each measure point pressure are arranged in an array, variable elements of the elastic member layer and the coil layer are appropriately changed, thereby forming sensors with a single sheet that are different in pressure detection accuracy or pressure detection range for predetermined areas. Also provided is a pressure measuring device that controls exciting timing or frequency of applied voltage of each exciting coil on a sensor sheet.
摘要:
A pressure sensor and a pressure measuring device are provided applicable to a variety of pressure detection targets and capable of measuring a surface pressure. The pressure sensor is configured by laminating a metal layer made of a metal film, an elastic member layer made of a non-metal material, and a coil layer including an exciting coil. Also, as for a sensor sheet on which sensors that each measure point pressure are arranged in an array, variable elements of the elastic member layer and the coil layer are appropriately changed, thereby forming sensors with a single sheet that are different in pressure detection accuracy or pressure detection range for predetermined areas. Also provided is a pressure measuring device that controls exciting timing or frequency of applied voltage of each exciting coil on a sensor sheet.