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1. 发明专利

JPH03128456A ULTRASONIC FLAW DETECTOR 失效
公开(公告)号：JPH03128456A
公开(公告)日：1991-05-31
申请号：JP26495089
申请日：1989-10-13
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： YOSHIDA YOJI , ISAKA KATSUMI
IPC分类号： G01N29/44 , G01N29/22
摘要： PURPOSE:To release an tester from gazing at a CRT and enable the tester to devote himself or herself to scanning by a probe and measurement in a range wherein a signal is obtained by indicating variation in the amplitude of the signal in the form of stepwise variation in the pitch of an alarm tone. CONSTITUTION:A variable frequency oscillator 81, an alarm tone device 82, a voltage discriminator 83, and an alarm lamp 84 are added to the flaw detector. Then an ultrasonic wave beam 31 sent by the ultrasonic wave probe 30 is propagated in tested material 90 and reflected by a material flaw to generate a material flaw echo. This signal is received by the probe 30, amplified by a preamplifier 40 and detected by a detector 50, and displayed on a display part 61 to obtain the material flaw echo. A gate circuit 70 extracts only a part indicated by a gate mark from the echo to obtain a flaw detection signal consisting of only the material flaw echo. Then the flaw detection signal from the circuit 70 is passed through a peak holding circuit 80, the oscillator 81 is oscillated at a stepwise frequency corresponding to the output of the amplifier, and the alarm tone device 82 generates an alarm at plural levels of the flaw detection signal.

2. 发明专利

JPS61262656A ULTRASONIC FLAW DETECTION APPARATUS 失效
公开(公告)号：JPS61262656A
公开(公告)日：1986-11-20
申请号：JP10377085
申请日：1985-05-17
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： ISAKA KATSUMI
IPC分类号： G01N29/44 , G01N29/04
摘要： PURPOSE:To prevent the missing of a flaw detection by making the recording level in data recording not constant but variable, by providing an automatic variable recording level setting circuit. CONSTITUTION:The switch 26 of an automatic variable recording level setting circuit is preliminarily turned to an A-side prior to flaw detection and an object 10 to be inspected is manually or automatically scanned by a probe 11. Noise generated at random enters into a peak echo selecting circuit 4 via a beam path length selection circuit 12, a beam path length setting circuit 25 and an echo memory circuit 13 and the max. echo height and the beam path at that time are stored in a recording level memory circuit 20. When actual flaw detection is performed, the switch 26 is turned to a B-side and data is directly inputted to a flaw detection data operation circuit 21. At this time, an echo appears in a certain beam path length and, when echo is higher than the height of the echo operated according to a predetermined formula by the flaw detection data operation circuit 21, said echo is recorded to a data-recording circuit 23.

3. 发明专利

JPS61167860A AUTOMATIC ULTRASONIC FLAW DETECTING METHOD 失效
公开(公告)号：JPS61167860A
公开(公告)日：1986-07-29
申请号：JP670485
申请日：1985-01-19
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： KOGURE SUMIO , TAYAMA KENJI , ISAKA KATSUMI , HANAWA HARUYUKI
IPC分类号： G01N29/26 , G01N29/04 , G01N29/265
摘要： PURPOSE:To detect a defect part in detail without taking a long time for flaw detection by performing flaw detection normally at large subscanning pitch and decreasing the subscanning pitch for a part where a defect is detected. CONSTITUTION:An ultrasonic probe 16 is scanning automatically on the surface of an object body 12 in two dimensions. In this flaw detecting means, when a defect 14 is detected for the 1st time while the probe 16 is scanned along a scanning course 15, the probe 16 is returned to the subscanning position which is one-pitch before and scanning is made again while the subscanning pitch is decreased from the position. When the defect 14 is not detected any more, scanning is made at the original subscanning pitch. Consequently, the scanning is made as shown by a scanning course 18, the time required for the flaw detection is shortened, and the flaw detection is performed in detail for the defect part.

4. 发明专利

JPH03105245A REMOTE FIELD TYPE PROBE FOR EDDY CURRENT FLAW DETECTION 失效
公开(公告)号：JPH03105245A
公开(公告)日：1991-05-02
申请号：JP24225889
申请日：1989-09-20
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： ISAKA KATSUMI , SHIRAISHI MITSUAKI , YOSHIDA YOJI
IPC分类号： G01B7/34 , G01B7/00 , G01N27/87 , G01N27/90
摘要： PURPOSE:To achieve higher detectability of a defect approached by arranging a receiver coil on both sides of a transmitter coil to reduce a flaw detection impossible range at a tube end. CONSTITUTION:It is assumed that a remote field type probe for eddy current flaw detection is shifted to the right from the left in direction of feeding. A transmitter coil 1 enters a tube 7 and a DC magnetic field 3 works within a tube so that an eddy current 6 and an induction magnetic field 4 generated thereby become stable for the first time. As a result, if with a receiver coil 2 only, a flaw detection impossible range 11 will be generated from a tube end 8 to the receiver coil 2. At this point, a receiver coil 5 which is disposed on the opposite side of the receiver coil 2 sandwitching the transmitter coil 1 is not yet to enter the tube. Furthermore, when the probe is fed to the right and the receiver coil 5 enters the tube 7, the transmitter coil 1 already generates a fixed eddy current to make ready for detection from the tube end 8. This also achieves higher detectability of a defect approached.

5. 发明专利

JP2000028588A ULTRASONIC FLAW DETECTING METHOD 失效
公开(公告)号：JP2000028588A
公开(公告)日：2000-01-28
申请号：JP19192298
申请日：1998-07-07
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： ISAKA KATSUMI , MIURA SHIRO , NEMEZAWA ISAO
IPC分类号： G01N29/04
摘要： PROBLEM TO BE SOLVED: To easily detect material flaws for a complicated shape of a testing body, for which angle beam flaw detection and surface wave flaw detection are difficult to be applied in a normal method, in particular the material flaw generated in a cylindrical face. SOLUTION: In this ultrasonic flaw detecting method, in which a flaw detection signal is output to a submerged probe 1 from an ultrasonic flaw detector 40, and in which an ultrasonic wave is made incident into a flaw-detected object existing in water via the water to detect a flaw, the ultrasonic wave is emitted making the probe 1 made to face to an inflection point 3, where the variations of a surface shape of a material comes to a prescribed amount or more discontinuously so as to get incident into a testing body 8, ultrasonic waves of plural vibration modes generated simultaneously in an incident point of the ultrasonic wave are propagated inside the testing body 8, and echoes reflected in a propagation process therein are detected to conduct flaw detection for a surface of a curved surface part 8a.

6. 发明专利

JPS6086459A AUTOMATIC/SEMI-AUTOMATIC FLAW DETECTING DEVICE USING ULTRASONIC WAVES 失效
公开(公告)号：JPS6086459A
公开(公告)日：1985-05-16
申请号：JP19412383
申请日：1983-10-19
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： ISAKA KATSUMI , KOGURE SUMIO
IPC分类号： G01N29/06 , G01N29/11 , G01N29/30 , G01N29/44 , G01N29/48
摘要： PURPOSE:To erase noise such as grass echo automatically at the data processing by providing a data recording device with a processing level selecting circuit. CONSTITUTION:A no defective part in a sensitivity adjusting contrast testing chip 1 or a body 2 to be tested is scanned by a probe 3 to check the generation of the grass echo on a CRT. A detecting signal from the probe 3 is inputted to an arithmetic circuit 5 in a data recording part and the number (n) of peaks of the grass echo 10 is counted. A discrimination circuit 6 discriminates whether the (n) is more than a regulated value n' or not, if n n', the data is inputted to the processing level selecting circuit 7 and respective height of the grass echo 10 is read out to find out the maximum echo height. Twice the maximum echo height is selected as a processing level and stored in the storage circuit 8. Data having storage level 11 or more is stored in a storage circuit 8. Thus, the data more than the processing level is automatically processed and the noise such as the grass echo is automatically erased.

7. 发明专利

JPH03140861A REMOTE FIELD TYPE PROBE FOR EDDY-CURRENT FLAW DETECTION 失效
公开(公告)号：JPH03140861A
公开(公告)日：1991-06-14
申请号：JP27842589
申请日：1989-10-27
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： ISAKA KATSUMI , SHIRAISHI YASUAKI , KOGURE SUMIO
IPC分类号： G01N27/90
摘要： PURPOSE:To improve a defect detecting property of a probe for flaw detection, a testing speed and S/N by adopting coaxial cables for a flaw detection cable. CONSTITUTION:A flaw detection cable 7 is constructed of two sets of coaxial cables 8 and 9, and an inner conductor 3 of the coaxial cable 8 is connected to the beginning end of a copper wire 2 wound on a transmitter coil 1. The terminal end of the copper wire 2 is connected to an outer conductor 4 of the coaxial cable 8. The inner conductor 3 and the outer conductor 4 of the coaxial cable 9 are connected likewise to the beginning and terminal ends of a copper wire 6 wound on a receiver coil 5, respectively. In the flaw detection cable 7, the coaxial cables 8 and 9 are protected by using a heat-shrinkable tubing 10 and, besides, a wire 11 is employed in the center of the flaw detection cable 7 so as to give some strength to the flaw detection cable 7. When flaw detection of a heat exchanger tube is executed by using this flaw detection cable 7 with a test frequency 1 kHz and a cable length 30 m, a defect waveform of phi 1.0 to phi 3.0 (a through hole) can be detected distinctly. According to this constitution, it is possible to improve a defect detecting property of a probe, a testing speed and S/N.

8. 发明专利

JPH01254857A EDDY CURRENT FLAW DETECTOR 失效
公开(公告)号：JPH01254857A
公开(公告)日：1989-10-11
申请号：JP8359788
申请日：1988-04-05
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： ISAKA KATSUMI , KOGURE SUMIO , YOSHIDA YOJI , SONODA SHINJI , TSUDA KATSU
IPC分类号： G01N27/90
摘要： PURPOSE:To make the testing frequency having the highest flaw detecting sensitivity automatically selectable even if the numbers of turns of testing coils change in a remote field eddy current flow detecting method by providing an automatic tuner which automatically finds the resonance frequency of the coils. CONSTITUTION:A testing coil for remote field flow detection is composed of a transmitter coil 1 and receiver coil 2 and the eddy current 14 produced by the direct magnetic field 13 of the coil 1 flows far through a conductor 17 and reaches an area where no influence is received from the direct magnetic field 13, namely, a remote field area 15. By providing the coil 2 in the area 15, an induced magnetic field 16 produced by the eddy current 14 is detected by the coil 2. If a flaw 12 exists, the eddy current 14 and induced magnetic field 16 are changed. By detecting the variations, the flaw 12 can be detected. An automatic tuner 8 is provided for finding the resonance frequency of the coil constitutions in such a way that an oscillator 3 is allowed to select plural frequencies and the magnitude of the output signal of an amplifier 4 corresponding to each respective frequency is decided.

9. 发明专利

JPS63198865A AUTOMATIC ULTRASONIC FLAW DETECTOR 失效
公开(公告)号：JPS63198865A
公开(公告)日：1988-08-17
申请号：JP2949787
申请日：1987-02-13
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： MIZUTANI TOMOYUKI , ARAI KATSUMI , YOSHIDA YOJI , ISAKA KATSUMI
IPC分类号： G01N29/30 , G01N29/04 , G01N29/28
摘要： PURPOSE:To accurately perform the flaw detection of a test material which is so structured that no bottom surface echo is obtained by correcting variation in flaw detection sensitivity according to variation in the state of a contacting medium between a test surface and the test material. CONSTITUTION:A delay time measuring instrument 42 generates a pulse with length proportional to the leading time delay DELTAt of a border echo based upon variation in the thickness, i.e. size 61 of the contacting medium 60 and sends the pulse to a time signal generator 43. A sampling pulse is inputted to a control terminal at the end of the input pulse and then a voltage proportional to the length of the input pulse, i.e. delay time is obtained. An automatic sensitivity adjusting device 45 can adjust an amplification rate optionally with the level of a control voltage. An ultrasonic flaw detection signal is inputted to an input terminal from a receiver and the output of a delay time signal generator is applied to the control terminal to correct variation in sensitivity with the thickness of the contacting medium.

10. 发明专利

JPS58223748A Trackless probe device 失效
标题翻译：无轨探头设备
公开(公告)号：JPS58223748A
公开(公告)日：1983-12-26
申请号：JP10680982
申请日：1982-06-23
申请人： Hitachi Eng Co Ltd , Hitachi Ltd
发明人： KOGURE SUMIO , ISAKA KATSUMI
IPC分类号： G01N27/82 , G01N29/26 , G01N29/265
CPC分类号： G01N29/265
摘要： PURPOSE:To perform wide-range flaw detection and to simplify a probe device, by substituting the wheels of the probe device with magnet wheels, finding the coordinates of the position of the probe from their numbers of revolutions, and eliminating the need for a track. CONSTITUTION:The probe device 4 is supported by the wheels 2 made of magnets and the probe 1 is moved in a direction Y to transmit the numbers of revolutions of said wheels 2 to a coordinate detector 3. Consequently, the X-axis coordinate of the coordinates (X, Y) of the probe position is found. Further, the device is moved in a direction Y with a handle 5 and the number of revolutions of a feed screw 6 is transmitted to the coordinate detector 3. Thus, the Y-axis coordinate is found. This constitution allows wide-range flaw detection because a conventional track is not used and simplifies the device.
摘要翻译：目的：为了进行大范围的探伤和简化探针装置，通过用磁轮代替探头装置的轮子，从探头的转数中找出探针位置的坐标，并消除对轨道的需要。构成：探针装置4由磁铁制成的车轮2支撑，探针1沿Y方向移动，将车轮2的转数发送到坐标检测器3.因此，X轴坐标找到探头位置的坐标（X，Y）。此外，装置通过手柄5沿Y方向移动，并且进给螺杆6的转数传递到坐标检测器3.因此，找到Y轴坐标。这种构造允许广泛的探伤，因为不使用传统的轨道并且简化了装置。

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