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1. 发明专利

JPS61296265A APPARATUS FOR DISCRIMINATING SOUND SOURCE 失效
公开(公告)号：JPS61296265A
公开(公告)日：1986-12-27
申请号：JP13876485
申请日：1985-06-25
申请人： NF KAIRO SEKKEI BLOCK KK
发明人： HARADA SHUICHI
IPC分类号： G01H3/04 , G01H3/08 , G01H17/00 , G01N29/04 , G01N29/14
摘要： PURPOSE:To attain to enhance discrimination accuracy by discriminating a sound source, by preliminarily registering the frequency pattern of the signal from the sound source and matching this pattern with the frequency pattern from the sound source. CONSTITUTION:The AE signal detected through a transducer 1 receives impedance transformation by a preamplifier to be inputted to band-pass filters BPF51-55 to different frequency pass band through a coaxial cable 3 and a buffer amplifier 4. The AE signal divided into five frequency bands is inputted to a multiplexer 9 through logarithmic amplifiers 61-65 and detectors 71-75. The outputs thereof are inputted to a microcomputer 11 as frequency patterns of signal levels corresponding to five bands at certain time and the distance data between two points of the signal levels of said frequency patterns is calculated. This distance data of the frequency patterns is compared with that corresponding to the preliminarily registered frequency pattern of the signal from a sound source to enable the highly accurate discrimination of the sound source.

2. 发明专利

JPS61251776A MEASURING INSTRUMENT FOR EARTH RESISTANCE 失效
公开(公告)号：JPS61251776A
公开(公告)日：1986-11-08
申请号：JP9441985
申请日：1985-04-30
申请人： NF KAIRO SEKKEI BLOCK KK , CHUBU ELECTRIC POWER
发明人： TOMURA HIROMICHI , YAMASHITA NAOTA , KAWAKAMI HIDEO , SATO AKIO , KATAYAMA OSAMU , HIRANE HIROMICHI
IPC分类号： G01R27/20
摘要： PURPOSE:To detect real earth resistance by subtracting the current of an earth system which is connected to an earth system to be detected from a current flowing through the latter system. CONSTITUTION:Earth networks 121 and 122 of other electric stations are connected to an earth network 7 through aerial earth wires. A current transformer 13 is connected between a constant current amplifier 5 and the earth network 7 to detect a current I flowing through the earth network 7 and current transformers 141 and 142 are connected between the earth network 7 and other earth networks 121 and 122 to detect currents I1 and I2 flowing through the earth networks 121 and 122. An adder 15 is connected to output terminals of the current transformers 13, 141, and 142 and the currents I1 and I2 flowing to other earth systems are subtracted from the current I flowing to the earth system to be measured, thus obtaining a current I0. The current I0 is the earth current of this electric station and the current voltage V is measured by a voltage measuring part 8 to measure only the earth resistance of this electric station with high precision.

3. 发明专利

JPS6279347A DETECTION OF HIDDEN CONDUCTOR 失效
公开(公告)号：JPS6279347A
公开(公告)日：1987-04-11
申请号：JP21987085
申请日：1985-10-02
申请人： OSAKA GAS CO LTD , NF KAIRO SEKKEI BLOCK KK
发明人： NANAMI YUKIHIRO , KAMIIDE KOICHIRO , NORO TOSHIKI
IPC分类号： G01V3/10 , G01N27/83 , G01V3/11
摘要： PURPOSE:To detect a hidden conductor of the like accurately, by propagating a square wave outputted from a first oscillation circuit between an underground buried steel pipe and the ground to detect and display it with a portable detector containing a second oscillation circuit with the oscillation frequency and phase equal to those of the first oscillation circuit. CONSTITUTION:One output terminal of an oscillation circuit 4 is electrically connected to a steel pipe 1 through a line 5 while the other output terminal is grounded 2 with an electrode 6. A square wave oscillation signal outputted from the circuit 4 is detected with a detection coil 9 of a detector 8 carried by a worker. An output of the coil 9 is amplified 10 and introduced to multiplication circuits 14 and 22 of synchronous detection circuits 13 and 21. On the other hand, an oscillation circuit 11 in the unit 8 has an oscillation frequency and phase equal to those of the circuit 4 and an output thereof is shifted 20 by 90 deg. to be applied to the circuit 22. Output signals of the circuits 13 and 21 are inputted into a computing circuit 19 as X and Y axis components respectively in an X-Y coordinate system and displayed on a display circuit 27. Thus, a worker can detect damage to a coating layer of an underground buried steel pipe and a hidden conductor accurately.

4. 发明专利

JPS61215593A SOUND SOURCE SIGNAL GENERATION 失效
公开(公告)号：JPS61215593A
公开(公告)日：1986-09-25
申请号：JP5744985
申请日：1985-03-20
申请人： NF KAIRO SEKKEI BLOCK KK
发明人： IMAI SEI , FURUICHI CHIEKO
IPC分类号： G10H5/00 , G10H7/08 , G10H7/10

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