EP0024707A2
Expired / Lapsed
EP
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Electromagnetic ultrasonic apparatus
Assignee: Hitachi Ltd
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Filing: 1980-08-22
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Granted: —
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Expires: 2000-08-22
Abstract
Abstract First and second magnetic poles (10,12) are provided, which have end surfaces (16,18) brought close and in opposition to a material (14) to be examined. These magnetic poles (10,12) are magnetized by DC exciter coils (88,90) such thatthe magnetic poles (10,12) have opposite polarities. The first magnetic ple (10) is provided at its end surface (16) with a pair of cumulatively connected transmitting coils, and the second magnetic pole (12) is provided at its end surface (18) with a pair of differentially connected receiving coils. The transmitting coils are connected to a pulser which generates a pulse current, and the receiving coils are connected to a differential amplifier. An electromagnetic ultrasonic wave generated by the transmitting coils are received by teh receiving coils, amplified by the differential amplifier, and thereafter supplied to a synchroscope and an automatic detector.
Inventors
- 👤 Ichiya Sato
- 👤 Kazuo Miyagawa
- 👤 Yukihito Sasaki
- 👤 Kohji Kawamura
- 👤 Shuichi Sato
- 👤 Sohji Sasaki
- 👤 Jun Kubota
- 👤 Susumu Ito
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 18:52
CPC Classifications
G; G01; G01N; G01N29/00; G01N29/22; G01N29/24; G01N29/2412; G10; G10K; G10K15/00; G10K15/04; G01N2291/00; G01N2291/02; G01N2291/028; G01N2291/02854; G01N2291/04; G01N2291/042; G01N2291/0421
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
243 words
An electromagnetic ultrasonic apparatus for examining materials by using ultrasonic waves, characterized by a first magnetic pole (10) having an end surface (16) which is brought close and in opposition to a material (14) to be examined; a second magnetic pole (12) having an end surface (18) which is brought close and in opposition to the material (14), and a polarity opposite to that of said first magnetic pole (10); a DC magnetic field generating means (76,78) for supplying a DC magnetic field to said first and second magnetic poles(10,12); a pair of transmitting coils (36,37) which are provided between the material (14) and the end surface (16) of said first magnetic pole (10) and which face different portions of a surface of the material (14); a pair of receiving coils (38,39) which are provided in either a space between the material (14) and the end surface (16) of said first magnetic pole (10) or space between the material (14) and the end surface (18) of said second magnetic pole (12) and which are opposed to said transmitting coils (36,37), respectively; a pulse signal generating means (98) for supplying a pulse current to said transmitting coils (36,37); and a signal control means (114) for amplifying and controlling output signals generated in said receiving coils (38,39), said transmitting coils (36,37) and said receiving coils (38,39) being connected together such that output signals generated in said receiving coils (38,39) have differential relationship with each other.
Claim 2
Dependent Claim
243 words
An electromagnetic ultrasonic apparatus for examining materials by using ultrasonic waves, characterized by a first magnetic pole (10) having an end surface (16) which is brought close and in opposition to a material (14) to be examined; a second magnetic pole (12) having an end surface (18) which is brought close and in opposition to the material (14), and a polarity opposite to that of said first magnetic pole (10); a DC magnetic field generating means (76,78) for supplying a DC magnetic field to said first and second magnetic poles(10,12); a pair of transmitting coils (36,37) which are provided between the material (14) and the end surface (16) of said first magnetic pole (10) and which face different portions of a surface of the material (14); a pair of receiving coils (38,39) which are provided in either a space between the material (14) and the end surface (16) of said first magnetic pole (10) or space between the material (14) and the end surface (18) of said second magnetic pole (12) and which are opposed to said transmitting coils (36,37), respectively; a pulse signal generating means (98) for supplying a pulse current to said transmitting coils (36,37); and a signal control means (114) for amplifying and controlling output signals generated in said receiving coils (38,39), said transmitting coils (36,37) and said receiving coils (38,39) being connected together such that output signals generated in said receiving coils (38,39) have differential relationship with each other.
Claim 3
Dependent Claim
30 words
The apparatus of claim 1, characterized in that said DC magnetic field generating means (76,78) consists of DC exciter coils (88,90) wound around said first and second magnetic poles (10,12).
Claim 4
Dependent Claim
47 words
The apparatus of claim 1 or 2, characterized in that said transmitting coils (36,37) and said receiving coils (38,39) are supported on cassettes (40,42) which are inserted into the central portion of said first and second magnetic poles (10,12), respectively, so as to be detachably fixed therein.
Claim 5
Independent Claim
64 words
The apparatus of any of claims 1 to 3, characterized in that said first and second magnetic poles (10,12) are provided with wheels (28,30) which roll on the surfaces of a material (14) to be examined and which serve to maintain gaps between the end surfaces (16,18) of said first and second magnetic poles (10,12) and those of the material (14) to be examined.
Claim 6
Dependent Claim
200 words
An electromagnetic ultrasonic apparatus for examining materials by using ultrasonic waves, characterized by a first magnetic pole (10) having an end surface (16) which is brought close and in opposition to a material (14) to be examined; a second magnetic pole (12) having an end surface (18) which is brought close and in opposition to the material (14), and a polarity opposite to that of said first magnetic pole (10); a DC magnetic field generating means (76,78) for supplying a DC magnetic field to said first and second magnetic poles (10,12); a pair of transmitting coils (36,37) provided between the material (14) and the end surface (16) of said first magnetic pole (10), cumulatively connected with each other, and facing different- portions of a surface of the material (14); a pair of receiving coils (38,39) provided in a gap between the material (14) and the end surface (18) of said second magnetic pole (12), differentially connected with each other, and opposed to said transmitting coils (36,37); a pulse signal generating means (98) for supplying a pulse current to said transmitting coils (36,37); and a signal control means (114) for amplifying and controlling output signals generated in said receiving coils (38,39).
Claim 7
Dependent Claim
200 words
An electromagnetic ultrasonic apparatus for examining materials by using ultrasonic waves, characterized by a first magnetic pole (10) having an end surface (16) which is brought close and in opposition to a material (14) to be examined; a second magnetic pole (12) having an end surface (18) which is brought close and in opposition to the material (14), and a polarity opposite to that of said first magnetic pole (10); a DC magnetic field generating means (76,78) for supplying a DC magnetic field to said first and second magnetic poles (10,12); a pair of transmitting coils (36,37) provided between the material (14) and the end surface (16) of said first magnetic pole (10), cumulatively connected with each other, and facing different- portions of a surface of the material (14); a pair of receiving coils (38,39) provided in a gap between the material (14) and the end surface (18) of said second magnetic pole (12), differentially connected with each other, and opposed to said transmitting coils (36,37); a pulse signal generating means (98) for supplying a pulse current to said transmitting coils (36,37); and a signal control means (114) for amplifying and controlling output signals generated in said receiving coils (38,39).
Claim 8
Dependent Claim
245 words
An electromagnetic ultrasonic appartus for examining materials by using ultrasonic waves, characterized by a first magnetic pole (10) having an end surface (16) which is brought close and in opposition to a material (14) to be examined; a second magnetic pole (12) having and end surface (18) which is brought close and in opposition to the material (14), and a polarity opposite to that of said first magnetic pole (10); a DC magnetic field generating means (76,78) for supplying a DC magnetic field to said first and second magnetic poles (10,12) a pair of transmitting coils (36,37) which are provided in alignment with each other between the material (14) and the end surface (16) of said first magnetic pole (10) and in a plane parallel to the end surface (16) of said first magnetic pole (10) and which are cumulatively connected with each other; a pair of receiving coils (38,39) which are provided in alignment with each other between the material (14) and the end surface (18) of said second magnetic pole (12) and in a plane parallel to the end surface (18) of said second magnetic pole (12) and which are differentially connected with each other; a pulse signal generating means (98) for supplying a pulse current to said transmitting coils (36,37); an amplifier (106) for amplifying output signals generated in said receiving coils (38,39); and a means (112) actuated in response to either transmitted waves or bottom echoes output from said amplifier (106).
Claim 9
Dependent Claim
245 words
An electromagnetic ultrasonic appartus for examining materials by using ultrasonic waves, characterized by a first magnetic pole (10) having an end surface (16) which is brought close and in opposition to a material (14) to be examined; a second magnetic pole (12) having and end surface (18) which is brought close and in opposition to the material (14), and a polarity opposite to that of said first magnetic pole (10); a DC magnetic field generating means (76,78) for supplying a DC magnetic field to said first and second magnetic poles (10,12) a pair of transmitting coils (36,37) which are provided in alignment with each other between the material (14) and the end surface (16) of said first magnetic pole (10) and in a plane parallel to the end surface (16) of said first magnetic pole (10) and which are cumulatively connected with each other; a pair of receiving coils (38,39) which are provided in alignment with each other between the material (14) and the end surface (18) of said second magnetic pole (12) and in a plane parallel to the end surface (18) of said second magnetic pole (12) and which are differentially connected with each other; a pulse signal generating means (98) for supplying a pulse current to said transmitting coils (36,37); an amplifier (106) for amplifying output signals generated in said receiving coils (38,39); and a means (112) actuated in response to either transmitted waves or bottom echoes output from said amplifier (106).
References Cited (Backward Citations)
No citation records indexed.
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