NO751865L - - Google Patents
Info
- Publication number
- NO751865L NO751865L NO751865A NO751865A NO751865L NO 751865 L NO751865 L NO 751865L NO 751865 A NO751865 A NO 751865A NO 751865 A NO751865 A NO 751865A NO 751865 L NO751865 L NO 751865L
- Authority
- NO
- Norway
- Prior art keywords
- pulse
- period
- signal
- amplitude
- gate
- Prior art date
Links
- 238000001514 detection method Methods 0.000 claims description 26
- 239000000463 material Substances 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 12
- 230000001143 conditioned effect Effects 0.000 claims description 8
- 230000004044 response Effects 0.000 claims description 4
- 230000004913 activation Effects 0.000 claims description 3
- 230000006978 adaptation Effects 0.000 claims description 2
- 230000007704 transition Effects 0.000 claims description 2
- 230000003111 delayed effect Effects 0.000 claims 3
- 230000004069 differentiation Effects 0.000 claims 2
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- 239000002184 metal Substances 0.000 description 18
- 239000003990 capacitor Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000005672 electromagnetic field Effects 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000003750 conditioning effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000002923 metal particle Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
- G01V3/10—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
- G01N27/9046—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents by analysing electrical signals
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
- G01N27/9046—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents by analysing electrical signals
- G01N27/906—Compensating for velocity
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Remote Sensing (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Electrochemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Electromagnetism (AREA)
- Environmental & Geological Engineering (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geophysics (AREA)
- Geophysics And Detection Of Objects (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US05/473,643 US3949293A (en) | 1974-05-28 | 1974-05-28 | Apparatus and method for detecting a moving metal mass including means to discriminate signals having a particular period |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NO751865L true NO751865L (ja) | 1975-12-01 |
Family
ID=23880398
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO751865A NO751865L (ja) | 1974-05-28 | 1975-05-27 |
Country Status (19)
| Country | Link |
|---|---|
| US (1) | US3949293A (ja) |
| JP (1) | JPS517954A (ja) |
| AR (1) | AR204664A1 (ja) |
| AU (1) | AU498275B2 (ja) |
| BE (1) | BE829255A (ja) |
| BR (1) | BR7503216A (ja) |
| CA (1) | CA1060970A (ja) |
| DE (1) | DE2523677A1 (ja) |
| DK (1) | DK233975A (ja) |
| ES (1) | ES437399A1 (ja) |
| FR (1) | FR2273288A1 (ja) |
| GB (1) | GB1505186A (ja) |
| IT (1) | IT1038533B (ja) |
| LU (1) | LU72552A1 (ja) |
| NL (1) | NL7506305A (ja) |
| NO (1) | NO751865L (ja) |
| SE (1) | SE401954B (ja) |
| TR (1) | TR19739A (ja) |
| ZA (1) | ZA752757B (ja) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2412081A1 (fr) * | 1977-12-19 | 1979-07-13 | Fadico | Dispositif de detection de la presence d'une piece mecanique, muni d'organes assurant la securite du fonctionnement vis-a-vis de defauts d'isolement dans le circuit du capteur |
| US4193028A (en) * | 1978-05-05 | 1980-03-11 | Honeywell Inc. | Eddy current instrumentation circuitry for distinguishing flaw signals from spurious noise signals |
| GB2136580B (en) * | 1983-03-16 | 1987-11-18 | Thyssen Industrie | Method and apparatus for determining the distance from a conductor |
| JPH0518715Y2 (ja) * | 1987-12-15 | 1993-05-18 |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2577827A (en) * | 1945-10-30 | 1951-12-11 | Charles B Tompkins | Pulse recognition device |
| US2648766A (en) * | 1950-04-19 | 1953-08-11 | Rca Corp | Pulse width discriminator |
| US3065412A (en) * | 1958-12-23 | 1962-11-20 | Union Carbide Corp | Metal detector |
| US3523253A (en) * | 1966-04-15 | 1970-08-04 | Electronic Memories & Magnetic | Coupling network |
| US3609563A (en) * | 1968-11-12 | 1971-09-28 | Coditron Corp | Frequency detector |
| US3706027A (en) * | 1971-07-13 | 1972-12-12 | Karl R Grice Jr | Materials counting system utilizing permanent magnets and their associated fields |
-
1974
- 1974-05-28 US US05/473,643 patent/US3949293A/en not_active Expired - Lifetime
-
1975
- 1975-01-01 AR AR258711A patent/AR204664A1/es active
- 1975-04-29 ZA ZA00752757A patent/ZA752757B/xx unknown
- 1975-04-29 CA CA225,996A patent/CA1060970A/en not_active Expired
- 1975-05-02 AU AU80771/75A patent/AU498275B2/en not_active Expired
- 1975-05-02 ES ES437399A patent/ES437399A1/es not_active Expired
- 1975-05-02 GB GB18412/75A patent/GB1505186A/en not_active Expired
- 1975-05-15 FR FR7515240A patent/FR2273288A1/fr not_active Withdrawn
- 1975-05-16 TR TR19739A patent/TR19739A/xx unknown
- 1975-05-20 BE BE156503A patent/BE829255A/xx unknown
- 1975-05-22 LU LU72552A patent/LU72552A1/xx unknown
- 1975-05-22 BR BR4118/75D patent/BR7503216A/pt unknown
- 1975-05-23 SE SE7505919A patent/SE401954B/xx unknown
- 1975-05-26 DE DE19752523677 patent/DE2523677A1/de not_active Withdrawn
- 1975-05-27 NO NO751865A patent/NO751865L/no unknown
- 1975-05-27 DK DK233975A patent/DK233975A/da unknown
- 1975-05-27 JP JP50063400A patent/JPS517954A/ja active Pending
- 1975-05-27 IT IT23763/75A patent/IT1038533B/it active
- 1975-05-28 NL NL7506305A patent/NL7506305A/xx not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| AU8077175A (en) | 1976-11-04 |
| BE829255A (fr) | 1975-09-15 |
| BR7503216A (pt) | 1976-04-20 |
| GB1505186A (en) | 1978-03-30 |
| NL7506305A (nl) | 1975-12-02 |
| FR2273288A1 (ja) | 1975-12-26 |
| TR19739A (tr) | 1979-10-25 |
| SE401954B (sv) | 1978-06-05 |
| DK233975A (da) | 1975-11-29 |
| ES437399A1 (es) | 1977-01-16 |
| CA1060970A (en) | 1979-08-21 |
| US3949293A (en) | 1976-04-06 |
| AU498275B2 (en) | 1979-03-01 |
| SE7505919L (sv) | 1975-12-01 |
| ZA752757B (en) | 1976-04-28 |
| JPS517954A (ja) | 1976-01-22 |
| DE2523677A1 (de) | 1975-12-11 |
| IT1038533B (it) | 1979-11-30 |
| AR204664A1 (es) | 1976-02-20 |
| LU72552A1 (ja) | 1975-10-08 |
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