GB888187A - Improvements in apparatus for the electromagnetic testing of materials - Google Patents
Improvements in apparatus for the electromagnetic testing of materialsInfo
- Publication number
- GB888187A GB888187A GB4284659A GB4284659A GB888187A GB 888187 A GB888187 A GB 888187A GB 4284659 A GB4284659 A GB 4284659A GB 4284659 A GB4284659 A GB 4284659A GB 888187 A GB888187 A GB 888187A
- Authority
- GB
- United Kingdom
- Prior art keywords
- coil
- frequency
- test
- current
- inversely proportional
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
888,187. Electric tests. KELVIN & HUGHES Ltd. Nov. 18, 1960 [Dec. 16, 1959], No. 42846/59. Addition to 836,723. Class 37. In an apparatus for the electromagnetic testing of materials including means for establishing in a test coil 10 in which the specimen is located an alternating current inversely proportional to the frequency of the test signal, and means for deriving from the coil a signal proportional to the inductive component of the coil impedance and a signal proportional to the ratio of the change in the resistive component of the coil impedance to the test frequency for application to the respective deflecting elements of a cathode-ray tube, for producing a Forster diagram in the manner described in the parent Specification, the means for establishing the test current in the coil comprises a variable frequency generator 18 connected across a resistor 19 and capacitor 20 in series, the resistance of the former being much greater than the reactance of the latter, whereby the current therethrough is independent of frequency and the potential across the capacitor is inversely proportional to frequency; and means for applying the potential to the combination of the test coil 10 in series with a resistor 22 which is large compared with the reactance of the test coil so that the current through the test coil is substantially inversely proportional to frequency. The voltage at point 27 is subtracted from the voltage at point 26 in an adder circuit 29 after being phase inverted in a unit 28, the output voltage being where K is a constant relating the test current to frequency, L is the coil inductance, and #R the change in resistance. The two components are selected for application to the X and Y plates of a cathode-ray tube 30 by phasesensitive rectifiers 34, 35, fed also with reference signals in quadrature derived from a resistance capacitance circuit 24, 25 connected in parallel with the test coil 11. The paths to the phase-sensitive rectifiers include frequency changers supplied also from the variable oscillator 19 and 20 kc/s. amplifiers 33, 41.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4284659A GB888187A (en) | 1959-12-16 | 1959-12-16 | Improvements in apparatus for the electromagnetic testing of materials |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4284659A GB888187A (en) | 1959-12-16 | 1959-12-16 | Improvements in apparatus for the electromagnetic testing of materials |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB888187A true GB888187A (en) | 1962-01-31 |
Family
ID=10426229
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4284659A Expired GB888187A (en) | 1959-12-16 | 1959-12-16 | Improvements in apparatus for the electromagnetic testing of materials |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB888187A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110263482A (en) * | 2019-07-01 | 2019-09-20 | 贵州省计量测试院 | A kind of vortex impedance method for solving and device based on cross correlation algorithm |
| CN113533842A (en) * | 2021-07-27 | 2021-10-22 | 广东电网有限责任公司 | Coupling coil efficiency testing device and method of wireless charging system |
-
1959
- 1959-12-16 GB GB4284659A patent/GB888187A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110263482A (en) * | 2019-07-01 | 2019-09-20 | 贵州省计量测试院 | A kind of vortex impedance method for solving and device based on cross correlation algorithm |
| CN113533842A (en) * | 2021-07-27 | 2021-10-22 | 广东电网有限责任公司 | Coupling coil efficiency testing device and method of wireless charging system |
| CN113533842B (en) * | 2021-07-27 | 2024-04-30 | 广东电网有限责任公司 | Coupling coil efficiency testing device and method for wireless charging system |
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