GB1486408A - Crack and like detectors - Google Patents
Crack and like detectorsInfo
- Publication number
- GB1486408A GB1486408A GB2688673A GB2688673A GB1486408A GB 1486408 A GB1486408 A GB 1486408A GB 2688673 A GB2688673 A GB 2688673A GB 2688673 A GB2688673 A GB 2688673A GB 1486408 A GB1486408 A GB 1486408A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transistor
- oscillator
- meter
- ferrous
- flow
- 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)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
1486408 Electromagnetic flaw detectors NOVALEC Ltd 5 Sept 1974 [5 June 1973] 26886/73 Heading G1N An electromagnetic flaw detector of the type including an oscillator whose output amplitude of oscillations vary in accordance with a flow is arranged for use with ferrous electrically conductive non-ferrous and austenitic materials. A probe comprising coil 11 wound on core 10 of ferrite material having a projecting tip 10a for bringing into contact with a surface of the material to be tested is connected to form part of the frequency determining circuit of grounded ease transistor oscillator 18. The output oscillations developed across emitter resistor 22 are fed via capacitor 26, diode 27 and emitter follower 28 to the base of transistor 37 connected with resistors 38, 39, 41 and diodes 40 to form a bridge circuit across the diagonal of which is connected indicator 42. In operation tip 10a is placed on the material and potentiometer 32 forming part of a clamping circuit for the base of transistor 28 is varied to give a convenient indication on meter 32, the frequency of the oscillator being immaterial. Any subsequent variation in oscillation amplitude indicative of a flow is indicated on meter 42 which may have an arcuate indicator with coloured segments Fig. 3 (not shown).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2688673A GB1486408A (en) | 1974-09-05 | 1974-09-05 | Crack and like detectors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2688673A GB1486408A (en) | 1974-09-05 | 1974-09-05 | Crack and like detectors |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1486408A true GB1486408A (en) | 1977-09-21 |
Family
ID=10250753
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2688673A Expired GB1486408A (en) | 1974-09-05 | 1974-09-05 | Crack and like detectors |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1486408A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0229831A1 (en) * | 1985-07-11 | 1987-07-29 | The Johns Hopkins University | Electromagnetic bone healing sensor |
| CN110530898A (en) * | 2019-08-13 | 2019-12-03 | 北海市产品检验检测中心 | The non-contact real-time detection apparatus of crack initiation inside and outside rock sample |
| CN117849168A (en) * | 2022-11-25 | 2024-04-09 | 利达机电有限公司 | Detection method of commutator reinforcing ring crack detector applied to application equipment of commutator reinforcing ring crack detector |
-
1974
- 1974-09-05 GB GB2688673A patent/GB1486408A/en not_active Expired
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0229831A1 (en) * | 1985-07-11 | 1987-07-29 | The Johns Hopkins University | Electromagnetic bone healing sensor |
| EP0229831A4 (en) * | 1985-07-11 | 1988-04-27 | Univ Johns Hopkins | Electromagnetic bone healing sensor. |
| CN110530898A (en) * | 2019-08-13 | 2019-12-03 | 北海市产品检验检测中心 | The non-contact real-time detection apparatus of crack initiation inside and outside rock sample |
| CN110530898B (en) * | 2019-08-13 | 2024-03-15 | 北海市产品检验检测中心 | Non-contact real-time detection device for internal and external cracking of rock test piece |
| CN117849168A (en) * | 2022-11-25 | 2024-04-09 | 利达机电有限公司 | Detection method of commutator reinforcing ring crack detector applied to application equipment of commutator reinforcing ring crack detector |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3371272A (en) | Electromagnetic sensing probe structure and system for gaging proximity of metals and the like utilizing a linear variable differential transformer | |
| ATE16532T1 (en) | DEVICE FOR NON-DESTRUCTIVE MEASUREMENT OF THE HARDENING DEPTH OF MATERIALS. | |
| GB1525310A (en) | Method and apparatus for measuring the current flowing in a workpiece | |
| GB1533812A (en) | Temperature measuring apparatus | |
| KR880009274A (en) | Non-destructive test method for creep damage of ferromagnetic weak pieces | |
| ATE37088T1 (en) | MEASURING DEVICE FOR CONTACTLESS MEASUREMENT OF LARGE THICKNESS METALLIC MATERIALS ABOVE THE CURIE TEMPERATURE. | |
| US3872380A (en) | Metal detector distinguishing between different metals by using a bias circuit actuated by the phase shifts caused by the metals | |
| ES484335A1 (en) | Inductive type displacement transducers | |
| GB1486408A (en) | Crack and like detectors | |
| CA1270303C (en) | Probe for composite analyzer tester | |
| GB1130870A (en) | Method and apparatus for detecting and measuring cracks in metal structures | |
| GB1373922A (en) | ||
| US3785447A (en) | Weighing device for movable conveyors | |
| US3659194A (en) | Magnetic sensor having a heat treated housing for collimating the sensor{40 s flux | |
| GB1392503A (en) | Electric-storage-battery-fed measuring instruments | |
| GB1318346A (en) | High-frequency eddy-current non-destructuve testing apparatus | |
| GB1070859A (en) | Apparatus for the measurement of changes in diameter of wire or tubular metal and a method for the determination of the corrosion of such metal | |
| GB1392162A (en) | Carburetor flow stand | |
| ELLIS | Eddy current distance gage for precise static measurements(Design and characteristics of eddy current gage for proximity measurements using self-contained, high stability, inductance-capacitance oscillator) | |
| GB1293821A (en) | A device for measuring ferrite content | |
| JPS56112602A (en) | Measuring device for thickness of nonmagnetic thin metal plate | |
| GB794258A (en) | Improvements in or relating to detectors for physical phenomena | |
| FR2229324A5 (en) | Humidity detection and measurement - relies on measurement of resistivity to cause oscillations in loudspeaker | |
| GB1184663A (en) | Improvements in or relating to Magnetic Detecting Apparatus. | |
| GB1115276A (en) | Improvements in or relating to sensing probes |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |