GB933564A - Improvements in and relating to ultrasonic flaw-detectors - Google Patents
Improvements in and relating to ultrasonic flaw-detectorsInfo
- Publication number
- GB933564A GB933564A GB2428260A GB2428260A GB933564A GB 933564 A GB933564 A GB 933564A GB 2428260 A GB2428260 A GB 2428260A GB 2428260 A GB2428260 A GB 2428260A GB 933564 A GB933564 A GB 933564A
- Authority
- GB
- United Kingdom
- Prior art keywords
- memory circuit
- flaw
- sensitivity
- pulse
- amplifier
- 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
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/30—Arrangements for calibrating or comparing, e.g. with standard objects
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material 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 Ultrasonic Waves (AREA)
Abstract
933,564. Ultrasonic inspection devices. J. OBRAZ. July 12, 1960 [Aug. 19, 1959], No. 24282/60. Class 40 (7). A device for automatically adjusting the sensitivity of ultrasonic flaw detection apparatus comprises a first memory circuit which registers the sum of the amplitudes of all impulses fed to it in a preselected time interval of not less than the flaw echo time plus the final echo time, and a second memory circuit connected to receive information from the first memory circuit and to control the sensitivity of the detection apparatus, the contents of the first memory circuit being cancelled upon the emission of the succeeding ultrasonic pulse to the material under test and the contents of the second memory circuit being cancelled when the sensitivity has been controlled. Thus undesired increase of receiver sensitivity which would otherwise arise if the " bottom echo " alone were used for automatic gain control (A.G.C.) purposes is avoided. Reflected signals from transmitted pulses of constant p.r.p. are fed to video amplifiers 5, 6 after detection; amplifier 5 output is gated in valve 10 by a pulse from monostable multivibrator 9 of such timing and duration as to embrace flaw and bottom echoes. Valve 10 output is accumulated on capacitor 13 which is discharged at each pulse transmission from transducer 3. The simultaneous charging of capacitor 16, which is discharged by a pulse generated at the termination of the sawtooth time base of cathode-ray oscilloscope 7, provides a voltage which is compared with the adjustable voltage across potentiometer 22 tap and cathode follower 25 feeds the ensuing A.G.C. voltage to amplifier 6. Thyratron-controlled relay 28 actuates an alarm when no flaw or bottom echo is present at amplifier 4 output; the relay may also stop the supply of material being tested when automatic and continuous testing is being employed.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CS480359 | 1959-08-19 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB933564A true GB933564A (en) | 1963-08-08 |
Family
ID=5391593
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2428260A Expired GB933564A (en) | 1959-08-19 | 1960-07-12 | Improvements in and relating to ultrasonic flaw-detectors |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB933564A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3415110A (en) * | 1964-07-31 | 1968-12-10 | Automation Ind Inc | Ultrasonic inspection |
US3646805A (en) * | 1969-10-03 | 1972-03-07 | Amf Inc | Ultrasonic flaw detection circuit |
-
1960
- 1960-07-12 GB GB2428260A patent/GB933564A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3415110A (en) * | 1964-07-31 | 1968-12-10 | Automation Ind Inc | Ultrasonic inspection |
US3646805A (en) * | 1969-10-03 | 1972-03-07 | Amf Inc | Ultrasonic flaw detection circuit |
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