GB1198621A - The Correction of the Undesirable Effects of Dispersion on Signals. - Google Patents
The Correction of the Undesirable Effects of Dispersion on Signals.Info
- Publication number
- GB1198621A GB1198621A GB2000166A GB2000166A GB1198621A GB 1198621 A GB1198621 A GB 1198621A GB 2000166 A GB2000166 A GB 2000166A GB 2000166 A GB2000166 A GB 2000166A GB 1198621 A GB1198621 A GB 1198621A
- Authority
- GB
- United Kingdom
- Prior art keywords
- dispersion
- correction
- plate
- mode
- pulse
- 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
- G01N29/04—Analysing solids
- G01N29/07—Analysing solids by measuring propagation velocity or propagation time of acoustic waves
Landscapes
- Physics & Mathematics (AREA)
- Acoustics & Sound (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
1,198,621. Ultrasonic flow detection. D. O SPROULE. 13 July, 1967 [6 May, 1966], No. 20001/66. Heading H4D. Dispersion in a wave transmission medium is corrected at the receiving end by transmitting the received signal through an "impersive" medium to a further receiver. As applied to ultrasonic flaw detection in a plate 4 (or thinwalled tubing) a short pulse of Lamb waves is generated, the mode of vibration being the first asymmetrical mode, and travels across the plate; higher frequencies travel at higher velocity and the input to receiver 5 is frequency-modulated as shown. If flaws in one particular region are considered a correction system need be provided only for one amount of dispersion (since the amount of dispersion is a function of distance travelled); the correction system utilizes the first symmetrical mode of vibration in a plate 8. For correction of dispersion for signals arriving from any range several receiving transducers 9 are provided and switched into circuit sequentially, Fig. 2 (not shown); a suitable gating pulse generator is based on a nickel delay line, Fig. 3 (not shown). The initial transmitted pulse may be frequency-modulated, Fig. 4 (not shown); pulse compression is achieved as described in Specification 604,429. Coupling the ultrasonic energy into hot material under test is then possible with air as the couplant. The invention is stated to be applicable for radio wave transmission correction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2000166A GB1198621A (en) | 1966-05-06 | 1966-05-06 | The Correction of the Undesirable Effects of Dispersion on Signals. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2000166A GB1198621A (en) | 1966-05-06 | 1966-05-06 | The Correction of the Undesirable Effects of Dispersion on Signals. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1198621A true GB1198621A (en) | 1970-07-15 |
Family
ID=10138689
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2000166A Expired GB1198621A (en) | 1966-05-06 | 1966-05-06 | The Correction of the Undesirable Effects of Dispersion on Signals. |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1198621A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2186084A (en) * | 1985-04-17 | 1987-08-05 | Rolls Royce | Determination of the spectral content of transient stress wave events |
-
1966
- 1966-05-06 GB GB2000166A patent/GB1198621A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2186084A (en) * | 1985-04-17 | 1987-08-05 | Rolls Royce | Determination of the spectral content of transient stress wave events |
| GB2186084B (en) * | 1985-04-17 | 1989-05-24 | Rolls Royce | Determination of the spectral content of transient stress wave events |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PLNP | Patent lapsed through nonpayment of renewal fees |