http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-766982-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_ac40ffdd0f9b7563bab9d5dccaa8a6b3 |
| classificationCPCAdditional | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G01N2291-0235 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G01N2291-0426 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G01N2291-044 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G01N29-36 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G01N29-0627 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G01N29-2487 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G01N29-11 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G01N29-06 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G01N29-11 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G01N29-24 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G01N29-36 |
| filingDate | 1951-05-28-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_6b43ef650ac48a569de7dda1471d10c4 |
| publicationDate | 1957-01-30-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-766982-A |
| titleOfInvention | Improvements in and relating to the testing of elastic materials |
| abstract | 766,982. Testing materials by ultrasonic waves. NATIONAL RESEARCH DEVELOPMENT CORPORATION. Aug. 28, 1952 [May 28, 1951], No. 12468/51. Class 118 (2). [Also in Group XXXIX] A flaw-detecting apparatus comprises a barium titanate transducer (see Group XXXIX), in an automatically balanced bridge circuit, Fig. 7, which includes transformer winding TW(I). The transducer TR is balanced by an equivalent circuit including resistor Rm, capacitors Cm, Ce, Cmc and an inductor Lm, the resistor and capacitors Ce, Cmc being adjusted by means of servomotors mRm, mCe, mCmc. A materialtesting operation and two bridge balancing operations are performed cyclically. A time base TB synchronizes a motor M, a gating circuit G2 and a cathoderay tube CRT. An oscillator 01, a gating circuit GA and a gating control circuit PL provide pulses for testing purposes. The pulses are of high or low-frequency according to the condition of contacts a, b and are long or short according to the condition of contacts c, d. The transformer winding TW(II) picks up an out-of-balance signal from the bridge circuit and feeds it to an amplifier Al the output of which is used in accordance with the connections made between the contacts e to p in three different operations in each cycle. Phase-shifting networks PS1, PS2 produce outputs respectively in phase and 90 degrees out of phase with the oscillations from 01. They are connected to phase-sensitive rectifieramplifiers PSRA1, PSRA2 which produce outputs depending in value and in sign on the out-of-balance current and are used to control respectively the servomotors mCe and mCmc, mRm together. In the first operation, short high-frequency pulses are fed to TR. Contacts g, m are connected and the out-of-balance current in winding TW(II) is fed through amplifiers A1, A2 to cathode-ray tube CRT which indicates both the transmitted pulse and the reflections. In the second operation, long pulses of lower frequency are used and capacitor Ce is adjusted. Contact pairs e-#, g-h, l-k and i-p are connected to provide a circuit through A1, G2 to PSRA2 the output of which is used to control servomotor mCe. In the third operation long pulses of high frequency are used and a resistor Rm and capacitor Cmc are adjusted. With contact pairs g-h, l-k, j-o and i-n connected, amplifier A1 is connected through gating circuit G2 to both PSRA1, PSRA2 the outputs of which are used to adjust respectively servomotors mRm, mCmc. The control currents for the servomotors are smoothed by circuits of long time constant such as tcl. Specification 766,983, [Group XXXIX], is referred to. |
| priorityDate | 1951-05-28-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
| Predicate | Subject |
|---|---|
| isDiscussedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/compound/CID21225548 http://rdf.ncbi.nlm.nih.gov/pubchem/substance/SID450068310 |
Total number of triples: 22.