http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-109991590-B
Outgoing Links
| Predicate | Object |
|---|---|
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G01S7-52004 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G01S7-52 |
| filingDate | 2019-02-21-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 2021-02-02-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 2021-02-02-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | CN-109991590-B |
| titleOfInvention | System and method for testing low-frequency emission characteristic of transducer in pressure tank in limited space |
| abstract | The invention belongs to the technical field of underwater acoustic sensor parameter testing, and mainly relates to a system and a method for testing the low-frequency emission characteristic of a transducer in a pressure tank in a limited space. A signal source generates a complex linear frequency sweeping signal, a low-frequency transducer is excited by a power amplifier to generate sound waves, and the sound waves are transmitted through different paths and received by a standard hydrophone. And (4) carrying out conjugate multiplication on the obtained receiving signal and the transmitting signal to obtain a complex transmission function of the system, and carrying out filtering on the complex transmission function. The measured frequency is used as the central frequency of the filter, the frequency deviation generated by the direct sound and the reflected sound is used as the bandwidth of the filter, the influence of the reflected wave is eliminated through multiple times of filtering, the direct wave signal corresponding to the required test frequency is obtained, and finally the sending response and the sound source level of the low-frequency transmitting transducer are obtained. |
| priorityDate | 2019-02-21-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 16.