http://rdf.ncbi.nlm.nih.gov/pubchem/patent/KR-19990072550-A
Outgoing Links
| Predicate | Object |
|---|---|
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G01B9-02 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G01H9-004 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G01H9-00 |
| filingDate | 1999-02-10-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1999-09-27-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | KR-19990072550-A |
| titleOfInvention | Method and apparatus for interrogation of fiber optic interferometric sensors in multi-channel applications |
| abstract | A technique for calling a fiber optic interferometric sensor, characterized in that an optical signal is modulated by an array of fiber optic sensors in response to acoustic pressure. The modulation signal (channel) in each sensor is multiplexed on a single fiber optic cable, and the multiplexed signal has a polarization diversity detector with more than one output. , PDD). The optical signal is converted into a digital electrical signal. A number of digital down converters demultiplex and demodulate the separate channels, and for each signal channel a number of digital down converters in-phase data ) Is output as quadrature phase data by 90 ° difference. The system controller is connected to digital down converters and calibrated digital down converters. For the purpose of determining the optimal digital down converter setting for each digital down converter, a calibration digital down converter controlled by a system controller simulates the operation of each digital down converter. The system controller updates the optimal settings for each of the digital down converters so that the digital down converter is dynamically calibrated along the optimum settings. Then, the in-phase date output of the digital down converter and the quadrature phase data output by 90 ° are processed in an acoustic signal processor. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/KR-20220069692-A |
| priorityDate | 1998-02-10-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 24.