IMPROVING OPTICAL FIBER SENSING BY MIMO SIGNAL PROCESSING
Journal Title: Informatyka Automatyka Pomiary w Gospodarce i Ochronie Środowiska - Year 2016, Vol 6, Issue 3
Abstract
Optical fiber sensors have reached a high state of maturity. Besides the high number of sensor groups, multi-mode fiber evanescent field sensors can be found in a lot of applications. Here, the signal source commonly excites many optical modes under steady-state conditions. Perturbations of the fiber then produce leaky modes. Thus, a simple intensity detector measures the degree of perturbation. In some cases also restricted mode launching conditions have been applied. They resulted in higher sensitivity but showed a narrower measurement range. Considering the individual modes as carriers of information we adapted multiple-input multiple-output (MIMO) signal processing which is well studied in the telecommunications community, for improvements on both the sensor sensitivity and its measurement range. In this paper MIMO signal processing is investigated for fiber optic sensor applications. A (2x2) MIMO implementation is realized by using lower-order and higher-order mode groups of a gradient-index multi-mode fiber as separate transmission channels. A micro-bending pressure sensor changes these separate transmission characteristics and introduces additional crosstalk. By observing the layer specific weight-factors of the MIMO system the amount of load applied was determined. Experiments verified a good correlation between the change of the MIMO weight coefficients and the load applied to the sensor and thus verified that MIMO signal processing can beneficially be used for fiber optic sensor applications. The experimental results also verified the superior sensitivity and measurement range when MIMO signal processing is utilized.
Authors and Affiliations
Andreas Ahrens, André Sandmann, Kort Bremer, Bernhard Roth, Steffen Lochmann
Keywords
Related Articles
- EP ID EP81507
- DOI -
- Views 96
- Downloads 0
ZASTOSOWANIE WNIOSKOWANIA ROZMYTEGO DO ZADANIA ROZPOZNAWANIA PRZEPŁYWÓW DWUFAZOWYCH GAZ-CIECZ
W artykule autorzy zaprezentowali nową metodę rozpoznawania typu przepływu dwufazowego mieszanin gaz-ciecz opartą na wnioskowaniu rozmytym. We wstępie artykułu czytelnik znajdzie informacje na temat instalacji badaw...
WIRELESS SENSOR PHYSICAL ACTIVITY BASED ON LOW-POWER PROCESSOR
In this article the authors review the state of the art modern equipment used to measure the physical activity of man. In addition, they representa unique project built wireless sensor human activity which is a response...
ROZPOZNAWANIE EMOCJI W TEKSTACH POLSKOJĘZYCZNYCH Z WYKORZYSTANIEM METODY SŁÓW KLUCZOWYCH
Dynamiczny rozwój sieci społecznościowych sprawił, że Internet stał się najpopularniejszym medium komunikacyjnym. Zdecydowana większość komunikatów wymieniana jest w postaci widomości tekstowych, które niejednokrotnie od...
METHODS FOR DETECTION ANALYSIS IN QUALITY CONTROL SYSTEM
The article contains a description of the quality control system based on optical detection algorithms. It plays an increasingly important in the production process. The development of new systems based on the technology...
THE PROBLEM OF SYSTEM FAULT-TOLERANCE
System level self-diagnosis (SLSD) has been deeply investigated in literature. It aims at diagnosing systems composed by units, whichare required to be able to test each other by exchanging information through available...