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 112
- Downloads 0
MODELOWANIE GRUNTOWYCH KOLEKTORÓW PIONOWYCH DO POMP CIEPLNYCH
Zbudowano matematyczny model niestacjonarnego procesu dystrybucji ciepła w kolektorze gruntowym. Uwzględniono konwekcyjny transfer ciepła w rurze kolektora oraz rozkład temperatury na głębokości gruntu. Stworzony zo...
WPŁYW ALGORYTMÓW STEROWANIA ROBOTEM MOBILNYM NA PROCES UNIKANIA PRZESZKÓD
W artykule przedstawiono algorytmy sterowania robotem mobilnym. Wykorzystano algorytm oparty o sztuczną sieć neuronową oraz logikę rozmytą. Odległość od przeszkód mierzono za pomocą czujnika ultradźwiękowego. Scharaktery...
ANALYSIS OF THE ELECTRIC FIELD DISTRIBUTION IN THE DRUM SEPARATOR OF DIFFERENT ELECTRODE CONFIGURATION
The static electric field is used in many industrial processes, such as electrostatic separation process. One of the devices that uses a difference in electrical properties of the particles is drum separator. In thi...
PHOTOVOLTAIC POWER PLANT INSPECTION AND DIAGNOSTIC
This paper presents methods of photovoltaic panel inspection in the field. The aim is to verify value of on-site tests. The basic parametersfor comparing the quality of photovoltaic panels are indicated by the manufactur...
GENERALIZED APPROACH TO HURST EXPONENT ESTIMATING BY TIME SERIES
This paper presents a generalized approach to the fractal analysis of self-similar random processes by short time series. Several stages of the fractal analysis are proposed. Preliminary time series analysis includes the...