Abstract
Two interferometric systems were built, one in bulk optics and other one in fiber optics for showing the instrumentation stage designed for these devices, supported in a photodetector. This stage has a circuit for amplification, analog filtering and software for single channel data acquisition and digital filtering. Based on the Sagnac effect in bulk optics and in fiber optics, the Sagnac interferometer has many applications, nevertheless the methods of construction, design and instrumentation for the sensors used on both types of interferometers are well-known, but very common or general form, for this reason this work approaches some of the methodologies for the design and construction of these devices, obtaining higher sensitivity and better contribution in its respective interferometric paths. We used the simplest design for each interferometer, proposing the best detection limit for each one; to obtain the previous thing, we implement the three previous steps: amplifiers and analogous filters, software for filtering the digital sign. The data acquisition method used to allow us to obtain faster results, using the card of a PC, getting real time measurements and digital processing of the signal.
Highlights
Considering the two well-known configurations of the Sagnac interferometer, in bulk and fiber optics, we know that both have been carried out in multiple researches to be able to determine their maximum theoretical and practical sensibility, but the interferometer in bulk optics has been less studied than the interferometer in fiber optics; this is because according to the principle proposed by Sagnac in the XX century [1,2], it was limited just to a theoretical study but the technology to develop this interferometer came later, until the masers [3,4] and lasers appeared [5,6,7]
Based on the Sagnac effect in bulk optics and in fiber optics, the Sagnac interferometer has many applications, the methods of construction, design and instrumentation for the sensors used on both types of interferometers are well-known, but very common or general form, for this reason this work approaches some of the methodologies for the design and construction of these devices, obtaining higher sensitivity and better contribution in its respective interferometric paths
The main objective of this work resides in demonstrating the reaches in sensibility of the Sagnac interferometer in bulk optics and in fiber optics, based in the new electronic devices to carry out a good instrumentation for both systems
Summary
Considering the two well-known configurations of the Sagnac interferometer, in bulk and fiber optics, we know that both have been carried out in multiple researches to be able to determine their maximum theoretical and practical sensibility, but the interferometer in bulk optics has been less studied than the interferometer in fiber optics; this is because according to the principle proposed by Sagnac in the XX century [1,2], it was limited just to a theoretical study but the technology to develop this interferometer came later, until the masers [3,4] and lasers appeared [5,6,7]. After the existence of the first lasers, the development of the Sagnac interferometer in bulk optics was very limited and just applicable as a system of academic demonstration [8]. There’s much written about the importance of the physical effect or the physical improvements in the Sagnac interferometer in fiber optics for new applications, and in the most of them they use advanced opto-electronic detection systems to work with interferometers [14,15,16]. Part of the objective of this work, is to show the implementation of the opto-electronic sensor system designed with the appropriate instrumentation to achieve good sensed signals of the Sagnac interferometer in bulk optics and in fiber optic by sensing the light intensity at the output of the interferometer, showing the basic principles of sensing, optical detection, opto-electronic transduction and the signal processing
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