Antivibration technique in phase-shifting interferometry
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Abstract:
Known to all,phase shifting interferometry is a well accurate technique and is applied in many fields.Vibration is one of the main error sources in the phase shifting interferometry.A number of methods have been put forward by the researchers all over the world which are classified into two categories,the active and passive vibration resistant techniques.The first is that the system test vibration and compensate it and the latter means to reduce the system's sensitivity of vibration by many techno-method.And the development of them is presented.In the end,the work on these two methods by the author's group is introduced.Keywords:
Phase difference
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This paper describes our recently proposed novel distributed vibration sensing (DVS) measurement technologies for visualizing the state of optical fiber in communication cables. Conventional fault location of optical fiber cable involves the measurement of just optical loss. However, in recent years, attempts have been made to visualize optical fiber attributes that cannot be observed with conventional technology; a key technique is measuring the distribution of dynamic strain caused by vibration. Accurately capturing the vibration makes it possible to measure the state of various fibers that cannot be realized with conventional loss measurements. In measuring vibration, it is necessary to measure not only the power of the light but also several physical parameters such as the vibrational frequency, which is the time variation of the waveform of scattered light, and the phase of the light itself. In addition, it is also necessary to consider the conventional specifications of optical loss measurement techniques, such as distance resolution and measurement distance, which have been considered in the past. In this paper, we introduce several DVS technologies and show their applicability to various state detection schemes for communication fibers.
Optical time-domain reflectometer
Distributed Acoustic Sensing
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