A simple fiber optic Michelson interferometer for vibration measurement and analysis is presented in this paper. It has been conceived and realized with the purpose of using it as the basic measuring element of a complete system for multiple point vibration measurements. One of its main features is that it is operated in the homodyne mode allowing the detection of the direction of motion without using Bragg cells or other optical or mechanical frequency shifting devices, which usually present some inconveniences (alignment problems, dimensions, complexity of the signal processing electronic and costs). The capability of the fiber interferometer in detecting periodic signals and a comparison with a commercial laser Doppler vibrometer is reported.
A measurement system based on a single-mode fiber optic interferometer has been developed to simultaneously measure the vibrations in terms of velocity. The fiber interferometer reported has been realized with the purpose of using it as the basic measuring sensor of the system. One of its main features is that it is operated in the homodyne mode allowing the detection of the direction of motion without using Bragg cells or other optical or mechanical shifting devices, which usually present different inconveniences. The sensor has been calibrated against a commercial laser vibrometer. The first system prototype developed and presented in this work is capable to measure the vibration on two points simultaneously.
A fiber optic dual Michelson interferometer for vibration measurement and analysis is presented in this paper. One of its main features is that it is operated in the homodyne mode allowing the detection of the direction of motion. The capability of the system in detecting periodic signals is described, through a comparison with a commercial laser vibrometer.
A major problem in directly measuring synchronous belt noise is that, often, the noise coming from bearings, fans or any type of vibration transmitted through the belt drive may be taken for belt noise. In the automotive field, most of the times, the noise generated by belt drives is estimated using microphones in the proximity of belt, crankshafts, idlers...Such a method can be misleading, since it may easily include the contribution of background noise at some frequency. Moreover, a big amount of data is needed to test different layouts and running conditions. This work aims at developing a tool for estimating the acoustic radiation of synchronous belts during the design stage, one of the main objects being that of reducing the high number of tests currently employed.
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