Abstract
A compact measurement system for harmonic vibration based on photoelectric array is proposed. Cooperating with a planar reflective mirror, which is fixed on the measured vibrating table, the photoelectric array outputs a vibration-sensitive signal. Theoretical model and simulation are discussed for the optical sensor. A frequency-tracking algorithm is proposed to realize effective measurement of vibration amplitude and frequency. Experiments are carried out on a precision vibrating table at different vibrating frequencies and different drive voltages, and reasonable results are achieved. Finally, taking the vibration with maximum amplitude as an example, the measurement results by laser Doppler interferometer are a frequency of 10 Hz and an amplitude of 72.25 μm, the measurement results by the optical sensor are a frequency of 10 Hz and an amplitude of 72.05 μm. Theoretical and experimental results show the feasibility of this system in harmonic vibration parameter measurements.
Highlights
It is very important to measure the vibration parameters of the vibrator precisely
In order to understand the performance of the optical sensor system and accuracy of the parameter algorithm, we tested under static conditions to observe the sums of inner PDs and outer PDs, and calculate the ratio of sum and difference
An optical device with a 300 μm diameter composed of a vertical cavity surface emitting laser (VCSEL) and nine PDs was fabricated on a silicon base of 2 mm × 2 mm (Board_1) and Board_1 was fixed on the stationary fixture
Summary
It is very important to measure the vibration parameters of the vibrator precisely. The vibrating strength is an important factor for the machine performance, safety, and lifetime, so the vibrating amplitude can be detected by microdisplacement measurements. The optical fiber sensor is based on the principle of light intensity modulation. A laser emitted from a central fiber is reflected by a measured object and received by a tightly aligned optical fiber beam, so the sensor is very sensitive to the displacement and surface reflectivity.. When the measured plane and the end face of the sensor are not completely parallel, the reflected light intensity is affected by the displacement and surface reflectivity, and affected by the tilt angle simultaneously. Puangmali et al discussed the different fiber array and algorithm to reduce the effect of reflectivity and tilt angle.
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