Abstract:
In the past two decades, the optical sensor has been developed from the
experimental stage to the practical applications. For instance, distributed optical
sensors have been installed in dams and bridges to monitor the performance of
these facilities. It can be anticipate that optical sensors will become widespread
applications in sensing technology.
In this work a design of an optical microvibration sensor has been developed
depending on a laser beam creation. This microvibration sensor consists of three
main parts. The first part is the laser source (laser diode) which can be sense the
vibration on the bodies by direct contact between the laser source and the vibrated
body, or indirect contact which done by directing the beam of laser to the vibrated
body, and receive the reflected part of the beam. The second part is an electronic
circuit (receiver) which contents a photodetector that processes the photo signal to
electric signal. The third part is the output signal device. The type of which can be
varies as required according to nature of study. Speaker, graphometer and
oscilloscope are suggested here.
The results obtained in this work, conclude the developed microvibration
sensor device can efficiently measure the microvibrations applying the direct
contact and indirect contact between the sensor and the vibrated object. The
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strength of the measure signals depends on the physical contact between the laser
and the object in sense by direct contact. This microvibration sensor can be used to
curry the audio signals. And substitution the measuring device with the speakers
makes the microvibration sensor ready to hear low noises (sounds).
