A low cost method to sense vibration using laser distance sensor

Lim, Chin Chuan (2014) A low cost method to sense vibration using laser distance sensor. Universiti Malaysia Sabah. (Unpublished)

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Abstract

This thesis reports a non-contact method of measuring the relative amplitude, natural frequency and damping ratio of vibration. The low cost model presented in this thesis exploits simple design with sufficient high sensitivity, that make it suitable for practical use. Laser approach is discussed in this thesis for the detection of vibration - by using a laser diode and photo detector. The laser beam was pointed at the reflecting surface of a vibrating loud speaker, with frequency controlled by a function generator. The vibrating loud speaker caused changes in the light intensity that received by the photo detector, thus output voltage of different values. Voltage reading was performed by using an Arduino nano board, while the relative amplitude, natural frequency and damping ratio of the vibration was computed by ActionScript 3.0 in Flash. Displacement sensitivity of the sensor is in the range of millimeters and centimeters, while the vibrating frequency range is below 50Hz. The sensor has shown good accuracy when the vibration frequencies are below 10Hz. However the system is observed to have difficulties In detecting higher frequencies of vibration.

Item Type: Academic Exercise
Uncontrolled Keywords: laser diode, photo detector, low cost, vibration, amplitude, frequency
Subjects: Q Science > QC Physics
Divisions: FACULTY > Faculty of Science and Natural Resources
Depositing User: Munira
Date Deposited: 20 Nov 2017 02:08
Last Modified: 20 Nov 2017 02:08
URI: http://eprints.ums.edu.my/id/eprint/16880

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