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Vol. 172, Issue 6, June 2014, pp. 91-97




Low Frequency Measurement of Mechanical Vibration Using Optocoupler Sensor
and Cantilever System

Warsito, Sri Wahyu Suciyati, Novi Irawan

Physics Department, Faculty of Mathematics and Natural Sciences, University of Lampung Jl. Sumantri Brojonegoro 1, Bandar Lampung Indonesia 35145
Tel.: +62 8154056557, fax: +62 721 704625

E-mail: warsito@fmipa.unila.ac.id


Received: 28 March 2014 /Accepted: 30 May 2014 /Published: 30 June 2014

Digital Sensors and Sensor Sysstems


Abstract: It has been realized and characterized the instrument for low frequency measurement of mechanical vibration by using optocoupler sensors and cantilever system. The realized optocoupler sensor system consists of light emitting diode (LED) and phototransistor. The LED is placed on the end of cantilever and phototransistor is placed on the fixed axe as reference point. The frequency of mechanical vibration on the vertical direction can be shown directly by recording the signal detected by phototransistor. The cantilever used is produced from stainlesstel razor blade that gives a 2.98 Hz natural frequency for 0.28 10-3 kg of sample weight (mp) and 0.2110-3 kg of cantilever weight (mk). The possible measured frequencies are ranged from 1 2.98 Hz. The output of measurement system is directly given in computer by serial interfacing employing microcontroller AT89C51 and MAX232 circuit.


Keywords: Vibration, Optocoupler, Razor blade cantilever.


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