Basic Study Converting of Sound Pressure to Electricity with Arrangement of Sound Speaker using Thermoacoustic Technology

This paper describes the suitability of a loudspeaker to be used as a linear alternator. The present study is intended to clarify experimentally that the ability of loudspeaker to detect a frequency of sound wave by applying the sound into a resonator with the different of length. The result of the experiment will determine the suitable length of resonator that give the best reading. The linear alternator is a linear motor which commonly used as an electrical generator. It is a type of alternating current electrical generator. The function of an alternator is to convert mechanical energy to electrical energy. The linear alternator operate under the principle of electromagnetic induction. Unlike linear alternator, other alternator work in rotary motion while the linear alternator work in linear motion. Electromagnetic induction is a result of an electromotive force across an electrical conductor cause by the dynamic interaction with magnetic field. The data of the experiment was conducted based on the three length of resonator. Based on the experiment, all three resonator give the best reading when the operating frequency of 200 Hz was used. The peak to peak voltage recorded for 100 mm length was 776 mV while the peak to peak voltage recorded for 150 mm length was 824 mV. The last resonator give the reading of 776 mV. For the decibel reading, the 100 mm resonator give the reading of 100.2 dB. The resonator of 150 mm give reading of 98.5 dB and the 200 mm give decibel reading of 99.8 dB. For the experiment with heat engine, the highest peak to peak reading is 40.7 mV and the decibel reading is 110.9 dB.