Rancang Bangun Alat Ukur Koefisien Serapan Akustik (Halaman 26 s.d. 30)

Abstract

Abstrak -Abstract -The instrument of acoustic absorption coefficient has been built in the Atomic and Nuclear Laboratory of Physics Department of the FMIPA UGM. The instrument was built works as an impedance tube that propagate the sound waves from the speaker to the source test material in normal directions, causing a standing wave in the tube. The magnitude of sound intensity that is formed in the tube was detected using three microphones, each of which is placed behind the sample, in the middle of the inner tube and in the middle of the outer tube. Impedance tube material used is PVC pipe. The instrument was used to measure the acoustic absorption coefficient of four different materials. .