Restricted-range Frequency Scanning of Airborne Reflected Ultrasonic Pulse Amplitudes
Sittisak Siriwitayakorn* Author for corresponding; e-mail address: -
Volume: Vol.34 No.1 (JANUARY 2007)
Research Article
DOI:
Received: 24 Febuary 2006, Revised: -, Accepted: 2 May 2006, Published: -
Citation: Siriwitayakorn S., Restricted-range Frequency Scanning of Airborne Reflected Ultrasonic Pulse Amplitudes, Chiang Mai Journal of Science, 2007; 34(1): 23-28.
Abstract
Effects of various orientations of a reflector on the airborne reflected ultrasonic pulse amplitudes were investigated while keeping both the transeiver set and the target stationary. Frequency scanning of ultrasonic waves was performed in the restricted range of 42.1 to 48.7 KHz. The results revealed that interesting characteristic information of the reflector’s orientation could be gathered using this frequency scanning technique. It is possible that dolphins can utilize this technique to recognise orientations of their hidden-in-sand preys and hence know exactly which way to bite.