HIGHLY FOCUSED ULTRASONIC DEVICE FOR WOMEN SAFETY APPLICATIONS

Abstract

Sound is one of the most important medium used for delivering information. With rising crime in today’s society, especially against women, carrying some sort of effective weapon for self-defense purposes has become quite essential. This technology emits sound in a highly controlled, narrow beam, so that audio can be heard only when you are in the field of beam or in a position to hear the reflected sound from a virtual source .Sound wave in the audible range has a characteristic to spread in various directions while moving, but ultrasound is unidirectional. This characteristic of sound finds applications at a lot of different areas. Parametric loudspeakers can be used in the advertisement industry where audio is considered as a key influence but is abstained from use because the sound being multi-directional spreads and bothers even the people not in target.  Usually, in case of a riot, smoke grenades and tear gases are used to control the rioters, which on addition on controlling the target also affect the innocents. This study highlights on using an ultrasonic weapon rather than weapons like hand gun, which can be unsafe and might also initiate legal intrusion.Nowadays MEMS ultrasonic transducers have been put to use which has got very portable design outlet .The study uses the application of ultrasonic beams and sound focusing to build a portable women safety device similar to that of a stun gun.