Ultrasonic announcers
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Description
Volume ultrasonic announcers (such as, for example, "Show-window") it is successfully used for protection of rooms. They are intended for penetration detection (penetration attempt) for the protected show-window (volume), movement of objects of the protected volume. The block of processing of a signal (BPS), an acoustic radiator, the acoustic receiver are a part of the announcer. The radiating element of the announcer placed in the block of a radiator represents the piezoelectric ultrasonic converter working in the mode of ultrasound and transforming the voltage with a frequency of 40 Hz developed by the is BAREFOOT generator in acoustic vibrations of air in the protected volume. The sensitive element of the announcer located in the receiver represents the piezoelectric ultrasonic reception converter of acoustic vibrations in a variable electric signal. From a receiver exit the signal comes to the scheme is BAREFOOT which depending on put in it algorithm, forms this or that notice.
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Ultrasonic announcers