Device and method for detecting intrusion
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United States of America Patent
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Oct 11, 2016
Grant Date -
Jun 18, 2015
app pub date -
Jul 7, 2014
filing date -
Dec 18, 2013
priority date (Note) -
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Abstract
An intrusion detecting device includes a transmitter configured to transmit ultrasonic waves, a receiver configured to receive ultrasonic waves, and a controller configured to control the transmitter to output ultrasonic waves with a reference period, and configured to control a transmission period of the transmitter such that a voltage level of received ultrasonic waves may become equal to a reference voltage level. The controller is configured to determine an intrusion based on the voltage level of the received ultrasonic waves and a frequency of the received ultrasonic waves.
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