Ultrasound intrusion detector
First Claim
1. A method for detecting the presence of a moving object in a detection area, comprising:
- emitting a sequence of bursts of ultrasonic energy into the area;
receiving ultrasonic energy reflected from within the detection area, in response to the sequence of bursts, and generating a sequence of signals respectively responsive thereto;
comparing each signal in the sequence with a preceding signal, to find a variation in the signals over the sequence of bursts; and
analyzing the variation in the signals to determine the presence of the moving object,wherein comparing each signal with the preceding signal comprises sampling values of the signals and comparing the sampled values as a function of delay time between emitting the burst and receiving the energy andanalyzing the variation in the signals comprises determining a rate of change of the sampled values compared at a selected delay time.
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Abstract
This invention discloses a method for detecting the presence of a moving object in a detection area, including emitting a sequence of bursts of ultrasonic energy into the area, receiving ultrasonic energy reflected from within the detection area, in response to the sequence of bursts, and generating a sequence of signals respectively responsive thereto, comparing each signal in the sequence with a preceding signal, to find a variation in the signals over the sequence of bursts, and analyzing the variation in the signals to determine the presence of the moving object. Apparatus for detecting the presence of a moving object in a detection area is also disclosed.
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Citations
44 Claims
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1. A method for detecting the presence of a moving object in a detection area, comprising:
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emitting a sequence of bursts of ultrasonic energy into the area; receiving ultrasonic energy reflected from within the detection area, in response to the sequence of bursts, and generating a sequence of signals respectively responsive thereto; comparing each signal in the sequence with a preceding signal, to find a variation in the signals over the sequence of bursts; and analyzing the variation in the signals to determine the presence of the moving object, wherein comparing each signal with the preceding signal comprises sampling values of the signals and comparing the sampled values as a function of delay time between emitting the burst and receiving the energy and analyzing the variation in the signals comprises determining a rate of change of the sampled values compared at a selected delay time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. Apparatus for detecting the presence of a moving object in a detection area, comprising:
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an ultrasound transmitter, which emits a sequence of bursts of ultrasonic energy into the detection area; an ultrasound receiver, which receives ultrasonic energy reflected from the detection area, and generates a sequence of signals, corresponding to the sequence of bursts, responsive to the ultrasonic energy received; and a controller, which receives the signals generated by the receiver, compares each signal in the sequence with a preceding signal to find a variation in the signals over the sequence of bursts and analyzes the variation to determine the presence of the moving object, wherein the controller samples the signal values and determines a rate of change of the sampled values between each signal and the preceding signal. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44)
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Specification