Apparatus for detecting persons hidden in vehicles
First Claim
1. A detector unit for detecting the presence of animate bodies in the immediate vicinity of a mobile inanimate structure in a relatively low noise environment comprising:
0 Assignments
0 Petitions
Accused Products
Abstract
A seismic detection system for detecting persons hidden in vehicles inclu a seismic transducer used as a sensing device and electronic processing circuitry for processing the output signals from the seismic transducer. The electronic circuitry detects output signals from the seismic transducer, and, by counting the number of times the signal crosses a preset threshold during a given time window, makes a logic choice between there being personnel or no personnel in the vehicle. If a person or persons are in the vehicle an output is produced and this output is used to actuate audio and/or visual indicators thereby indicating that a person or persons are in the vehicle.
-
Citations
11 Claims
- 1. A detector unit for detecting the presence of animate bodies in the immediate vicinity of a mobile inanimate structure in a relatively low noise environment comprising:
-
2. a seismic transducer adapted to respond to low frequency signals in the single digit Hertz frequency range having at least a selected magnitude and adapted to produce an output signal representative of the frequency and magnitude of said low frequency signal, said low frequency signal being of the substantially continuous pulsating variety produced by heart and lung function in an animate body;
-
magnitude and frequency discriminator means connected to the output of said seismic transducer, said discriminator means adapted to discriminate between signals of continuous duration for a selected period of time and signals of other than continuous duration for said selected period of time, said discriminator means also adapted to discriminate between signals having a magnitude of at least a selected value and signals of lesser magnitude, said discrimination means having an output responsive to signals having a magnitude of at least said selected value and continuous for a selected period of time; and alarm signal means connected to the output of said discriminator means and adapted to produce an alarm signal in response to an output signal therefrom representative of a detected signal of continuous duration for a selected period of time and further characterized by having at least a selected magnitude. - View Dependent Claims (4, 6, 8)
-
Specification