Multiple zone object detection system
First Claim
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1. Intrusion monitoring apparatus comprising:
- a fixedly positioned source for transmitting a burst of energy in the direction to be monitored;
means for indicating detection of reflection of said energy from objects located within given minimum and maximum distances along said direction;
anmeans for precluding operation of said detection indicating means for reflections from objects located within one or more selected zones between said minimum and maximum distances so as to provide at least two object detection zones of fixed distance from said source with an interposed selected zone thereby permitting intrusion into or passage of objects through each of said selected zones without indication of detection while providing an indication of intrusion of objects into the remaining object detection zones.
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Abstract
Apparatus utilizing a combination energy transmitting and energy receiving transducer or a transducer set consisting of separate energy transmitting and energy receiving transducers, are employed to detect and subsequently indicate the presence of an object(s) within one or more of a plurality of spaced-apart spacial zones.
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Citations
7 Claims
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1. Intrusion monitoring apparatus comprising:
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a fixedly positioned source for transmitting a burst of energy in the direction to be monitored; means for indicating detection of reflection of said energy from objects located within given minimum and maximum distances along said direction;
anmeans for precluding operation of said detection indicating means for reflections from objects located within one or more selected zones between said minimum and maximum distances so as to provide at least two object detection zones of fixed distance from said source with an interposed selected zone thereby permitting intrusion into or passage of objects through each of said selected zones without indication of detection while providing an indication of intrusion of objects into the remaining object detection zones. - View Dependent Claims (2, 3, 4, 5)
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6. A method of monitoring selected areas comprising the steps of:
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transmitting a burst of sonic energy from a fixed point in a direction towards the areas to be monitored; detecting and indicating reception of an echo from objects located within given minimum and maximum distances along the transmission direction while precluding at least indication of an echo from objects located within one or more selected zones along said direction between said given minimum and maximum distances so as to provide at least two detection zones with an interposed selected zone to thereby permit intrusion into or passage of objects through said selected zones without such indication of detection while providing an indication of any object intrusion into the remaining object detection zone. - View Dependent Claims (7)
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Specification