Multi-zone intrusion detection system

• US 3,986,182 A
• Filed: 01/21/1975
• Issued: 10/12/1976
• Est. Priority Date: 03/27/1974
• Status: Expired due to Term

• Current Assignee: Sontrix Incorporated
• Original Assignee: Sontrix Incorporated
• Inventors: Hackett, Kenneth R.
• Primary Examiner(s): Swann, III, Glen R.
• Application Number:
  US05/542,695
• Time in Patent Office: 630 Days
• Field of Search: 340/258 A, 340/225, 340/15, 343/7.7, 343/5 PD
• US Class Current: 340/525
• CPC Class Codes: G01S 13/56 for presence detection presence detection using near field arrangements G01V3/00, e.g. G01V3/08, G01V3/12; burglar, theft or intruder alarms with electrical actuation G08B13/22 - G08B13/26
• CPC Class Codes: G01S 15/523 for presence detection burglar, theft or intruder alarms G08B13/00, e.g. G08B13/16
• CPC Class Codes: G08B 13/1618 using ultrasonic detection means

Abstract

An ultrasonic intrusion detection system having means for transmitting and receiving ultrasonic energy within a protected zone and generating an alarm when a moving object is present in the protected zone is supplemented to provide multiple independent response zones utilizing the same transmitter for all zones but individual receiver modules which can be added to the existing transmitter-receiver system to provide protection for additional independent zones with associated indicators for selectively indicating those zones which have been triggered by the presence of an intruder or other moving object.

Claims

1. A multiple zone ultrasonic intrusion detection system comprising:

a master oscillator for generating power at ultrasonic frequency;

first transmitting transducer means energized by said master oscillator for radiating ultrasonic wave energy into a first zone;

first receiving transducer means for receiving ultrasonic wave energy from said first zone and converting received waves into electric signals;

second transmitting transducer means energized by said master oscillator for radiating ultrasonic waves into a second zone;

second receiving transducer means for receiving ultrasonic waves from said second zones and converting received waves into electric signals;

means for processing said electric signals from said first and second receiving transducer means to recover separate Doppler shifted components arising from moving objects within the respective zones; and

means responsive to said Doppler shifted components of predetermined magnitude for selectively indicating at a central location which of said zones contains a moving object.

2. A multiple zone ultrasonic intrusion detection system comprising:

ultrasonic transceiver means including an ultrasonic generator and transducers for transmitting and receiving ultrasonic waves within a first zone and detector means for detecting Doppler shifted components during the presence of one or more moving objects in said first zone;

means for transmitting ultrasonic waves derived from said generator in said transceiver means into one or more additional zones;

separate receiver transducer means in each of said additional zones including detector means for detecting Doppler shifted components during the presence of a moving object in the respective additional zones; and

alarm means at a central location coupled to respond respectively to said Doppler shifted components in each of said zones for identifying each zone in which a moving object is located.

3. A multiple zone ultrasonic intrusion detection system comprising:

an ultrasonic wave transmitter having a master oscillator coupled to transducer means for propagating ultrasonic waves into a plurality of separate zones;

receiving means for each of said zones coupled to said master oscillator and responsive to said ultrasonic waves propagated and reflected in each respective zone for producing separate Doppler shifted signal components corresponding to moving objects in the respective zones; and

indicator means at a central location responsive to said Doppler shifted components greater than a predetermined threshold for selectively indicating each zone in which a moving object is located.

4. Apparatus accordingly to claim 3 in which said system is adapted for multiple additional zones by providing:

additional transmitting transducer means for each additional zone;

means coupling said additional transmitting transducer means to said master oscillator for propagating ultrasonic energy in each said additional zone;

individual additional said receiving means for each said additional zone; and

said indicator means including individual additional indicators at said central location for each said additional zone.

5. A receiver-signal processor module for multi-zone system expansion of an ultrasonic intruder detection system having receiving transducers located in each protected zone, a source of transmitter ultrasonic energy with means for radiating said transmitter energy in each protected zone, and central alarm means, comprising:

receiver input terminals adapted for coupling to said receiving transducers located in a particular zone associated with said module;

transmitter frequency reference input terminals adapted for coupling to said source of transmitter ultrasonic energy for said multi-zone system;

signal processing circuits operable in response to signals on said receiver input terminals and said transmitter frequency reference input terminals for detecting Doppler signal components resulting from moving objects in said particular zone;

means for producing a signal actuation in response to said Doppler signals corresponding to the presence of a moving intruder in said particular zone; and

a circuit for actuating said central alarm means in response to said signal actuation to indicate the zone in which said moving intruder is located.