Intrusion detection sensor

• US 7,760,088 B2
• Filed: 06/22/2006
• Issued: 07/20/2010
• Est. Priority Date: 06/24/2005
• Status: Expired due to Fees

• Current Assignee: Optex Company Limited (OPTEX GROUP Co., Ltd.)
• Original Assignee: Optex Company Limited (OPTEX GROUP Co., Ltd.)
• Inventors: Tsuji, Masatoshi
• Primary Examiner(s): Goins; Davetta W
• Assistant Examiner(s): Lau; Hoi C
• Application Number:
  US11/922,473
• Publication Number:
  US 20090079563A1
• Time in Patent Office: 1,489 Days
• Field of Search: 340/552, 340/541, 340/554, 342/107, 342/28, 342/90, 342/174, 342/114, 342/173, 342/104, 342/115, 342/106, 342/68, 342/189, 342/162, 342/195, 342/157, 342/158
• US Class Current: 340/552
• CPC Class Codes: G01S 13/04 Systems determining presence of a target based on relative movement of target G01S13/56
• CPC Class Codes: G01S 13/06 Systems determining position data of a target
• CPC Class Codes: G01S 13/886 for alarm systems alarms with electrical actuation G08B13/22
• CPC Class Codes: G01V 8/005 operating with millimetre waves, e.g. measuring the black losey radiation
• CPC Class Codes: G08B 13/187 by interference of a radiation field
• CPC Class Codes: G08B 13/2494 by interference with electro-magnetic field distribution combined with other electrical sensor means, e.g. microwave detectors combined with other sensor means

Abstract

According to an embodiment, an intrusion detection sensor includes a microwave sensor (120) that transmits microwaves toward a detection area, receives the microwaves reflected by an object present in the detection area, and outputs a reflected wave reception intensity signal according to the received intensity; a direction variable antenna device (110); a scanning measurement means (131) that provides an instruction to scan the transmission/reception direction to the direction variable antenna device (110) to determine a relationship with the output of the reflected wave reception intensity signal; a detection target object presence determination means (132) that determines whether or not a detection target object is present based on the determined relationship; and an alarm signal output control means (133) that outputs an alarm signal when it is determined that a detection target object is present.

Claims

1. An intrusion detection sensor comprising:

a microwave sensor that transmits microwaves toward a detection area, receives the microwaves reflected by an object present in the detection area, and outputs a reflected wave reception intensity signal according to the received intensity;

a direction variable antenna device that can change the direction of the microwaves transmitted/received from/by the microwave sensor within a predetermined range of angle;

a scanning measurement means that provides, to the direction variable antenna device, an instruction to scan the predetermined range of angle of the transmission/reception direction so as to determine a relationship between the transmission/reception direction and the output of the reflected wave reception intensity signal;

a detection target object presence determination means that determines whether or not a detection target object is present based on the relationship between the transmission/reception direction and the output of the reflected wave reception intensity signal determined by the scanning measurement means; and

an alarm signal output control means that performs control so that an alarm signal is outputted when the detection target object presence determination means determines that a detection target object is present wherein the reflected wave reception intensity signal is a voltage signal having a positive correlation with the received intensity, and the detection target object presence determination means determines obtained by integrating the electrical power value of the reflected wave reception intensity signal over the predetermined range of angle is not less than a predetermined ratio.

2. The intrusion detection sensor according to claim 1, further comprising:

a passive type infrared sensor that receives infrared rays from the detection area, and outputs an infrared detection signal indicating the presence of a detection target object in the detection area based on a temperature difference from its surroundings,

wherein the alarm signal output control means does not output the alarm signal when the infrared detection signal is not outputted from the passive type infrared sensor.

3. The intrusion detection sensor according to claim 2, further comprising:

a detection target object direction identification means that identifies a direction in which a detection target object is present based on the relationship between the transmission/reception direction and the output of the reflected wave reception intensity signal determined by the scanning measurement means; and

a direction storage means that stores the direction identified by the detection target object direction identification means as detection restriction direction information when the detection target object presence determination means determines that a detection target object is present, and when the infrared detection signal is not outputted from the passive type infrared sensor,

wherein the alarm signal output control means does not output the alarm signal even when the detection target object presence determination means determines that a detection target object is present, when a difference between the direction identified by the detection target object direction identification means and the direction corresponding to any of the detection restriction direction information stored in tie direction storage means falls within a predetermined range.

4. The intrusion detection sensor according to claim 3,

wherein the detection restriction direction information stored in the direction storage means is deleted when the detection target object presence determination means continues to determine that no detection target object is present for a predetermined length of time.

5. The intrusion detection sensor according to claim 1, wherein the direction variable antenna device is a phased array antenna.

6. An intrusion detection sensor comprising:

a microwave sensor that transmits a plurality of types of microwaves of different frequencies toward a detection area, receives reflected waves of the respective microwaves that have been reflected off of an object present in the detection area, and outputs distance information corresponding to a distance to the object;

a direction variable antenna device that can change the direction of 20 the plurality of types of microwaves transmitted/received from/by the microwave sensor within a predetermined range of angle;

a scanning measurement means that provides, to the direction variable antenna device, an instruction to scan the predetermined range of angle of the transmission/reception direction and monitors the distance information during the scanning so as to determine a direction in which the object is present and detected object distance information to the object;

an object movement distance recognition means that determines a movement distance per unit of time of the object based on a change in the detected object distance information over time;

a detection target object presence determination means that determines that a detection target object is present in the detection area when the movement distance per unit of time determined by the object movement distance recognition means is not less than a predetermined threshold value;

a passive type infrared sensor that receives infrared rays from the detection area, and outputs an infrared detection signal indicating the presence of a detection target object in the detection area based on a temperature difference from its surroundings;

a direction storage means that stores the direction in which an object is identified to be present by the scanning measurement means as detection restriction direction information when the detection target object presence determination means determines that a detection target object is present, and when the infrared detection signal is not outputted from the passive type infrared sensor; and

an alarm signal output control means that performs control so that an alarm signal is outputted when the detection target object presence determination means determines that a detection target object is present, and when the infrared detection signal is outputted from the passive type infrared sensor,

wherein the predetermined threshold value used by the detection target object presence determination means to determine the presence or absence of a detection target object is changed to a greater value, when a difference between the direction in which an object is identified to be present by the scanning measurement means and the direction corresponding to any of the detection restriction direction information stored in the direction storage means falls within a predetermined range.

7. The intrusion detection sensor according to claim 6,

wherein the detection restriction direction information stored in the direction storage means is deleted when the detection target object presence determination means continues to determine that no detection target object is present for a predetermined length of time.

8. The intrusion detection sensor according to claim 6, wherein the direction variable antenna device is a phased array antenna.

9. An intrusion detection sensor comprising:

a microwave sensor that transmits a plurality of types of microwaves of different frequencies toward a detection area, receives reflected waves of the respective microwaves that have been reflected off of an object present in the detection area, and outputs distance information corresponding to the distance to the object;

a direction variable antenna device that can change the direction of the plurality of types of microwaves transmitted/received from/by the microwave sensor within a predetermined range of angle;

a scanning measurement means that provides, to the direction variable antenna device, an instruction to scan the predetermined range of angle of the transmission/reception direction and monitors the distance information during the scanning so as to determine a direction in which the object is present and detected object distance information to the object;

an object movement distance recognition means that determines a movement distance per unit of time of the object based on a change in the detected object distance information over time;

a detection target object presence determination means that determines that a detection target object is present in the detection area when the movement distance per unit of time determined by the object movement distance recognition means is not less than a predetermined threshold value;

a direction input means that inputs a direction that is excluded from the directions to be detected as detection exclusion direction information; and

an alarm signal output control means that performs control so that an alarm signal is outputted when the detection target object presence determination means determines that a detection target object is present, and when the direction in which an object is determined to be present by the scanning measurement means does not correspond to any of the detection exclusion direction information inputted by the direction input means.

10. The intrusion detection sensor according to claim 9,

wherein the scanning measurement means excludes, from the scanning, a direction that corresponds to any of the detection exclusion direction information inputted by the direction input means.

11. The intrusion detection sensor according to claim 10, further comprising:

a passive type infrared sensor that receives infrared rays from the detection area, and outputs an infrared detection signal indicating the presence of a detection target object in the detection area based on a temperature difference from its surroundings,

wherein the alarm signal output control means does not output the alarm signal when the infrared detection signal is not outputted from the passive type infrared sensor.

12. The intrusion detection sensor according to claim 11,

wherein the alarm signal output control means performs control so that the alarm signal is outputted regardless of the determination result of the detection target object presence determination means when all directions are inputted as detection exclusion direction information by the direction input means.

13. The intrusion detection sensor according to claim 9, wherein the direction input means is a DIP switch.

14. The intrusion detection sensor according to claim 13,

wherein the DIP switch is disposed such that each switch element of the DIP switch corresponds to the position of the corresponding direction in the detection area during installation.

15. The intrusion detection sensor according to claim 9, wherein the direction variable antenna device is a phased array antenna.

16. An intrusion detection sensor comprising:

a microwave sensor that transmits a plurality of types of microwaves of different frequencies toward a detection area, receives reflected waves of the respective microwaves that have been reflected off of an object present in the detection area, and outputs distance information corresponding to the distance to the object;

a direction variable antenna device that can change the direction of the plurality of types of microwaves transmitted/received from/by the microwave sensor within a predetermined range of angle;

a scanning measurement means that provides, to the direction variable antenna device, an instruction to scan the predetermined range of angle of the transmission/reception direction and monitors the distance information during the scanning so as to determine a direction in which the object is present and detected object distance information to the object;

an object movement distance recognition means that determines a movement distance per unit of time of the object based on a change in the detected object distance information over time;

a detection target object presence determination means that determines that a detection target object is present in the detection area when the movement distance per unit of time determined by the object movement distance recognition means is not less than a predetermined threshold value;

a position input means that inputs a two-dimensional position to be excluded from the detection area as detection exclusion position information; and

an alarm signal output control means that performs control so that an alarm signal is outputted when the detection target object presence determination means determines that a detection target object is present, and when the direction in which an object is determined to be present and the distance to the object determined by the scanning measurement means do not correspond to any of the detection exclusion position information inputted by the position input means.

17. The intrusion detection sensor according to claim 16, further comprising:

a passive type infrared sensor that receives infrared rays from the detection area, and outputs an infrared detection signal indicating the presence of a detection target object in the detection area based on a temperature difference from its surroundings,

wherein the alarm signal output control means does not output the alarm signal when the infrared detection signal is not outputted from the passive type infrared sensor.

18. The intrusion detection sensor according to claim 16,

wherein the two-dimensional position is a polar coordinate system defined by a direction and a distance.

19. The intrusion detection sensor according to claim 16,

wherein the two-dimensional position is a rectangular coordinate system.

20. The intrusion detection sensor according to claim 16,

wherein the position input means is a DIP switch.

21. The intrusion detection sensor according to claim 16,

wherein the direction variable antenna device is a phased array antenna.

22. An intrusion detection sensor comprising:

a microwave sensor that transmits a plurality of types of microwaves of different frequencies toward a detection area, receives reflected waves of the respective microwaves that have been reflected off of an object present in the detection area, and outputs distance information corresponding to the distance to the object;

a direction variable antenna device that can change the direction of the plurality of types of microwaves transmitted/received from/by the microwave sensor within a predetermined range of angle;

a scanning measurement means that provides, to the direction variable antenna device, an instruction to scan the predetermined range of angle of the transmission/reception direction and monitors the distance information during the scanning so as to determine a direction in which the object is present and detected object distance information to the object;

an object movement distance recognition means that determines a movement distance per unit of time of the object based on a change in the detected object distance information over time;

a detection target object presence determination means that determines that a detection target object is present in the detection area when the movement distance per unit of time determined by the object movement distance recognition means is not less than a predetermined threshold value;

a passive type infrared sensor that receives infrared rays from the detection area, and outputs an infrared detection signal indicating the presence of a detection target object in the detection area based on a temperature difference from its surroundings;

a position storage means that stores the direction in which an object is determined to be present and the distance to the object determined by the scanning measurement means as two-dimensional detection restriction position information when the detection target object presence determination means determines that a detection target object is present, and when the infrared detection signal is not outputted from the passive type infrared sensor; and

an alarm signal output control means that performs control so that an alarm signal is outputted when the detection target object presence determination means determines that a detection target object is present, and when the infrared detection signal is not outputted from the passive type infrared sensor,

wherein the predetermined threshold value used by the detection target object presence determination means to determine the presence or absence of a detection target object is changed to a greater value, when the direction in which an object is determined to be present and the distance to the object determined by the scanning measurement means correspond to any of the detection restriction position information stored in the position storage means.

23. An intrusion detection sensor comprising:

a microwave sensor that transmits a plurality of types of microwaves of different frequencies toward a detection area, receives reflected waves of the respective microwaves that have been reflected off of an object present in the detection area, and outputs distance information corresponding to the distance to the object;

a direction variable antenna device that can change the direction of the plurality of types of microwaves transmitted/received from/by the microwave sensor within a predetermined range of angle;

a scanning measurement means that provides, to the direction variable antenna device, an instruction to scan the predetermined range of angle of the transmission/reception direction and monitors the distance information during the scanning so as to determine a direction in which the object is present and detected object distance information to the object;

an object movement distance recognition means that determines a movement distance per unit of time of the object based on a change in the detected object distance information over time;

a detection target object presence determination means that determines that a detection target object is present in the detection area when the movement distance per unit of time determined by the object movement distance recognition means is not less than a predetermined threshold value;

a distance input means that inputs a distance range to be excluded from the detection area as detection exclusion distance information; and

an alarm signal output control means that performs control so that an alarm signal is outputted when the detection target object presence determination means determines that a detection target object is present, and when the distance to the object determined by the scanning measurement means does not correspond to any of the detection exclusion distance information inputted by the distance input means.

24. The intrusion detection sensor according to claim 23, further comprising:

a passive type infrared sensor that receives infrared rays from the detection area, and outputs an infrared detection signal indicating the presence of a detection target object in the detection area based on a temperature difference from its surroundings,

wherein the alarm signal output control means does not output the alarm signal when the infrared detection signal is not outputted from the passive type infrared sensor.