Scanning fire-monitoring system

• US 4,749,862 A
• Filed: 04/23/1986
• Issued: 06/07/1988
• Est. Priority Date: 04/25/1986
• Status: Expired due to Term

• Current Assignee: Hochiki Kabushiki Kaisha, Kabushiki Kaisha Takenata Komuten
• Original Assignee: Hochiki Corporation, Kabushiki Kaisha
• Inventors: Yoshida, Yoshiyuki, Tsuji, Toshihide, Ohashi, Yoshihiko, Onozuka, Kazutaka
• Primary Examiner(s): FALCONE, JANICE ARRINGTON
• Application Number:
  US06/854,932
• Time in Patent Office: 776 Days
• Field of Search: 250/338, 250/339, 250/342, 250/334, 250/347, 364/516, 364/517
• US Class Current: 250/342
• CPC Class Codes: G08B 17/12 Actuation by presence of radiation or particles, e.g. of infrared radiation or of ions
• CPC Class Codes: G08B 26/00 Alarm systems in which substations are interrogated in succession by a central station

Abstract

A scanning fire-monitoring system comprising a fire source detecting apparatus including a detecting head having a small field of vision and adapted to detect heat radiant energy from a monitoring area, a vertical scanning drive means for letting the detecting head scan within a detection range of small width on the monitoring area, and a horizontal scanning drive means for mounting said detecting head and said vertical scanning drive means thereon and rotatable in a horizontal direction and an arithmetic unit for carrying out a required signal processing and decision on the basis of a detection signal from the detecting head said detecting head being driven in vertical and horizontal directions to scan over the entire monitoring area.

Claims

1. A scanning fire-monitoring system comprising:

fire source detecting apparatus including a detecting head having a limited field of vision and adapted to produce a fire detection signal upon detecting heat energy radiating from a monitoring area;

a vertical scanning means for driving the detecting head in the vertical direction over the monitoring area so as to scan a small width of such area;

horizontal scanning means on which said vertical scanning means and said detecting head are mounted and rotatable in the horizontal direction, whereby the detecting head is driven in the horizontal and vertical directions so as to cyclically scan the entire monitoring area; and

an arithmetic unit connected to said detecting head and responsive to the fire detection signals produced thereby to calculate the positions of fire sources in the monitoring area.

2. A scanning fire-monitoring system as claimed in claim 1, wherein said detecting head comprises a detecting element sensitive to the heat radiant energy and an optical system for limitatively defining an impinging area of the heat radiant energy from the monitoring area on said detecting element so as to provide said small field of vision.

3. A scanning fire-monitoring system as claimed in claim 2, wherein said optical system comprises a stop means for providing said small field of vision.

4. A scanning fire-monitoring system as claimed in claim 3 wherein said optical system comprises a mirror which is driven for rotation in a vertical direction by said vertical scanning drive means.

5. A scanning fire-monitoring system as claimed in claim 4, wherein said mirror is double sided.

6. A scanning fire-monitoring system as claimed in claim 5, which further comprises a vertical position discriminating means for detecting a vertical scanning angle of said detecting head by said vertical scanning drive means and a horizontal position discriminating means for detecting a horizontal scanning angle of said detecting head by said horizontal scanning drive means, said airthmetic unit calculating the position of a fire source from the scanning angles detected by the vertical and horizontal position discriminating means.

7. A scanning fire-monitoring system as claimed in claim 6, wherein said arithmetic means calculates a distance interval between adjacent fire sources when a plurality of fire source positions are detected during one cycle of scanning over said monitoring area, and calculates the position of a fire source by regarding adjacent fire sources as being a single fire source when the calculated distance interval is smaller than a predetermined distance.

8. A scanning fire-monitoring system as claimed in claim 1, wherein said detecting head is a linear array of a plurality of image sensors each responsive to heat radiant energy within said small field of visiion and arranged to detect such energy over the entire monitoring area, such array being integrated with a scanning section and driven by said vertical scanning drive means so as to scan said plurality of elements sequentially.

9. A scanning fire-monitoring system as claimed in claim 8, wherein said image sensors are CCD image sensors.

10. A scanning fire-monitoring systems comprising:

fire source detecting apparatus including a detecting head having a limited field of vision and adapted to produce a fire detection signal upon detecting heat energy radiating from a monitoring area;

a vertical scanning means for driving the detecting head in the vertical direction over the monitoring area so as to scan a small width of such area;

horizontal scanning means on which said vertical scanning means and said detecting head are mounted and rotatable in the horizontal direction, whereby the detecting head is driven in the horizontal and vertical directions so as to cyclically scan the entire monitoring area; and

an arithmetic unit connected to said detecting head and responsive to the fire detection signals therefrom to calculate the positions of fire sources in the monitoring area, such calculation including determining the distance interval between adjacent fire sources in such area and adjacent fire sources being treated as a single fire source when such distance interval is smaller than a predetermined distance;

said detecting head being a linear array of a plurality of CCD image sensors each responsive to heat radiant energy within said small field of vision to detect such energy over the entire monitoring area, such array being integrated with a scanning section driven by said vertical scanning drive means so as to scan said plurality of image sensors sequentially.

11. A scanning fire-monitoring system comprising

two fire source detecting apparatuses each including a detecting head having a small field of vision and adapted to detect heat radiant energy from a monitoring area, a vertical scanning drive means for driving the detecting head to vertically scan a small width of the monitoring area, and a horizontal scanning drive means for mounting said detecting head and said vertical scanning drive means thereon and rotatable in a horizontal direction;

a fire source number discrimination control means which normally actuates only one of the fire source detecting apparatuses for scanning, determines the number of fire sources detected during one cycle of scanning over the entire monitoring area, and actuates the other of the fire source detecting apparatuses only when said number of fire sources is one;

a first fire source position calculating means for calculating the position of a fire source on the basis of scanning data produced by one cycle of scanning over the entire monitoring area by said other fire source detecting apparatus and by said one fire source detecting apparatus; and

a second fire source position calculating means for calculating the positions of fire sources on the basis of horizontal and vertical scanning angles of the positions of the fire sources which have been already obtained by said one fire source detecting apparatus when the number of fire sources determined by said fire source number discrimination control means is two or more.

12. A scanning fire-monitoring system as claimed in claim 11, wherein said detecting head comprises a detecting element sensitive to the heat radiant energy and an optical system for limitatively defining an impinging area of the heat radiant energy from the monitoring area upon said detecting element so as to provide said small field of vision.

13. A scanning fire-monitoring system as claimed in claim 12, wherein said optical system comprises a stop means for providing said small field of vision.

14. A scanning fire-monitoring system as claimed in claim 13, wherein said optical system comprises a mirror which is driven for rotation in a vertical direction by said vertical scanning drive means.

15. A scanning fire-monitoring system as claimed in claim 14, wherein said mirror is double sided.

16. A scanning fire-monitoring system as claimed in claim 15, which further comprises a vertical position discriminating means for detecting the vertical scanning angle of said detecting head produced by said vertical scanning drive means and a horizontal position discriminating means for detecting the horizontal scanning angle of said detecting head produced by said horizontal scanning drive means, each of said fire source position calculating means determining the position of a fire source from the scanning angles detected by the vertical and horizontal position discriminating means.

17. A scanning fire-monitoring system as claimed in claim 11, wherein said detecting head is formed by a linear array of a plurality of CCD image sensors each responsive to heat radiant energy within said small field of vision and arranged to detect such energy over the entire monitoring area, such array being integrated with a scanning section driven by said vertical scanning drive means so as to scan said plurality of elements sequentially.

18. A scanning fire-monitiring system as claimed in claim 17, wherein said image sensors are CCD image sensors.

19. A scanning fire-monitoring system as claimed in claim 18, which further comprises a vertical position discriminating means for detecting the vertical scanning angle of said detecting head provided by said vertical scanning drive means and a horizontal position discriminating means for detecting the horizontal scanning angle of said detecting head produced by said horizontal scanning drive means, each of said fire source position calculating means determining the position of a fire source from the scanning angles detected by the vertical and horizontal position discriminating means.