POSITION SPECIFYING SYSTEM AND SECURITY SYSTEM

Title:

POSITION SPECIFYING SYSTEM AND SECURITY SYSTEM

Document Type and Number:

Japanese Patent JP2007304956

Kind Code:

A

Abstract:

To provide a position specifying system for specifying a position of an occurrence of a pressure fluctuation phenomenon.

A first to a third pressure sensors 21-23 are arranged in a room space 10 so that they are spaced from one another. When a door 12 is opened or closed, the pressure fluctuation accompanying the opening or closing is detected by the sensors 21-23, but as to the time point at the peak values of the fluctuation, there is a time shift depending on a distance from each sensor position to the door 12. The time shift is converted into a distance difference to the door 12, and hyperbolic curves 52-54 using each two of the sensors 21-23 as focal points are created. Obtaining an intersection point of the hyperbolic curves 52-54 specifies the point of the occurrence of the pressure fluctuation phenomenon.

Inventors:

KATO MASANAO
MIMURA EIJI
MOMEN TOSHIO
SAWAYAMA TOMOYUKI

Application Number:

JP2006133958A

Publication Date:

November 22, 2007

Filing Date:

May 12, 2006

Export Citation:

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Assignee:

KANSAI ELECTRIC POWER CO

International Classes:

G08B13/20; G08B25/04

Domestic Patent References:

JP2001243562A	2001-09-07
JP2000121719A	2000-04-28
JP2004085455A	2004-03-18
JPH11313359A	1999-11-09
JPH10208170A	1998-08-07

Attorney, Agent or Firm:

Etsushi Kotani
Takao Ito
Jiro Higuchi

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