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Auto-sensing and auto-location determination for humidity and gas detection

IP.com Disclosure Number: IPCOM000236704D
Publication Date: 2014-May-09
Document File: 4 page(s) / 67K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method to determine whether dangerous conditions exist in an impenetrable space, as well as a method to identify the specific location order to remedy the situation. The solution comprises autonomous methods for a system to self-locate sensors relative to a base station and then map the sensors to define a room’s layout. With the layout information a sensing unit determines the exact location of an identified dangerous condition.

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Auto-sensing and auto-location determination for humidity and gas detection

Moisture sensors and gas sensors are available to detect dangerous conditions. However, these sensors measure the ambient "in-room" air. These sensors do not measure and dangerous conditions inside walls or closed, confined areas impenetrable by humans. A method is needed to determine whether dangerous conditions exist in an impenetrable space, as well as a method to identify the specific location order to remedy the situation.

The novel contribution is a method to embed a sensor within a wall to determine if dangerous conditions exist within the wall. Then, with the use of Near Field Communication (NFC), a method locates the dangerous condition so that the problem can be fixed before any significant health conditions are encountered. This method can be further expanded to any closed area within a structure such as a basement or attic.

This solution comprises three methods:


 An autonomous method to self-locate sensors relative to a base station


 An autonomous method to map-out sensors to define a room's layout


 A method for locating an alert to determine the exact spot of the dangerous condition

Sensors are placed between every vertical stud facing inward, away from the room. Low voltage electrical wiring is provided from a base station to power each sensor. NFC is used to locate each device relative to the other, referencing the base station at a known fixed point. This method defines the room layout and the location of each sensor. Upon detection of a dangerous condition, the sensor detecting that dangerous condition transmits an alert to the base station. The base station then transmits this information to a central monitoring station indicating the location of the alert.

Figure 1 illustrates a base station attached to the structure at a fixed location. Then, based on this information, the method can map out the structure layout.

Figure 1: Sensor in wall layout

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Figure 2: Sensor layout

Shown in the exploded view is the method used to determine the direction of the nearest neighbor using NFC. Based on the signal strength and the direction of the signal, each sensor can determine the direction of the next neighbor.

Figure 3 depicts the NFC pattern for locating the nearest neighbor for determining the location and pattern of sensors within the structure.

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Figure 3: NFC transmission method for location of nearest neighbors

Figures 2 and 3 shows how a numbering system is used for each sensor. Using the base sensor as position 0, the system transmits signals in all eight directions in sequence. The base station notices as it goes clockwise around the rotation that the first sensor is direction 3....