Method for Eliminating Thermal Interference for Infrared and Video-Based Early Fire Detection

Abstract

The invention relates to a process for the elimination of thermal interferences in the infrared and video fire detection at an early stage in waste incineration plants, recycling facilities, warehouses and the like. The process is characterized by an additional noise and vibration analysis, by measuring the noise level of vehicles situated in the area to be detected or other thermal interference sources, with a distinction in measuring the noise level between day mode and night mode. The volume thresholds can thus be determined and be used as a threshold for determining whether a fire extinguishing sequence should be triggered.

Claims

1. A method for the elimination of thermal interferences in the infrared and video fire detection at an early stage in waste incineration plants, recycling facilities, warehouses and the like, characterized by an additional noise and vibration analysis by measuring the noise level of vehicles situated in the area to be detected or other thermal interference sources, such as drive motors of machines, with a distinction in measuring the noise level between day mode and night mode, and the volume thresholds are determined and can be used as a threshold for determining whether a fire extinguishing sequence should be initiated.

2. A method according to claim 1, characterized in that the noise and vibration analysis can be permanent and/or time-controlled.

3. A method according to claim 1, characterized in that the volume levels are determined for the non-working operation, such as night mode, and the operating mode, for example, during daytime.

4. A method according to claim 1, characterized in that analog and/or digital filters, directional microphones, external microphones for a 3-dimensional noise pattern, brand specific noise filters and/or vibration sensors are used for noise and vibration analysis.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings show schematic diagrams of the interference detection via noise analysis for the detection of fires.

[0028] FIG. 1 shows sensors, analysis and the signal output;

[0029] FIG. 2 shows a processing facility and operating noise in the processing facility;

[0030] FIG. 3 shows interference via operating noise of a vehicle; and

[0031] FIG. 4 shows material that is being monitored for a fire and a possible hotspot.

LIST OF REFERENCE NUMERALS

[0032] 1 Processing facility (e.g. for processing of recycling material) [0033] 2 Operating noise in the processing facility [0034] 3 Interference of a motor vehicle (e.g. exhaust of a wheel loader) [0035] 4 Operating noise of the wheel loader [0036] 5 Material that is being monitored for a fire [0037] 6 Hotspot (possible cause of a fire or hidden fire) [0038] 7 IR camera (thermal image camera) [0039] 8 Video camera [0040] 9 Directional microphone [0041] 10 External microphone [0042] 11 Vibration sensor [0043] 12 Analysis [0044] 13 Signal output: fire or hot interference signal (and thus no fire)