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Ultrasonic Spectral Sound Field Variation Study for Silent Fire Detection
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- Authors
- Kang-Ho Park, Sung Q Lee
- Issue Date
- 2016-07
- Citation
- International Congress on Sound and Vibration (ICSV) 2016, pp.1-8
- Language
- English
- Type
- Conference Paper
- Project Code
- 15PB6100, Development of Smart Video/Audio Surveillance SoC & Core Component for Onsite Decision Security System, Kang-Ho Park
- Abstract
- The ultrasonic spectral sound field variations at multi-tone frequencies are investigated for fire detection. The inaudible ultrasonic sound source is used for the fire detection by measuring the variation of sound field spectra depending on the temperature variation due to the fire. The ultrasonic sound pressure fields generated by an ultrasonic transmitter are measured by an ultrasonic receiver installed within the various security spaces such as a cubic box and a room, and they are analysed in comparison with the simulation results. The ultrasound sources with multitone frequencies around 25 kHz are used to obtain the sound field spectra for the silent detection, and the sound pressure level spectral patterns are measured and analysed during the heating process. We found that the spectral position of interference peaks and the spectral pattern shifts to higher frequency are observed in ultrasound frequencies similarly to the audible sound cases, but the range of fire detection is relatively localized because of the high directional property of the short wavelength ultrasound.
- KSP Keywords
- Audible sound, Fire detection, Multi-tone frequencies, Pressure field, Sound field, Sound pressure level, Sound source, Spectral Pattern, Temperature variations, Ultrasonic Transmitter, Ultrasonic sound