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학술대회
Ultrasonic Spectral Sound Field Variation Study for Silent Fire Detection
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- 발행일
- 201607
- 출처
- International Congress on Sound and Vibration (ICSV) 2016, pp.1-8
- 협약과제
- 15PB6100, 스마트 현장판단형 영상/음향 보안감시 SoC 및 핵심부품 개발, 박강호
- 초록
- 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 제안 키워드
- Audible sound, Fire detection, Multi-tone frequencies, Pressure field, Sound field, Sound pressure level, Sound source, Spectral Pattern, Temperature variations, Ultrasonic Transmitter, Ultrasonic sound