열음향(Thermoacoustic) 레이저의 음향파 특성 분석
The Analysis of Acoustic Waves generated by a TA(ThermoAcoustic) Laser Pair
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조회
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다운로드
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참고문헌
키워드
초록
SoundwavesandacousticenergygeneratedbytwoidenticalTA (ThermoAcoustic)laserswereanalyzedandstudied. OneendoftheceramicstackwasheatedbyathinNiCrwirewoundaroundthatend.Theotherendofthestackwas cooledbynaturalconvectionofatmosphericair.ThewavelengthofthesoundwavesgeneratedbyasingleTA laser wasfourtimesthetubelengthandtheamplitudeofthewavesincreasedwiththeheatingrate.SPL(SoundPressure Level)metersandmicrophoneswereemployedtomeasureandstudythesoundwavesatdifferentdistancesfrom the glasstubeopeningandatthefocusingpointoftheTA laserpairfordifferentlaserpositionarrangements.Thesound wavesofthetwoTA lasersatthefocusingpointwerefoundtobealmost180degreesoutofphasewhentheopenings ofthetwolaserswereveryclosetoeachotherandtheanglebetweenthelaseraxeswassmall.WhenthetwoTA laserswereplacedfarapart,thesoundwaveamplitudesandthephasedifferencebetweenthetwolaseroutputsvaried periodicallywithtime.ThefrequenciesofthesoundwaveschangedwhentheopeningsofthetwoTA laserswerein closevicinityandtheanglebetweenthelaseraxesexceededacertainvalue.Inthiscase,theglasstubeopeningwas nolongerapressureanti-nodeandthewavelengthofthefundamentalmodewasnotequaltofourtimesthetubelength.
Abstract
SoundwavesandacousticenergygeneratedbytwoidenticalTA (ThermoAcoustic)laserswereanalyzedandstudied. OneendoftheceramicstackwasheatedbyathinNiCrwirewoundaroundthatend.Theotherendofthestackwas cooledbynaturalconvectionofatmosphericair.ThewavelengthofthesoundwavesgeneratedbyasingleTA laser wasfourtimesthetubelengthandtheamplitudeofthewavesincreasedwiththeheatingrate.SPL(SoundPressure Level)metersandmicrophoneswereemployedtomeasureandstudythesoundwavesatdifferentdistancesfrom the glasstubeopeningandatthefocusingpointoftheTA laserpairfordifferentlaserpositionarrangements.Thesound wavesofthetwoTA lasersatthefocusingpointwerefoundtobealmost180degreesoutofphasewhentheopenings ofthetwolaserswereveryclosetoeachotherandtheanglebetweenthelaseraxeswassmall.WhenthetwoTA laserswereplacedfarapart,thesoundwaveamplitudesandthephasedifferencebetweenthetwolaseroutputsvaried periodicallywithtime.ThefrequenciesofthesoundwaveschangedwhentheopeningsofthetwoTA laserswerein closevicinityandtheanglebetweenthelaseraxesexceededacertainvalue.Inthiscase,theglasstubeopeningwas nolongerapressureanti-nodeandthewavelengthofthefundamentalmodewasnotequaltofourtimesthetubelength.
참고문헌 (12)
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