超聲波頻率的來源

超聲波頻率的來源

因yin為wei有you了le聲sheng音yin的de傳chuan播bo，人ren們men利li用yong聲sheng波bo的de原yuan理li研yan發fa出chu了le各ge種zhong超chao聲sheng波bo設she備bei，第di一yi個ge注zhu意yi到dao這zhe種zhong情qing況kuang的de人ren是shi著zhu名ming的de俄e國guo物wu理li學xue家jia列lie別bie捷jie夫fu。而er早zao在zai1906年nian，學xue生sheng們men便bian研yan究jiu了le獲huo取qu超chao聲sheng波bo振zhen動dong的de方fang法fa，並bing對dui超chao聲sheng波bo進jin行xing了le許xu多duo重zhong要yao的de實shi驗yan。因yin而er運yun用yong在zai工gong業ye上shang，使shi超chao聲sheng波bo焊han接jie機ji在zai工gong業ye上shang做zuo出chu了le重zhong大da貢gong獻xian。

chaoshengbozishensuojuyoudenengliang，shengbochuanbodeguochengzhong，beichuanboshengbodejiezhixishouleyibufen。zhiyubeiximudezhebufennengliangyouduoda，zeyoujiezhidexingzhijueding。zhaolilaishuo
，shengbodenengliangzaiqitizhongbeixishoudejiaoduo，yetizhongximudejiaoshao，gutizhongxishoudehenshao(例如在金屬中，石英晶體中等)，並bing且qie，振zhen動dong的de頻pin率lv愈yu高gao，也ye就jiu說shuo明ming聲sheng音yin愈yu高gao
，被bei吸xi收shou的de能neng量liang就jiu愈yu增zeng多duo。當dang樂le隊dui由you遠yuan而er近jin或huo者zhe由you近jin而er遠yuan的de時shi候hou，所suo聽ting到dao聲sheng音yin便bian是shi證zheng明ming聲sheng波bo吸xi收shou原yuan理li的de好hao例li子zi，隨sui著zhe距ju離li的de增zeng加jia，首shou先xian消xiao失shi的de高gao的de聲sheng音yin
，如ru長chang笛di和he笛di子zi
，然ran後hou是shi中zhong音yin短duan號hao和he中zhong音yin提ti琴qin，當dang距ju離li很hen遠yuan的de時shi候hou，此ci時shi隻zhi能neng聽ting到dao大da鼓gu低di聲sheng音yin了le，超chao低di的de聲sheng音yin傳chuan達da得de極ji遠yuan，超chao聲sheng波bo也ye適shi於yu這zhe個ge原yuan則ze：頻率愈高，吸收愈厲害，而超聲波所能傳播的距離就愈短。 超chao聲sheng波bo振zhen動dong的de上shang限xian大da約yue是shi一yi千qian億yi赫he茲zi
，比bi這zhe個ge數shu字zi更geng高gao的de頻pin率lv的de超chao聲sheng波bo吸xi收shou得de有you多duo厲li害hai，根gen據ju上shang麵mian的de說shuo明ming便bian可ke以yi估gu計ji
，以yi致zhi於yu聲sheng波bo發fa射she器qi的de外wai表biao已yi完wan全quan無wu聲sheng，然ran而er這zhe個ge上shang限xian尚shang未wei達da到dao過guo。目mu前qian，極ji高gao頻pin率lv的de超chao聲sheng波bo是shi蘇su聯lian科ke學xue家jiaCR索科洛夫教授在實際研究中所獲得的
，其頻率大約是一百萬赫茲。