簡稱 HCL管或燈管),該燈管之原理乃是利用不同元素在激態時會放射出特定之可見/ 紫外光譜線,而此譜線正是提供該元素達成激態所需之最佳能量,因此利用不同元素制成陰極,可提供分析該元素所需之光源,由此可知各元素皆擁有各別之燈管,燈管之工作原理如圖所示。 AA燈管構造原理圖 當燈管通電發射出光譜後,經聚焦後射向樣本,與UV不同之處,金屬陽離子由基態到激態所需之能量較大,除特定之光譜能量之外,需另外加熱以提供達到激態所需之活化能 (或是以化學催化劑達成,如冷蒸氣無焰法分析時之用) ,因此送入AA之樣品,利用助燃氣 (空氣或笑氣) 使其霧化,再與燃料 (乙炔,Acetylene)混合後點火燃燒,將燈管所發出之光譜射向火焰,使離子在火焰中達到激發狀態,穿過火焰之光束經過單色光分光棱鏡後,再以狹縫選擇特定之波長送入光電管中轉換成電子訊號,比對樣本與空白水樣間之光能量吸收差異,便可測得水中樣本之離子濃度,典型之AA系統如下圖: 典型原子吸光光譜儀設計概念圖 study.tnit.edu/teacher/shyu/water_ *** y/ecchar5 圖在以上的網頁資料供參考 UV光譜儀...(紫外光可見光分光光譜儀)的原理及構造
參考: 天之心
I do not know what do you want
so I can just give the keyword that may be useful for you to search. Diffraction grating. It works by the contructive interference of different wavelenght by different slits seperations. As you vary the incident angle of the light to the grating
the effective slits seperation change
so the intensity of different wavelenght can seperated out at measure. CCD / photodiode. They operate in similar principle
if a photon (light) shines on it
it will generate a voltage out. The more photons
the higher the voltage output. But CCD can gives a intensity distribution directly but photodiode deso not. But we can still use the photodiode the have the intensity distribution by use with stpper motor.