光谱学与光谱分析
光譜學與光譜分析
광보학여광보분석
SPECTROSCOPY AND SPECTRAL ANALYSIS
2015年
8期
2348-2351
,共4页
光栅单色仪%连续光谱光源%透过率函数%线性拟合
光柵單色儀%連續光譜光源%透過率函數%線性擬閤
광책단색의%련속광보광원%투과솔함수%선성의합
Grating monochromator%Continuous spectrum light source%Transmissivity function%Linear fit
单色仪在加工和安装过程中不可避免的存在误差，必须对其进行标定后才能使用。传统上采用汞灯的标定方法，波长数量有限，限制了单色仪的标定精度。在研究光栅单色仪原理的基础上，提出了一种基于连续光谱光源的单色仪标定方法，设计并搭建了标定实验系统，系统由宽波段光源、光源电源、滤光片、单色仪、光谱仪及计算机构成。采用卤钨灯作为光源，用光谱仪分别测量卤钨灯经单色仪后的辐射、直接测量卤钨灯的辐射，二者相比得到单色仪透过率函数，消除了卤钨灯辐射以及光谱仪响应函数的影响。在刻度盘的某一读数位置，获得单色仪透过率函数并进行归一化，并计算峰值波长，得到一组峰值波长和刻度盘读数的数据。该方法共采集了22组波长数据，用于单色仪的标定。分别采用8点、14点、18点、22点，采用线性拟合和二次拟合，得到了单色仪的波长与刻度盘读数的关系式。标定点数从8个（8点标定类似于汞灯特征谱标定）增加到22个，误差减小明显，将22点二次拟合的结果作为单色仪最终的标定结果。实验结果表明，采用连续光谱光源的单色仪标定方法获得的标定点数更多，标定结果优于传统的采用汞灯的标定方法。
單色儀在加工和安裝過程中不可避免的存在誤差，必鬚對其進行標定後纔能使用。傳統上採用汞燈的標定方法，波長數量有限，限製瞭單色儀的標定精度。在研究光柵單色儀原理的基礎上，提齣瞭一種基于連續光譜光源的單色儀標定方法，設計併搭建瞭標定實驗繫統，繫統由寬波段光源、光源電源、濾光片、單色儀、光譜儀及計算機構成。採用滷鎢燈作為光源，用光譜儀分彆測量滷鎢燈經單色儀後的輻射、直接測量滷鎢燈的輻射，二者相比得到單色儀透過率函數，消除瞭滷鎢燈輻射以及光譜儀響應函數的影響。在刻度盤的某一讀數位置，穫得單色儀透過率函數併進行歸一化，併計算峰值波長，得到一組峰值波長和刻度盤讀數的數據。該方法共採集瞭22組波長數據，用于單色儀的標定。分彆採用8點、14點、18點、22點，採用線性擬閤和二次擬閤，得到瞭單色儀的波長與刻度盤讀數的關繫式。標定點數從8箇（8點標定類似于汞燈特徵譜標定）增加到22箇，誤差減小明顯，將22點二次擬閤的結果作為單色儀最終的標定結果。實驗結果錶明，採用連續光譜光源的單色儀標定方法穫得的標定點數更多，標定結果優于傳統的採用汞燈的標定方法。
단색의재가공화안장과정중불가피면적존재오차，필수대기진행표정후재능사용。전통상채용홍등적표정방법，파장수량유한，한제료단색의적표정정도。재연구광책단색의원리적기출상，제출료일충기우련속광보광원적단색의표정방법，설계병탑건료표정실험계통，계통유관파단광원、광원전원、려광편、단색의、광보의급계산궤구성。채용서오등작위광원，용광보의분별측량서오등경단색의후적복사、직접측량서오등적복사，이자상비득도단색의투과솔함수，소제료서오등복사이급광보의향응함수적영향。재각도반적모일독수위치，획득단색의투과솔함수병진행귀일화，병계산봉치파장，득도일조봉치파장화각도반독수적수거。해방법공채집료22조파장수거，용우단색의적표정。분별채용8점、14점、18점、22점，채용선성의합화이차의합，득도료단색의적파장여각도반독수적관계식。표정점수종8개（8점표정유사우홍등특정보표정）증가도22개，오차감소명현，장22점이차의합적결과작위단색의최종적표정결과。실험결과표명，채용련속광보광원적단색의표정방법획득적표정점수경다，표정결과우우전통적채용홍등적표정방법。
For the inevitable errors of the monochromator in the process of producing and installing ,it must be calibrated before being used .For the traditional calibration method using mercury lamp ,the number of wavelengths limits the calibration precision of the monochromator .Based on the principle of grating monochromator ,calibration method for the monochromator based on continuous spectrum light source is proposed .Calibration system is designed and built ,which is composed of broadband light source using tungsten halogen lamp ,power source ,light filter ,the monochromator ,spectroscopy to detect the intensity of the monochromator output ,and computer .Divide the intensity detected on the output of monochromator by the intensity detected directly the tungsten halogen lamp .The result is the transmissivity function of the monochromator eliminating the influence of the halogen tungsten lamp radiation and the spectrometer response function .On a certain dial number ,the transmissivity func‐tion is measured ,normalized and the peak wavelength is calculated .22 groups of wavelength data and dial number are acquired . 8 ,14 ,18 ,22 points are chosen separately to calibrate the relationship between the wavelength and the dial number of mono‐chromator by linear fitting and quadratic fitting .Experimental results show the calibration result in 22 points is better than oth‐ers ,(8 points similar to the calibration method using mercury lamp) .The result of quadratic fitting with 22 points as the finalre‐sult is better than linear fitting .So the calibration method for monochromator using the continuous spectrum light source with more calibration points is superior to the traditional calibration method using mercury lamp .
