摘要
单色仪在实际光谱测量前需要进行波长校准。文中分析了波长驱动原理,并推导了Cz-erny-Turner双光栅单色仪出射波长与步进电机脉冲数的关系式。在此基础上进行了波长校准实验。使用低压汞灯作为校准光源,在紫外波段和可见波段蓝端,扫描多条低压汞灯特征谱线,得到单色仪的指示波长与信号强度的关系数据。计算出单色仪出射这些谱线时使用的波长修正量。最后使用曲线拟合方法得到250nm～450nm光谱范围内单色仪出射任意波长时对应修正量的计算式。波长校准保证了单色仪的波长准确性。
Wavelength calibration needs to be done before the spectral measurement of a mono- chromator. The relationship between the output wavelength and the number of stepping motor pulses of Czerny-Turner double grating monochromator was derived. Experiments of wave- length calibration were carried out. A low pressure mercury lamp was used to provide charac- teristic calibration lines at ultraviolet and visible wavelength range, spectrum scanning was done by the monochromator to get the data of signal intensity versus indicated wavelength. Fi- nite wavelength correction was computed from the data. Then correction at arbitrary output wavelength ranging from 250nm to 450 nm could be obtained using curve fitting. The wave- length calibration insured the accuracy of the monochromator wavelength.
出处
《应用光学》
CAS
CSCD
北大核心
2012年第6期1105-1108,共4页
Journal of Applied Optics
