应用光学, 2019, 40(1): 93, 网络出版: 2019-01-01

单色仪波长定标中狭缝设置的影响分析

Analysis on influence of slit setting in monochromator wavelength calibration
作者单位

1中国科学院安徽光学精密机械研究所 通用光学定标与表征技术重点实验室,安徽 合肥 230031

2中国科学技术大学,安徽 合肥 230031

摘要
单色仪作为一种分光仪器, 在传感器的辐射定标等方面具有重要应用。在实际应用过程中, 其波长和带宽的设置对传感器的精确定标具有重要影响。使用低压汞灯作为波长标准光源, 通过对其特征谱线扫描的方法, 研究了传感器定标过程中, 设置单色仪不同的狭缝宽度, 对传感器精确定标具有重要影响。结果显示, 当出射入射狭缝相同, 同时改变其宽度的情况下, 与典型校准状态(出射入射狭缝宽度设置为0.5 mm)相比, 波长偏差量达到0.17 nm; 当入射狭缝与出射狭缝不一致时, 与典型校准状态相比, 波长偏差量达到0.18 nm; 当光源未充满入射狭缝与充满入射狭缝相比, 最大误差达到0.02 nm, 该影响几乎可以忽略。在相关的传感器光谱辐射定标实验研究中, 单色仪的定标精度和准确性评估等方面具有重要应用。
Abstract
As a kind of spectroscopic instrument, the monochromator has important applications in radiation calibration of sensors. In the actual application process, the setting of wavelength and bandwidth has an important influence on the precise calibration of the sensor.The low-pressure mercury lamp is used as the wavelength standard light source. Through the method of characteristic line scanning, it is studied that in the process of sensor calibration, it has an important influence on the precise calibration of the sensor under different slit widths of the monochromator. The results show that when the exit pupil is the same and the width is changed at the same time, the maximum deviation of the wavelength is 0.17 nm compared with the typical calibration state (the exit slit width is set to 0.5 mm); when the incident slit is inconsistent with the exit slit, the maximum wavelength deviation is 0.18 nm compared to the typical calibration state; when the light source is not filled with the entrance slit and the full aperture is filled, the maximum error is 0.02 nm, and the effect is almost negligible. In the related experimental study of sensor spectral radiometric calibration, the calibration accuracy and accuracy evaluation of monochromator have important applications.
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