光谱仪测量窄带宽光源光谱分布的七点修正法

发布时间：2018-01-13 05:13

本文关键词：光谱仪测量窄带宽光源光谱分布的七点修正法　出处：《光谱学与光谱分析》2016年06期 　论文类型：期刊论文

【摘要】：针对光谱仪在测量窄带宽光源的光谱分布时出现的光谱变形现象,提出了一种带宽修正方法—七点修正方法。首先,利用泰勒级数和相关的导数公式,得到了七点修正公式的数学解析式;其次,用光谱线型为正弦函数的模拟光谱对七点修正法进行验证,采用正弦函数来模拟真实光谱,通过光谱仪的带宽函数计算出测量值,然后应用七点修正公式,对测量值进行修正;最后利用中心波长为365nm的LED光源对七点修正法进行了实验验证,用双光栅单色仪来测量LED光源的光谱辐射照度,光谱仪带宽分别选为5与0.5nm,将七点修正公式应用于测量值,得到修正值。模拟结果表明:在选定的模拟条件下,修正后得到的中心波长处的峰值可以达到真实值的99%以上;实验结果表明:修正后中心波长处的峰值可以达到真实值的95%以上。由模拟结果和实验结果可知,七点修正法与三点修正法和五点修正法相比,修正效果有明显提升,这种带宽修正方法可以广泛应用在光谱测量领域。
[Abstract]:Aiming at the spectral distortion phenomenon of the spectrometer in measuring the spectral distribution of the narrow band light source, a bandwidth correction method, the seven point correction method, is proposed. Firstly, the Taylor series and the related derivative formula are used. The mathematical analytical formula of the seven-point correction formula is obtained. Secondly, the seven-point correction method is verified by the simulated spectrum with the sine function of the spectral line. The real spectrum is simulated by the sine function, and the measured value is calculated by the bandwidth function of the spectrometer. Then the seven point correction formula is used to correct the measured value. Finally, the seven-point correction method is verified by using the LED light source with the center wavelength of 365nm. The spectral illuminance of the LED light source is measured by a double grating Monochromator. The bandwidth of the spectrometer is chosen as 5 and 0.5 nm respectively. The seven-point correction formula is applied to the measured value and the revised value is obtained. The simulation results show that: under the selected simulation conditions. The corrected peak value of the center wavelength can reach more than 99% of the true value. The experimental results show that the peak value of the corrected center wavelength can reach more than 95% of the true value. From the simulation results and experimental results, the seven-point correction method is compared with the three-point correction method and the five-point correction method. The effect of the correction is improved obviously, and this bandwidth correction method can be widely used in the field of spectral measurement.
【作者单位】：中国计量科学研究院光学与激光计量科学研究所;北京理工大学光电学院;
【基金】：中国博士后科学基金项目(2014M550788) 国家自然科学基金项目(41305140)资助
【分类号】：TH744.1
【正文快照】： 引言光谱测量在辐射度学领域应用广泛[1-3]。而如何将窄带宽的光谱测量准确一直是一个难题。通过原子滤光器,在实验上实现了带宽接近于自然线宽的超窄线宽光谱[4-5]。可以通过使用带宽足够窄的扫描式光谱仪将窄带宽光源的光谱测量准确,扫描式光谱仪是通过改变入射狭缝和出射狭

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