OCT Daily Mar 10, 2017

Curated paper

Accurate wavelength calibration method for compact CCD spectrometer

Abstract:

Wavelength calibration is an important step in charge-coupled device (CCD) spectrometers. In this paper, an accurate calibration method is proposed. A model of a line profile spectrum is built at the beginning, followed by noise reduction, bandwidth correction, and automatic peak-seeking treatment. Experimental tests are conducted on the USB4000 spectrometer with a mercury-argon calibration light source. Compared with the traditional method, the results show that this wavelength calibration procedure obtains higher accuracy and the deviations are within 0.1 nm.

简评

这是一篇关于利用自动选择光谱OCT峰值信号,进行光谱标定的文章。没有太多新意,比较实用的算法文章。

内核分成三部分:

  1. 噪声分析与消噪算法
  2. 校正带宽
  3. 自动识别峰值信号

噪声(read out noise/dark noise/photoelectron noise/fixed pattern noise)消噪算法(平均算法,小波阈值算法)。

校正带宽用{Woolliams, 2011 #512}提出的差分算法1

自动识别峰值信号。方法一:将离散信号当作连续曲线,通过使用数值微分公式来计算每个点的导数。峰中心的位置是一阶导数的过零点的对应像素数。

What I can learn from

三种自动识别峰值的方法,目前我确实是手动选择,但仅仅一次就足够,如果自动识别,可能还是要筛选前后区域来重复。该文章仅仅提供一种可能性,

  1. Woolliams, E. R., Baribeau, R., Bialek, A. & Cox, M. G. Spectrometer bandwidth correction for generalized bandpass functions. Metrologia 48, 164 (2011).

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