Mukherjee Ashutosh, Lorenz Anita, Brecht Marc
Center for Process Analysis and Technology (PA&T), School of Applied Chemistry, 64332Reutlingen University, Reutlingen, Germany.
Reutlingen Research Institute (RRI), 64332Reutlingen University, Reutlingen, Germany.
Appl Spectrosc. 2022 Feb;76(2):199-206. doi: 10.1177/00037028211055148. Epub 2021 Oct 29.
A lens-based Raman spectrometer is characterized by studying the optical elements in the optical path and we study the measure of aberration-diffraction effects. This is achieved by measuring the spectral resolution (SR) thus encompassing almost all optical elements of a spectrometer that are mostly responsible for such effects. An equation for SR is used to determine the quality factor which measures aberration/diffraction effects occurring in a spectrometer. We show how the quality factor changes with different spectrometer parameters such as grating groove density, the wavelength of excitation, pinhole width, charge-coupled device (CCD) pixel density, etc. This work provides an insight into the quality of a spectrometer and helps to monitor the performance of the spectrometer over a certain period. Commercially available spectrometers or home-built spectrometers are prone to misalignment in optical elements and can benefit from this work that allows maintaining the overall quality of the setup. Performing such experiments over a period helps to minimize the aberration/diffraction effects occurring as a result of time and maintaining the quality of measurements.
基于透镜的拉曼光谱仪通过研究光路中的光学元件来表征，并且我们研究像差 - 衍射效应的测量。这是通过测量光谱分辨率（SR）来实现的，从而涵盖了光谱仪中几乎所有对这些效应起主要作用的光学元件。使用一个关于SR的方程来确定质量因子，该质量因子用于衡量光谱仪中发生的像差/衍射效应。我们展示了质量因子如何随不同的光谱仪参数变化，如光栅槽密度、激发波长、针孔宽度、电荷耦合器件（CCD）像素密度等。这项工作有助于深入了解光谱仪的质量，并有助于在一定时期内监测光谱仪的性能。市售光谱仪或自制光谱仪在光学元件方面容易出现未对准的情况，并且可以从这项工作中受益，该工作有助于维持装置的整体质量。在一段时间内进行此类实验有助于最小化由于时间导致的像差/衍射效应，并维持测量质量。
