Zhou Hao, Zhao Weixiong, Cui Weihua, Lv Bingxuan, Fang Bo, Yang Nana, Xiang Guangfeng, Zhang Weijun, Deng Lunhua, Chen Weidong
Laboratory of Atmospheric Physico-Chemistry, Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China.
University of Science and Technology of China, Hefei 230026, China.
Analyst. 2024 Nov 4;149(22):5455-5462. doi: 10.1039/d4an00965g.
The virtually imaged phased array (VIPA) spectrometer uses the orthogonal dispersion method and has the advantages of compact structure, high spectral resolution, and wide wavelength coverage. It has been widely used in different fields. However, due to the non-linear dispersion of the VIPA etalon and the cross-dispersion structure of the VIPA spectrometer, simple and high-accuracy wavelength calibration remains a challenge. In this paper, a new and simple five-parameter spectrogram model is developed by simplifying the phase-matching equation of the VIPA etalon and considering the angle between the camera and dispersion direction, which can achieve a frequency accuracy better than one pixel. The performance of the model is demonstrated by measuring the CO absorption spectrum in the range of 1.42 to 1.45 μm using a self-designed near-infrared VIPA spectrometer . The reported method is simple and easy to solve with high accuracy, which is conducive to promoting the application of VIPA spectrometers in precision measurement.
虚拟成像相控阵（VIPA）光谱仪采用正交色散方法，具有结构紧凑、光谱分辨率高和波长覆盖范围广等优点。它已在不同领域得到广泛应用。然而，由于VIPA标准具的非线性色散以及VIPA光谱仪的交叉色散结构，简单且高精度的波长校准仍然是一个挑战。本文通过简化VIPA标准具的相位匹配方程并考虑相机与色散方向之间的夹角，建立了一种新的、简单的五参数光谱图模型，该模型可实现优于一个像素的频率精度。使用自行设计的近红外VIPA光谱仪测量1.42至1.45μm范围内的CO吸收光谱，验证了该模型的性能。所报道的方法简单易解且精度高，有利于推动VIPA光谱仪在精密测量中的应用。
