High-Speed Fourier-Transform Infrared Spectroscopy with Phase-Controlled Delay Line
High-Speed Fourier-Transform Infrared Spectroscopy with Phase-Controlled Delay Line
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基于相位控制延迟线的高速傅里叶变换红外光谱技术
DOI：
10.1002/lpor.202000374
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发表时间：
2020-12-01
影响因子：
11
通讯作者：
Ideguchi, Takuro
中科院分区：
文献类型：
--
作者：
Hashimoto, Kazuki;Badarla, Venkata Ramaiah;Ideguchi, Takuro
傅里叶变换红外光谱（FTIR）是通过光学编码振动特征进行中红外（MIR）分子光谱分析的黄金标准。迈克尔逊型FTIR和MIR双梳光谱仪使我们能够通过宽带和高分辨率光谱功能同时研究多个分子物种。然而，这些都不适用于高速测量，由于低的时间分辨率，这是从根本上限制的信噪比（SNR）。在这项研究中，一种高速FTIR光谱技术，称为相位控制傅里叶变换红外光谱（PC-FTIR），具有测量MIR吸收光谱的能力，在10 kHz以上的速率开发。通过任意调节仪器光谱分辨率，PC-FTIR证明了对于各种光谱带宽的高扫描速率和高SNR。作为原理演示的证明，以24 kHz的速率测量两种液体的高速混合动力学。气相分子的MIR光谱也以12 kHz的速率以更高的光谱分辨率测量。这种高速MIR光谱仪特别适用于非重复性快速现象的测量和在短时间内获取大量光谱数据。
Fourier-transform infrared spectroscopy (FTIR) is the golden standard of mid-infrared (MIR) molecular spectroscopic analysis through optically encoded vibrational signatures. Michelson-type FTIR and MIR dual-comb spectrometers allow us to simultaneously investigate multiple molecular species via the broadband and high-resolution spectroscopic capabilities. However, these are not applicable to high-speed measurements due to the low temporal resolution which is fundamentally limited by the signal-to-noise ratio (SNR). In this study, a high-speed FTIR spectroscopy technique called phase-controlled Fourier-transform infrared spectroscopy (PC-FTIR) that has the capability to measure MIR absorption spectra at a rate of above 10 kHz is developed. PC-FTIR demonstrates the high scan rate with a high SNR for various spectral bandwidths by arbitrarily adjusting the instrumental spectral resolution. As a proof of principle demonstration, high-speed mixing dynamics of two liquids is measured at a rate of 24 kHz. MIR spectra of gas-phase molecules are also measured with higher spectral resolution at a rate of 12 kHz. This high-speed MIR spectrometer could be used especially for measuring non-repetitive fast phenomena and acquiring a large amount of spectral data within a short time.