High‐Speed Fourier‐Transform Infrared Spectroscopy with Phase‐Controlled Delay Line,Laser & Photonics Reviews

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High‐Speed Fourier‐Transform Infrared Spectroscopy with Phase‐Controlled Delay Line
Laser & Photonics Reviews ( IF 9.8 ) Pub Date : 2020-12-01 , DOI: 10.1002/lpor.202000374
Kazuki Hashimoto ₁ , Venkata Ramaiah Badarla ₁ , Takuro Ideguchi _{1,

2}

Affiliation

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.

中文翻译：

具有相位控制延迟线的高速傅立叶变换红外光谱

傅里叶变换红外光谱（FTIR）是通过光学编码的振动信号进行中红外（MIR）分子光谱分析的黄金标准。迈克尔逊型FTIR和MIR双梳状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种分子种类。但是，由于时间分辨率低，这不适用于高速测量，而时间分辨率从根本上受到信噪比（SNR）的限制。在这项研究中，开发了一种称为相控傅立叶变换红外光谱（PC-FTIR）的高速FTIR光谱技术，该技术能够以高于10 kHz的速率测量MIR吸收光谱。PC‐FTIR通过任意调节仪器的光谱分辨率，展示了针对各种光谱带宽的高扫描速率和高SNR。作为原理证明，两种液体的高速混合动力学以24 kHz的速率进行测量。气相分子的MIR光谱也以12 kHz的速率以更高的光谱分辨率进行测量。这种高速MIR光谱仪可特别用于测量非重复性快速现象并在短时间内获取大量光谱数据。

更新日期：2021-01-08

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