Background-free broadband absorption spectroscopy based on interferometric suppression with a sign-inverted waveform

Tomberg, Teemu; Muraviev, Andrey; Ru, Qitian; Vodopyanov, Konstantin L.

doi:10.1364/optica.6.000147

Cited by 23 publications

(12 citation statements)

References 19 publications

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“…However, the magnitude of the free induction decay signal is still related to the intensity of the excitation pulse [23] and therefore must be accounted for in a quantitative fit to extract gas properties. As a notable exception, Tomberg et al [25] demonstrated a quantitative, baseline-free technique for broadband absorption spectroscopy by interferometrically canceling the portion of the signal that depends on the source intensity in the time-domain. In this technique, light from the spectrometer that has passed through a gas sample is interfered with light from a reference channel that has been sign-inverted in a Michelson interferometer [26][27][28][29][30].…”

Section: Existing Methods For Baseline Normalizationmentioning

confidence: 99%

Baseline-free quantitative absorption spectroscopy based on cepstral analysis

Cole¹,

Makowiecki²,

Hoghooghi³

et al. 2019

Opt. Express

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The accuracy of quantitative absorption spectroscopy depends on correctly distinguishing molecular absorption signatures in a measured transmission spectrum from the varying intensity or 'baseline' of the light source. Baseline correction becomes particularly difficult when the measurement involves complex, broadly absorbing molecules or non-ideal transmission effects such as etalons. We demonstrate a technique that eliminates the need to account for the laser intensity in absorption spectroscopy by converting the measured transmission spectrum of a gas sample to a modified form of the time-domain molecular free induction decay (m-FID) using a cepstral analysis technique developed for audio signal processing. Much of the m-FID signal is temporally separated from and independent of the source intensity, and this portion can be fit directly with a model to determine sample gas properties without correcting for the light source intensity. We validate the new approach in several complex absorption spectroscopy scenarios and discuss its limitations. The technique is applicable to spectra obtained with any absorption spectrometer and provides a fast and accurate approach for analyzing complex spectra. AbstractThis document provides supplementary material for "Baseline-free Quantitative Absorption Spectroscopy Based on Cepstral Analysis." Here, we include further details of the spectral model used to fit the broadband spectrum of ethane and methane. We also compare the two sources of absorption cross section data used to generate and fit a simulated spectrum of four broadly absorbing compounds in the mid-infrared. We give a full table of fit results for the simulated MIR spectrum to accompany an abbreviated version in the full text.

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Section: Existing Methods For Baseline Normalizationmentioning

confidence: 99%

Baseline-free quantitative absorption spectroscopy based on cepstral analysis

Cole¹,

Makowiecki²,

Hoghooghi³

et al. 2019

Opt. Express

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“…We find that RMSE is proportional to (compression rate) 0.93 by least squares fitting. To show the compression capability of C-DCS for denser molecular lines, we demonstrate massively parallel spectroscopy of 10 trace gas species, which resembles to the previously reported experiment [18]. We assume a 76-m-long multi-pass gas cell filled with nitrous oxide ( and a buffer gas.…”

Section: Fig1 a Conceptual Illustration Of Compressive Dual-comb Spec...mentioning

confidence: 79%

“…It can be implemented either by a hardware instrumentation or a post numerical processing. For the hardware instrumentation, a Michelson-type interferometer is added so as to make the 𝜋 phase difference between the pulses from the two arms due to the reflection of the beam splitter, realizing the background subtraction due to the destructive interference on the detector [18]. On the other hand, for the post numerical processing of background subtraction, a reference background interferogram can be obtained either by an additional measurement [19] or a numerical baseline reconstruction [4].…”

Section: Fig1 a Conceptual Illustration Of Compressive Dual-comb Spec...mentioning

confidence: 99%

Compressive dual-comb spectroscopy

Kawai

Kageyama

Horisaki

et al. 2021

Sci Rep

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Broadband, high resolution, and rapid measurements of dual-comb spectroscopy (DCS) generate a large amount of data stream. We numerically demonstrate significant data compression of DCS spectra by using a compressive sensing technique. Our numerical simulation shows a compression rate of more than 100 with a 3% error in mole fraction estimation of mid-infrared (MIR) DCS of two molecular species in a broadband (~ 30 THz) and high resolution (~ 115 MHz) condition. We also numerically demonstrate a massively parallel MIR DCS spectrum of 10 different molecular species can be reconstructed with a compression rate of 10.5 with a transmittance error of 0.003 from the original spectrum.

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“…The strongest line of the Q Q(4 4,1 ) transition is measured with |ΔA| = 0.25 (|Δϕ| = 0.12 rad). The 1-σ sensitivity 37,39 of ΔA is 1.31×10 −4 , and the 1-σ sensitivity of Δϕ is 0.60×10 − 4 rad. Figure 4c and 4d show the series lines of the Q Q(K a =4) subbranch in the υ 1 +υ 3 band.…”

Section: Resultsmentioning

confidence: 98%

Dual-comb optical activity spectroscopy for the analysis of vibrational optical activity induced by external magnetic field

Peng

GU²,

Zuo

et al. 2022

Preprint

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Optical activity (OA) includes the structural information of (bio) molecular and chemical systems, which is widely utilized in the fields of molecular chirality, pharmaceutics and analytical chemistry. Vibrational circular dichroism (VCD) and optical rotatory dispersion (ORD), spectral measurements of absorption and dispersion induced by OA, are powerful tools and characterize molecular chirality, explore the stereo-specific structure and study the solution-state conformation of biological molecules. In terms of the OA analysis of molecules, detection sensitivity, spectral resolution and acquisition speed are the key indicators that have been pursued. In this paper, we show the unmatched potential of dual-comb spectroscopy (DCS) in magnetic optical activity spectroscopy (MOAS) of gas-phase molecules with the resolution of hundred-MHz level and the high-speed measurement of sub-millisecond level. As a demonstration, we directly achieved the rapid, high-precision and high-resolution MOAS measurement of the nitrogen dioxide υ1 + υ3 band and the nitric oxide overtone band, which can be used to analyze fine structure of molecules. The novel approach of dual-comb optical activity spectroscopy (DC-OAS) paves the way for OA to become a routine approach for rapid characterization of the structural conformations of multiphase systems.

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Background-free broadband absorption spectroscopy based on interferometric suppression with a sign-inverted waveform

Cited by 23 publications

References 19 publications

Baseline-free quantitative absorption spectroscopy based on cepstral analysis

Baseline-free quantitative absorption spectroscopy based on cepstral analysis

Compressive dual-comb spectroscopy

Dual-comb optical activity spectroscopy for the analysis of vibrational optical activity induced by external magnetic field

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