Static Fourier-transform spectrometer based on Wollaston prism

Lin, Xuling; Zhou, Feng; Li, Huan; Zhao, Haibo

doi:10.1016/j.ijleo.2014.01.062

Cited by 7 publications

(3 citation statements)

References 7 publications

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“…A two-output steppingmode interferometer has been proposed by Mandon [19], where laser frequency combs are used as light sources for FT spectroscopy, increasing sensitivity by several orders of magnitude: here, two fast InGaAs detectors measure the interferogram as a function of the optical path difference between the interferometer arms. Alternatively, static FT spectrometers have been demonstrated [20,21], in which a Wollaston prism (WP) between crossed polarizers introduces a delay between orthogonal polarizations which varies along the transverse coordinate: by imaging such transverse profile on a CCD camera, one obtains interference fringes in the spatial rather than in the temporal domain, resulting in an inherently stable single-shot interferogram with no moving parts. A further implementation concerning a multichannel FT spectrometer which employs a WP is reported in [22].…”

Section: Introductionmentioning

confidence: 99%

Scanning Fourier transform spectrometer in the visible range based on birefringent wedges

et al. 2016

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We introduce a spectrometer capable of measuring sample absorption spectra in the visible regime, based on a time-domain scanning Fourier transform (FT) approach. While infrared FT spectrometers typically employ a Michelson interferometer to create the two delayed light replicas, the proposed apparatus exploits a compact common-mode passive interferometer that relies on the use of birefringent wedges. This ensures excellent path-length stability (∼λ/300) and accuracy, with no need for active feedback or beam tracking. We demonstrate the robustness of the technique measuring the transmission spectrum of a colored bandpass filter over one octave of bandwidth and compare the results with those obtained with a commercial spectrophotometer.

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Section: Introductionmentioning

confidence: 99%

Scanning Fourier transform spectrometer in the visible range based on birefringent wedges

et al. 2016

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“…There were seven characteristic absorption peaks that could be found at 3450 cm -1 , 3200 cm -1 , 2950 cm -1 , 1610 cm -1 , 1450 cm -1 , 1150 cm -1 and 650 cm -1 . According to the characteristics of organic functional groups of coal structure [31,32] , the whole spectra (4000-500 cm -1 ) were divided into a, b, c and d four sections, which absorption peaks respectively were -X-H (a: 3600-3000 cm -1 , X=O, S or N), aliphatic hydrocarbon (b, 3000-2700 cm -1 ), oxygen-containing functional groups (c, 1800-1000 cm -1 ) and aromatic hydrocarbon (d, 900-700 cm -1 ). First, seven absorption peaks were qualitatively analyzed: The absorption peaks of 3450 cm -1 and 3200 cm -1 were the stretching vibration of -OH, which maybe came from phenols, alcohols and/or carboxylic acids.…”

Section: Fig4 Yields Of Pyrolysis Products With or Without Catalystsmentioning

confidence: 99%

Metal Sulfide Assisted Coal Catalytic Hydrogenated Microwave Pyrolysis

Liu

Yue

2020

MSF

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The efficient cleaning conversion of coal is more and more attracted due to resource exhaustion and environmental pollution. To improve the yield and quality of products of coal pyrolysis, the catalytic hydrogenated microwave pyrolysis was introduced, and the effects of metal sulfide on hydrogenated microwave pyrolysis were focused on discuss via the detection methods of proximate and ultimate analyses, SEM-EDS, FT-IR and GC-MS in this work. The results shown that because of the “hot-spot” effect and the characteristics of electromagnetic loss of metal sulfide, the temperature-rising rates with catalysts were obviously higher, but the final pyrolysis temperatures with or without catalyst were almost close. Higher temperature-rising rate with catalysts made the yield of liquid product more, which the yields of liquid product with MoS2 and FeS2 catalyst were 28.4 wt.% and 27.1 wt.%. The carbon distributions indicated that carbon in solid and gaseous products transferred into liquid product, when the catalysts added into pyrolysis reactions. The quality of tar with catalyst was improved, and the component content of light oil, intermedium oil and heavy oil were 67.55 wt.%, 27.98 wt.% and 4.47 wt.% for MoS2 catalyst, in which the content of light oil increased by 10.30 times than that without catalyst. The thermal effect and catalysis of metal metal sulfide made complex aromatic compounds more thorough cracking, improved the amount and active of free hydrogen. Actived free hydrogen further enhanced cracking of heavy oil, resulting in the content of hydrogen in gaseous with catalysts decrease, and the content of light oil increased.

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“…The replicas are then projected back to a common polarization state, to allow their interference on the detector. Birefringent interferometers, originally developed for astronomical applications [10,11], have been used in a variety of configurations, both dynamical and static [12,13], as well as in imaging modality [14,15].…”

Section: Introductionmentioning

confidence: 99%

Fourier transform spectroscopy in the vibrational fingerprint region with a birefringent interferometer

et al. 2017

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Abstract:We introduce a birefringent interferometer for Fourier transform (FT) spectroscopy in the mid-infrared, covering the vibrational fingerprint region (5-10 µm, 1000-2000 cm −1 ), which is crucial for molecular identification. Our interferometer employs the crystal calomel (Hg 2 Cl 2 ), which combines high birefringence (n e -n o ≈0.55) with a broad transparency range (0.38-20 µm). We adopt a design based on birefringent wedges, which is simple and compact and guarantees excellent delay accuracy and long-term stability. We demonstrate FTIR spectroscopy, with a frequency resolution of 3 cm −1 , as well as two-dimensional IR (2DIR) spectroscopy. Our setup can be extended to other spectroscopic modalities such as vibrational circular dichroism and step-scan FT spectroscopy. Express 23(12), 16449-16465 (2015).

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Static Fourier-transform spectrometer based on Wollaston prism

Cited by 7 publications

References 7 publications

Scanning Fourier transform spectrometer in the visible range based on birefringent wedges

Scanning Fourier transform spectrometer in the visible range based on birefringent wedges

Metal Sulfide Assisted Coal Catalytic Hydrogenated Microwave Pyrolysis

Fourier transform spectroscopy in the vibrational fingerprint region with a birefringent interferometer

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