Standoff spatial heterodyne Raman spectrometer for mineralogical analysis

Egan, Miles J.; Angel, S. M.; Sharma, Shiv K.

doi:10.1002/jrs.5121

Cited by 24 publications

(20 citation statements)

References 26 publications

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“…Interferograms are measured in 30-ns gate exposures, which permit the acquisition of interference patterns generated by the Raman scattered light yet severely limit the contribution of ambient light to the resulting image. Finally, the Raman spectrum is recovered after applying several steps as described in a previous paper [18] , including apodization of the interferogram, application of the FT upon the interferogram, phase correction of the FT by Mertz's method [22] , intensity calibration by modeling the wavenumber-dependent intensity distribution of the shot noise, and windowing the regions of the FT that contain Raman peaks.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…The crossed wavefronts, which represent a superposition of spatial interference fringes, are converted to a spectrum upon applying a Fourier transform (FT). Since Harlander's pioneering work, SHS has been used for many applications, including the measurement of emission spectra and wind velocities in gas clouds [7][8][9][10] ; measurement of Raman spectra [11][12][13][14][15][16][17][18] of organics, inorganic salts, and minerals; and laser-induced breakdown spectroscopy [19] of brass alloys.…”

Section: Introductionmentioning

confidence: 99%

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One‐mirror, one‐grating spatial heterodyne spectrometer for remote‐sensing Raman spectroscopy

Egan

Acosta-Maeda

Angel

et al. 2020

J Raman Spectroscopy

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Recently, we evaluated a new type of Fourier transform Raman spectrometer, the spatial heterodyne Raman spectrometer (SHRS), which provides high‐resolution Raman spectra without the need for an entrance slit. An SHRS is a variant of a Michelson interferometer in which the mirrors in the arms of a Michelson interferometer are replaced by two stationary diffraction gratings. Instead of sampling path length differences temporally, as in the case of a Michelson interferometer, SHRS samples path length differences spatially at a two‐dimensional array detector. Applying a Fourier transform to the resulting interferogram recovers the desired spectrum. In the modified SHRS (mSHRS) instrument used in the present work, one of the diffraction gratings has been replaced by a stationary λ/10 mirror. This modification has a few effects. First, the detector records a greater number of photons, as spectral light is not lost into unused diffraction orders in the mirror arm of mSHRS. Second, the free spectral range (wavelength coverage) is doubled, whereas the spectral resolution is cut in half. In this work, the authors present remote‐sensing Raman spectra of minerals, organics, and biomarkers using this mSHRS for the first time.

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Section: Experimental Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

One‐mirror, one‐grating spatial heterodyne spectrometer for remote‐sensing Raman spectroscopy

Egan

Acosta-Maeda

Angel

et al. 2020

J Raman Spectroscopy

Self Cite

View full text Add to dashboard Cite

show abstract

“…They evaluated a new type of Fourier transform Raman spectrometer, the spatial heterodyne Raman spectrometer that provides high spectral resolution in a compact system without limiting light throughput. In this work, they present time‐resolved Raman spectra of carbonate, sulfate, and silicate minerals, including low Raman scattering efficiency olivine and feldspar minerals . Hu et al presented a spectral restoration method for a spatial heterodyne Raman spectrometer (SHRS).…”

Section: Raman Techniques and Methodsmentioning

confidence: 99%

“…In this work, they present time-resolved Raman spectra of carbonate, sulfate, and silicate minerals, including low Raman scattering efficiency olivine and feldspar minerals. [231] Hu et al presented a spectral restoration method for a spatial heterodyne Raman spectrometer (SHRS). Several research teams have demonstrated the detection ability of SHRS by experiments and theoretical estimation.…”

Section: Instrumentation and Imagingmentioning

confidence: 99%

Recent advances in linear and nonlinear Raman spectroscopy. Part XII

Nafie

2018

J Raman Spectroscopy

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This annual review is an overview of advances in the field of Raman spectroscopy as found in papers published in the previous calendar year in the Journal of Raman Spectroscopy (JRS), as well as in trends over the past decade across journals that have published papers important to the field of Raman spectroscopy. This information is gleaned from statistical data on article counts obtained from the Clarivate Analytic's Web of Science Core Collection by year and by subfield of Raman spectroscopy. Additional information is gleaned from presentations at the XXVI International Conference on Raman Spectroscopy (ICORS 2018) in Jeju Island, Korea in August 2018, and contributions on Raman scattering at SCIX 2018, organized by the Federation of Analytical Chemistry and Spectroscopy Societies (FACSS) in Atlanta, Georgia, USA in October 2018. Coverage is also provided for topics from the European Conference on Nonlinear Optical Spetroscopy (ECONOS 2018) held in April in Milan, Italy and GeoRaman 2018 in Catania, Italy in June. Finally, papers published in JRS in 2017 are highlighted and arranged by topics at the frontier of Raman spectroscopy. On the basis of this survey information, it is clear that Raman spectroscopy continues as in recent years as a rapidly expanding field of research across a wide range of novel disciplines and applications that provide sensitive photonic information of matter at the molecular level.

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“…Usual requirements for the laser are its narrow spectral band (of the order of a small fraction of nm) and the stability of the emitted wavelength, although all those requirements can be relaxed depending on the particular application. Regarding the spectrograph, both dispersive [17] and Fourier transform types [18] are used in the literature. The latter type, particularly in the static heterodyne version, lends to miniaturization without compromising spectral resolution [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

A non-dispersive approach for a Raman gas sensor

2020

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Although Raman spectroscopy is widely used on solids and liquids, its application on gaseous samples is far less commonplace due to technical issues related to dealing with very weak signals over a strong background. A demonstration of a possible approach for a simple, noninvasive Raman-based gas detector is presented and evaluated. This setup is meant to perform nitrogen and oxygen gas concentration measurements through Raman scattering working with optical filters instead of the traditional spectrograph and a lighting-grade 532 nm diode-pumped solid state laser as the pumping source. An industrial-grade CMOS camera is used as the detector, taking full advantage of the low noise and spatial resolution of this device. The system has been tested for both oxygen and nitrogen in a gas flow cell. Nitrogen measurement in a glass vial is reported in order to demonstrate and show some of the advantages that could be obtained with the use of an imaging detector instead of a single pixel one. The reported measurements show that even without using a dispersion spectrometer, this approach enables an indicative, noninvasive gas detection through glass vials with significant rejection of the elastic scattering contribution.

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Standoff spatial heterodyne Raman spectrometer for mineralogical analysis

Cited by 24 publications

References 26 publications

One‐mirror, one‐grating spatial heterodyne spectrometer for remote‐sensing Raman spectroscopy

One‐mirror, one‐grating spatial heterodyne spectrometer for remote‐sensing Raman spectroscopy

Recent advances in linear and nonlinear Raman spectroscopy. Part XII

A non-dispersive approach for a Raman gas sensor

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