Stand-off Raman spectrometer for identification of liquids in a pressurized gas pipelines

Foster, Michael J.; Storey, Jonathan; Stockwell, Paul; Widdup, David

doi:10.1364/oe.23.003027

Cited by 11 publications

(10 citation statements)

References 5 publications

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“…The basic design and operation of the SHRS has been discussed previously. 1–11,20–41 In the interferometer, collimated light is passed through a 50:50 beam splitter, dividing the beam into two parts which are directed onto tilted diffraction gratings. After being diffracted off the gratings, the beams recombine at the beamsplitter as crossing wave fronts.…”

Section: Resultsmentioning

confidence: 99%

A Monolithic Spatial Heterodyne Raman Spectrometer: Initial Tests

et al. 2020

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Section: Resultsmentioning

confidence: 99%

A Monolithic Spatial Heterodyne Raman Spectrometer: Initial Tests

et al. 2020

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“…For a conventional Czerny Turner dispersive spectrometer, the required width of the slit is given by Eqn :

W_{s} = \frac{δ λ n W_{P}}{R_{S F} normalΔ λ}

where δλ is the target spectral resolution in wavelength, Δ λ is the bandpass of the spectrometer, n is the number of detector pixels, W P is the pixel width and R SF is the resolution factor (assumed to be 1).…”

Section: Methodsmentioning

confidence: 99%

“…For a conventional Czerny Turner dispersive spectrometer, the required width of the slit is given by Eqn (16): [37]…”

Section: Comparison Of Snr Of Shrs With Conventional Dispersive Spectmentioning

confidence: 99%

Raman spectroscopic detection for liquid and solid targets using a spatial heterodyne spectrometer

Guangxiao

Xiong

Shi

et al. 2015

J. Raman Spectrosc.

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Spatial heterodyne Raman spectroscopy (SHRS) is a new type of effective method for the analysis of structure and composition of liquid and solid targets with the characteristics of no moving parts, high spectral resolution, high optical throughput and large field of view. The technique is very suitable for detecting the targets from long distances or under the conditions with ambient light, which is essential for the exploration of planetary surface. In order to have a better understanding of the ability of SHRS for the detection of liquid and solid targets, a breadboard was designed, built and calibrated. Signal to noise was estimated at different integration time or laser power for carbon tetrachloride. Pure materials or materials contained in bottles were both tested. The mixture of organic liquids or inorganic solids were tested. In order to test the detection ability for natural targets, some composition-unknown rocks and pebbles were tested. The results have shown that SHRS can meet the requirements for the detection of weak Raman signal scattered from artificial or natural targets. Standoff detection of sulfur from 5-m or 10-m distance without using any telescope or collimation optics was also tried to test the high optical throughput of SHRS. The potential feasibility of standoff detection has been proved.

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“…The instrument is assembled in a Michelson interferometer configuration with the mirrors replaced by reflective diffraction gratings. [ 21 ] The two wave fronts from the gratings pass through the beam splitter and then interfere to form a fringe pattern in space that can be passed through an FT algorithm to extract the spectral information.…”

Section: Instrumentationmentioning

confidence: 99%