Limits...
Comparison of Low Cost Miniature Spectrometers for Volcanic SO(2) Emission Measurements.

Kantzas EP, McGonigle AJ, Bryant RG - Sensors (Basel) (2009)

Bottom Line: The dominantly applied unit has recently been discontinued however, raising the question of which currently available devices should now be implemented.In this paper, we consider, and make recommendations on this matter, by studying a number of inexpensive compact spectrometers in respect of measurement performance and thermal behaviour.Of the studied units, the Avaspec demonstrated the best prospects for the highest time resolution applications, but in the majority of cases, we anticipate users likely preferring the less bulky USB2000+s.

View Article: PubMed Central - PubMed

Affiliation: Department of Geography, University of Sheffield, Sheffield, S10 2TN, UK, E-Mails: ggp07epk@shef.ac.uk (E. P. K.); a.mcgonigle@shef.ac.uk (A. J. S. M.); r.g.bryant@shef.ac.uk (R. G. B.).

ABSTRACT
Miniature ultraviolet USB coupled spectrometers have become ubiquitously applied over the last decade for making volcanic SO(2) emission rate measurements. The dominantly applied unit has recently been discontinued however, raising the question of which currently available devices should now be implemented. In this paper, we consider, and make recommendations on this matter, by studying a number of inexpensive compact spectrometers in respect of measurement performance and thermal behaviour. Of the studied units, the Avaspec demonstrated the best prospects for the highest time resolution applications, but in the majority of cases, we anticipate users likely preferring the less bulky USB2000+s.

No MeSH data available.


Related in: MedlinePlus

Skylight spectra for simultaneous identical exposure time (170 ms) acquisitions from the Avaspec, USB4000 and a typical USB2000/2000+ spectrometer (USB2+E001).
© Copyright Policy
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC3297134&req=5

f2-sensors-09-03256: Skylight spectra for simultaneous identical exposure time (170 ms) acquisitions from the Avaspec, USB4000 and a typical USB2000/2000+ spectrometer (USB2+E001).

Mentions: In order to characterise these phenomena, in respect of our application, we made a series of skylight spectral observations, on February 28th 2008 in Sheffield, under stable intensity clear sky conditions, by coupling the spectrometers via optical fibres (Avantes FCRL-4UV200-2-SR) to co-aligned, home made, single plano-convex f = 100 mm lens, vertically pointing telescopes. Sample 170 ms exposure time spectra for the Avaspec, USB4000 and one USB2000+ are shown in Figure 2, the latter as a representative of the rather similar performance of all the USB2000/2000+ units. The Avaspec displayed higher sensitivity in the ≈ 310-325 nm spectral region, used for the SO2 measurement, than the OO devices, with the USB2000/USB2000+s returning around double the signal of the USB4000. This is likely caused, to a large extent, by: 1) the fundamentally higher resolution of the Avaspec optical bench, which allows use of a diffraction grating of fewer lines/mm to realize the desired ≈ 0.65 nm resolution, so providing enhanced light throughput characteristics; and 2) the splitting of the incident light into 3648 pixel increments, in the case of the USB4000's detector, each of correspondingly lower intensity than captured by the other units' 2048 element detectors. These sensitivity data are further illustrated in Table 1, which shows the light signals recorded at 320 nm from each spectrometer. Note that due to the relatively low cost of these units, the performance in each evaluation, per spectrometer type, though broadly similar, would not be expected to be absolutely identical.


Comparison of Low Cost Miniature Spectrometers for Volcanic SO(2) Emission Measurements.

Kantzas EP, McGonigle AJ, Bryant RG - Sensors (Basel) (2009)

Skylight spectra for simultaneous identical exposure time (170 ms) acquisitions from the Avaspec, USB4000 and a typical USB2000/2000+ spectrometer (USB2+E001).
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3297134&req=5

f2-sensors-09-03256: Skylight spectra for simultaneous identical exposure time (170 ms) acquisitions from the Avaspec, USB4000 and a typical USB2000/2000+ spectrometer (USB2+E001).
Mentions: In order to characterise these phenomena, in respect of our application, we made a series of skylight spectral observations, on February 28th 2008 in Sheffield, under stable intensity clear sky conditions, by coupling the spectrometers via optical fibres (Avantes FCRL-4UV200-2-SR) to co-aligned, home made, single plano-convex f = 100 mm lens, vertically pointing telescopes. Sample 170 ms exposure time spectra for the Avaspec, USB4000 and one USB2000+ are shown in Figure 2, the latter as a representative of the rather similar performance of all the USB2000/2000+ units. The Avaspec displayed higher sensitivity in the ≈ 310-325 nm spectral region, used for the SO2 measurement, than the OO devices, with the USB2000/USB2000+s returning around double the signal of the USB4000. This is likely caused, to a large extent, by: 1) the fundamentally higher resolution of the Avaspec optical bench, which allows use of a diffraction grating of fewer lines/mm to realize the desired ≈ 0.65 nm resolution, so providing enhanced light throughput characteristics; and 2) the splitting of the incident light into 3648 pixel increments, in the case of the USB4000's detector, each of correspondingly lower intensity than captured by the other units' 2048 element detectors. These sensitivity data are further illustrated in Table 1, which shows the light signals recorded at 320 nm from each spectrometer. Note that due to the relatively low cost of these units, the performance in each evaluation, per spectrometer type, though broadly similar, would not be expected to be absolutely identical.

Bottom Line: The dominantly applied unit has recently been discontinued however, raising the question of which currently available devices should now be implemented.In this paper, we consider, and make recommendations on this matter, by studying a number of inexpensive compact spectrometers in respect of measurement performance and thermal behaviour.Of the studied units, the Avaspec demonstrated the best prospects for the highest time resolution applications, but in the majority of cases, we anticipate users likely preferring the less bulky USB2000+s.

View Article: PubMed Central - PubMed

Affiliation: Department of Geography, University of Sheffield, Sheffield, S10 2TN, UK, E-Mails: ggp07epk@shef.ac.uk (E. P. K.); a.mcgonigle@shef.ac.uk (A. J. S. M.); r.g.bryant@shef.ac.uk (R. G. B.).

ABSTRACT
Miniature ultraviolet USB coupled spectrometers have become ubiquitously applied over the last decade for making volcanic SO(2) emission rate measurements. The dominantly applied unit has recently been discontinued however, raising the question of which currently available devices should now be implemented. In this paper, we consider, and make recommendations on this matter, by studying a number of inexpensive compact spectrometers in respect of measurement performance and thermal behaviour. Of the studied units, the Avaspec demonstrated the best prospects for the highest time resolution applications, but in the majority of cases, we anticipate users likely preferring the less bulky USB2000+s.

No MeSH data available.


Related in: MedlinePlus