Doppler-broadened NICE-OHMS beyond the cavity-limited weak absorption condition – II: experimental verification

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Hausmaninger, Thomas,1987-Umeå universitet,Institutionen för fysik (författare)

Doppler-broadened NICE-OHMS beyond the cavity-limited weak absorption condition – II : experimental verification

Artikel/kapitelEngelska2016

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Elsevier,2016
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LIBRIS-ID:oai:DiVA.org:umu-110273
https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-110273URI
https://doi.org/10.1016/j.jqsrt.2015.09.008DOI

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Doppler-broadened (Db) noise-immune cavity-enhanced optical heterodyne molecular spectrometry (NICE-OHMS) is normally described by an expression, here termed the conventional (CONV) description, that is restricted to the conventional cavity-limited weak absorption condition (CCLWA), i.e. when the single pass absorbance is significantly smaller than the empty cavity losses, i.e. when α0L<<π/F. To describe NICE-OHMS signals beyond this limit two simplified extended descriptions (termed the extended locking and extended transmission description, ELET, and the extended locking and full transmission description, ELFT), which are assumed to be valid under the relaxed cavity-limited weak absorption condition (RCLWA), i.e. when α0L<π/Fα0L<π/F, and a full description (denoted FULL), presumed to be valid also when the α0L<π/Fα0L<π/F condition does not hold, have recently been derived in an accompanying work (Ma W, et al. Doppler-broadened NICE-OHMS beyond the cavity-limited weak absorption condition - I. Theoretical Description. J Quant Spectrosc Radiat Transfer, 2015, http://dx.doi.org/10.1016/j.jqsrt.2015.09.007, this issue). The present work constitutes an experimental verification and assessment of the validity of these, performed in the Doppler limit for a set of Fα0L/πFα0L/π values (up to 3.5); it is shown under which conditions the various descriptions are valid. It is concluded that for samples with Fα0L/πFα0L/π up to 0.01, all descriptions replicate the data well. It is shown that the CONV description is adequate and provides accurate assessments of the signal strength (and thereby the analyte concentration) up to Fα0L/πFα0L/π of around 0.1, while the ELET is accurate for Fα0L/πFα0L/π up to around 0.3. The ELFT description mimics the Db NICE-OHMS signal well for Fα0L/πFα0L/π up to around unity, while the FULL description is adequate for all Fα0L/πFα0L/π values investigated. Access to these descriptions both increases considerably the dynamic range of the technique and facilitates calibration using certified reference gases, which thereby significantly broadens the applicability of the Db NICE-OHMS technique.

Ämnesord och genrebeteckningar

NATURVETENSKAP Fysik Atom- och molekylfysik och optik hsv//swe
NATURAL SCIENCES Physical Sciences Atom and Molecular Physics and Optics hsv//eng
NICE OHMS
Frequency modulation spectroscopy
Cavity enhanced spect
Experimental verification

Biuppslag (personer, institutioner, konferenser, titlar ...)

Silander, Isak,1980-Umeå universitet,Institutionen för fysik(Swepub:umu)issi0002 (författare)
Ma, Weiguang,1976-Umeå universitet,Institutionen för fysik,Shanxi University, Taiyuan 030006, China(Swepub:umu)wema0001 (författare)
Axner, Ove,1957-Umeå universitet,Institutionen för fysik(Swepub:umu)ovax0001 (författare)
Umeå universitetInstitutionen för fysik (creator_code:org_t)

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Ingår i:Journal of Quantitative Spectroscopy and Radiative Transfer: Elsevier168, s. 245-2560022-40731879-1352

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Av författaren/redakt...: Hausmaninger, Th ...; Silander, Isak, ...; Ma, Weiguang, 19 ...; Axner, Ove, 1957 ...

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Av lärosätet: Umeå universitet

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