新奇的半参数算法,用于免干扰调谐吸收光谱气体传感(10)
文章出处：如特安防 人气：发表时间：2018-09-02 18:41:23
Acknowledgments
This work was carried out under a Commission for Technology and Innovation CTI grant (17176.1 PFNM-NM).
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Abbreviations
The following abbreviations are used in this manuscript:
TDLAS Tunable Diode Laser Absorption Spectroscopy
FSR Free Spectral Range
CFT Continuous Fourier Transform
DFT Discrete Fourier Transform
RW Rectangular Window
HWHM Half Width at Half Maximum
VCSEL Vertical-cavity surface-emitting laser
Appendix A Approximation of the CFT by the Modified DFT
In this paper, the following definition for the continuous Fourier transform (CFT) is used
Let us first make some assumptions that will simplify the calculations. Let us assume that the function f(x) is zero outside a certain range (−a/2, a/2) with some a ∈ ℝ and a > 0 and let us indicate with m the number of data points at our disposal. For convenience, m is taken to be even. Let us introduce the sampling rate β as
The abscissas of the data xj and kj can be written as:
with j going from −m/2 to m/2. We can approximate Equation (A1) with a Riemann sum using the fact that f(x) is zero outside the range (−a/2, a/2):
where we have approximated the integral with a discrete sum. Clearly, the bigger m is, the better will be the approximation. Now, using Equations (A3) and (A4), we can rewrite (A5) as
Author Contributions
F.V. conceived, designed and performed the experiments; U.M. proposed and developed the algorithm; F.V. and U.M. analyzed the data and wrote the paper.
Conflicts of Interest
The authors declare no conflict of interest.
References
1. Cassidy D.T., Reid J. Atmospheric pressure monitoring of trace gases using tunable diode lasers. Appl. Opt. 1982;21:1185–1190. doi: 10.1364/AO.21.001185.
2. Schiff H.I., Mackay G.I., Bechara J. The use of tunable diode laser absorption spectroscopy for atmospheric measurements. Res. Chem. Intermed. 1994;20:525–556. doi: 10.1163/156856794X00441.
3. Fehér M., Martin P.A. Tunable diode laser monitoring of atmospheric trace gas constituents. Spectrochim. Acta A. 1995;51:1579–1599. doi: 10.1016/0584-8539(95)01401-F.
4. Fried A., Henry B., Wert B., Sewell S., Drummond J.R. Laboratory, ground- based and airborne tunable diode laser systems performance characteristics and applications in atmospheric studies. Appl. Phys. B. 1998;67:317–330. doi: 10.1007/s003400050511.
5. Tuzson B., Henne S., Brunner D., Steinbacher M., Mohn J., Buchmann B., Emmenegger L. Continuous isotopic composition measurements of tropospheric CO2 at Jungfraujoch (3580 m a.s.l.), Switzerland: Real-time observation of regional pollution events. Atmos. Chem. Phys. 2011;11:1685–1696. doi: 10.5194/acp-11-1685-2011.
6. Nikodem M., Wysocki G. Chirped Laser Dispersion Spectroscopy for Remote Open-Path Trace-Gas Sensing. Sensors. 2012;12:16466–16481. doi: 10.3390/s121216466. [PMC free article]
7. McCurdy M.R., Bakhirkin Y., Wysocki G., Lewicki R., Tittel F.K. Recent advances of laser-spectroscopy based techniques for applications in breath analysis. J. Breath Res. 2007;1:014001. doi: 10.1088/1752-7155/1/1/014001.
8. Wang C., Sahay P. Breath Analysis using laser spectroscopic techniques: Breath biomarkers, spectral fingerprints, and detection limits. Sensors. 2009;9:8230–8262. doi: 10.3390/s91008230. [PMC free article]
9. Risby T.H., Tittel F.K. Current status of mid-infrared quantum and interband cascade lasers for clinical breath analysis. Opt. Eng. 2010;49:111123/1-24.
10. Curl R.F., Capasso F., Gmachl C., Kosterev A.A., McManus B., Lewicki R., Pusharsky M., Wysocki G., Tittel F.K. Quantum cascade lasers in chemical physics. Chem. Phys. Lett. 2010;487:1–20. doi: 10.1016/j.cplett.2009.12.073.
11. Linnerud I., Kaspersen P., Jaeger T. Gas monitoring in the process industry using diode laser spectroscopy. Appl. Phys. B. 1998;67:297–305. doi: 10.1007/s003400050509.
12. Lackner M. Tunable diode laser absorption spectroscopy (TDLAS) in the process industries—A review. Rev. Chem. Eng. 2007;23:65–147.
13. Kluczynski P., Jahjah M., Nähle L., Axner O., Belahsene S., Fischer M., Koeth J., Rouillard Y., Westberg J., Vicet A., et al. Detection of acetylene impurities in ethylene and polyethylene manufacturing processes using tunable diode laser spectroscopy in the 3-μm range. Appl. Phys. B. 2011;105:427–434. doi: 10.1007/s00340-011-4645-6.
14. Hodgkinson J., Tatam R.P. Optical gas sensing: A review. Meas. Sci. Technol. 2013;24 doi: 10.1088/0957-0233/24/1/012004.
15. Masiyano D., Hodgkinson J., Schilt S., Tatam R.P. Self-mixing interference effects in tunable diode laser absorption spectroscopy. Appl. Phys. B. 2009;96:863–874. doi: 10.1007/s00340-009-3690-x.
16. Hartmann A., Strzoda R., Schrobenhauser R., Weigel R. Ultra-compact TDLAS humidity measurement cell with advanced signal processing. Appl. Phys. B. 2014;115:263–268. doi: 10.1007/s00340-013-5599-7.
17. Werle P. Accuracy and precision of laser spectrometers for trace gas sensing in the presence of optical fringes and atmospheric turbulence. Appl. Phys. B. 2011;102:313–329. doi: 10.1007/s00340-010-4165-9.
18. Webster C. Brewster-plate spoiler: A novel method for reducing the amplitude of interference fringes that limit tunable-laser absorption sensitivities. J. Opt. Soc. Am. B. 1985;2:1464–1470. doi: 10.1364/JOSAB.2.001464.
19. Silver J.A., Stanton A.C. Optical interference fringe reduction in laser absorption experiments. Appl. Opt. 1988;27:1914–1916. doi: 10.1364/AO.27.001914.
20. Whittaker E.A., Gehrtz M., Bjorklund G. Residual amplitude modulation in laser electro-optic phase modulation. J. Opt. Soc. Am. B. 1985;2:1320–1326. doi: 10.1364/JOSAB.2.001320.
21. Sun H.C., Whittaker E.A. Novel etalon fringe rejection technique for laser absorption spectroscopy. Appl. Opt. 1992;31:4998–5002. doi: 10.1364/AO.31.004998.
22. Goldenstein C.S., Strand C.L., Schultz I.A., Sun K., Jeffries J.B., Hanson R.K. Fitting of calibration-free scanned-wavelength-modulation spectroscopy spectra for determination of gas properties and absorption lineshapes. Appl. Opt. 2014;53:356–367. doi: 10.1364/AO.53.000356.
23. Ehlers P., Johansson A.C., Silander I., Foltynowicz A., Axner O. Use of etalon-immune distances to reduce the influence of background signals in frequency-modulation spectroscopy and noise-immune cavity enhanced optical heterodyne molecular spectroscopy. J. Opt. Soc. Am. B. 2014;31:2934–2945. doi: 10.1364/JOSAB.31.002938.
24. Chen J., Hangauer A., Strzoda R., Amann M.C. Laser spectroscopic oxygen sensor using diffuse reflector based optical cell and advanced signal processing. Appl. Phys. B. 2010;100:417–425. doi: 10.1007/s00340-010-3956-3.
25. Li J., Yu B., Zhao W., Chen W. A review of signal enhancement and noise reduction techniques for tunable diode laser absorption spectroscopy. Appl. Spectrosc. Rev. 2014;49:666–691. doi: 10.1080/05704928.2014.903376.
26. Tenoudji F.C. Analog and Digital Signal Analysis. 1st ed. Springer International Publishing; Cham, Switzerland: 2016. pp. 111–113.
27. Tukey J.W. Spectral Analysis of Time Series. Wiley; New York, NY, USA: 1967. An introduction to the calculations of numerical spectrum analysis; pp. 25–46.
28. Harris F.J. On the use of Windows for Harmonic Analysis with the Discrete Fourier Transform. Proc. IEEE. 1978;66:51–83. doi: 10.1109/PROC.1978.10837.
29. Reid J., El-Sherbiny M., Garside B.K., Ballik E.A. Sensitivity limits of a tunable diode laser spectrometer, with application to the detection of NO(2) at the 100-ppt level. J. Appl. Opt. 1980;19:3349–3354. doi: 10.1364/AO.19.003349.
30. Tenoudji F.C. Analog and Digital Signal Analysis. 1st ed. Springer International Publishing; Cham, Switzerland: 2016. pp. 265–267.
31. Rothman L.S., Gordon I.E., Babikov Y., Barbe A., Chris Benner D., Bernath P.F., Birk M., Bizzocchi L., Boudon V., Brown L.R., et al. The HITRAN2012 molecular spectroscopic database. J. Quant. Spectrosc. Radiat. Transf. 2013;130:4–50. doi: 10.1016/j.jqsrt.2013.07.002.
32. SpectraPlot the Wavelength Search Engine.
本文原著：Umberto Michelucci and Francesca Venturini
本文由山东如特安防设备有限公司LK编译，转载必须注明来自 sdrtkm.com
本文原著：Umberto Michelucci and Francesca Venturini
本文由山东如特安防设备有限公司LK编译，转载必须注明来自 sdrtkm.com
本文标签字：干扰 干扰消除 噪声降低 数字滤波 光谱学 传感器
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