Parameters of differential absorption lidar for detecting molecular iodine in the atmosphere

Privalov, V. E.; Shemanin, V. G.

doi:10.1364/jot.66.000112

Cited by 7 publications

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“…The system characteristics of an iodine DIAL system were also studied using a 532 nm (on-line) and 1064 nm (off-line) wavelength combination. Measured results of the iodine cell concentration, taken in the laboratory with the cell located on axis for distances of up to 8 m, were shown to correspond to the simulation results [13]. However, this method is difficult to apply under actual polluted atmospheric conditions because of differential scattering.…”

Section: Experimental Suggestionsmentioning

confidence: 72%

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Implementation of Differential Absorption LIDAR (DIAL) for Molecular Iodine Measurements Using Injection-Seeded Laser

Choi¹,

Baik²,

Park³

et al. 2012

Journal of the Optical Society of Korea

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Differential absorption LIDAR (DIAL) is frequently used for atmospheric gas monitoring to detect impurities such as nitrogen dioxide, sulfur dioxide, iodine, and ozone. However, large differences in the on-and off-line laser wavelengths can cause serious errors owing to differential aerosol scattering. To resolve this problem, we have developed a new DIAL system for iodine vapor measurements in particular. The suggested DIAL system uses only one laser under seeded and unseeded conditions. To check the detection-sensitivity and error effects, we compared the results from a system using two seeded lasers with those from a system using a seeded and an unseeded laser. We demonstrate that the iodine concentration sensitivity of our system is improved in comparison to the conventional two seeded or two unseeded laser combinations.

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Section: Experimental Suggestionsmentioning

confidence: 72%

“…Privalov and Shemanin [13] discussed the possibility of using DIAL to probe molecular iodine in the atmosphere by numerically solving and correcting the LIDAR equation. A copper-vapor laser was considered as the radiation source with wavelength combinations of 501 and 578 nm or 578 and 647 nm.…”

Section: Experimental Suggestionsmentioning

confidence: 99%

Implementation of Differential Absorption LIDAR (DIAL) for Molecular Iodine Measurements Using Injection-Seeded Laser

Choi¹,

Baik²,

Park³

et al. 2012

Journal of the Optical Society of Korea

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“…The results from earlier studies [15,17,18] suggest that using differential absorption systems is the best option when molecular iodine concentrations on the order of 10 10 cm -3 are to be detected in the atmo sphere, as the absorption cross section of iodine mole cules is larger than the effective fluorescence cross sec tion, allowing for quenching and the elastic scattering cross section [8]. Using the attenuation of laser radia tion with the corresponding choice of the radiation wavelength, we can develop a sensitive technique for measuring the concentration of iodine molecules in the atmosphere [14].…”

Section: Differential Absorption and Scattering Lidarmentioning

confidence: 99%

“…(12) in the form (14) We then use the error function integral erf (Γ) [11] to rearrange the last two exponential functions in (14): (15) Assuming that K(z) depends only marginally on frequency ν in the studied range 2Γ, G(z) is in this case equal to 1, and the value of exp[-2K(z)z] in the range of 200 < z < 5000 m is also of the order of 1, we can esti mate the elastic backscattering power for half width Γ values ranging from 1 to 4 GHz. We also assume that the instrument function half width is an order of mag nitude greater than the lasing line half width (which is quite acceptable for industrial lasers and the interfer ence optical filters used as the spectrum analyzer of a lidar [12]).…”

Section: Introductionmentioning

confidence: 99%

A lidar equation with allowance for the finite width of the lasing line

Privalov

Shemanin

2015

Bull. Russ. Acad. Sci. Phys.

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<title>Molecular iodine laser monitoring in the atmosphere</title>

Privalov

Shemanin

2000

International Conference on Lasers for Measurements and Information Transfer

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Copper vapor pulse laser radiation has a wide application in molecular iodine monitoring in atmosphere [1][2][3][4]. Back scattering Fluorecense, vibrational Raman and Differential Absorption lidar equtions computer simulation for iodine molecules and copper vapour and eximer lasers have been made to compare these lidar systems possibilities for studied molecules monitoring in atmosphere. Background stray sunlight power were calculated to determine the minimum molecules concentration at ranging distance up to 5 km. LASER PARAMETERSCopper vapour pulse laser can be taken in wide application for molecular iodine lidar monitoring in atmosphere [1][2][3][4]. Peak power value of 130 kW at 5 10.6 nm wavelengh and second harmonic in UV spectrum at 289. 1 nm wavelengh power of 75 mW at first harmonic power of 1 W (conversion efficiency is 7.5 %) have been reported in [5]. Thus it can be achivied laser pulses durations of 10 ns with repetition rate up to 20 kHz at 5 10,6 mn, 255.3 nm (second harmonic), 578.2 mn, 289. 1 nm (second harmonic) and 271.2 nm (sum frequency) with peak power of 130, 9, 150, 1 1 and 10 kW. Above this, N pusles integration regime applying to lidar signal recording allowes to have range distance as at effective power is equal to P N'2 [51.The results for XeCl eximer laser which was widely used in lidars and gives pulses with energy upto 0.1 J, duration of 10 ns at 308 nm wavelengh and repetition rate to 50 Hz [6] were demonstrated comparing with other laser results. FLUORESCENCE LIDAR EQUATIONFluorescense lidar 12 molecules monitoring with such a laser has been described in [1,2]. Back scattering Fluorescense lidar eqution computer simulation for 127 12 molecules with lasers of such a parameters is of interest to choose laser wavelength for iodine molecules minimal concentration detection.Fluorescense lidar equation was taken as in [2]. Studied iodine molecules maximum fluorescense band wavelength were choosen 589,5 mn, differencial fluorescense cross section at this wavelength -6.1 1022 cm2/str, fluorescense decay factor -i0, , fluorescense time decay 1000 ns in accordance to [6].

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Parameters of differential absorption lidar for detecting molecular iodine in the atmosphere

Cited by 7 publications

References 0 publications

Implementation of Differential Absorption LIDAR (DIAL) for Molecular Iodine Measurements Using Injection-Seeded Laser

Implementation of Differential Absorption LIDAR (DIAL) for Molecular Iodine Measurements Using Injection-Seeded Laser

A lidar equation with allowance for the finite width of the lasing line

<title>Molecular iodine laser monitoring in the atmosphere</title>

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