Differential-Absorption Lidar for Ozone and Industrial Emissions

Gimmestad, Gary G.

doi:10.1007/0-387-25101-4_7

Cited by 19 publications

(7 citation statements)

References 54 publications

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“…If the Stokes line center is stabilized, these spectral features are potentially significant for advanced lidar applications. For example, by using different gases and or pump wavelengths, 28 it may be possible to perform differential absorption lidar 29,30 (DIAL) for important atmospheric species such as water vapor. Furthermore, by constructing a long path-length notch filter using HCN in a receiver, it would be possible to separate molecular from aerosol backscatter.…”

Section: Discussionmentioning

confidence: 99%

Raman shifter optimized for lidar at a 15 μm wavelength

Spuler

Mayor

2007

Appl. Opt.

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A Raman shifter is optimized for generating high-energy laser pulses at a 1.54 microm wavelength. A forward-scattering design is described, including details of the multiple pass and nonfocused optical design, Stokes injection seeding, and internal gas recirculation. First-Stokes conversion efficiencies up to 43%--equivalent to 62% photon conversion efficiency--were measured. Experimental results show output average power in excess of 17.5 W, pulse energies of 350 mJ at 50 Hz, with good beam quality (M2<6). Narrow bandwidth and tunable output is produced when pumping with a single longitudinal mode Nd:YAG laser and seeding the process with a Stokes wavelength narrowband laser diode.

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Section: Discussionmentioning

confidence: 99%

Raman shifter optimized for lidar at a 15 μm wavelength

Spuler

Mayor

2007

Appl. Opt.

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“…where ∆σ is the differential absorption cross-section (∆σ = σ(λ on ) − σ(λ off )) [20]. P on is the echo signal of λ on and P off is the echo signal of λ off .…”

Section: Dial Theorymentioning

confidence: 99%

High Repetition Rate Mid-Infrared Differential Absorption Lidar for Atmospheric Pollution Detection

Gong

Yang³

et al. 2020

Sensors

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Developments in mid-infrared Differential Absorption Lidar (DIAL), for gas remote sensing, have received a significant amount of research in recent years. In this paper, a high repetition rate tunable mid-infrared DIAL, mounted on a mobile platform, has been built for long range remote detection of gas plumes. The lidar uses a solid-state tunable optical parametric oscillator laser, which can emit laser pulse with repetition rate of 500 Hz and between the band from 2.5 μm to 4 μm. A monitoring channel has been used to record the laser energy in real-time and correct signals. Convolution correction technology has also been incorporated to choose the laser wavelengths. Taking NO2 and SO2 as examples, lidar system calibration experiment and open field observation experiment have been carried out. The observation results show that the minimum detection sensitivity of NO2 and SO2 can reach 0.07 mg/m3, and 0.31 mg/m3, respectively. The effective temporal resolution can reach second level for the high repetition rate of the laser, which demonstrates that the system can be used for the real-time remote sensing of atmospheric pollution gas.

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“…Optical methods exploit the fact that hydrocarbons absorb, emit, and scatter radiation at select wavelengths that are transparent to other ambient species. One of the most accurate of these techniques is differential absorption light detection and ranging, DIAL, which infers the concentration of airborne hydrocarbons from the difference between backscattered laser light measured at two wavelengths [14]. DIAL provides highly accurate environmental measurements of volatile organic compounds (VOCs) in the C2 to C22 range, including alkanes, alkenes, aromatics, benzene, and toluene, as well as simple molecules like methane (CH4) [12,[15][16][17][18][19][20], but is too costly and complex to use on a daily basis.…”

Section: Introductionmentioning

confidence: 99%