Differential optical absorption spectroscopy lidar for mid-infrared gaseous measurements

Lambert-Girard, Simon; Allard, Martin; Piché, Michel; Babin, F.

doi:10.1364/ao.54.001647

Cited by 42 publications

(21 citation statements)

References 18 publications

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“…In order to study this feature, the OPG output was focused with an off-axis parabolic mirror on a sandblasted aluminum target positioned at 9 m from the focusing mirror. The returned beam was then imaged onto the entrance slit of the spectrometer using a LIDAR receiver telescope (200 mm clear aperture) The optical path reproduces that used in remote gas sensing experiments with the OPG [6]. After the output parabolic mirror, a ∼1 × 1 mm 2 square aperture was inserted at ∼15 cm.…”

Section: B Output Beammentioning

confidence: 99%

“…Infrared chalcogenide fibers allow extension of the supercontinuum above 5 μm [5]. The broad spectra of supercontinuum sources offer low pulse spectral density (<nJ∕nm), which is unsuitable for gated gas measurements using noncooperative targets or aerosol returns [6].…”

Section: Introductionmentioning

confidence: 99%

“…The concept behind the operation of our system [6] combines the best features of the broadband and tunable approaches described above. A source emits a moderately broadband (10-100 nm) pulse at kHz repetition rate; the pulse is tunable into the MWIR signature region defined by the application.…”

Section: Introductionmentioning

confidence: 99%

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Broadband and tunable optical parametric generator for remote detection of gas molecules in the short and mid-infrared

et al. 2015

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The development of a novel broadband and tunable optical parametric generator (OPG) is presented. The OPG properties are studied numerically and experimentally in order to optimize the generator's use in a broadband spectroscopic LIDAR operating in the short and mid-infrared. This paper discusses trade-offs to be made on the properties of the pump, crystal, and seeding signal in order to optimize the pulse spectral density and divergence while enabling energy scaling. A seed with a large spectral bandwidth is shown to enhance the pulse-to-pulse stability and optimize the pulse spectral density. A numerical model shows excellent agreement with output power measurements; the model predicts that a pump having a large number of longitudinal modes improves conversion efficiency and pulse stability.

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Section: B Output Beammentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Broadband and tunable optical parametric generator for remote detection of gas molecules in the short and mid-infrared

et al. 2015

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“…For stand-off detection of vapor phase chemicals, published detection limits vary greatly depending on the detection scenario and the absorption cross-section of the chemical of interest 3,5,9,10,11,12,13 . In general, the larger absorption cross-sections found in the shortwave-and longwave-infrared regions (3-5 µm, SWIR and 8-12 µm, LWIR) provide higher sensitivity than the near-infrared (1-2 µm).…”

Section: Current Instrumentationmentioning

confidence: 99%

High sensitivity stand-off detection and quantification of chemical mixtures using an active coherent laser spectrometer (ACLaS)

Macleod

Weidmann

2016

SPIE Proceedings

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High sensitivity detection, identification and quantification of chemicals in a stand-off configuration is a highly sought after capability across the security and defense sector. Specific applications include assessing the presence of explosive related materials, poisonous or toxic chemical agents, and narcotics.Real world field deployment of an operational stand-off system is challenging due to stringent requirements: high detection sensitivity, stand-off ranges from centimeters to hundreds of meters, eye-safe invisible light, near real-time response and a wide chemical versatility encompassing both vapor and condensed phase chemicals. Additionally, field deployment requires a compact, rugged, power efficient, and cost-effective design.To address these demanding requirements, we have developed the concept of Active Coherent Laser Spectrometer (ACLaS), which can be also described as a middle infrared hyperspectral coherent lidar. Combined with robust spectral unmixing algorithms, inherited from retrievals of information from high-resolution spectral data generated by satellitebased spectrometers, ACLaS has been demonstrated to fulfil the above-mentioned needs.ACLaS prototypes have been so far developed using quantum cascade lasers (QCL) and interband cascade lasers (ICL) to exploit the fast frequency tuning capability of these solid state sources. Using distributed feedback (DFB) QCL, demonstration and performance analysis were carried out on narrow-band absorbing chemicals (N 2 O, H 2 O, H 2 O 2 , CH 4 , C 2 H 2 and C 2 H 6 ) at stand-off distances up to 50 m using realistic non cooperative targets such as wood, painted metal, and bricks. Using more widely tunable external cavity QCL, ACLaS has also been demonstrated on broadband absorbing chemicals (dichloroethane, HFC134a, ethylene glycol dinitrate and 4-nitroacetanilide solid) and on complex samples mixing narrow-band and broadband absorbers together in a realistic atmospheric background.

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“…The IR absorption platform makes use of a Medium Wavelength Infrared (MWIR) laser source and a large aperture collecting telescope 10,11 (somewhat similar to the UV platform). The laser beam hits a sandblasted aluminum panel lying on the soil and thus does not penetrate the soil.…”

Section: Ir Absorptionmentioning

confidence: 99%

Airborne pipeline leak detection: UV or IR?

2016

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This paper presents a study of different approaches to the measurement of the above ground vapor plume created by the spill caused by a small 0.1 l/min (or less) leak in an underground liquid petroleum pipeline. The scenarios are those for the measurement from an airborne platform. The usual approach is that of IR absorption, but in the case of liquid petroleum products, there are drawbacks that will be discussed, especially when using alkanes to detect a leak. The optical measurements studied include UV enhanced Raman lidar, UV fluorescence lidar and IR absorption path integrated lidars. The breadboards used for testing the different approaches will be described along with the set-ups for leak simulation. Although IR absorption would intuitively be the most sensitive, it is shown that UV-Raman could be an alternative. When using the very broad alkane signature in the IR, the varying ground spectral reflectance are a problem. It is also determined that integrated path measurements are preferred, the UV enhanced Raman measurements showing that the vapor plume stays very close to the ground.

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Differential optical absorption spectroscopy lidar for mid-infrared gaseous measurements

Cited by 42 publications

References 18 publications

Broadband and tunable optical parametric generator for remote detection of gas molecules in the short and mid-infrared

Broadband and tunable optical parametric generator for remote detection of gas molecules in the short and mid-infrared

High sensitivity stand-off detection and quantification of chemical mixtures using an active coherent laser spectrometer (ACLaS)

Airborne pipeline leak detection: UV or IR?

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