WILDCAT sensor

Cohn, D. B.; Griffin, William S.; Klaras, Louis F.; Griffin, Eric; Marciniak, Hans C.; Fox, Jay A.; Swim, Cynthia R.

doi:10.1117/12.394065

Cited by 3 publications

(2 citation statements)

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“…Differential absorption lidar is a powerful technique for remote detection of chemical gases in the atmosphere [3]. Lidars based on CO 2 laser were used as workhorses for operating in the mid-infrared spectral region near 10 microns till now [4][5][6]. Mid-infrared spectral region is very attractive because in it are situated practically all atmospheric chemical pollutions molecules vibronic spectra, it is called "molecular finger-print region".…”

Section: Introductionmentioning

confidence: 99%

An OPO-based lidar system for differential absorption measurements of hazardous gases in mid-infrared spectral region.

Vaicikauskas¹,

Kabelka²,

Kuprionis

et al. 2005

Electro-Optical Remote Sensing

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We present the second phase of our work in project LISATNAS devoted to design the differential absorption lidar (DIAL) based on the mid-infrared (IR) tunable Optical Parametric Oscillator (OPO). Generation of tunable mid-infrared laser radiation using a two stage tandem OPO was demonstrated. The first stage was based on the nonlinear KTP crystal and produced up to 45 mJ of 1.57 µm radiation, while pumped by a commercial Q-switched Nd:YAG laser. The quality of signal beam was improved by the use of unstable resonator. The AgGaSe 2 crystal was used in the second stage OPO. Idler energies up to 1.2 mJ were generated in this stage within tuning range from 6 to 12 µm. The receiver consisted of a 250 mm gold mirror telescope, pyroelectric detector with control electronics. Preliminary field test results for detection of H 2 O using a retroreflector are presented.

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Section: Introductionmentioning

confidence: 99%

An OPO-based lidar system for differential absorption measurements of hazardous gases in mid-infrared spectral region.

Vaicikauskas¹,

Kabelka²,

Kuprionis

et al. 2005

Electro-Optical Remote Sensing

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“…Details of the WILDCAT sensor subsystems and details of sensor performance analysis are contained in a prior publication. 1 This paper contains an overview of the sensor, an update on its development, and a review of a novel CO 2 laser wavelength shifter.…”

Section: Introductionmentioning

confidence: 99%

<title>WILDCAT chemical sensor development</title>

et al. 2001

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The WILDCAT sensor was developed to provide chemical detection and identification at large standoff ranges on the order of 20 km for concentration-path length product measurements and 5 km for range-resolved measurements. The transmitter is a wavelength agile, CO 2 laser with output energy of 1 J/pulse at a repetition rate of 100 Hz. The laser wavelength can be shifted by a two-stage second harmonic generator and optical parametric oscillator to probe chemical absorption features outside the normal laser emission bands. The receiver is composed of a 60 cm dia. Cassegrain telescope and two-element HgCdTe detector that are integrated into a gimbal system for full hemispherical scanning. The laser/optical table and gimbal/telescope subsystems are connected by a rigid truss and all components are integrated into a transportable field test station. The data acquisition system is composed of 12 bit, 125 MHz analog-digital converters and a digital signal processor. Algorithms allow for real-time data processing and display of chemical concentration maps. All key transmitter and receiver components are capable of further development for compact, standalone sensors that can operate from fixed sites or mobile platforms, including aircraft, ships, and ground vehicles.

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Improved repetition rate mixed isotope CO2 TEA laser

Cohn¹

2014

Review of Scientific Instruments

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A compact CO2 TEA laser has been developed for remote chemical detection that operates at a repetition rate of 250 Hz. It emits 700 mJ/pulse at 10.6 μm in a multimode beam with the (12)C(16)O2 isotope. With mixed (12)C(16)O2 plus (13)C(16)O2 isotopes it emits multiple lines in both isotope manifolds to improve detection of a broad range of chemicals. In particular, output pulse energies are 110 mJ/pulse at 9.77 μm, 250 mJ/pulse at 10 μm, and 550 mJ/pulse at 11.15 μm, useful for detection of the chemical agents Sarin, Tabun, and VX. Related work shows capability for long term sealed operation with a catalyst and an agile tuner at a wavelength shift rate of 200 Hz.

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WILDCAT sensor

Cited by 3 publications

References 0 publications

An OPO-based lidar system for differential absorption measurements of hazardous gases in mid-infrared spectral region.

An OPO-based lidar system for differential absorption measurements of hazardous gases in mid-infrared spectral region.

<title>WILDCAT chemical sensor development</title>

Improved repetition rate mixed isotope CO2 TEA laser

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