Real-time stand-off spatial detection and identification of gases and vapor using external-cavity quantum cascade laser open-path spectrometer

Aharoni, Ran; Ron, Izhar; Gilad, Nadav; Manor, Alon; Arav, Yehuda; Kendler, Shai

doi:10.1117/1.oe.54.6.067103

Cited by 13 publications

(3 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Stand-off detection of vapors and gases utilizing their resonance absorption of electromagnetic radiation is well-known and widely described in literature [ 1 , 2 , 3 , 4 , 5 , 6 , 7 ]. A particular case of this method is the detection of alcohol in the air exhaled by humans.…”

Section: Introductionmentioning

confidence: 99%

Stand-Off Detection of Alcohol Vapors Exhaled by Humans

Młyńczak

Kubicki

Kopczyński

2018

Sensors

View full text Add to dashboard Cite

Early detection of humans under the influence of alcohol in public places (workplace, public gathering) is particularly important for safety reasons. In this article, the theoretical analysis of stand-off detection of alcohol in the air exhaled by humans as well as experimental results of the developed experimental setup is presented. The concept of differential absorption of two laser beams at different wavelengths was used. The idea of using standard deviation of the relative difference of the amplitudes of two signals to detect the alcohol was applied for the first time. The idea was verified by the experiments and it was shown that a reliable device can be developed that can efficiently detect alcohol concentration in the exhaled air at the level of 0.3 mg/L (0.63‰). Moreover, the concept of such device examining humans entering a specific area was proposed. The results of this article may be useful to scientists or engineers working on alcohol detection in human blood.

show abstract

Section: Introductionmentioning

confidence: 99%

Stand-Off Detection of Alcohol Vapors Exhaled by Humans

Młyńczak

Kubicki

Kopczyński

2018

Sensors

View full text Add to dashboard Cite

show abstract

“…In addition, the mixing of gases within the planetary boundary layer is currently a major source of uncertainty in atmospheric transport models [12–14], which results in errors in source quantification using point sensors or satellites. Finally, this technique could be used to rapidly scan an area for the presence of hazardous gases [15] and threat chemicals [16]. …”

mentioning

confidence: 99%

Open-path dual-comb spectroscopy to an airborne retroreflector

Cossel

Waxman

Giorgetta

et al. 2017

Optica

View full text Add to dashboard Cite

We demonstrate a new technique for spatial mapping of multiple atmospheric gas species. This system is based on high-precision dual-comb spectroscopy to a retroreflector mounted on a flying multi-copter. We measure the atmospheric absorption over long open-air paths to the multi-copter with comb-tooth resolution over 1.57 to 1.66 pm, covering absorption bands of CO2, Cm, H2O and isotopologues. When combined with GPS-based path length measurements, a fit of the absorption spectra retrieves the dry mixing ratios versus position. Under well-mixed atmospheric conditions, retrievals from both horizontal and vertical paths show stable mixing ratios as expected. This approach can support future boundary layer studies as well as plume detection and source location.

show abstract

“…Technological developments in image sensors and optics lens have contributed to the rapidly increasing use of vision-based measurement methods as noncontact measurement methods in numerous research and industrial areas, such as vibration analysis, 4,5 condition monitoring, [6][7][8][9][10][11] human motion, 12,13 and underwater measurement. 14 With a relatively lower cost and better flexibility in structure, optical devices and cameras offer effective alternatives to noncontact equipment.…”

Section: Introductionmentioning

confidence: 99%

Vision-based displacement measurement sensor using modified Taylor approximation approach

et al. 2016

View full text Add to dashboard Cite

, "Vision-based displacement measurement sensor using modified Taylor approximation approach," Opt. Eng. 55 (11) Abstract. The development of image sensors and optics lenses has contributed to the rapidly increasing use of vision-based methods as noncontact measurement methods in many areas. A high-speed camera system is developed to realize the displacement measurement in real time. Conventional visual measurement algorithms are commonly subjected to various shortcomings, such as complex processes, multiparameter adjustments, or integer-pixel accuracy. Inspired from the combination of block-matching algorithm and simplified optical flow, a motion estimation algorithm that uses modified Taylor approximation is proposed and applied to the vision sensor system. Simplifying integer-pixel searching with a rounding-iterative operation enables the modified algorithm to rapidly accomplish one displacement extraction within 1 ms and yield satisfactory subpixel accuracy. The performance of the vision sensor is evaluated through a simulation test and two experiments on a grating ruler motion platform and a steering wheel system of a forklift. Experimental results show that the developed vision sensor can extract accurate displacement signals and accomplish the vibration measurement of engineering structures.

show abstract

Real-time stand-off spatial detection and identification of gases and vapor using external-cavity quantum cascade laser open-path spectrometer

Cited by 13 publications

References 21 publications

Stand-Off Detection of Alcohol Vapors Exhaled by Humans

Stand-Off Detection of Alcohol Vapors Exhaled by Humans

Open-path dual-comb spectroscopy to an airborne retroreflector

Vision-based displacement measurement sensor using modified Taylor approximation approach

Contact Info

Product

Resources

About