Standoff detection of ozone in an open environment using photoacoustic spectroscopy technique

2012 ◽  
Vol 100 (10) ◽  
pp. 104102 ◽  
Author(s):  
Hual-Te Chien ◽  
Ke Wang ◽  
Shuh-Haw Sheen ◽  
Apostolos C. Raptis
Keyword(s):  
Photoacoustic Spectroscopy ◽  
Spectroscopy Technique ◽  
Open Environment ◽  
Standoff Detection

Off-Resonance Photoacoustic Spectroscopy Technique for Multi-Gas Sensing in Biogas Plants

2019 ◽  
Vol 91 (22) ◽  
pp. 14239-14246 ◽  
Author(s):  
Ramya Selvaraj ◽  
Nilesh J. Vasa ◽  
S. M. Shiva Nagendra
Keyword(s):  
Photoacoustic Spectroscopy ◽  
Gas Sensing ◽  
Spectroscopy Technique ◽  
Biogas Plants

Evaluation of Nitrous Oxide Emitted from Diesel/Biodiesel Blends during Combustion in a Diesel Engine at Laboratory Scale by a Photoacoustic Spectroscopy Technique

2014 ◽  
Vol 28 (6) ◽  
pp. 4028-4032 ◽  
Author(s):  
Aline M. Rocha ◽  
Marcelo S. Sthel ◽  
Maria P. P. de Castro ◽  
Geórgia A. Mothé ◽  
Wellington C. Silva ◽  
...  
Keyword(s):  
Nitrous Oxide ◽  
Diesel Engine ◽  
Photoacoustic Spectroscopy ◽  
Laboratory Scale ◽  
Spectroscopy Technique ◽  
Biodiesel Blends

scholarly journals Deep Ultraviolet Standoff Photoacoustic Spectroscopy of Trace Explosives

2018 ◽  
Vol 73 (6) ◽  
pp. 601-609 ◽  
Author(s):  
Alyssa B. Zrimsek ◽  
Sergei V. Bykov ◽  
Sanford A. Asher
Keyword(s):  
Photoacoustic Spectroscopy ◽  
Signal Strength ◽  
Pentaerythritol Tetranitrate ◽  
Gaseous Species ◽  
Absorption Bands ◽  
Standoff Detection ◽  
Deep Ultraviolet ◽  
Deep Uv ◽  
Trace Explosives ◽  
The Impact

We demonstrate deep ultraviolet (UV) photoacoustic spectroscopy (PAS) of trace explosives using a sensitive microphone at meter standoff distances. We directly detect 10 µg/cm2 of pentaerythritol tetranitrate (PETN), 2,4,6-trinitrotoluene (TNT), and ammonium nitrate (AN) with 1 s accumulations from a 3 m standoff distance. Large PAS signals for standoff detection are achieved by exciting into the absorption bands of the explosives with a 213 nm laser. We also investigate the impact of the deep UV photochemistry of AN on the PAS signal strength and stability. We find that production of gaseous species during photolysis of AN enhances the PAS signal strength. This deep UV photochemistry can, however, limit the PAS signal lifetimes when detecting trace quantities.

scholarly journals Femtosecond Filaments for Standoff Detection of Explosives

2020 ◽  
Vol 70 (4) ◽  
pp. 359-365 ◽  
Author(s):  
Venugopal Rao Soma ◽  
Abdul Kalam Shaik
Keyword(s):  
Energetic Materials ◽  
Principal Component ◽  
Hazardous Materials ◽  
Harsh Environments ◽  
Spectroscopy Technique ◽  
Breakdown Spectroscopy ◽  
Standoff Detection ◽  
The Common ◽  
Cassegrain Telescope ◽  
Detection Of Explosives

In this report, we present our results from various studies to qualitatively discriminate the common military explosives viz. RDX, TNT and HMX in their pure form at a distance of ~6.5 m in standoff mode using femtosecond (fs) filament induced breakdown spectroscopy technique (fs FIBS) together with principal component analysis. A ~30 cm length fs filament obtained by a two-lens configuration was used to interrogate those energetic molecules in the form of pressed pellets (150 mg each). The plasma emissions were collected by a Schmidt-Cassegrain telescope (SCT) from a distance of ~8 m away from the investigation zone. Additionally, a few significant results obtained from the LIBS-based investigations of nitroimidazoles with respect to the standoff distance (~2 m) are discussed. Furthermore, we have also summarised a few important results from our recent investigations of bulk energetic materials in various configurations (including those with fs filaments). The results obtained from various fs FIBS configurations corroborate that the filament generation and its properties, the size and f-number of collection optics influence signal strength in the FIBS technique. These results project the fs FIBS technique as a potential technique for investigations aimed at hazardous materials and harsh environments in the standoff mode.

Standoff detection of explosives in open environment using enhanced photodissociation fluorescence

2010 ◽  
Author(s):  
T. Arusi-Parpar ◽  
S. Fastig ◽  
J. Shapira ◽  
B. Shwartzman ◽  
D. Rubin ◽  
...  
Keyword(s):  
Open Environment ◽  
Standoff Detection ◽  
Detection Of Explosives

scholarly journals Estimate of expired air samples of patients with the pulmonary tuberculosis using laser photoacoustic spectroscopy technique

2012 ◽  
Vol 11 (4) ◽  
pp. 116-120 ◽  
Author(s):  
B. G. Ageyev ◽  
Yu. V. Kistenyov ◽  
Ye. V. Nekrasov ◽  
О. Yu. Nikiforova ◽  
Yе. S. Nikotin ◽  
...  
Keyword(s):  
Pulmonary Tuberculosis ◽  
Photoacoustic Spectroscopy ◽  
Spectroscopy Technique ◽  
Air Samples ◽  
Laser Photoacoustic Spectroscopy ◽  
Expired Air

All-Optical Cantilever-Enhanced Photoacoustic Spectroscopy in the Open Environment

2015 ◽  
Vol 36 (5-6) ◽  
pp. 1116-1122 ◽  
Author(s):  
Wei Wei ◽  
Yong Zhu ◽  
Cheng Lin ◽  
Li Tian ◽  
Zhuwen Xu ◽  
...  
Keyword(s):  
Photoacoustic Spectroscopy ◽  
Open Environment ◽  
All Optical
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