An optical sensor for nitrogen dioxide based on a copper phthalocyanine Langmuir—Blodgett film

Zhu, Dong; Petty, Michael C.; Harris, M. T.

doi:10.1016/0925-4005(90)80152-p

Cited by 64 publications

(25 citation statements)

References 8 publications

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“…The ability to sense gaseous species without disturbing a specific environment and do so in the absence of electrical contacts and wiring is ideal for systems that concern aging of energetic materials. A current drawback of many current optical sensors, however, is the poor reversibility observed at room temperature (2,4,6,7). On the other hand, for specific applications where continuous NO 2 evolution is of interest these sensor films may be used in a dosimeter capacity and follow the outgassing and buildup of NO 2 .…”

Section: Autonomous Optical Sensor System For the Monitoring Of Nitromentioning

confidence: 99%

“…An array of techniques have been developed that use a variety of reactive dyes and optical platforms (2,3,4,5). Several advantages are unique to the optical sensor systems, most important of which is the capability of remote detection.…”

Section: Autonomous Optical Sensor System For the Monitoring Of Nitromentioning

confidence: 99%

“…Fluorescence response vs. time data of sensor films ………………………… 11 4 Schematic of the autonomous gas optical-sensor system …………………… 12 5 Pictures of the autonomous gas sensor system ………………………………… 13 6 Optical response of sensor system to 100 and 1000 ppm NO 2 ………………… 14 7…”

Section: Contentsmentioning

confidence: 99%

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Autonomous Optical Sensor System for the Monitoring of Nitrogen Dioxide from Aging Rocket Propellant

Cox¹,

Singh²,

Hunter³

et al. 2001

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An optical sensor system has been developed for the autonomous monitoring of NO 2 evolution in energetic material aging studies. The system is minimally invasive, requiring only the presence of a small sensor film within the aging chamber. The sensor material is a perylene/PMMA film that is excited by a blue LED light source and the fluorescence detected with a CCD spectrometer. Detection of NO 2 gas is done remotely through the glass window of the aging chamber. Irreversible reaction of NO 2 with perylene, producing the non-fluorescent nitroperylene, provides the optical sensing scheme. The rate of fluorescence intensity loss over time can be modeled using a numerical solution to the coupled diffusion and a nonlinear 4 chemical reaction problem to evaluate NO 2 concentration levels. The light source, spectrometer, spectral acquision, and data processing were controlled through a Labview program run by a laptop PC. Due to the long times involved with materials aging studies the system was designed to turn on, warm up, acquire data, power itself off, then recycle at a specific time interval. This allowed the monitoring of aging HE material over the period of several weeks with minimal power consumption and stable LED light output. Despite inherent problems with gas leakage of the aging chamber we were able to test the sensor system in the field under an accelerated aging study of rocket propellant. We found that the propellant evolved NO 2 at a rate that yielded a concentration of between 10 and 100 ppm. The sensor system further revealed that the propellant, over an aging period of 25 days, evolves NO 2 with cyclic behavior between active and dormant periods.5

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Section: Autonomous Optical Sensor System For the Monitoring Of Nitromentioning

confidence: 99%

Section: Autonomous Optical Sensor System For the Monitoring Of Nitromentioning

confidence: 99%

Section: Contentsmentioning

confidence: 99%

See 1 more Smart Citation

Autonomous Optical Sensor System for the Monitoring of Nitrogen Dioxide from Aging Rocket Propellant

Cox¹,

Singh²,

Hunter³

et al. 2001

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“…A current drawback with these sensor films, however, is the poor reversibility observed at room temperature [2,5,6,8,9].…”

Section: Introductionmentioning

confidence: 99%

“…The sensor materials typically consist of robust optical dyes, such as metal phthalocyanines [6], porphyrins [2], and azobenzenes [7], applied to various surfaces using LangmuirBlodge~t (LB) fiim deposition [8], vapor deposition [5], and dip coating [7] techniques.…”

Section: Introductionmentioning

confidence: 99%