Design of a portable optical sensor for methane gas detection

Massie, Crawford; Stewart, George; McGregor, George; Gilchrist, John R.

doi:10.1016/j.snb.2005.03.105

Cited by 136 publications

(61 citation statements)

References 10 publications

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“…The limit of detection (LOD) has been calculated as three times the standard deviation of the base line in our calibration plot (Figure 4). The average of the three calculated limits of detection was 0.001145 mg/L or 12 ppb which is a significant reduction on many published similar sensing devices [10,11,18].…”

Section: Calibration Of Sensormentioning

confidence: 85%

The optimisation of a paired emitter–detector diode optical pH sensing device

Orpen

Beirne

Fay

et al. 2011

Sensors and Actuators B: Chemical

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With recent improvements in wireless sensor network hardware there has been a concurrent push to develop sensors that are suitable in terms of price and performance.In this paper a low cost gas sensor is detailed, and significant improvements in sensor characteristics have been achieved compared to previously published results. A chemical sensor is presented based on the use of low cost LEDs as both the light source and photodetector, coupled with a sensor slide coated with a pH sensitive colorimetric dye to create a simple gas sensor. Similar setups have been successfully used to detect both acetic acid and ammonia. The goal of this work was to optimise the system performance by integration of the sensing technique into a purposely deigned flowcell platform that holds the colorimetric slide and optical detector in position. The reproducibility of the sensor has been improved through this arrangement and careful control of deposited film thickness. The enhanced reproducibility between sensors opens the potential of calibration-free measurement, in that calibration of one sensor can be used to model the characteristics of all sensors in a particular batch.

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Section: Calibration Of Sensormentioning

confidence: 85%

The optimisation of a paired emitter–detector diode optical pH sensing device

Orpen

Beirne

Fay

et al. 2011

Sensors and Actuators B: Chemical

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“…The methane sensor is mounted inside the vehicle, and uses air from the ASRG-cooling intake to perform its work without distrupting exterior airflow. The instrument itself would be designed specifically for the mission, but is based on similar devices used to monitor methane gas buildup on Earth [91].…”

Section: Winds and Atmospheric Structure Suitementioning

confidence: 99%

AVIATR—Aerial Vehicle for In-situ and Airborne Titan Reconnaissance

et al. 2011

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We describe a mission concept for a stand-alone Titan airplane mission: Aerial Vehicle for In-situ and Airborne Titan Reconnaissance (AVI-ATR). With independent delivery and direct-to-Earth communications, AVI-ATR could contribute to Titan science either alone or as part of a sustained Titan Exploration Program. As a focused mission, AVIATR as we have envisioned it would concentrate on the science that an airplane can do best: exploration of Titan's global diversity. We focus on surface geology/hydrology and lower-atmospheric structure and dynamics. With a carefully chosen set of seven instruments-2 near-IR cameras, 1 near-IR spectrometer, a RADAR altimeter, an atmospheric structure suite, a haze sensor, and a raindrop detector-AVIATR could accomplish a significant subset of the scientific objectives of the aerial element of flagship studies. The AVIATR spacecraft stack is composed of a Space Vehicle (SV) for cruise, an Entry Vehicle (EV) for entry and descent, and the Air Vehicle (AV) to fly in Titan's atmosphere. Using an Earth-Jupiter gravity assist trajectory delivers the spacecraft to Titan in 7.5 years, after which the AVIATR AV would operate for a 1-Earthyear nominal mission. We propose a novel 'gravity battery' climb-then-glide strategy to store energy for optimal use during telecommunications sessions. We would optimize our science by using the flexibility of the airplane platform, generating context data and stereo pairs by flying and banking the AV instead

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“…The most significant system aspect is whether the spectral selectivity is implemented in the light source or in the detector. Scanning the spectrum with a tunable light source -either in narrowband with tunable diode-lasers [14] or in wideband using quantum cascade lasers [15]-and selecting one specific wavelength, as is the case in the nondispersive IR (NDIR) gas sensor [16], are two main methods used for implementing spectral selectivity in the light source. The second option is implemented in the detector, where the spectrum is scanned using a wideband source and a tunable narrowband filter at the detector [17].…”

Section: Introductionmentioning

confidence: 99%

Compact gas cell integrated with a linear variable optical filter

2016

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A miniaturized methane (CH 4 ) sensor based on nondispersive infrared absorption is realized in MEMS technology. A high level of functional integration is achieved by using the resonance cavity of a linear variable optical filter (LVOF) also as a gas absorption cell. For effective detection of methane at λ = 3.39 µm, an absorption path length of at least 5 mm is required. Miniaturization therefore necessitates the use of highly reflective mirrors and operation at the 15th-order mode with a resonator cavity length of 25.4 µm. The conventional description of the LVOF in terms of the Fabry-Perot resonator is inadequate for analyzing the optical performance at such demanding boundary conditions. We demonstrate that an approach employing the Fizeau resonator is more appropriate. Furthermore, the design and fabrication in a CMOS-compatible microfabrication technology are described and operation as a methane sensor is demonstrated. 1-3), 191-197 (2000). 604-606 (1990). 42. T. T. Kajava, H. M. Lauranto, and R. R. E. Salomaa, "Fizeau interferometer in spectral measurements," J. Opt. ©2016 Optical Society of AmericaSoc. Am. B 10(11), 1980-1989 (1993). 43. P. Langenbeck, "Fizeau interferometer-fringe sharpening," Appl. Opt. 9(9), 2053-2058 (1970) Characteristics," Appl. Opt. 6(8), 1343-1351 (1967). 49. J. Altmann, R. Baumgart, and C. Weitkamp, "Two-mirror multipass absorption cell," Appl. Opt. 20(6), 995-999 (1981

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Design of a portable optical sensor for methane gas detection

Cited by 136 publications

References 10 publications

The optimisation of a paired emitter–detector diode optical pH sensing device

The optimisation of a paired emitter–detector diode optical pH sensing device

AVIATR—Aerial Vehicle for In-situ and Airborne Titan Reconnaissance

Compact gas cell integrated with a linear variable optical filter

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