Miniature low-power IR monitor for methane detection

Liu, Jun; Tan, Qiulin; Zhang, Wendong; Chen, Xue; Guo, Tao; Xiong, Jijun

doi:10.1016/j.measurement.2011.01.021

Cited by 53 publications

(17 citation statements)

References 23 publications

(30 reference statements)

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“…Such sources are required for defense counter measures [1], advanced sensing technologies for environmental monitoring [2][3][4], and in medicine [5][6][7]. Here, we demonstrate the first, to the best of our knowledge, fiber laser operating well beyond 3 μm with an average output power significantly over 100 mW.…”

mentioning

confidence: 97%

“…The promise of fiber lasers is particularly exciting for emission between 3 and 4 μm where many vibrational absorption bands of important hydrocarbons are located. Hence, lasers operating at these wavelengths will enable the sensing of important greenhouse gases, such as methane [2] and ethane released from fossil fuel production [8] and the widespread analysis of trace gases in exhaled breath [7], which could lead to noninvasive identification of new disease markers.…”

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confidence: 99%

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Mid-infrared fiber lasers at and beyond 35 μm using dual-wavelength pumping

2014

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We report the first, to the best of our knowledge, erbium-doped zirconium-fluoride-based glass fiber laser operating well beyond 3 μm with significant power. This fiber laser achieved 260 mW in CW at room temperature. The use of two different wavelength pump sources allows us to take advantage of the long-lived excited states that would normally cause a bottleneck, and this enables maximum incident optical-to-optical efficiency of 16% with respect to the total incident pump power. Both output power and efficiency are an order of magnitude improvement over similar lasers demonstrated previously. The fiber laser operating at 3.604 μm also exhibited the longest wavelength of operation obtained to date for a room temperature, nonsupercontinuum fiber laser.

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confidence: 97%

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confidence: 99%

Mid-infrared fiber lasers at and beyond 35 μm using dual-wavelength pumping

2014

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“…As the ambient temperature and concentration of CO2 gas increase, the decrements of amplified differential output voltage also increase in case of the sensor module that has a hydrophobic film on the reflectors. Figure 3 shows the normalized absorbance of infrared light [7] as a function of CO2 concentrations at 298 K. As presented in Figure 3, the sensor module that has the reflectors deposited with a hydrophobic film shows a larger absorbance (high sensitivity) than the one built with the normal reflectors. By depositing a hydrophobic Parylene-C film onto the surfaces of reflectors, the sensitivity of CO2 sensor has been improved about 10 % in this research.…”

Section: Resultsmentioning

confidence: 99%

“…In terms of absorbance of IR light at the detector [7], L. Jun et al's suggestion regarding on absorbance of IR light can be modified as Equation (3),…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Enhanced Characteristics of Nondispersive Infrared CO2 Gas Sensor by Deposition of Hydrophobic Thin Film

Kim

Lee

Lee³

et al. 2017

Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017

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This paper presents the NDIR CO2 gas sensor that has improved the sensitivity and also the accuracy by the deposition of thin hydrophobic film (Parylene-C film with 0.5 micrometer thick) onto the reflector surfaces of White-cell structure. After deposition of hydrophobic thin film, the sensitivity of sensor has been increased with averaged 10% and the estimated errors were reduced within 13 ppm to 143 ppm from 254 K to 324 K temperature ranges and from 0 ppm to 5000 ppm CO2 concentrations.

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“…L. Jun et al [5] suggested the absorbance Fa, to estimate the concentration of target gas, is as described in Equation (3) ( 3) where, Vo is the output voltage of gas sensor at certain temperature and gas concentrations, Vr is the output voltage of reference sensor at the same condition, and Z is the voltage ratio of Vo and Vr at zero ppm and a specific temperature.…”

Section: Theoretical Considerationsmentioning

confidence: 99%

IR Absorbance as a Criterion for Temperature Compensation in Nondispersive Infrared Gas Sensor

Kim

Park

2018

Eurosensors 2018

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Nondispersive infrared (NDIR) CO2 gas sensor was developed by using White-cell structure and tried to compensate the temperature effects in order to monitor CO2 concentrations without hindering the temperature variations. However, the absorptions of infrared light depend on not only the temperatures but also CO2 concentrations. Thus, a single Beer-Lambert law couldn't properly describe the tendency of voltage decrements within full scale input (FSI, 0 to 5000 ppm) because it was affected by both parameters. In this article, the absorbance of infrared light is defined according to the concentrations of CO2 gas. Then, a new temperature compensation algorithm has been implemented into micro-controller unit (MCU), the measurement errors were within ±3.6% as the temperature-dependent absorbance was chosen at 1450 ppm CO2 concentrations.

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Miniature low-power IR monitor for methane detection

Cited by 53 publications

References 23 publications

Mid-infrared fiber lasers at and beyond 35 μm using dual-wavelength pumping

Mid-infrared fiber lasers at and beyond 35 μm using dual-wavelength pumping

Enhanced Characteristics of Nondispersive Infrared CO2 Gas Sensor by Deposition of Hydrophobic Thin Film

IR Absorbance as a Criterion for Temperature Compensation in Nondispersive Infrared Gas Sensor

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