Photoacoustic spectrometry for trace gas analysis and leak detection using different cell geometries

Gondal, M.A.; Dastageer, M.A.; Shwehdi, M.H.

doi:10.1016/s0039-9140(03)00418-1

Cited by 27 publications

(13 citation statements)

References 12 publications

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“…We evaluated the LIBS method for its potential to measure the concentration of soil nutrients in green house samples collected from different locations of selected green house plot. The development of the LIBS system for environmental and other analytical applications such as monitoring of nutrients in green house soil samples is a continuity of our group activities for development of laser based pollution monitoring systems like Photoacoustic (Gondal, 1997;Gondal et al, 2001Gondal et al, , 2004 and LIDAR system (Gondal et al, 2000.…”

Section: Introductionmentioning

confidence: 99%

Measurement Of Nutrients In Green House Soil With Laser Induced Breakdown Spectroscopy

Hussain

Gondal

Yamani

et al. 2006

Environ Monit Assess

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Laser-induced breakdown spectroscopy (LIBS) has been applied for the determination of nutrients in the green house soil samples. We determined appropriate spectral signatures of vital nutrients and calibrated the method to measure the nutrients in a naturally fertilized plot, cultivated with tomato and cucumber plants. From the calibration curves we predicted the concentrations of important nutrients such as Ca, K, P, Mg, Fe, S, Ni and Ba in the soil. Our measurements proved that the LIBS method rapidly and efficiently measures soil nutrients with excellent detection limits of 12, 9, 7, 9, 7, 10, 8 and 12 mg/kg for Ca, K, P, Mg, Fe, S, Ni and Ba respectively with a precision of approximately 2%, The unique features of LIBS for rapid sample analysis demonstrated by this study suggests that this method offers promise for precision measurements of soil nutrients as compared to conventional methods in short span of time.

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Section: Introductionmentioning

confidence: 99%

Measurement Of Nutrients In Green House Soil With Laser Induced Breakdown Spectroscopy

Hussain

Gondal

Yamani

et al. 2006

Environ Monit Assess

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“…An essential parameter for the detection of gas traces is the sensitivity achieved by the system, which is mainly affected by the system noises. It is determined by the signal‐to‐noise ratio (SNR) of the known gas concentrations 20: where c min is the sensitivity of the system, c is the known gas concentration. When the laser output power is 13.7 mW and the C 2 H 2 concentration is 100 µl/l, the system noise level is 1.5 µU.…”

Section: Quantitative Analysis Of Acetylene Gas Photoacoustic Spectromentioning

confidence: 99%

Diode laser‐based photoacoustic spectroscopy detection of acetylene gas and its quantitative analysis

Chen

Liu

Zhou

et al. 2011

Int Trans Elec Energy Syst

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SUMMARY Acetylene in oil is an important characteristic gas which reflects early discharge faults of transformer and other oil‐immersed electrical equipment. Laser‐based photoacoustic spectroscopy techniques of high sensitivity and good selectivity can be well applied to detect trace gases. A portable and tunable experimental setup with a distributed feedback diode laser has been developed in this paper. The photoacoustic cell property parameters, the relationships between the photoacoustic signals and the laser power and the acetylene gas concentrations were analysed experimentally. By means of diode laser wavelength modulation, the high‐resolution acetylene photoacoustic spectrum near 1.5 µm in the first overtone band near infrared was investigated. A novel method of photoacoustic quantitative analysis was proposed on the basis of least square regression. The theoretical and experimental results show the feasibility of on‐line monitoring of acetylene and designing a tunable photoacoustic spectrometer with high sensitivity. Copyright © 2011 John Wiley & Sons, Ltd.

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“…Lewicki et al [11] designed a 2 m diode laser-based quartzenhanced photoacoustic spectroscopy system for carbon dioxide and ammonia detection. Due to the advantages of high sensitivity and accuracy, rapid detection speed, longterm stability, and no gas separation and consumption [12,13], PAS would be a promising detection technology for dissolved fault characteristic gases in transformer oil, such as hydrogen, carbon monoxide, methane, ethane, ethylene, and acetylene [3].…”

Section: Introductionmentioning

confidence: 99%

Detection of Dissolved Carbon Monoxide in Transformer Oil Using 1.567 μm Diode Laser-Based Photoacoustic Spectroscopy

Zhou

Tang

Zhu

et al. 2015

Journal of Spectroscopy

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Carbon monoxide (CO) is one of the most important fault characteristic gases dissolved in power transformer oil. With the advantages of high sensitivity and accuracy, long-term stability, and short detection time, photoacoustic spectroscopy (PAS) has been proven to be one promising sensing technology for trace gas recognition. In this investigation, a tunable PAS experimental system based on a distributed-feedback (DFB) diode laser was proposed for recognizing dissolved CO in transformer oil. The molecular spectral line of CO gas detection was selected at 1.567 m in the whole experiment. Relationships between the photoacoustic (PA) signal and gas pressure, temperature, laser power, and CO gas concentration were measured and discussed in detail, respectively. Finally, based on the least square regression theory, a novel quantitative identification method for CO gas detection with the PAS experimental system was proposed. And a comparative research about the gas detection performances performed by the PAS system and gas chromatography (GC) measurement was presented. All results lay a solid foundation for exploring a portable and tunable CO gas PAS detection device for practical application in future.

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Photoacoustic spectrometry for trace gas analysis and leak detection using different cell geometries

Cited by 27 publications

References 12 publications

Measurement Of Nutrients In Green House Soil With Laser Induced Breakdown Spectroscopy

Measurement Of Nutrients In Green House Soil With Laser Induced Breakdown Spectroscopy

Diode laser‐based photoacoustic spectroscopy detection of acetylene gas and its quantitative analysis

Detection of Dissolved Carbon Monoxide in Transformer Oil Using 1.567 μm Diode Laser-Based Photoacoustic Spectroscopy

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