Ammonia monitoring at ppb level using photoacoustic spectroscopy for environmental application

Huszár, Helga; Pogány, Andrea; Bozóki, Zoltán; Mohácsi, Árpád; Horváth, László; Szabó, Gábor

doi:10.1016/j.snb.2008.05.013

Cited by 69 publications

(48 citation statements)

References 28 publications

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“…The assessment of the cross sensitivity to other amine containing compounds is in progress. When compared with other ammonia optical sensors [46] the developed LPG device shows similar detection levels to coulorometric [47] and absorption spectroscopy [48] devices. In particular, the current LPG optical fibre sensor modified with a mesoporous thin film offers unique advantages such as versatile chemical infusion of various chemicals into the mesopores, fast response time owing to the easy analyte penetration and robustness.…”

Section: Ammonia Sensingmentioning

confidence: 80%

Optical Fibre Long-Period Gratings Functionalised with Nano-Assembled Thin Films: Approaches to Chemical Sensing

Korposh¹,

James²,

Tatam³

et al. 2013

Current Trends in Short- And Long-Period Fiber Gratings

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Section: Ammonia Sensingmentioning

confidence: 80%

Optical Fibre Long-Period Gratings Functionalised with Nano-Assembled Thin Films: Approaches to Chemical Sensing

Korposh¹,

James²,

Tatam³

et al. 2013

Current Trends in Short- And Long-Period Fiber Gratings

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“…The gas sensor was used primarily for NH 3 concentration measurements. An NH 3 sensor based on the combination of resonant photo acoustic spectroscopy and direct absorption spectroscopy techniques with a DFB laser diode operating at 1532 nm, was also described [18]. Another photo acoustic spectroscopy sensor using a laser diode emitting near 1532 nm, combined with an erbium-doped fiber amplifier, was developed for NH 3 trace gas analysis at atmospheric pressure [19].…”

Section: Introductionmentioning

confidence: 99%

Ammonia sensing system based on wavelength modulation spectroscopy

et al. 2015

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A sensing system in the near infrared region has been developed for ammonia sensing based on the wavelength modulation spectroscopy (WMS) principle. The WMS is a rather sensitive technique for detecting atomic/molecular species, presenting the advantage that it can be used in the near-infrared region by using the optical telecommunications technology. In this technique, the laser wavelength and intensity were modulated by applying a sine wave signal through the injection current, which allowed the shift of the detection bandwidth to higher frequencies where laser intensity noise was typically lower. Two multi-pass cells based on free space light propagation with 160 cm and 16 cm of optical path length were used, allowing the redundancy operation and technology validation. This system used a diode laser with an emission wavelength at 1512.21 nm, where NH 3 has a strong absorption line. The control of the NH 3 gas sensing system, as well as acquisition, processing and data presentation was performed.

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“…Many teams across the world are currently working with this technique. One can cite the Sigrist team from Switzerland currently developing, for example, the Differential Mode Excitation PhotoAcoustic (DEM-PA) technique [1], the Harren team from the Netherlands working with Optical Parametric Oscillators (OPOs) [2], the Tittel team developing the Quartz Enhanced PhotoAcoustic Sensor (QEPAS) [2,3], the Hess team from Germany [4], the Szabo team from Hungary [5,6], the Kauppinen team from Finland currently developing the cantilever system [7], the Ponomarev team from Tomsk -Russia [8], or the Li team from China [9]. The PA technique for trace gas detection consists of sending modulated radiation into a sample gas cell containing a microphone.…”

mentioning

confidence: 99%

Photoacoustic spectroscopy for trace gas detection with cryogenic and room-temperature continuous-wave quantum cascade lasers

et al. 2010

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Abstract:The main characteristics that a sensor must possess for trace gas detection and pollution monitoring are high sensitivity, high selectivity and the capability to perform in situ measurements. The photacoustic Helmholtz sensor developed in Reims, used in conjunction with powerful Quantum Cascade Lasers (QCLs), fulfils all these requirements. The best cell response is # 1200 V W −1 cm and the corresponding ultimate sensitivity is j 3.3×10 −10 W cm −1 Hz −1/2 . This efficient sensor is used with mid-infrared QCLs from Alpes Lasers to reach the strong fundamental absorption bands of some atmospheric gases. A first cryogenic QCL emitting at 7.9 µm demonstrates the detection of methane in air with a detection limit of 3 ppb. A detection limit of 20 ppb of NO in air is demonstrated using another cryogenic QCL emitting in the 5.4 µm region. Real in-situ measurements can be achieved only with room-temperature QCLs. A room-temperature QCL emitting in the 7.9 µm region demonstrates the simultaneous detection of methane and nitrous oxide in air (17 and 7 ppb detection limit, respectively). All these reliable measurements allow the estimated detection limit for various atmospheric gases using quantum cascade lasers to be obtained. Each gas absorbing in the infrared may be detected at a detection limit in the ppb or low-ppb range. PACS (2008):07.07.Df; 07.88.+y Keywords:photoacoustic spectroscopy • quantum cascade laser • infrared gas detection

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Ammonia monitoring at ppb level using photoacoustic spectroscopy for environmental application

Cited by 69 publications

References 28 publications

Optical Fibre Long-Period Gratings Functionalised with Nano-Assembled Thin Films: Approaches to Chemical Sensing

Optical Fibre Long-Period Gratings Functionalised with Nano-Assembled Thin Films: Approaches to Chemical Sensing

Ammonia sensing system based on wavelength modulation spectroscopy

Photoacoustic spectroscopy for trace gas detection with cryogenic and room-temperature continuous-wave quantum cascade lasers

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