Cavity Enhanced Absorption Spectroscopy Sensor

Nowakowski, M.; Wojtas, J.; Bielecki, Z.; Mikołajczyk, J.

doi:10.12693/aphyspola.116.363

Cited by 9 publications

(6 citation statements)

References 10 publications

(7 reference statements)

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“…NO 2 can be well detected with blue violet lasers (0.4-0.42 µm). Such approach was already demonstrated by several laboratories [10][11][12][13][14][15]. Mean value of the absorption cross--section in this region reaches about 6 × 10 −19 cm 2 .…”

Section: Introductionmentioning

confidence: 73%

Application of Quantum Cascade Lasers in Nitric Oxide and Nitrous Oxide Detection

et al. 2011

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Application of quantum cascade lasers in NO and N2O sensor is described. Cavity enhanced absorption spectroscopy was used for this purpose. The detection was performed at vibronic molecular transitions in spectral regions of 5.23-5.29 µm and 4.46-4.54 µm for NO and N2O, respectively. In order to avoid interferences by the gases contained in atmosphere (H2O, CO2) the lines of 5.263 µm for NO and 4.530 µm for N2O were selected. Our two channel sensor is designated for simultaneous detection of both compounds. Each channel consists of single mode quantum cascade laser, optical cavity, and a photodetection module. The lasers were precisely tuned to the wavelength of interest. Optical cavities were built with spherical mirrors of high reflectance. The signals from the cavities outputs were registered with specially developed low noise detection modules.

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Section: Introductionmentioning

confidence: 73%

Application of Quantum Cascade Lasers in Nitric Oxide and Nitrous Oxide Detection

et al. 2011

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“…Some successful research with nitrogen dioxide sensor to detect nitroglycerine and nitrocellulose has been already performed. CEAS technique with blue violet laser diodes was applied [9,16,17]. We expect that an additional channel, i.e.…”

Section: Discussionmentioning

confidence: 99%

N₂O detection with the CEAS method

Wojtas¹,

Rutecka²,

Stacewicz³

et al. 2011

Computational Methods and Experimental Measurements XV

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Nitrous oxide (N 2 O) plays a significant role in many different fields therefore its monitoring is an important task. In this paper the opportunity of application of cavity enhanced absorption spectroscopy for N 2 O detection is presented. This method is a modification of cavity ring down spectroscopy. The laser radiation tuned to absorption line of N 2 O is injected into an optical cavity under a very small angle in respect to its axis. In the case of lack of the absorption, the result is determined by the mirrors reflectivity coefficient, diffraction losses and length of the cavity. When the absorber is present in the cavity, the result additionally depends on absorption and scattering of light in cavity. The method provides the determination of a very weak absorption coefficient as well as the concentration of the absorbing gas.Our N 2 O sensor consisted of a pulsed radiation source, optical cavity, detection module and a digital oscilloscope. As the light source anoptical parametric generator was applied. It enabled the wavelength tuning in a broad spectral range with resolution of 1 nm. The optical cavity was composed of two high-reflective spherical mirrors. Optical signal registration was done with detection module equipped with HgCdTe photodetector.The spectral range of 4.52-4.53 µm is the best for N 2 O detection. Operation at these wavelengths provides opportunity avoiding of interferences with other atmosphere gases, like CO 2 and H 2 O. Assuming 2% uncertainty of measurements and the effective value of the absorption cross section of about 6·10 -19 cm 2 the detection limit of 10 ppb was achieved.

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“…where C 0 denotes the Loschmidt number, c -the light speed, σ -absorption cross-section for nitrogen dioxide at the wavelength of interest [14,15].…”

Section: Methodsmentioning

confidence: 99%

Two-Channel Optoelectronic Sensor Employing Cavity Enhanced Absorption Spectroscopy

Wojtas

2011

Acta Phys. Pol. A

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In the paper, a description of two-channel of optoelectronic sensor basing on cavity enhanced absorption spectroscopy is presented. In contrast to the typical cavity enhanced absorption spectroscopy systems, here a special optical system is applied. It provides possibility to direct more than one beam of laser radiation into a cavity. Thus, special lasers controller system and photoreceiver were developed as well. The setup includes two pulsed laser diodes. The optical signals from the lasers are registered with one special constructed photoreceiver, which is characterized by wide range of the detected wavelengths. Moreover, there was applied time division multiplexing technique, well-known in the telecommunication systems. Every laser is assigned to the suitable channel -the strictly determined temporary window. In this window, the signal from the exits of the optical cavity is registered. In the system, optical signal from many laser sources can be measured and value of absorption coefficient at a few different wavelengths can be determined parallel. Typical cavity enhanced absorption spectroscopy system is designed to measure only one gas concentration, while the developed setup provides possibility to detect a trace concentration of two gases at the same time.

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Cavity Enhanced Absorption Spectroscopy Sensor

Cited by 9 publications

References 10 publications

Application of Quantum Cascade Lasers in Nitric Oxide and Nitrous Oxide Detection

Application of Quantum Cascade Lasers in Nitric Oxide and Nitrous Oxide Detection

N₂O detection with the CEAS method

Two-Channel Optoelectronic Sensor Employing Cavity Enhanced Absorption Spectroscopy

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Cavity Enhanced Absorption Spectroscopy Sensor

Cited by 9 publications

References 10 publications

Application of Quantum Cascade Lasers in Nitric Oxide and Nitrous Oxide Detection

Application of Quantum Cascade Lasers in Nitric Oxide and Nitrous Oxide Detection

N2O detection with the CEAS method

Two-Channel Optoelectronic Sensor Employing Cavity Enhanced Absorption Spectroscopy

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N₂O detection with the CEAS method