2014
DOI: 10.5194/amtd-7-6359-2014
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Dual channel photoacoustic hygrometer for airborne measurements: background, calibration, laboratory and in-flight inter-comparison tests

Abstract: Abstract. This paper describes a tunable diode laser based dual channel photoacoustic (PA) humidity measuring system called WaSul-Hygro primarily designed for aircraft based environment research. It is calibrated for total pressures and water vapor (WV) volume mixing ratios (VMRs) possible during airborne applications. WV VMR is calculated by using pressure dependent calibration curves and a cubic spline interpolation method. Coverage of the entire atmospheric humidity concentration range which might be encoun… Show more

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Cited by 3 publications
(6 citation statements)
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“…In recent years the number of reported photoacoustic (PA) instruments to prove their applicability in various areas has been steadily increasing [1][2][3][4]. Amongst these instruments are those which were developed by our research group for various applications, including in the natural gas industry [5][6][7], airborne hygrometry [8][9], source apportionment of urban light-absorbing aerosols [10][11], measurements of gas permeability [12], and clinical research [13]. The main components of our instruments are basically always the same: a data acquisition and control system (DACS), one or more longitudinal differential detection cells [14], (a) modulated light source(s) which is/are either telecommunication-type diode lasers [15] or frequency converted Nd:YAG lasers [10] and gas handling units in various configurations.…”
Section: Motivationmentioning
confidence: 99%
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“…In recent years the number of reported photoacoustic (PA) instruments to prove their applicability in various areas has been steadily increasing [1][2][3][4]. Amongst these instruments are those which were developed by our research group for various applications, including in the natural gas industry [5][6][7], airborne hygrometry [8][9], source apportionment of urban light-absorbing aerosols [10][11], measurements of gas permeability [12], and clinical research [13]. The main components of our instruments are basically always the same: a data acquisition and control system (DACS), one or more longitudinal differential detection cells [14], (a) modulated light source(s) which is/are either telecommunication-type diode lasers [15] or frequency converted Nd:YAG lasers [10] and gas handling units in various configurations.…”
Section: Motivationmentioning
confidence: 99%
“…In most cases, the DACS has various additional functions such as controlling the gas handling system and communicating with other instruments. Our recently developed systems [5][6][7][8][9][10][11][12][13] were based on a highly integrated target DACS. This system turned out to be one of the bottlenecks during the application developments due to its limited capabilities; therefore, a fundamental redesign of our DACS became essential.…”
Section: Motivationmentioning
confidence: 99%
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“…Ez az érték közelítőleg 2,5 nagyságrenddel nagyobb, mint az longitudinális rezonátort tartalmazó, zárt kamrával rendelkező fotoakusztikus mérőrendszerek által tipikusan mérhető legkisebb kimutatható koncentráció [25]. Egy nagyságrendnyi különbség abból az összefüggésből következik, hogy a fotoakusztikus mérések zaja (σ) fordítottan arányos a mérés átlagolási idejének (τ) négyzetgyökével, azaz:…”
Section: áBra: Fotoakusztikus Jel a Vízgőz-koncentráció Függvényébenunclassified