Differential Helmholtz resonant photoacoustic cell for spectroscopy and gas analysis with room-temperature diode lasers

Song, Kyuseok; Cha, Hanju; Kapitanov, V. A.; Ponomarev, Yu. N.; Rostov, Andrey P.; Courtois, D.; Parvitte, B.; Zéninari, V.

doi:10.1007/s00340-002-1000-y

Cited by 30 publications

(15 citation statements)

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“…Open cells presented in the literature [8][9][10][11] are susceptible to external acoustic noise penetration, which can seriously limit the sensitivity of the photoacoustic instrument [5]. Solving this problem may allow for wider use of this kind of photoacoustic cells in continuous flow measurements [7,[12][13][14]. So far, the best values of the external acoustic noise suppression obtained in such cells were reported at a level of approximately 40 dB to 50 dB [15,16].…”

Section: Introductionmentioning

confidence: 99%

“…Differential detection is well known for its strong noise attenuation properties [13,18,19]. The cell design is symmetrical in order to obtain nearly identical penetration of the external acoustic noise into both cavities.…”

Section: Introductionmentioning

confidence: 99%

“…The cell design is symmetrical in order to obtain nearly identical penetration of the external acoustic noise into both cavities. Hence, subtraction of the signals from both cavities should virtually cancel the external acoustic noise signal components, while doubling the photoacoustic signal component, as in the Helmholtz cell working at the resonance frequency, pressure changes in the cavities are in counterphase [13,14,20].…”

Section: Introductionmentioning

confidence: 99%

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Parametric Analysis of a Differential Photoacoustic Helmholtz Cell

Geras

Starecki

2014

Int J Thermophys

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The paper describes how mechanical dimensions of a differential open photoacoustic Helmholtz cell affect its operation. The influence of the diameter and length of the internal and external ducts and the volume of the acoustic buffers on the frequency response of the cell, as well as on the attenuation of the external acoustic noise, was studied. The analysis was performed by means of computer simulations based on a model in which loss-corrected transmission line duct definitions were used. The results showed that under proper selection of the cell dimensions, its frequency response at the frequencies around the main resonance is nearly identical as in the case of the conventional, closed Helmholtz resonator. The length of the ducts is only slightly related to the frequency of resonance, and does not noticeably affect the Qfactor of the cell. A decrease of the duct diameters and an increase of the buffer volumes improve attenuation of the external acoustic noise. It should be possible to obtain external acoustic noise rejection as high as 80 dB, which is a substantial improvement in comparison to the previous designs, which reported this value at the level of 40 dB to 50 dB.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Parametric Analysis of a Differential Photoacoustic Helmholtz Cell

Geras

Starecki

2014

Int J Thermophys

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“…A well-known solution to this problem is to use acoustic buffers for external noise attenuation [16]. Another method, which seems particularly promising, is differential detection, since it allows for doubling the signal amplitude with simultaneous strong noise reduction [17][18][19]. A differential open Helmholtz cell was proposed by Starecki and Geras [20].…”

Section: Introductionmentioning

confidence: 99%

“…This measure is a common criteria for evaluation of the sensitivity of measurement instruments [10,21]. Some remarks on how the dimensions of differential cells influence the frequency response can be found in the literature [17,19]. However, none of these reports contains a full analysis of all of the parameters' influences and their interactions.…”

Section: Introductionmentioning

confidence: 99%

Signal-to-Noise Analysis of the Differential Open Photoacoustic Helmholtz Cell

Geras

2014

Int J Thermophys

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When open photoacoustic cells are considered, attenuation of external noise is a serious issue. This paper describes how mechanical dimensions of a differential open photoacoustic Helmholtz cell influence its signal-to-noise (S/N) ratio. The analysis was performed by means of computer simulations based on the loss-improved transmission line model. This research showed that the mechanical parameters noticeably affect the signal-to-noise ratio. According to the presented results, optimal selection of the dimensions is a factor which can substantially improve the signal-to-noise ratio of the examined photoacoustic cell. Due to the very good acoustic properties of the cell, it should be possible to obtain an S/N ratio of over 100 dB.

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