Analysis of some basic properties of multicavity photoacoustic Helmholtz cells

Starecki, Tomasz; Opalska, Katarzyna; Burd, Aleksander; Misiaszek, Stefan; Ramotowski, Michal

doi:10.1117/12.622192

Cited by 5 publications

(15 citation statements)

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“…Its principle is to transform each of the acoustic components of the cell into its electric counterpart [31][32][33]. Although this method is quite popular, its results do not always correspond precisely to those obtained from measurements [27,30]. It was found that the transmission line model gives much better information on the cell behavior [27,30].…”

Section: Modeling Methodsmentioning

confidence: 99%

“…Here, it is important to highlight that due to the pistonlike gas movement between the cavities, the excited signals are in counterphase [8,17]. It should be noted that although in the case of a Helmholtz resonator the Q-factor is low in comparison to that of other types of resonators (usually not greater than 20 [10,28]), the low volume of the cavities allows for the attainment of a high level of [14] photoacoustic signal amplitude [8,10], as it is inversely proportional to the volume of the cell, according to the formula,…”

Section: Differential Open Photoacoustic Helmholtz Cellmentioning

confidence: 99%

“…A detailed description of the principles of the Helmholtz resonator operation can be found elsewhere [10,19,27]. Here, it is important to highlight that due to the pistonlike gas movement between the cavities, the excited signals are in counterphase [8,17].…”

Section: Differential Open Photoacoustic Helmholtz Cellmentioning

confidence: 99%

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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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Section: Modeling Methodsmentioning

confidence: 99%

Section: Differential Open Photoacoustic Helmholtz Cellmentioning

confidence: 99%

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

Geras

2014

Int J Thermophys

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“…These graphs were obtained by means of loss-improved electroacoustic modeling. The method has already been tested and proven to give accurate results [17,20,25,27]. Modeling allows examination of some of the cell properties before its manufacture.…”

Section: Modeling Methodsmentioning

confidence: 99%

“…It means that the buffers, connected via ducts of a properly chosen length, should help to prevent external noise infiltration. Furthermore, it was observed that dimensions of the ducts and buffers have a noticeable impact on the external noise attenuation and that their proper selection can significantly improve cell properties [1,25]. An important measure, which indicates a level of sensitivity that can be obtained with a given open cell design, is its ability to attenuate external acoustic noise, which can be expressed by the signal-to-noise ratio.…”

Section: Open Photoacoustic Helmholtz Cellmentioning

confidence: 99%

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

Geras

2014

Int J Thermophys

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Open photoacoustic cells are often used in continuous-flow photoacoustic measurements. Such cells are sensitive to external noise penetration. The improved open photoacoustic Helmholtz cell has much better external noise attenuation than the previously known designs. This paper describes how mechanical dimensions of such a cell influence its signal-to-noise 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 affect signal-to-noise noticeably and, if they are properly chosen and applied in the design of the improved open cell, the resulting signal-to-noise ratio may be improved by almost 60 dB in comparison to previous designs of open photoacoustic Helmholtz cells.

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Windowless Open Photoacoustic Helmholtz Cell

Starecki

2008

Acta Phys. Pol. A

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A phenomenon which is usually considered as the main disadvantage of photoacoustic Helmholtz cells is photoacoustic background signal resulting from the light absorption by the cell windows. Although there are methods which reduce this background signal, e.g. light wavelength modulation or time domain filtering of the photoacoustic response from the sample, the methods are limited to particular applications, and none of them would completely remove the mentioned background signal. The paper presents design of a windowless open photoacoustic Helmholtz cell, and preliminary results of frequency response measurements of such a cell. Removal of the windows eliminated the main source of the photoacoustic background signal. Additionally, the proposed design allows for unrestricted or forced flow of the fluid filling the cell. As a result, the cell can be easily adapted for continuous, real-time photoacoustic measurements. Under proper selection of the cell dimensions, Q-factors of such open photoacoustic Helmholtz resonators are comparable to the Q-factors of corresponding closed Helmholtz cells.

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Analysis of some basic properties of multicavity photoacoustic Helmholtz cells

Cited by 5 publications

References 0 publications

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

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

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

Windowless Open Photoacoustic Helmholtz Cell

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