Open-cell photoacoustic radiation detector

Silva, M D da; Bandeira, I. N.; Miranda, L. C. M.

doi:10.1088/0022-3735/20/12/009

Cited by 62 publications

(39 citation statements)

References 8 publications

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“…Pressure changes in the microphone cavities are reflected by voltage signals U M1 and U M2 . Similar models were already used in previous studies, and they were proven to give results very close to the measurements [2,9,14,23], so they can be considered as a reliable source of information on the real cell behavior.…”

Section: Modeling Methodsmentioning

confidence: 54%

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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: Modeling Methodsmentioning

confidence: 54%

“…Photoacoustic spectroscopy (PAS) is a technique commonly used for continuous flow measurements [1][2][3][4][5][6][7]. One of the most important components of any PAS setup is the photoacoustic cell.…”

Section: Introductionmentioning

confidence: 99%

Parametric Analysis of a Differential Photoacoustic Helmholtz Cell

Geras

Starecki

2014

Int J Thermophys

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“…To amplify the signal, the acoustic resonance of the chamber may be used. There are a number of open windowless cells reported in the literature, and in most cases, signal amplification is based on the standing wave resonances [1][2][3][10][11][12][13][14]. Such cells are usually of relatively large volumes, so their applications are strongly limited.…”

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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“…Los más sencillos están basados en efectos calorimétricos, miden la radiación láser absorbida utilizando termopilas y termocuplas [1,2]. Otros, basándose en el efecto fotoacústico han construido sensores de energía o potencia de láseres continuos o pulsados denominados celdas fotoacústicas cerradas y abiertas, los cuales utilizan micrófonos tipo electreto como receptores de ondas acústicas [3][4][5][6][7]. Además existen otros medidores que también se basan en el efecto fotoacústico pero utilizan como detector a sensores piezoeléctricos.…”

Section: Introductionunclassified

Detector De Energía De Pulsos Láser Infrarrojo Basado en El Efecto Fotoacústico

Aldama-Reyna¹,

Aldama-Guardia²,

Agreda-Delgado³

2018

Momento

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ResumenSe reporta la respuesta fotoacústica de un sensor piezoeléctrico que fue irradiado con pulsos láser de longitud de onda de 1064 nm y distinta energía emitidos por un láser Nd:YAG. La medida de la energía de los pulsos láser se hizo con un medidor, marca Newport modelo 1936-R con sensor piroeléctrico y las señales fotoacústicas con un osciloscopio Tektronix, modelo DPO3054 de 500 MHz. Experimentalmente se encontró una dependencia lineal entre la intensidad de la señal fotoacústica del sensor piezoeléctrico y la energía del pulso láser. La sensibilidad de la respuesta fotoacústica del sensor fue dependiente de la placa protectora. Para placas de aluminio y aluminio pintado de negro fueron (6.52 ± 0.06)mV /mJ y (51.2 ± 1.5)mV /mJ respectivamente. Se concluyó que este tipo de sensor piezoeléctrico es muy sensible a los cambios de energía de láseres pulsados de 1064 nm, su respuesta es directamente proporcional a la energía incidente, es apropiado para mediciones de energía de láseres pulsados en tiempo real y, no se ve afectado por ruidos acústicos ni condiciones de iluminación del laboratorio.

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Open-cell photoacoustic radiation detector

Cited by 62 publications

References 8 publications

Parametric Analysis of a Differential Photoacoustic Helmholtz Cell

Parametric Analysis of a Differential Photoacoustic Helmholtz Cell

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

Detector De Energía De Pulsos Láser Infrarrojo Basado en El Efecto Fotoacústico

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