Hearing light from an incandescent bulb

Zhu, Zheyuan; Du, Lidong; Zhang, Youtian; Wang, Sihui; Zhou, Huijun; Gao, Wenli

doi:10.1088/0143-0807/36/1/015003

Cited by 3 publications

(6 citation statements)

References 14 publications

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“…7, which shows that the photo-acoustic signal is rather strong. In accordance with the findings of Zhu et al, 5 it can be seen that the sound pressure level decays over time, as a result of an increase of the mean temperature of the soot layer and the air enclosed in the soot and above the soot layer. The effect is less than 2 dB in this experiment, which would infer a global temperature rise from room temperature T 0 =293 K to 10 (2/20) • T 0 = 1.26 • 293 = 369 K or 100 deg Celsius.…”

Section: Acoustic Measurement Resultssupporting

confidence: 91%

“…Numerical simulations are used to optimize the geometry of the device. Similar to the findings of Bell, 2 Rush et al 4 and Zhu et al, 5 experiments indicate that the photoacoustic effect is strongly increased by means of a layer of soot (carbon black). The layer of soot has two functions.…”

Section: Introductionsupporting

confidence: 75%

“…without horn) are discussed to elucidate the importance of the soot layer. Also the saturation effect that was found by Zhu et al, 5 and its importance with respect to the Heliophone, will be discussed.…”

Section: A Laboratory Measurements Closed Photoacoustic Cellmentioning

confidence: 82%

“…Very recently (2015), Zhu et al 5 described a photoacoustic device to turn the oscillating light from an incandescent light bulb into audible sound. The light bulb was driven by a sinusoidal AC power source with constant frequency of 50 Hz, as well as by a square-wave chopped DC source with adjustable frequencies.…”

Section: Introductionmentioning

confidence: 99%

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Converting sunlight into audible sound by means of the photoacoustic effect: The Heliophone

Roozen

Glorieux

Liu

et al. 2016

The Journal of the Acoustical Society of America

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One hundred and thirty-five years after Alexander Graham Bell and his assistant Charles Sumner Tainter explored the photoacoustic effect, and about 40 years after Rosencwaig and Gersho modeled the effect in a photoacoustic cell configuration, the phenomenon is revisited in a "Heliophone" device that converts sunlight into sound. The light is focused on a carbon blackened copper coated Kapton foil in an acoustic cell by means of a compound parabolic collimator, and its intensity is modulated by a mechanical chopper. A horn is employed to make the sound audible without electronic amplification. The description of the photoacoustic effect that was introduced by Rosencwaig and Gersho is extended to a cell-horn configuration, in which the periodically heated air above the foil acts as an oscillating piston, driving acoustic waves in the horn. The pressure in the cavity-horn assembly is calculated by considering the air layer piston as an equivalent volume velocity source. The importance of the carbon black (soot) layer to enhance light absorption, but above all to enhance the photothermal excitation efficiency, is elucidated by means of an experimentally supported physical model.

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Section: Acoustic Measurement Resultssupporting

confidence: 91%

Section: Introductionsupporting

confidence: 75%

Section: A Laboratory Measurements Closed Photoacoustic Cellmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Converting sunlight into audible sound by means of the photoacoustic effect: The Heliophone

Roozen

Glorieux

Liu

et al. 2016

The Journal of the Acoustical Society of America

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“…In past years, photoacoustic (PA) phenomena have been investigated and explored extensively. As photoacoustics can be generated in a simple and easy way, its applications can be found in many fields of research [1][2][3][4][5][6]. Within infrared spectroscopy, photoacoustics is used for the detection of greenhouse gases.…”

Section: Introductionmentioning

confidence: 99%

Phasor representation for the nonlinear photoacoustic signal

Santosa¹,

Oetama²,

Harren³

2017

Eur. J. Phys.

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Article 25fa pilot End User Agreement This publication is distributed under the terms of Article 25fa of the Dutch Copyright Act (Auteurswet) with explicit consent by the author. Dutch law entitles the maker of a short scientific work funded either wholly or partially by Dutch public funds to make that work publicly available for no consideration following a reasonable period of time after the work was first published, provided that clear reference is made to the source of the first publication of the work. This publication is distributed under The Association of Universities in the Netherlands (VSNU) 'Article 25fa implementation' pilot project. In this pilot research outputs of researchers employed by Dutch Universities that comply with the legal requirements of Article 25fa of the Dutch Copyright Act are distributed online and free of cost or other barriers in institutional repositories. Research outputs are distributed six months after their first online publication in the original published version and with proper attribution to the source of the original publication. You are permitted to download and use the publication for personal purposes. All rights remain with the author(s) and/or copyrights owner(s) of this work. Any use of the publication other than authorised under this licence or copyright law is prohibited. If you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons.

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Music-of-light stethoscope: a demonstration of the photoacoustic effect

et al. 2016

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In this paper we present a system aimed at demonstrating the photoacoustic (PA) effect for educational purposes. PA imaging is a hybrid imaging modality that requires no contrast agent and has a great potential for spine and brain lesion characterisation, breast cancer and blood flow monitoring notably in the context of fetal surgery. It relies on combining light excitation with ultrasound reception. Our brief was to present and explain PA imaging in a public-friendly way suitable for a variety of ages and backgrounds.We developed a simple, accessible demonstration unit using readily available materials. We used a modulated light emitting diode (LED) torch and an electronic stethoscope. The output of a music player was used for light modulation and the chest piece of the stethoscope covered by a black tape was used as an absorbing target and an enclosed chamber.This demonstration unit was presented to the public at the Bloomsbury Festival On Light in October 2015. Our stall was visited by over 100 people of varying ages. Twenty families returned in-depth evaluation questionnaires, which show that our explanations of the photoacoustic effect were well understood. Their interest in biomedical engineering was increased.

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Hearing light from an incandescent bulb

Cited by 3 publications

References 14 publications

Converting sunlight into audible sound by means of the photoacoustic effect: The Heliophone

Converting sunlight into audible sound by means of the photoacoustic effect: The Heliophone

Phasor representation for the nonlinear photoacoustic signal

Music-of-light stethoscope: a demonstration of the photoacoustic effect

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