Thermo acoustic study of carbon nanotubes in near and far field: Theory, simulation, and experiment

Traditional sound sources and sound detectors are usually independent and discrete in the human hearing range. To minimize the device size and integrate it with wearable electronics, there is an urgent requirement of realizing the functional integration of generating and detecting sound in a single device. Here we show an intelligent laser-induced graphene artificial throat, which can not only generate sound but also detect sound in a single device. More importantly, the intelligent artificial throat will significantly assist for the disabled, because the simple throat vibrations such as hum, cough and scream with different intensity or frequency from a mute person can be detected and converted into controllable sounds. Furthermore, the laser-induced graphene artificial throat has the advantage of one-step fabrication, high efficiency, excellent flexibility and low cost, and it will open practical applications in voice control, wearable electronics and many other areas.

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“…The core of thermal acoustic is the propagation of the heat. SP is decided by the thermal energy diffused into air: 42 …”

Section: Resultsmentioning

confidence: 99%

An intelligent artificial throat with sound-sensing ability based on laser induced graphene

et al. 2017

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“…Nevertheless, most of the latest studies focused on the evaluation of the performance enabled by the new materials, often overlooking the physical phenomena underlying TA sound generation. While the full electro-acoustic transduction of TA loudspeakers is widely documented in the literature [ 1 , 11 , 12 , 13 , 14 , 15 , 16 , 17 ], the thermal response of TA loudspeakers to the applied electrical stimuli and its role in determining the acoustic response were investigated superficially in the past.…”

Section: Introductionmentioning

confidence: 99%

On the Frequency Response of Nanostructured Thermoacoustic Loudspeakers

Torraca

Bobinger

Servadio³

et al. 2018

Nanomaterials

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In this work, we investigate the thermal and acoustic frequency responses of nanostructured thermoacoustic loudspeakers. An opposite frequency dependence of thermal and acoustic responses was found independently of the device substrate (Kapton and glass) and the nanometric active film (silver nanowires and nm-thick metal films). The experimental results are interpreted with the support of a comprehensive electro-thermo-acoustic model, allowing for the separation of the purely thermal effects from the proper thermoacoustic (TA) transduction. The thermal interactions causing the reported opposite trends are understood, providing useful insights for the further development of the TA loudspeaker technology.

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“…Therefore, the shutter patterned E‐skin could possess broad application prospects in health monitoring and alarm owning to the optimally overall performance. We have confirmed that there are great differences for SPL based on different patterns, and these results can be explained by the following theoretical formula

{normalP}_{rms} = \frac{m_{air} \cdot f}{2 \sqrt{2 C_{normalp} T_{normal0} r}} \cdot {\overset{Q}{true}}_{air}

where P rms is the root‐mean‐square sound pressure, m air is the molecular weight of air, f is the frequency of the acoustic, C p is the heat capacity under constant pressure, T 0 is the room temperature, r is the distance between the sound source and the microphone, and Q air is the thermal energy diffused into the air.…”

Section: Resultsmentioning

confidence: 99%

A Dual‐Functional Graphene‐Based Self‐Alarm Health‐Monitoring E‐Skin

Chen

Luo

Yuan

et al. 2019

Adv Funct Materials

100

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Diseases such as cardiovascular problems and sleep apnea cause mass deaths annually due to a lack of timely and portable monitoring and alarm measures. Various wearable devices for health monitoring have been intensely researched to reduce mortality. However, these devices themselves can only detect physiological signals; they cannot sound an alarm. Therefore, they must rely on mobile phones or other peripheral devices such as speakers or vibration motors to sound an alarm, which may result in a patient missing the optimal treatment. It is valuable to develop a self-alarm health monitoring device with the dual functions of physiological signal detection and sound alarm simultaneously. A one-step laser-induced graphene (LIG)based electronic skin (E-skin) is fabricated to perform health monitoring and alarm at the same time, which benefit from its both excellent mechanical and acoustical performance. These customized shutter-patterned E-skins have an ultrahigh sensitivity of 316.3 and can detect various biosignals such as wrist pulse, respiratory, etc. They also have a self-alarm function and can sound an alarm when detecting abnormal situations. This study addresses the multifunctional integration required for multisensors, which will open further applications in wearable sensors and health-care devices.

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Thermo acoustic study of carbon nanotubes in near and far field: Theory, simulation, and experiment

Cited by 36 publications

References 19 publications

An intelligent artificial throat with sound-sensing ability based on laser induced graphene

An intelligent artificial throat with sound-sensing ability based on laser induced graphene

On the Frequency Response of Nanostructured Thermoacoustic Loudspeakers

A Dual‐Functional Graphene‐Based Self‐Alarm Health‐Monitoring E‐Skin

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