Chip-scale optical airflow sensor

Luo, Yumeng; An, Xiaoshuai; Liang, Chen; Li, Kwai Hei

doi:10.1038/s41378-021-00335-1

Cited by 10 publications

(4 citation statements)

References 41 publications

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“…It should be noted that achieving a uniform unit conversion across all the reviewed flowmeters is challenging due to the specifics of the interrogation methods implemented in each case. As can be seen from the table, several technologies have been implemented to realize flowmeters for accurate monitoring and measurement of gas and liquid flows, including microelectromechanical (MEMS) 29 , piezoelectric 30 , electroconductive 31 , 32 and optical 6 , 7 , 33 – 35 sensors.…”

Section: Resultsmentioning

confidence: 99%

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Microfluidic flowmeter based on a liquid crystal-filled nested capillary

Wang,

Mallik,

Wei

et al. 2024

Commun Eng

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Microfluidic flowmeters are a powerful and highly accurate tool, enabling precise monitoring and measurements of flows of gases and fluids in a range of applications. Here we proposed and experimentally demonstrated a whispering gallery modes flowmeter composed of a liquid crystal-filled nested capillary. Whispering gallery modes are excited by a tapered fiber coupled perpendicularly to the nested capillary. The air flowing through the capillary cools it down, which leads to a temperature-induced change of the refractive index of the nematic liquid crystals. This change in turn leads to a spectral shift of the whispering gallery modes resonances, which can be linked to the airflow rate in the capillary. The temperature change in the liquid crystals was simulated considering the heat transfer between the liquid crystals and airflow in the capillary, which indicated that the liquid crystals temperature decreases in a nonlinear manner with the increase of the airflow rate. A flowmeter with the maximum sensitivity of 0.3423 nm·min·mL−1 in the flowrate range from 0 to 2.52 nm·min·mL−1 and a resolution of 5.72 pm was demonstrated in our experiment. The proposed sensor provides a platform for whispering gallery modes flowmeters and offers the advantages of good stability, high sensitivity, and miniature size.

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Section: Resultsmentioning

confidence: 99%

“…As can be seen from the table, several technologies have been implemented to realize flowmeters for accurate monitoring and measurement of gas and liquid flows, including microelectromechanical (MEMS) 29 , piezoelectric 30 , electroconductive 31 , 32 and optical 6 , 7 , 33 – 35 sensors.…”

Section: Resultsmentioning

confidence: 99%

Microfluidic flowmeter based on a liquid crystal-filled nested capillary

Wang,

Mallik,

Wei

et al. 2024

Commun Eng

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“…With the rapid development of science and technology and intelligence, all kinds of sensors, including temperature, [1,2] humidity, [3][4][5] air flow, [6][7][8][9] have developed explosively and been widely used in people's life and production, playing a crucial role in promoting social development. On the other hand, the fast-progressing society continues to throw higher demands on DOI: 10.1002/admi.202300077 sensors for better performance and applicability in harsh environments.…”

Section: Introductionmentioning

confidence: 99%

A Robust Bridge‐Type Airflow Sensor Based on Flexible Superhydrophobic Carbon Nanotube Fiber Thin Films

Qi,

Chen,

Yong

et al. 2023

Adv Materials Inter

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Despite a great deal of research about airflow sensors by far, it is still hard to maintain ultra‐low limit of detection, short response, and recovery time under humid and rainy environment, which compromises its practical applications. Herein, a robust bridge‐type airflow sensor base on flexible superhydrophobic carbon nanotube fiber thin films is developed, which can not only own remarkable sensitive properties with ultra‐low limit of detection, fast response, and rapid recovery, but also exclude the influence of moisture or water drops in real applications. Both response time and recovery time are reduced compared with that of the previously reported flexible carbon‐based airflow sensors. Particularly, recovery time is reduced by ≈2/3. Meanwhile, the superhydrophobic structure renders normal functioning of the sensor in severe environment of high humidity or even in the rain, so that the influence of moisture and raindrops can be excluded, a property deficient in the previously reported airflow sensors. Not only can the sensor detect ambient airflow sensitively, but it also exhibits outstanding performance in respiratory health monitoring. Hence, the novel sensor designed in this work realizes operation in the environment of high humidity and rain, which tremendously uplifts the applicability of flexible sensors.

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“…Farrell et al 9 realized a hot-carrier-based thermophotonic solar cell. Luo et al 10 reported a miniaturized optical airflow sensor based on a gallium nitride (GaN) chip with a flexible polydimethylsiloxane (PDMS) membrane. These studies are associated with multifunctional devices that can perform tasks such as energy storage, communication, and sensing.…”

Section: Introductionmentioning

confidence: 99%

Touchless Input/Output Interface for Device-to-Device Communication

Fu,

Wang,

et al. 2023

ACS Omega

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Multiple quantum well (MQW) III-nitride diodes show selectable functionalities of light-emitting and light-detecting behaviors, enabling direct touchless device-to-device communication. Here, we propose and demonstrate a touchless input/output (I/O) interface using a single MQW III-nitride diode. By integrating an MQW IIInitride diode with a memory via a control circuit, optical signals are converted into electrical ones to be written into a memory, and consequently, electrical information is read out from the memory to be translated into optical signals for visible light communication (VLC). The MQW III-nitride diode can not only lead to a touchless ″writing″ action but also offer a ″reading″ process through light. Such touchless I/O interface would provide new forms of interactivity for device-to-device communication technologies.

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Chip-scale optical airflow sensor

Cited by 10 publications

References 41 publications

Microfluidic flowmeter based on a liquid crystal-filled nested capillary

Microfluidic flowmeter based on a liquid crystal-filled nested capillary

A Robust Bridge‐Type Airflow Sensor Based on Flexible Superhydrophobic Carbon Nanotube Fiber Thin Films

Touchless Input/Output Interface for Device-to-Device Communication

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