Wearable breath monitoring based on a flexible fiber-optic humidity sensor

Bao, Weijia; Chen, Fengyi; Lai, Huailei; Liu, Shen; Wang, Yiping

doi:10.1016/j.snb.2021.130794

Cited by 49 publications

(20 citation statements)

References 39 publications

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“…Unlike their electronic counterparts, these sensors are unaffected by electromagnetic interference because the sensing components do not include electronic circuits [ 75 , 76 ]. Thus, they can be used as breathing monitors [ 77 , 78 ], ventilators, and other respiratory aids [ 79 , 80 , 81 , 82 ] for human patients in environments producing strong electromagnetic fields such as inside an MRI chamber. In addition, they are compact and lightweight, making them portable.…”

Section: Types Of Fast-response Humidity Sensormentioning

confidence: 99%

“…The dotted line represents the condition of equal response ( τ res ) and recovery time ( τ rec ). The reported values are dispersed from 100 to 0.01 s. Ultrafast response and recovery times shorter than 0.1 s are achieved by resistive-type [ 54 , 64 , 67 ], capacitive-type [ 129 , 130 ], and optical-type humidity sensors [ 82 , 110 , 111 ]. Frequency- and voltage-type sensors have relatively longer response and recovery times.…”

Section: Response and Recovery Of Reported Fast-response Humidity Sen...mentioning

confidence: 99%

See 1 more Smart Citation

Respiratory Monitoring by Ultrafast Humidity Sensors with Nanomaterials: A Review

Kano

Jarulertwathana

Mohd-Noor

et al. 2022

Sensors

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Respiratory monitoring is a fundamental method to understand the physiological and psychological relationships between respiration and the human body. In this review, we overview recent developments on ultrafast humidity sensors with functional nanomaterials for monitoring human respiration. Key advances in design and materials have resulted in humidity sensors with response and recovery times reaching 8 ms. In addition, these sensors are particularly beneficial for respiratory monitoring by being portable and noninvasive. We systematically classify the reported sensors according to four types of output signals: impedance, light, frequency, and voltage. Design strategies for preparing ultrafast humidity sensors using nanomaterials are discussed with regard to physical parameters such as the nanomaterial film thickness, porosity, and hydrophilicity. We also summarize other applications that require ultrafast humidity sensors for physiological studies. This review provides key guidelines and directions for preparing and applying such sensors in practical applications.

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Section: Types Of Fast-response Humidity Sensormentioning

confidence: 99%

Section: Response and Recovery Of Reported Fast-response Humidity Sen...mentioning

confidence: 99%

Respiratory Monitoring by Ultrafast Humidity Sensors with Nanomaterials: A Review

Kano

Jarulertwathana

Mohd-Noor

et al. 2022

Sensors

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show abstract

“…In recent years, the humidity method is particularly prominent in non-contact respiratory detection because of its advantages of high accuracy, convenience, and strong reliability . The principle of the humidity method is that monitoring the human respiration states by sensing the humidity changes in the inhaled and exhaled gas. , Therefore, the accuracy and stability of the used humidity sensor are highly required. Various types of humidity sensors have been developed, including humidity sensors based on resistance, capacitance, surface acoustic wave (SAW), quartz crystal microbalance (QCM), colorimetry, and optical fiber .…”

Section: Introductionmentioning

confidence: 99%

Guar Gum/Ethyl Cellulose-Polyvinyl Pyrrolidone Composite-Based Quartz Crystal Microbalance Humidity Sensor for Human Respiration Monitoring

Yan

Zhang

Liu

et al. 2022

ACS Appl. Mater. Interfaces

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In this work, the guar gum (GG) and the electrospinned ethyl cellulose-polyvinyl pyrrolidone (EC-PVP) nanofibers were used as humidity-sensitive materials for fabricating a quartz crystal microbalance (QCM) sensor. Fourier transform infrared spectroscopy, scanning electron microscopy, water contact angle test, and X-ray photoelectron spectra were used to characterize the synthesized GG/EC-PVP composite material, confirming its successful preparation and good hydrophilicity. The humidity sensitivity experiments were performed at room temperature. The GG/EC-PVP-coated QCM sensor has high sensitivity (55.72 Hz/%RH) and low hysteresis (2.8% RH) in a wide relative humidity range (0–97% RH), short response/recovery time (26/2 s), excellent selectivity, good repeatability, and stability. The combined action of hydrophilic groups and porous structure enhances the humidity sensitivity. The GG/EC-PVP sensor can be used to capture and measure typical breathing patterns in different human basic emotions due to its good performance. Furthermore, a lie-detector system was also designed for judging the lying through detecting the emotional breathing pattern of the subjects.

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“…Wearable devices based on flexible electronics have experienced tremendous growth and development over the past two decades [ 1 , 2 , 3 ]. Among them, the data glove is one of the most popular wearable devices.…”

Section: Introductionmentioning

confidence: 99%

Low-Cost Self-Calibration Data Glove Based on Space-Division Multiplexed Flexible Optical Fiber Sensor

Zheng

Liu

et al. 2022

Polymers

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Wearable devices such as data gloves have experienced tremendous growth over the past two decades. It is vital to develop flexible sensors with fast response, high sensitivity and high stability for intelligent data gloves. Therefore, a tractable low-cost flexible data glove with self-calibration function based on a space-division multiplexed flexible optical fiber sensor is proposed. A simple, stable and economical method was used to fabricate flexible silicone rubber fiber for a stretchable double-layered coaxial cylinder. The test results show that the fiber is not sensitive to the temperature range of (20~50 °C) and exhibits excellent flexibility and high stability under tensile, bending and torsional deformation. In addition, the signal detection part of the data glove enables compact and efficient real-time information acquisition and processing. Combined with a self-calibration function that can improve the accuracy of data acquisition, the data glove can be self-adaptive according to different hand sizes and bending habits. In a gesture capture test, it can accurately recognize and capture each gesture, and guide the manipulator to make the same action. The low-cost, fast-responding and structurally robust data glove has potential applications in areas such as sign language recognition, telemedicine and human–robot interaction.

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Wearable breath monitoring based on a flexible fiber-optic humidity sensor

Cited by 49 publications

References 39 publications

Respiratory Monitoring by Ultrafast Humidity Sensors with Nanomaterials: A Review

Respiratory Monitoring by Ultrafast Humidity Sensors with Nanomaterials: A Review

Guar Gum/Ethyl Cellulose-Polyvinyl Pyrrolidone Composite-Based Quartz Crystal Microbalance Humidity Sensor for Human Respiration Monitoring

Low-Cost Self-Calibration Data Glove Based on Space-Division Multiplexed Flexible Optical Fiber Sensor

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