Low-cost plastic optical fiber sensor embedded in mattress for sleep performance monitoring

Han, Pengfei; Li, Linqing; Zhang, Hao; Guan, Longzhou; Marques, Carlos; Savović, Svetislav; Ortega, B.; Min, Rui; Li, Xiaoli

doi:10.1016/j.yofte.2021.102541

Cited by 57 publications

(27 citation statements)

References 33 publications

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“…Recently, a system similar to that of [19], i.e. POF matrix with cuts embedded in a mattress, was used for sleep monitoring [20]. The system has been shown to be able to distinguish four sleep-related behavioral states, as well as to obtain breathing and heart rate data in different sleep positions and postures.…”

Section: Introductionmentioning

confidence: 99%

Instrumented Office Chair With Low-Cost Plastic Optical Fiber Sensors for Posture Control and Work Conditions Optimization

et al. 2022

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People spend more and more time sitting and this habit has been shown to cause spine pathologies. Thus, the scientific community and the industry have become interested in instrumented chairs development to detect incorrect user postures. In this work we present the development and implementation of invisibles and non-intrusive plastic optical fiber sensor cells to monitor the posture and evaluate the ergonomic behavior of a seated person. The low-cost plastic optical fiber (POF) based sensing devices developed in this work, were implemented in an office chair, to evaluate the workers posture throughout their work day. In addition to the sensors, Android and PC software applications were developed, to provide real time feedback and alerts to the user whenever an inadequate posture is detected, or the seating position is the same for a long time. The proposed approach was evaluated in a study involving six users, and results show that it can detect the user's position with 96.6% accuracy.

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Section: Introductionmentioning

confidence: 99%

Instrumented Office Chair With Low-Cost Plastic Optical Fiber Sensors for Posture Control and Work Conditions Optimization

et al. 2022

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“…With growing interest towards the continuous monitoring of cardiovascular conditions in inpatient and remote care settings, new sensors utilising novel techniques to measure various cardiovascular parameters have been developed. These include optical fiber-based sensors such as those reported in [5,6], which have the advantages of being unaffected by electromagnetic interference, being lightweight and chemically stable, among others [6,7]. Recently, Diffuse Speckle Pulsatile Flowmetry (DSPF) has been developed as a noninvasive, portable, and cost-effective optical fiber-based technique for blood flow measurement in deep tissue (up to approximately 15 mm) [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Experimental characterization of diffuse speckle pulsatile flowmetry system

Choo

Zhang

et al. 2022

Front. Phys.

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The recently developed Diffuse Speckle Pulsatile Flowmetry (DSPF) technique offers high measurement rates of around 300 Hz for non-invasive blood flow measurement of blood flow in deep tissue (up to a depth of approximately 15 mm), showing promising potential for the monitoring of various pathologies associated with abnormal blood flow. The effects of various parameters associated with this technique such as speckle size and exposure time on the measured flow readings, however, have yet to be studied. In this work, we examine these relationships experimentally, observing that the number of pixels per speckle (a measure of speckle size) and exposure time have a strong inverse relationship and a positive relationship respectively with the measured DSPF readings in no-flow setups using both static single light scattering and multiple light scattering mediums. We also studied how the sensitivity of DSPF readings to flow is affected by these parameters, finding that the number of pixels per speckle and exposure time have an inverse relationship and strong positive linear relationship respectively with the gradient of the regression line between the actual and measured flow rates in a dynamic setup using a tissue-mimicking flow phantom. It is hoped that these results would enable researchers using the DSPF technique to select and utilize the most optimized settings for their specific use applications.

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“…Thanks to the fast development in the past few years, the suitability of POF-based point sensors has been demonstrated for a broad range of applications. For example, POFs have been applied to monitor sleep performance, structural health and environmental conditions, respectively [21][22][23]. However, the application of POF-based distributed sensors is rare.…”

Section: Introductionmentioning

confidence: 99%

Distributed Humidity Sensing in Concrete Based on Polymer Optical Fiber

Hicke

Breithaupt

et al. 2021

Polymers

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We present a preliminary investigation on distributed humidity monitoring during the drying process of concrete based on an embedded polymer optical fiber (POF). The water dissipated into the POF changes several properties of the fiber such as refractive index, scattering coefficient and attenuation factor, which eventually alters the Rayleigh backscattered light. The optical time domain reflectometer (OTDR) technique is performed to acquire the backscattered signal at the wavelengths 650 nm and 500 nm, respectively. Experimental results show that the received signal increases at 650 nm while the fiber attenuation factor clearly increases at 500 nm, as the concrete dries out. In the hygroscopic range, the information retrieved from the signal change at 650 nm agrees well with the measurement result of the electrical humidity sensors also embedded in the concrete sample.

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Low-cost plastic optical fiber sensor embedded in mattress for sleep performance monitoring

Cited by 57 publications

References 33 publications

Instrumented Office Chair With Low-Cost Plastic Optical Fiber Sensors for Posture Control and Work Conditions Optimization

Instrumented Office Chair With Low-Cost Plastic Optical Fiber Sensors for Posture Control and Work Conditions Optimization

Experimental characterization of diffuse speckle pulsatile flowmetry system

Distributed Humidity Sensing in Concrete Based on Polymer Optical Fiber

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