Saturation of peripheral oxygen （SpO2） is one of the most important parameters of vital signs. Pulse oximeter based on near-infrared spectroscopy is commonly used as a non-invasive method to measure SpO2 yl. Current...Saturation of peripheral oxygen （SpO2） is one of the most important parameters of vital signs. Pulse oximeter based on near-infrared spectroscopy is commonly used as a non-invasive method to measure SpO2 yl. Currently, medical device manufacturers as well as metrology measurement agencies in China usually use pulse oximeter simulator as the commonly accepted functional calibration equipment for pulse oximeters. So far, no experimental protocol or devices can be used to test the accuracy and reliability of a pulse oximeter simulator. Therefore, a set of new metrology apparatus with the name of calibration device for pulse oximeter simulator have been designed in order to make a traceable system for the calibration or verification of pulse oximeter simulators. The principles and some research methods of this calibration device for pulse oximeter simulator will be discussed in this paper. Besides that, many experiments have been applied in order to guarantee the accuracy as well as traceability of this set of device.展开更多
Photoelectric pulse oximeters are widely favored for their non-invasive and continuous monitoring of pulse rate and blood oxygen saturation,which are vital indicators of physiological health.However,traditional pulse ...Photoelectric pulse oximeters are widely favored for their non-invasive and continuous monitoring of pulse rate and blood oxygen saturation,which are vital indicators of physiological health.However,traditional pulse oximeters are frequently hindered by several limitations,such as high-power consumption,instability,and reduced precision.Herein,a WSe_(2)/Si p-n heterojunction photodiode was in-situ fabricated for self-powered high-precision pulse rate and blood oxygen saturation monitoring.Our device demonstrated the excellent broadband photoresponse performance from 265 to 980 nm,covering the biological window,including a high responsivity of 740 mA/W,a fast response time of 7.8/7.1μs and a low detection limit of 25 nW/cm^(2).Leveraging these prominent photoelectrical properties,the WSe_(2)/Si photodiode demonstrates high accuracy and reliability in detecting the physiological signals of heart rate and blood oxygen saturation through a triple-wavelength measurement method,with an error margin of less than 1%,thereby validating its accuracy and reliability for non-invasive health monitoring applications.These achievements provide a new approach for developing low-power,high-sensitivity optoelectronic pulse oximeters.展开更多
Antimony selenide(Sb_(2)Se_(3))has recently made considerable photovoltaic,advancements in photoelectrochemical,and photodetector research scenarios,owing to its advantageous material merits and superior optoelectroni...Antimony selenide(Sb_(2)Se_(3))has recently made considerable photovoltaic,advancements in photoelectrochemical,and photodetector research scenarios,owing to its advantageous material merits and superior optoelectronic properties.By contrast,the exploration of flexible Sb_(2)Se_(3) photoelectric devices are less attempted,though it possesses unique one-dimensional(1D)crystal structure to enable large deformation tolerance.Here,we develop a flexible Sb2Ses thin-film photodetector on polyimide substrate.Thanks to the high-quality SbSes light absorber and benign interfaces at both back contact and heterojunction regions,the carrier dynamics are effectively optimized.The leading flexible Sb_(2)Se_(3) photodetector showcases self-powered and broadband features,with exceptional responsivity of 0.51 A·W^(-1) and realistic detectivity up to 1.32×10^(13) Jones,ultra-fast response speed of 49 ns/351 ns of rise and decay times,and remarkable mechanical deformation stability,flourishing the high-level development for flexible Sb_(2)Se_(3) photodetectors.Interestingly,a tunable single/dual-color flexible imaging system under band alignment modulation,along with a wearable and accurate heart rate/arterial blood oxygen saturation photoplethysmography detection system highlights the great application potential for flexible Sb,Ses photodetectors.展开更多
文摘Saturation of peripheral oxygen （SpO2） is one of the most important parameters of vital signs. Pulse oximeter based on near-infrared spectroscopy is commonly used as a non-invasive method to measure SpO2 yl. Currently, medical device manufacturers as well as metrology measurement agencies in China usually use pulse oximeter simulator as the commonly accepted functional calibration equipment for pulse oximeters. So far, no experimental protocol or devices can be used to test the accuracy and reliability of a pulse oximeter simulator. Therefore, a set of new metrology apparatus with the name of calibration device for pulse oximeter simulator have been designed in order to make a traceable system for the calibration or verification of pulse oximeter simulators. The principles and some research methods of this calibration device for pulse oximeter simulator will be discussed in this paper. Besides that, many experiments have been applied in order to guarantee the accuracy as well as traceability of this set of device.
基金financially supported by the National Natural Science Foundation of China(Nos.U22A20138 and 62374149)the Natural Science Foundation of Henan Province(No.252300421059)Henan Province Undergraduate Colleges and Universities Young Key Teachers Development Program(No.2023GGJS007).
文摘Photoelectric pulse oximeters are widely favored for their non-invasive and continuous monitoring of pulse rate and blood oxygen saturation,which are vital indicators of physiological health.However,traditional pulse oximeters are frequently hindered by several limitations,such as high-power consumption,instability,and reduced precision.Herein,a WSe_(2)/Si p-n heterojunction photodiode was in-situ fabricated for self-powered high-precision pulse rate and blood oxygen saturation monitoring.Our device demonstrated the excellent broadband photoresponse performance from 265 to 980 nm,covering the biological window,including a high responsivity of 740 mA/W,a fast response time of 7.8/7.1μs and a low detection limit of 25 nW/cm^(2).Leveraging these prominent photoelectrical properties,the WSe_(2)/Si photodiode demonstrates high accuracy and reliability in detecting the physiological signals of heart rate and blood oxygen saturation through a triple-wavelength measurement method,with an error margin of less than 1%,thereby validating its accuracy and reliability for non-invasive health monitoring applications.These achievements provide a new approach for developing low-power,high-sensitivity optoelectronic pulse oximeters.
基金This work was supported by the National Natural Science Foundation of China(Nos.62104156,62074102,22275180,and 2019YFA0405600)Guangdong Basic and Applied Basic Research Foundation(Nos.2023A1515011256 and 2022A1515010979)ChinaShenzhen Science and Technology Program(No.GJHZ20240218113809019).
文摘Antimony selenide(Sb_(2)Se_(3))has recently made considerable photovoltaic,advancements in photoelectrochemical,and photodetector research scenarios,owing to its advantageous material merits and superior optoelectronic properties.By contrast,the exploration of flexible Sb_(2)Se_(3) photoelectric devices are less attempted,though it possesses unique one-dimensional(1D)crystal structure to enable large deformation tolerance.Here,we develop a flexible Sb2Ses thin-film photodetector on polyimide substrate.Thanks to the high-quality SbSes light absorber and benign interfaces at both back contact and heterojunction regions,the carrier dynamics are effectively optimized.The leading flexible Sb_(2)Se_(3) photodetector showcases self-powered and broadband features,with exceptional responsivity of 0.51 A·W^(-1) and realistic detectivity up to 1.32×10^(13) Jones,ultra-fast response speed of 49 ns/351 ns of rise and decay times,and remarkable mechanical deformation stability,flourishing the high-level development for flexible Sb_(2)Se_(3) photodetectors.Interestingly,a tunable single/dual-color flexible imaging system under band alignment modulation,along with a wearable and accurate heart rate/arterial blood oxygen saturation photoplethysmography detection system highlights the great application potential for flexible Sb,Ses photodetectors.
