Improving the Sensitivity of Humidity Sensor Based on Mach-Zehnder Interferometer Coated with a Methylcellulose

Huang, Jun; Wang, Bowen; Ni, Kai

doi:10.1155/2018/5680128

Cited by 7 publications

(3 citation statements)

References 15 publications

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“…Compared to a traditional electric RH sensor, optical fiber-based sensors exhibit a great number of advantages, such as security to the human body, miniaturization for integration, and good resistance to electromagnetic interference. In recent years, a variety of fiber devices have been implemented in to the design of optical fiber RH sensors, configurations including interferometers [ 1 , 2 , 3 , 4 , 5 , 6 , 7 ], long period fiber gratings [ 8 , 9 ], tapered fibers [ 10 , 11 , 12 , 13 ], fiber Bragg gratings (FBGs) [ 14 , 15 , 16 , 17 , 18 ], mode couplers [ 19 , 20 ], ZnO nanostructures [ 21 , 22 ], evanescent wave absorption structures [ 23 , 24 ], and so on. Among these configurations, light intensity demodulation is often used since it is simple and cost effective.…”

Section: Introductionmentioning

confidence: 99%

Mechanism and Characteristics of Humidity Sensing with Polyvinyl Alcohol-Coated Fiber Surface Plasmon Resonance Sensor

Shao

Wang

Cao

et al. 2018

Sensors

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A surface plasmon resonance (SPR) sensor based on a side-polished single mode fiber coated with polyvinyl alcohol (PVA) is demonstrated for relative humidity (RH) sensing. The SPR sensor exhibits a resonant dip in the transmission spectrum in ambient air after PVA film coating, and the resonant wavelength shifts to longer wavelengths as the thickness of the PVA film increases. When RH changes, the resonant dip of the sensor with different film-thicknesses exhibits interesting characteristics for optical spectrum evolution. For sensors with initial wavelengths between 550 nm and 750 nm, the resonant dip shifts to longer wavelengths with increasing RH. The averaged sensitivity increases firstly and then drops, and shows a maximal sensitivity of 1.01 nm/RH%. Once the initial wavelength of the SPR sensor exceeds 850 nm, an inflection point of the resonant wavelength shift can be observed with RH increasing, and the resonant dip shifts to shorter wavelengths for RH values exceeding this point, and sensitivity as high as −4.97 nm/RH% can be obtained in the experiment. The sensor is expected to have potential applications in highly sensitive and cost effective humidity sensing.

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Section: Introductionmentioning

confidence: 99%

Mechanism and Characteristics of Humidity Sensing with Polyvinyl Alcohol-Coated Fiber Surface Plasmon Resonance Sensor

Shao

Wang

Cao

et al. 2018

Sensors

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“…A sensitivity of 0.094% RH was obtained during the simulation. An increase or decrease in the relative humidity has shown the difference of intensities up to 0.03 dB ( 10 ). Highly sensitive silicon MZI based ultrasound sensor was discussed by Ouyang et al In this sensor, one end of the sensing arm was integrated with a thin membrane and another end of the arm was used as a reference.…”

Section: Type Of Optical Mems Sensors With Applicationmentioning

confidence: 99%

A Comprehensive Review on the Optical Micro-Electromechanical Sensors for the Biomedical Application

Upadhyaya

Hasan

Abdel‐Khalek

et al. 2021

Front. Public Health

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This study presented an overview of current developments in optical micro-electromechanical systems in biomedical applications. Optical micro-electromechanical system (MEMS) is a particular class of MEMS technology. It combines micro-optics, mechanical elements, and electronics, called the micro-opto electromechanical system (MOEMS). Optical MEMS comprises sensing and influencing optical signals on micron-level by incorporating mechanical, electrical, and optical systems. Optical MEMS devices are widely used in inertial navigation, accelerometers, gyroscope application, and many industrial and biomedical applications. Due to its miniaturised size, insensitivity to electromagnetic interference, affordability, and lightweight characteristic, it can be easily integrated into the human body with a suitable design. This study presented a comprehensive review of 140 research articles published on photonic MEMS in biomedical applications that used the qualitative method to find the recent advancement, challenges, and issues. The paper also identified the critical success factors applied to design the optimum photonic MEMS devices in biomedical applications. With the systematic literature review approach, the results showed that the key design factors could significantly impact design, application, and future scope of work. The literature of this paper suggested that due to the flexibility, accuracy, design factors efficiency of the Fibre Bragg Grating (FBG) sensors, the demand has been increasing for various photonic devices. Except for FBG sensing devices, other sensing systems such as optical ring resonator, Mach-Zehnder interferometer (MZI), and photonic crystals are used, which still show experimental stages in the application of biosensing. Due to the requirement of sophisticated fabrication facilities and integrated systems, it is a tough choice to consider the other photonic system. Miniaturisation of complete FBG device for biomedical applications is the future scope of work. Even though there is a lot of experimental work considered with an FBG sensing system, commercialisation of the final FBG device for a specific application has not been seen noticeable progress in the past.

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“…Optical fiber sensors provide several advantages over conventional electrical sensors, such as integrated miniaturization and good resistance to electromagnetic interference [ 2 ]. Various optical fiber structures have been used recently in the design of RH sensors, including interferometers [ 3 , 4 , 5 , 6 , 7 , 8 ], long-period fiber gratings [ 9 , 10 ], fiber Bragg gratings [ 11 , 12 , 13 , 14 ], microfibers [ 15 , 16 , 17 , 18 , 19 ], and polymer fibers [ 20 , 21 , 22 , 23 ]. These structures can be broadly divided into two types: intensity modulated and wavelength modulated.…”

Section: Introductionmentioning

confidence: 99%

Highly Sensitive Surface Plasmon Resonance Humidity Sensor Based on a Polyvinyl-Alcohol-Coated Polymer Optical Fiber

Wang

Shao

et al. 2021

Biosensors

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A surface-plasmon-resonance-based fiber device is proposed for highly sensitive relative humidity (RH) sensing and human breath monitoring. The device is fabricated by using a polyvinyl alcohol (PVA) film and gold coating on the flat surface of a side-polished polymer optical fiber. The thickness and refractive index of the PVA coating are sensitive to environmental humidity, and thus the resonant wavelength of the proposed device exhibits a redshift as the RH increases. Experimental results demonstrate an average sensitivity of 4.98 nm/RH% across an ambient RH ranging from 40% to 90%. In particular, the sensor exhibits a linear response between 75% and 90% RH, with a sensitivity of 10.15 nm/RH%. The device is suitable for human breath tests and shows an average wavelength shift of up to 228.20 nm, which is 10 times larger than that of a silica-fiber-based humidity sensor. The corresponding response and recovery times are determined to be 0.44 s and 0.86 s, respectively. The proposed sensor has significant potential for a variety of practical applications, such as intensive care and human health analysis.

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Improving the Sensitivity of Humidity Sensor Based on Mach-Zehnder Interferometer Coated with a Methylcellulose

Cited by 7 publications

References 15 publications

Mechanism and Characteristics of Humidity Sensing with Polyvinyl Alcohol-Coated Fiber Surface Plasmon Resonance Sensor

Mechanism and Characteristics of Humidity Sensing with Polyvinyl Alcohol-Coated Fiber Surface Plasmon Resonance Sensor

A Comprehensive Review on the Optical Micro-Electromechanical Sensors for the Biomedical Application

Highly Sensitive Surface Plasmon Resonance Humidity Sensor Based on a Polyvinyl-Alcohol-Coated Polymer Optical Fiber

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