Study of Humidity Sensor Based on Mach-Zehnder Interference

Xuemin, 唐学敏 Tang; Jiali, 安佳丽 An; Yongxing, 金永兴 Jin

doi:10.3788/lop51.060603

Cited by 4 publications

(3 citation statements)

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“…This significant change in RI leads to variations in the wavelength of the resonant peak as the RI fluctuates with RH, thus sensitively reflecting changes in the humidity of the material under test. The quasi-linear relationship between the RI of PVA and humidity can be approximately expressed by equation (2) [28]:…”

Section: Basic Theory and Structurementioning

confidence: 99%

Simultaneous measurement of temperature and humidity using a dual-parameter sensor based on SPR and no-core fiber technology

Song,

Jing,

Yin

2024

Phys. Scr.

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In this article, we present a surface plasmon resonance (SPR) sensor based on a no-core fiber (NCF) structure for simultaneous measurement of temperature and humidity. The sensor is simulated by depositing a silver film on the exterior of the NCF by magnetron sputtering, followed by the application of a composite thin film of polyvinyl alcohol (PVA) and polydimethylsiloxane (PDMS). This configuration induces SPR resonance phenomena at two distinct wavelengths, resulting in the splitting of the resonance peak into two distinct peaks, enabling simultaneous measurement of temperature and humidity. To achieve optimal sensor performance, the thickness of the PDMS-PVA composite film, the proportion of sensitive materials, the thickness of the silver film, and the structural parameters of the fiber were optimized. Simulation results show that the sensor exhibits a humidity sensitivity of 8.60 nm/%RH over a relative humidity (RH) range of 50%-100%. The highest temperature detection sensitivity achieved is 7.40 nm/°C. This sensor holds great potential for applications in monitoring changes in environmental temperature and humidity.

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Section: Basic Theory and Structurementioning

confidence: 99%

Simultaneous measurement of temperature and humidity using a dual-parameter sensor based on SPR and no-core fiber technology

Song,

Jing,

Yin

2024

Phys. Scr.

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“…Additionally, it is cost-effective and easy to prepare, providing a convenient integration solution for the sensor [20]. As ambient humidity increases, the refractive index of PVA decreases linearly [21]. Conversely, when humidity in the outside air increases, the PVA lm absorbs water, resulting in a decrease in its RI that shifts the resonant peak of the interference spectrum towards the short wavelength direction.…”

Section: Structure and Theoretical Backgroundmentioning

confidence: 99%

Dual-core photonic crystal fiber temperature and humidity sensor based on PDMS and PVA

Song,

Jing,

yin

et al. 2024

Preprint

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Temperature and humidity sensors are applied in environmental monitoring, agriculture, food industry, and biochemical detection. To enhance their sensitivity and efficiency, this work presents a temperature and humidity sensor that uses surface plasmon resonance (SPR) and photonic crystal fiber (PCF). The sensor comprises a hexagonal pattern of holes and two planes. On one side of the plane, a gold film coated with polydimethylsiloxane (PDMS) is used for temperature measurement, while on the other side, a gold film with polyvinyl alcohol (PVA) is used for humidity measurement. The finite element method is used to analyze the sensor's sensing characteristics, revealing that its temperature sensitivity ranges from 20℃ to 90℃ at 3.82 nm/℃, while its humidity sensitivity ranges from 20–98% at 5.013 nm/%RH. Overall, this sensor can operate effectively in both temperature and humidity environments, simultaneously measuring both parameters.

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“…Zhu et al (17) studied a preparation method for aqueous solutions of PVA, conducted refractive index sensing experiments, and proposed a tapered optical fiber humidity sensor based on a PVA-aluminum film. Tang et al (18) fabricated a novel Mach-Zehnder (MZ) interference optical fiber humidity sensor by splicing a 15 mm single-mode optical fiber between two standard single-mode fibers. The single-mode part in the middle was coated with a layer of 5% PVA, and the sensitivity of the humidity sensor was measured to be 0.0983 nm/% RH.…”

Section: Introductionmentioning

confidence: 99%

Optical Fiber Fabry–Perot Humidity Sensor Filled with Polyvinyl Alcohol

Wang¹,

Zhang²,

Yu³

et al. 2021

Sensors and Materials

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An optical fiber Fabry-Perot (F-P) humidity sensor was fabricated using polyvinyl alcohol (PVA) and a single-mode optical fiber. Humidity response experiments were carried out in the humidity range of 22-98% RH with a cycle of rising and falling humidity to investigate the repeatability of its response to humidity. The sensitivity was 36.71 pm/% relative humidity (RH) with linearity of 0.99773 under rising humidity and 37.63 pm/% RH with linearity of 0.99846 under falling humidity. The experimental results showed that the humidity sensor has good repeatability and consistency. Typical tests under 75% RH were performed to obtain the dynamic response characteristics. The dynamic response wavelength drift was measured repeatedly, which showed a high response speed. The response time and recovery time were 1.5 and 2.5 s, respectively. Furthermore, the dependence of the response characteristics on the cavity length and PVA concentration was investigated. The experimental results showed that the sensor maintains a highly linear response to humidity over a wide range of RH regardless of the cavity length and PVA concentration. The research results indicate the possibility of realizing an easily fabricated, low-cost, and high-performance optical fiber humidity sensor.

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Study of Humidity Sensor Based on Mach-Zehnder Interference

Cited by 4 publications

References 0 publications

Simultaneous measurement of temperature and humidity using a dual-parameter sensor based on SPR and no-core fiber technology

Simultaneous measurement of temperature and humidity using a dual-parameter sensor based on SPR and no-core fiber technology

Dual-core photonic crystal fiber temperature and humidity sensor based on PDMS and PVA

Optical Fiber Fabry–Perot Humidity Sensor Filled with Polyvinyl Alcohol

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