High-resolution polymer optical fibre humidity sensor utilizing single-passband microwave photonic filter

Cheng, Xin; Hu, Junhui; Zhu, Kun; Zhao, Zhiyong

doi:10.1016/j.measurement.2021.109462

Cited by 20 publications

(11 citation statements)

References 26 publications

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“…Xin Cheng et al [ 200 ] ( Figure 38 ) employed a single-passband microwave photonic filter in conjunction with a POF. The POF absorbs moisture from the air and swells up, changing its RI and thus optical path length.…”

Section: Literature and The State-of-the-artmentioning

confidence: 99%

Review of Optical Humidity Sensors

Rao

Zhao

et al. 2021

Sensors

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Optical humidity sensors have evolved through decades of research and development, constantly adapting to new demands and challenges. The continuous growth is supported by the emergence of a variety of optical fibers and functional materials, in addition to the adaptation of different sensing mechanisms and optical techniques. This review attempts to cover the majority of optical humidity sensors reported to date, highlight trends in design and performance, and discuss the challenges of different applications.

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Section: Literature and The State-of-the-artmentioning

confidence: 99%

Review of Optical Humidity Sensors

Rao

Zhao

et al. 2021

Sensors

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“…Since the sensors can detect the type of material by determining the dielectric constant of the material, therefore different types of substances can be measured, for example, the amount of brine [27], blood glucose [28][29][30], methanol [31,32], milk [33], moisture [34][35][36][37], oil in food [38], amount of salt and sugar in water [16], type of tissue [39], determining the amount of phosphate and nitrate [40], and most importantly determining the type of solid or liquid [11] material are among the tasks carried out by sensors. One of the most important features of sensors in today's industry is that they are non-contact [27,33] and non-invasive [2,15,24,30].…”

Section: Introductionmentioning

confidence: 99%

A symmetric bar chart-shape microwave sensor with high Q-factor for permittivity determination of fluidics

Navaei

Rezaei

Kiani

2023

Int. J. Microw. Wireless Technol.

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This paper introduces a symmetric bar chart-shape (SBCS) microwave sensor for measuring permittivity of fluidic samples. For designing purposes, the introduced sensor was used based on the field changes between the SBCS and rectangular loop microstrip (RLM) structure. When a sample is placed on the sensing location, interaction between SBCS and RLM varies the field intensity. The vinegar samples were combined with water and then they are placed on the sensor. The change in field intensity changes the resonance frequency. However, there is a relationship between the permittivity of samples and the resonance frequencies. The proposed sensor is implemented on the substrate of RO4003C. The relative permittivity of samples changed from 59 to 77 and the resonance frequencies changed from 2.3 to 1.4 GHz. The quality factor is 3544 and the sensitivity is 2.2%.

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“…Compared with electronic hygrometers, optical fiber humidity sensors have the advantages of electromagnetic interference resistance, high sensitivity, quick response and so on [1][2][3]. Several kinds of fiber RH sensors have been reported, such as those based on tapered fiber [4,5], Mach-Zehnder interferometers [6][7][8], Fabry-Perot interferometers (FPI) [9,10], optical fiber Bragg gratings [11,12], and microfiber knot resonators [13]. However, these RH sensors lack the ability to measure the temperature simultaneously.…”

Section: Introductionmentioning

confidence: 99%

A Fabry-Perot Sensor With Cascaded Polymer Films Based on Vernier Effect for Simultaneous Measurement of Relative Humidity and Temperature

Zhang¹,

Han²,

Liang³

et al. 2023

Preprint

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In this paper, fiber sensor based on Vernier effect for simultaneous measurement of relative humidity (RH) and temperature is proposed. The sensor is fabricated by coating two kinds of ultraviolet (UV) glue with different refractive indexes (RI) and thicknesses on the end face of a fiber patch cord. Vernier effect is formed by the inner lower-RI polymer cavity and the cavity composed of both polymer films. By calibrating the RH and temperature response of two peaks on the envelope of the reflection spectrum, simultaneous measurement of RH and temperature is realized by solving a set of quadratic equations. Experimental results show that the highest RH and temperature sensitivities of the sensor are 387.3 pm/%RH (in 20%RH to 90%RH) and -533.0 pm/°C (in 15°C to 40°C), respectively. The sensor has merits of low cost, simple fabrication, and high sensitivity, which makes it very attractive for applications that need to simultaneously monitor these two parameters.

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High-resolution polymer optical fibre humidity sensor utilizing single-passband microwave photonic filter

Cited by 20 publications

References 26 publications

Review of Optical Humidity Sensors

Review of Optical Humidity Sensors

A symmetric bar chart-shape microwave sensor with high Q-factor for permittivity determination of fluidics

A Fabry-Perot Sensor With Cascaded Polymer Films Based on Vernier Effect for Simultaneous Measurement of Relative Humidity and Temperature

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