A Non-contact Microwave Sensor System for Characterizing a Binary-liquid Mixed Concentration

Seewattanapon, Somporn; Namsang, Apirada; Lerdwanittip, Reungyot; Akkaraekthalin, Prayoot; Rakluea, Chawalit; Duangrit, Nattapong

doi:10.1109/ieecon56657.2023.10126757

Cited by 1 publication

(1 citation statement)

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“…In addition, capacitorbased sensors may undergo chemical reactions depending on the type of fluid being measured [8] and have a low sensitivity with regard to liquid measurements with high dielectric losses such as saline water [9]. Level sensors based on a microwave resonator [10] have been proposed as an alternative to guided radar, but metal pipes cannot be used [9]. Contact-type liquid-level sensors have been developed to detect pressure varying with liquid height using the elastic modulus of optical fibers floating on the surface of the liquid.…”

Section: Introductionmentioning

confidence: 99%

Microstrip-Line Sensor for the Estimation of the Fluid Level Inside a Closed Metal Pipe

Lee,

Cho,

Kim

2024

IEEE Access

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A transmission-line type fluid-level sensor with a low-cost connected oscillator and detector is proposed. The designed sensor is a physical sensor applicating microwave technology and is a simple fluidlevel sensor that relies on radio frequency (RF) signal-attenuation changes based on the fluid's height. The proposed sensor can provide real-time measurements of fluid height inside an opaque metal pipe by inserting a microstrip line into the pipe, with a simple oscillator and detector module connected at each end. The fluid level inside the metal pipe can be accurately determined with a portable multimeter, eliminating the need for the complex calibration process typically associated with conventional RF-based measurement instruments. The transmission line for the proposed sensor is designed to operate within a dynamic range of -15 dB in a 50-mm diameter metal pipe used for fluid transportation. This system accommodates microstrip line with superstrate and a superstrate-to-substrate thickness ratio of 0.236 to satisfy dynamic range and the linear insertion loss trend. A prototype sensor tested with purified water achieves a dynamic range of 13.1 dB and shows linearity between insertion loss and fluid height at 3.9 GHz.

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