Planar microwave cavity drop-in type liquid dielectric value detection sensor
A microwave cavity and dielectric technology, which is applied in the direction of material analysis, instruments, and measurement devices using microwave means to achieve the effect of simple processing circuits
Active Publication Date: 2021-12-03
DALIAN UNIV OF TECH
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Problems solved by technology
However, this requires a certain volume of liquid to analyze the dielectric properties
Especially in the detection of biological and chemical solvents, the limited volume of liquid samples is a practical problem that limits the analysis of liquid materials
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[0028] The inner dimension of the FR4 container that the present invention adopts is 7.5 * 7.5mm 2 , to cover the sensor detection area. The height of the container is 1.6 mm, which provides enough space for adjusting the volume of the liquid to be measured. The width and length of the container (ie c1 and c2) are respectively larger than the width of the detection area sensor (4.1×4.6mm 2 ) 3.4 and 2.9mm larger to ensure that the liquid to be tested is exposed to the electric field on the side of the container.
[0029] A parametric study of the influence of the volume of the liquid to be measured on the reflected notch frequency and decibels is carried out. different volumes of liquid to be tested for the evaluation of the sensor, Figure 5 Displays the measurement results. S11 was evaluated for different volumes of 0.02, 0.04, 0.06, 0.08 and 0.1 mL of deionized (DI) water placed on the detection area. Deionized water was chosen because it has a high dielectric constant...
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Abstract
The invention belongs to the technical field of microwave sensing, and relates to a drop-in liquid dielectric value detection sensor of a planar microwave cavity. The square OCSRR of the detection sensor is fixed on the top surface of the single-sided FR4 substrate, and there is a rectangular detection area on the top of the square OCSRR. The rectangular detection area has a rectangular structure, and the two output terminals of the square OCSRR are connected to the two input terminals in the rectangular detection area. The outside of the rectangular structure is a three-sided metal rectangular frame, the two ends of the metal rectangular frame are suspended, the two metal wires in the rectangular detection area are located inside the metal frame, and one end of the two metal wires is suspended. The metal wires are arranged in a rectangular loop inside the metal frame. The two metal wires are parallel to each other, and the direction of the inner metal wire is opposite to that of the outer metal wire. The present invention adopts a drop-in method, which is directly dropped and placed on the top of the sensing area to be tested, without additionally making high-precision micro-channels. The sensing end is suitable for mass production, and the back-end processing circuit is simple.
Description
technical field [0001] The invention belongs to the technical field of microwave sensing, and relates to a drop-in liquid dielectric value detection sensor of a planar microwave cavity. Background technique [0002] Microwave sensing is a reliable method for liquid characterization that has been applied over the past decade. Split-ring resonators (SRRs), complementary SRRs (CSRRs), open CSRRs (OCSRRs) and other cavity resonator particles, isolated or coupled to transmission lines, have become the focus of considerable attention for sensing applications. The electromagnetic properties of these particles depend on the resonant frequency shift and quality factor change of the liquid variables. By measuring the reflection coefficient and transmission coefficient, the complex dielectric parameters of the liquid sample can be obtained. This provides a new sensing platform for the bio, pharmaceutical and fuel industries. Most microwave sensors are placed in supercylindrical duct...
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IPC IPC(8): G01N22/00
CPCG01N22/00
Inventor 李杰森王志强李国锋
Owner DALIAN UNIV OF TECH