Microwave Non-Destructive Testing of Coatings and Paints Using Free Space Microwave Measurement

2005 ◽  
Vol 2 (2) ◽  
pp. 17
Author(s):  
Norhayati Hamzah ◽  
Deepak Kumar Ghodgaonkar ◽  
Kamal Faizin Che Kasim ◽  
Zaiki Awang
Keyword(s):  
Free Space ◽  
Protective Coatings ◽  
Microwave Measurement ◽  
Multiple Reflections ◽  
Destructive Testing ◽  
Lens Antennas ◽  
Coatings And Paints ◽  
Microwave Nondestructive Testing ◽  
Mode Transitions ◽  
Diffraction Effects

Microwave nondestructive testing (MNDT) techniques are applied to evaluate quality of anti-corrosive protective coatings and paints on metal surfaces. A tree-space microwave measurement (FSMM) system is used for MNDT of protective coatings. The FSMM system consists of transmit and receive spot-focusing horn lens antennas, a vector network analyzer, mode transitions and a computer. Diffraction effects at the edges of the sample are minimized by using spot-focusing horn lens antennas. Errors due to multiple reflections between antennas are corrected by using free-space LRL (line, reflect, line) calibration technique. We have measured complex reflection coefficient of polyurethane based paint which is coated on brass plates.

scholarly journals $W$ -Band Complex Permittivity Measurements at High Temperature Using Free-Space Methods

2019 ◽  
Vol 9 (6) ◽  
pp. 1011-1019 ◽  
Author(s):  
Martin S. Hilario ◽  
Brad W. Hoff ◽  
Benmaan Jawdat ◽  
Michael T. Lanagan ◽  
Zane W. Cohick ◽  
...  
Keyword(s):  
High Temperature ◽  
Complex Permittivity ◽  
Free Space ◽  
W Band ◽  
Permittivity Measurements

Grain permittivity measurements in free space

1995 ◽  
Author(s):  
A W Kraszewski ◽  
S Trabelsi ◽  
S O Nelson
Keyword(s):  
Free Space ◽  
Permittivity Measurements

Assessment of Microwave Permittivity for Detecting Fruit Maturity

1994 ◽  
Vol 347 ◽  
Author(s):  
Stuart O. Nelson ◽  
W. Roy Forbus ◽  
Kurt C. Lawrence
Keyword(s):  
Growing Season ◽  
Soluble Solids ◽  
Soluble Solids Content ◽  
Dielectric Constant And Loss ◽  
Practical Usefulness ◽  
Fruit Maturity ◽  
Three Stages ◽  
Solids Content ◽  
Permittivity Measurements ◽  
Microwave Permittivity

ABSTRACTPermittivity measurements from 0.2 to 20 GHz were taken on fresh peaches of three varieties at three stages of maturity during the growing season to determine whether dielectric properties might be correlated with maturity. Other physical properties of the peach tissue, such as density, moisture content, firmness, and total soluble solids content, were also determined. Two indices, based on dielectric constant and loss factor values at 0.2 and 10 GHz were found to correlate with stage of maturity, but they were dependent on the variety, and further study is necessary to determine their practical usefulness.

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