Aiming at the problem of dielectric property detection of polymer materials with thickness gradual changes structure, an improved interdigital capacitive proximity sensor is designed. Finite element simulation method is proposed to investigate the effects of different number of fingers and metallization ratio on the signal strength and penetration depth, and the scope of the single pair interdigital unit width is determined. The influence of different interdigital unit width and metallization ratio for the sensor performances are carried out, the penetration depth curves are acquired. Based on the structure characteristics of the materials under test, the width of each finger which composed the interdigital sensor electrodes is optimized individually. An improved interdigital capacitive proximity sensor is designed. The results of simulation and experimental indicate that the signal strength and sensitivity are better than the traditional interdigital sensors, thus the improved interdigital sensor is more suitable for the dielectric property detection of the gradual change thickness structure.
JIAO Jingpin
,
LI Liang
,
HE Cunfu
,
WU Bin
. Design of Improved Interdigital Capacitive Proximity Sensor Used for Dielectric Property Detection of Thickness Gradual Changed Structure[J]. Journal of Mechanical Engineering, 2017
, 53(18)
: 1
-9
.
DOI: 10.3901/JME.2017.18.001
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