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A Study of the Capacitive Sensor for Electromagnetic Absorbing Coating Thickness Measurement

Author: WangChunGuang
Tutor: GongRongZhou
School: Huazhong University of Science and Technology
Course: Microelectronics and Solid State Electronics
Keywords: Absorbing coating Capacitive sensor Thickness Gauge Nondestructive measurement Cable drive technology
CLC: TP274
Type: Master's thesis
Year: 2006
Downloads: 252
Quote: 1
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Abstract


Absorbing coating materials research , painting and construction , and quality inspection process , the thickness of the absorbing coating is a need to control and detection of important parameter . According to the structural characteristics of the absorbing materials , dielectric properties as well as absorbing coating was applied to the aluminum metal , research and compare more mature several coating non - destructive thickness measurement method based on the proposed pole-changing away from the plate capacitance sensor basic principle is applied to the non-destructive measurement of the thickness of the absorbing coating . By increased capacitive sensor detection plate around potential shielding to protect the plate , while the introduction of the drive cable technology , integrated shield technology, measuring circuit and the measuring probe and the PCB fabrication technology instead of coated probe process , design and production sensing probe part susceptible to outside interference caused by the edge of the field effect of nonlinear problems effectively overcome the capacitive sensors from the physical structure of the probe . Through the use of new capacitance signal acquisition framework type integration chip ( Frame ASIC) CAV424 and RISC Microcontroller Atmega8, differential technology and signal detection techniques combined to complete feedback op automatically compensate for the capacitance deviation , eliminates the parasitic capacitance, zero drift , the common-mode interference , and other environmental factors , to improve instrument anti-jamming capability , from the measuring circuit , to overcome the nonlinear output capacitance sensor , to achieve a thickness change amount to the linear transformation of the DC voltage , so that the system at the same time automatic zero adjustment , calibration , and reducing errors . Selected microcontroller with a built - in 10 A / D conversion the the CAV424 output differential voltage signal can be directly connected to the ADC in the microcontroller , to achieve a \. Peripheral units, circuit design , focusing on the keyboard itself and the microcontroller interface circuit and the corresponding software were careful design, draw a keyboard and microcontroller interface circuit schematics and keyboard interrupt processing flow chart . Commissioning, calibration of the system and method of detecting . The experiments demonstrated the feasibility of the design theory and practicality of the thickness gauge .

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