Non-contact Void Detection in Concrete Layers using Reflection and Transmission Coefficients Using a Microstrip Patch Antenna
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Abstract
This article is to present non-contact void detection in concrete layers based on the reflected power electromagnetic waves response to different permittivities of concrete with and without voids. The measurement is accomplished by employing a vector network analyzer connected with a microstrip patch antenna. The antenna was developed on a double-sided FR-4 PCB. The antenna was designed to operate at 1.614 GHz with a return loss less than -25 dB. The reflection coefficient S11 was measured in the concrete by the transmitting antenna, while the receiving antenna on the opposite side of concrete blocks measured the transmission coefficient S21. The concrete block was measured along its length and the measurement positions were adjusted using a driven rail system. The results for the concrete sample with voids and without voids showed that the average S11 was -30.93 dB and -22.88 dB respectively while the average S21 was -16.48 and -18.86 dB, respectively. The reference values of S11 and S21 of concrete voids are respectively lower than -28.11 dB and higher than -17.53 dB. The accuracy of void detection in concrete is at 94%, that can be concluded that electromagnetic waves can be effectively applied to detect concrete voids.
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พรพิมล ฉายแสง, อลงกต ไชยอุปละ, สินาด โกศลานันท์ และ ประพัน ลี้กุล.(2566). ระบบตรวจสอบคุณภาพการบ่มคอนกรีตในช่วงอายุต้นแบบไม่ทำลายด้วยอัตราส่วนของกำลังงานการสะท้อนในย่านความถี่ไมโครเวฟ. วารสารวิทยาศาสตร์และเทคโนโลยี, 31(5), 108-122.
ภราดร กัณหากรณ์, เวธนี ฤกษสโมสร, วิศรุตา ฤกษสโมสร, นรสิงห์ อินมณเทียร, ทนงศักดิ์ อิ่มใจ, มนเทียร เสร็จกิจ, สุพชัย ทิพย์ภักดี และ ชิระวัฒน์ วัฒนพานิช. (2566). การทำนายพฤติกรรมของโครงสร้างคอนกรีตผสมเศษคอนกรีตเก่ารับแรงเฉือนด้วยโปรแกรมประมวลผลภาพถ่าย WU-DIC. วารสารวิชาการพระจอมเกล้าพระนครเหนือ, 33(2), 355-368.
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