- 學位論文
微型電磁脈衝電磁場感測器之研製
Study of Miniature EMP Electromagnetic Field Sensors
摘要
本論文主要目的，乃研製一種用於量測脈衝磁場的B-dot感測器，其主要特徵是利用軟性印刷電路板製作半圓柱面狀迴路曲面，此電路板利用蝕刻技術在銅片面上蝕刻兩條100歐姆之傳輸線與留下間隙，將曲面設置於介電係數高於一的介電層基板上，基板之正面有一條100歐姆之傳輸線以及接地面，基板之背面為接地面或稱之為下電極，半圓柱面狀迴路上其中一條100歐姆傳輸線經由中間板之100歐姆傳輸線連接至輸出接頭，半圓柱面狀迴路上之另一條傳輸線透過基板上之100歐姆傳輸線連接至輸出接頭，兩條100歐姆傳輸線透過阻抗匹配接至50歐姆之SMA接頭輸出。由於此感測器圓柱半徑縮小，可將感測器的量測範圍提升，與習知感測器相比，本發明之B-dot感測器體積縮小數倍以上但其靈敏度仍可符合理論值。 另外本論文也將過去所研製之電場感測器做進一步發展，增加感測器之頻寬並且利用更簡單的結構來製作感測器，達到價格便宜以及容易製作之優點。
並列摘要
A B-dot sensor is designed for measuring magnetic pulse field. The major characteristic of the sensor uses a half cylinder loop which is formed by a flexible print circuit board with two gaps and two 100 ohm transmission lines etched in the copper. The half cylinder loop sited on a substrate with dielectric constant greater than 1. The front side of the substrate has a 100 ohm transmission line and the ground plane. The back side of the substrate is ground plane. By impedance matching of transmission lines, the SMA terminal connects two transmission lines as output. Because using the flexible print circuit board formed the half cylinder loop, the radius can be reduced a lot. So the sensor’s measurement range can be raised a lot. Comparing with the other B-dot sensor that we knew, volume of the proposed sensor is reduced a lot and sensitivity still can be acceptable. This thesis also improved the performance of the D-dot sensor that we developed before. The developed sensor can measure higher frequency and use another structure that we didn’t see before to fabricate the sensor. The merit of developed sensor is cost down and easy to be fabricated.