本研究旨在開發一款低電波反射之氣壓致動器,以供在電波暗室內使用。一般市面上的氣壓致動器大多使用金屬材料製作,所以不適合於電波暗室內使用,其主要原因是因為金屬材料具有高的介電係數,容易產生反射電波,進而影響電波暗室內的測試參數。研究之低電波反射氣壓致動器是使用非金屬材料所製成的,具有低介電係數之優點,當使用在電波暗室內,進行儀器測試時,具有低電波反射之特性,所以適合於電波暗室內使用。低電波反射氣壓致動器之機構設計,是採用渦輪式氣壓馬達之設計概念,於氣壓馬達性能的測試上,則是使用普羅尼( Prony )試驗機,來進行制動馬力( Brake Horse Power )之測試。由實驗結果得知,本研究所開發出之低電波反射氣壓致動器在最低起動流量17 l/min下,將可得到92 rpm之轉速及制動馬力48 mW;於最高流量26 l/min下,將可得到206 rpm之轉速及制動馬力108 mW,所以低電波反射氣壓致動器,將可以提供0.24 N-m到0.585 N-m之扭矩,而這樣的扭矩亦足以驅動測試儀器上之旋鈕。
This study aims to develop a less reflective of electromagnetic pneumatic actuator which is often used in the anechoic chamber. A pneumatic actuator on the market is used to make of metallic, it is not appropriate for use in the chamber. The reason is that those metallic have high dielectric constant which easily generates reflective electromagnetic waves to influence test parameters in the chamber. The pneumatic actuator development is made from low dielectric constant plastics with less reflective of electromagnetic. It is very suitable for use in the chamber. Use the turbine-type air motor design was appealed to develop the pneumatic actuator and employ Prony tester to execute the brake horsepower test for the test of pneumatic actuator performance. The results indicate that the pneumatic actuator in the minimal starting flow is 17 l/min, it would generate 92 rpm and brake horsepower of 48 mW; in the maximum flow is 26 l/min, it would generate 206 rpm and brake horsepower of 108 mW. Therefore, it works at the torque between 0.24 N-m and 0.585 N-m and, such torque would be sufficient to drive the target button.