美国喷气推进实验室利用牙科钻头上的涡轮机和混合集成电路研制出了世界上第一个用于测量直流电场的手持式探测器。该探测器直径为1英寸,长3英寸,安装在一个纤维玻璃杆上,便于用手持握。管状光学纤维通道将所测值送到数据接收器中。由于杆和纤维通道都是绝缘体,测量不会引起畸变。人可以站在几英尺之外测量,以消除人体对被测场的影响。 The US Jet Propulsion Laboratory developed the world’s first hand-held detector for measuring DC electric fields using turbines and hybrid integrated circuits on dental drill bits. The detector is 1 inch in diameter and 3 inches long and is mounted on a fiberglass rod for easy holding by hand. Tubular optical fiber channels send measured values ​​to the data receiver. Since both the rod and the fiber passageway are insulators, the measurement does not cause distortion. People can stand a few feet away from the measurement to eliminate the impact of the human body on the measured field.