前言 74年夏我们和北京6971厂共同承担了六机部下达的研制小型水平探渔仪的任务,我院主要负责压电换能器的研制工作。研制水平探渔仪无论在政治、国民经济和海防上都有一定的意义。到76年春我们共研制了三台换能器并与6971厂一起做了两次海上试验。小型水平探渔仪主要装船对象为大型机帆船和小型渔轮,它们的捕鱼区在我国近海 Foreword 74 years in summer we and Beijing 6971 plant shared the responsibility of the development of a small-scale exploration sounder six machine parts, our hospital is mainly responsible for the development of piezoelectric transducers. Development level Exploration fishing instrument in terms of politics, national economy and coastal defense have a certain significance. In the spring of 1976, we developed a total of three transducers and conducted two sea trials together with the 6971 plant. Small-scale exploration rig main ship for the mainframe sailing and small fishing vessels, their fishing area in our offshore