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(一) 前言 70年初,我们接受了某项科研任务,任务对我们提出的要求是提供深海用接收换能器。为测定其性能,需进行高静水压下低频灵敏度的测量。为了满足这一要求,即开始进行高静水压下标准水听器低频灵敏度的校准工作。采用的方案是,将小型标准水听器放在小型、刚性壁耦合腔内进行互易法绝对校准,然后做比较校准。最初我们制作的标准水听器形式是:把PZT-5(直径φ=30mm,厚t=4mm)园片直接用环氧树脂灌铸封装在大螺丝端面上,但这种大螺丝换能器的缺点是(1)整个结构体积大、重量重,而压电元件却占很小部分,从振动结构上看,单片一面接收声波作用灵敏度很低。
(I) Preface In the early 1970s, we accepted a certain scientific research mission. The task we asked for it was to provide deep-sea receiving transducers. In order to measure its performance, low-frequency sensitivity measurement under high hydrostatic pressure is required. To meet this requirement, calibration of low-frequency sensitivity of a standard hydrophone under high hydrostatic pressure has begun. The solution used is to calibrate the small standard hydrophone in small, rigid walled coupling cavities for absolute reciprocity and then for comparative calibration. Initially we produced a standard hydrophone version: PZT-5 (diameter φ = 30mm, thickness t = 4mm) wafer directly epoxy encapsulation on the large screw end face, but this large screw transducer The shortcomings are: (1) The whole structure is bulky and heavy, while the piezoelectric element occupies a small part. From the vibration structure point of view, the sensitivity of the monolithic receiving acoustic wave is very low.