在水声计量中需要有标准水听器作为标准器具传递水声声压量值。在水声测试中需要有检定过的测试水听器作为水声声压测量器具。为了满足水声计量和测试方面的需要,我院研制了SC-7401型两种尺寸的标准和测试水听器,它们适用于1赫至200千赫频段内作二级标准水听器或测试水听器用。一、水听器的结构 SC-7401型水听器结构的剖面图如图1所示。两只薄壁圆管状压电陶瓷灵敏元件用三只无硫绝缘胶垫隔振后放在黄铜材料的下支座和 A standard hydrophone is required as standard equipment to transmit the Acoustic Acoustic Pressure value in Acoustic Metering. In the acoustic test, a certified test hydrophone is required as the acoustic pressure measurement device. In order to meet the needs of underwater acoustic measurement and testing, our institute has developed SC-7401 two sizes of standard and test hydrophone which are suitable for secondary standard hydrophone or test in frequency band from 1 Hz to 200 kHz Hydrophone use. First, the structure of the hydrophone SC-7401 hydrophone structure of the cross-section shown in Figure 1. Two thin-walled tubular piezoelectric ceramic sensor with three sulfur-free insulation pads on the lower bearing brass material and