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为了测量低能级(超压小于2公斤/厘米~2)冲击波超压——时间曲线,我们研制了一种有较高灵敏度的,微秒量级上升时间,毫秒量级持续时间的压电冲击波换能器。这种换能器在弹性杆式换能器的基础上作了某些改进:采用匹配散射块来代替弹性杆,同时在压电片——匹配散射块组件和外壳之间采用了一种新型软性环氧树脂作为固支材料,这样既缩短了弹性杆的有效长度,又进一步改善了换能器的瞬态特性.文中介绍了这种换能器的结构、设计、校正方法和阻抗匹配电路。
To measure the overpressure-time curve of the shock wave at a low energy level (overpressure of less than 2 kg / cm2), we developed a piezoelectric shock wave with a higher sensitivity in the microsecond rise time, millisecond duration Transducer. This transducer made some improvements on the flexible rod transducer: using a matching scattering block instead of a spring rod, and using a novel type between the piezoelectric film-matching scattering block assembly and the housing Soft epoxy resin as the support material, which not only shortens the effective length of the elastic rod, but also further improve the transient characteristics of the transducer.The article describes the structure of the transducer, design, calibration methods and impedance matching Circuit.