利用Ag、Cu和Ni扩散入CdS,并在空气中退火的方法,制成了频率为10～300兆赫的纵波和横波超声换能器,并研究了其频率特性和动态范围。在相对通带为70～170%时,获得了换能损耗为15～25分贝。高阻扩散层压电半导体换能器是宽频带的,在几兆赫到几百兆赫的频率范围内,可以有效地应用。这类换能器简单,且制造方便, Using the diffusion of Ag, Cu and Ni into CdS and annealing in the air, the longitudinal and transverse ultrasonic transducers with frequency of 10 ~ 300 MHz were fabricated, and their frequency characteristics and dynamic range were studied. In the relative passband of 70 ~ 170%, the conversion loss was 15 to 25 dB. High-resistance diffusion-laminated piezoelectric semiconductor transducers are broadband and can be effectively used in the frequency range from a few megahertz to a few hundred megahertz. Such transducers are simple and easy to manufacture,