Through the principle analysis and the circuit com- parison, we have designed a better scheme of a closed electronic window trac- king system.
通过原理分析和电路比较，设计了性能较优的闭环波门跟踪系统方策应用于电视跟踪系统。
The measuring principle, optical system, circuit design, error analysis and function features of the device are introduced.
介绍了该装置的测量原理、光学系统、电路设计、精度分析和性能特点。
The design principle, circuit analysis, and transducer construction of the low frequency ultrasonic tester are described. The applications to testing concretes and rocks are discussed.
本文叙述了低频超声波检测仪的设计原理，电路分析，换能器结构并讨论了在混凝土，岩体中应用。
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