电子清管器发射机系统的改进设计

现有的以555芯片产生间断超低频（23Hz左右）电磁脉冲的电子清管器发射机系统会带来频率漂移、各组振荡问的相位关系随机不恒定及静态功耗偏大的问题。为此利用89c2051编程产生间断的超低频脉冲信号，解决了频率漂移及振荡间的相位关系随机的问题。通过采取配置合适的晶振和电源电压措施，并在软件设计部分充分利用单片机休眠模式的低功耗特性，解决了功耗问题。经测试频率稳定在（233-0．01）Hz，振荡间的相位关系恒定。有效工作时间由60h提高至100h。

Improvement to the transmitter system of electronic pipeline pig

The existing transmitter system of electronic pipeline pig based on 555 chip to produce intermittent ultra-low frequency electromagnetic pulse （about 23 Hz） brought about many problems such as the frequency drift, not constant phase-relationship between groups of oscillations and too large static power. Therefore the signal of intermittent ultra-low frequency pulses was produced by 89c2051 programming. Problems of the frequency drift and not constant phase-relationship between groups of oscillations were solved. Through the appropriate allocation of the crystal and power supply and making full use of the mcu＇s sleep mode of low-power consumption in the software design, the power problem was solved. The testing frequency stability was （23 ± 0.01）Hz. The phase-relationship between groups of oscillations was constant and effective working hours was risen from 60 hours to 100 hours.