用于电子测量仪器设计的Wien电桥理论研究

Study on the theory of Wien-bridge used in measurement instrument design

深入分析了用于电子测量仪器设计的Wien电桥振荡器及其变型Meacham桥振荡器,给出了提高振幅与频率稳定性、减少波形失真的技术措施。讨论了电压控制式Wien电桥振荡器的构成。此外,讨论了Meacham型晶体振荡器,给出的电路可作为真空计测量低层大气的压强(760～10^(-1)Torr)。并可用于宇航测量中,以监测可能的物理效应。

An attempt has been made in this article to deeply analyze the Wien-bridge oscillator. In order to increase the amplitude and frequency stability, decrease the waveform distortion, the article gives additional information on the theory. The constitu-tion of voltage-controled Wien-bridge oscillators are discussed. Moreover, the meacham type crystal oscillator was discussed by us, which is essentially the vacuum-meter designed to measure the pressure of air of lower-atitude, i.e.760～10^(-1)Torr. It was available to mon-itor possible physical effects in the astronautic measurements.