Research On The Design And Experiment Of Piezoelectric Micro-Displacement Actuator

Nowadays, the information has become the world-wide sharing resources and influence humanity's progress, the people acquire the way of the knowledge and the experience is changing largely because of the information revolution. Along with the development of correspondence, the high communication system capacity is requiring increasingly. A stable optical pulse source with a high repetition rate is very important for realizing future ultra-high speed optical communication. The actively mode-locked erbium doped fiber laser is very attractive among those potential sources which can generate broadband tunable near transform-limited pulse with high repetition rate and has been used as the ideal optical transmitter and all optical clock source in the future long-distance communication systems. But the stability technique problem of the actively mode-locked fiber laser is not solved. So there is a distance of the practical application of actively mode-locked fiber laser. It is a problem which must be solved that how to keep the actively mode-locked fiber laser working stably for long time. So it is very valuable to study on it.In an applied electric field, it has the reverse piezoelectric effect of piezoelectric ceramic material (PZT) will be deformed. PZT is based on the application of this principle. PZT in application has many merits. It was under the control of high voltage displacement resolution (about accuracy m), and, with its high-frequency response, fast dynamic response, bearing large, stable performance and many other advantages, such as do not heat, noise and interference by foreign forces. PZT has been applied in many areas, such as the aerospace, precision engineering, auto control, biological engineering, Robot, actively mode-locked fiber laser cavity length control. Weather PZT can work normally and effectively ,It depends on the performance of the drive circuit, particularly dynamic performance. In the electrical, PZT approximate equivalent of capacitive load. It constitutes RC circuit with R, it will greatly affect the dynamic performance. Currently, the majority of PZT driver circuits are designed for PZT static application. However, ultra-high speed actively mode-locked fiber laser system, the cavity length should keep constant under the control of PZT.PZT drive circuit must have excellent dynamic characteristics.This paper's main work is based on state National Nature Science Foundation of China fund project (No.60372061)"The study on the real-self start and stability of the ultra-fast actively mode-locked fiber laser"and Science and Technology Development Planning project of Jilin Province ((2004) technology number (No.1271)) "The study on the mode control and stability of the ultra-fast actively mode-locked fiber laser ".We integrated and improved the PZT drive circuit proposed in the literature completed a good dynamic response of the PZT drive circuit. input signal 20 different signals produced by SUNING TFG2006V DDS signal generator to verification rules for non-linear amplification of the input signal. Experimental results show that 20 varieties of the input signal including the signal noise, the circuit can be driven immediately, Linear, with virtually no distortion to the input signal amplification to the PZT drive voltage. Measure the frequency response range of this circuit when sinusoidal as input signal. The results showed that the input frequency is less than 10khz, output signal distortion is less than 3.19%.When the input signal is a square wave signal and the signal output pulse rise time and fall time are only 4.6μs and 18.4μs .In addition, it was found that the input signal frequency change, the drive circuit has been a corresponding change in power consumption. After driving circuit can be drawn mapping analysis and the power consumption is a linear relationship between the input signal frequency. PZT studies in the literature have not yet seen driving circuit power consumption associated with the frequency of the input signal reports. Papers in view of the drive circuit design process for the production of PCB and electromagnetic compatibility issues were discussed. given a reasonable solution. Finally, the existing problems and the future development direction of the paper. This paper illustrates the question of EMC and PCB board during the process of driver circuit design, and provides a rational method. Finally, it also discusses the question at present and the developing direction in the future.This PZT driver has good dynamic response characteristics to the irregular signals, the frequency response range of this circuit is wide, the speed of the response is quick, the consumed power of the driver is small, so it is suit for cavity compensation system of the actively mode-locked fiber laser.