Study On The FPGA Application Technology In Laser Rapid Image

In the process of preparing the nano-aluminum via Aluminum wire electrical explosion, will be accompanied by the generation of plasma, while the generation of plasma is an important factor in the results of aluminum production, therefore plasma detection is a necessary condition in improving the preparation process.Against the plasma detection in the electrical explosion, we proposed the Mach-Zehnder laser interferometry method. Dividing a bouquet of laser, which duration is nanosecond, into two equal-energy light. One of them is signal light, through the explosion area, the other one is reference light. The two light converged in the observation screen generating the interference fringes. During the explosion, the changes of the signal light phase distribution caused the changes of interference fringes and the spatial laser field variation, according to the changes of optical field, we can measure the distribution of plasma explosive areas.In this paper, we designed the synchronous control system among the explosive device, laser and CCD camera in the electrical explosion plasma detection system. During the process of electrical explosion, at the instant explosion, the duration of the plasma is short, only a few tens of microseconds. In order to capture the interference fringes clearly, at the instant explosion, we need the laser through the plasma region, and the CCD camera open the shutter in time to capture the interference image. However, the width of the laser pulse is nanosecond, and the time precision of the CCD camera shutter is millisecond, therefore, we put forward a high demand for the time accuracy of the synchronous control system.Against the project requirements, in this paper, the solution of the synchronous control system as follows: firstly, we raised a new operating mode of the CCD camera – the reverse mode, that is the camera worked in the absence of light, stopped working when there is a light, the response time for the fast light pulse is almost zero. During the work process, firstly, the CCD camera was at the open state, and the explode background light was as the system trigger signal. After the system received the trigger signal, through the delay, sent out two signals, one signal was sent to the laser to emit laser signal, the other one was sent to the CCD camera to turn off the camera. Because the control system needs the high time precision, therefore choose the FPGA as the core development tool of the synchronous control system.The main works in this paper are as follows: 1. Analyzed the basic principle involved by the synchronous control system in detail. 2. Put forward a special design for the synchronous control system. 3. Designed the hardware and software components of the synchronous control system. 4. Simulated and test the synchronous control system program.