Signal Detection And Man-machine Interface Design For Radio Frequency-excited Slab Co₂ Laser

RF excited CO₂ laser is used in field of industrial laser processing extensively. Unless precise detecting and controlling of its parameters have been carried out, RF excited CO₂ laser can't operate stably for a long time. The thesis aims to design the signal detection system of the measurement and Man-machine Interface for the laser.The thesis aims to develop signal detection and Man-machine Interface for the RF-excited CO₂ Laser. The selection of critical technology and components, detection and control of signals, measurement and control of pressure, detection and control of water flow, temperature, laser light power, and technology of human machine interface have been researched. The main achievements of the research are shown as follow:(1) The structure and operation principle of the laser have been analyzed. And the laser measurement system has been designed on this basis, which includes four parts: the measurement of water flow; the measurement of pressure; the measurement of temperature; the measurement of laser light power. Considering the characteristic of the Laser specific sensors have been chosen. According to different components and signals, the signal collecting circuit has been designed.(2) The detection and control system of laser power signal has been designed. The principles, structure and the main parameters of RF power supply have been analyzed. According to the principles of RF power supply, detection programs of the main parameters which includes the RF input power, RF reflection power and the high-voltage of the plate of electronic tube have been designed.(3) The human machine interface has been designed. According to the request of the control system of RF-excited CO₂ Laser, the Weinview MT506 touch-screen has been chosen. The alarm, display, protection and communication capabilities of the control system are completed Within 10 menus.