Development Of Taper Machine For Large-core Silica Rods Based On STM32

Astrophotonics is a combined subject of astronomy and photonics, which has great significance to the development of astronomy. As the receiver and transmitter of multi-targeting observation system, the performance of fiber devices is crucial to the realization of multi-targeting observation system. Compared with single mode fiber optic devices,large-core multimode fiber devices can receive more optical signals at the same time, so it is widely used in astronomical applications. At present, the fiber devices are mainly made with the fused taper method, while the traditional taper machine can only make small core fiber devices. For large-core fiber devices, the taper result is not ideal. Therefore, according to the basic theory of moving taper and the basic theory of mode coupling, the taper machine for large-core silica rods based on STM32 is developed.In this paper, the taper machine for large-core silica rods is composed of three parts,which are the heating system, the mechatronic control system and the upper computer system.In the heating system,the structure of the combustion system is designed under the premise of security, meanwhile, in order to solve the problem of uneven heating of the traditional point heating source, a novel method of plane heating source is proposed, which can control the heating process of the taper machine. In mechatronic control system, a precise mechanical structure with rotating platform is designed, which can avoid the deformation caused by gravity. In order to improve the precision of the taper machine, this paper uses STM32 series microcontroller as the main control chip of the mechatronic control system, stepper motors as the power unit, which can control the motion state of the motion system precisely. In the upper computer system, Lab VIEW as the upper computer system development software is adopted, which has good human-computer interface, in the man-machine interface, the drawing speed, the rotating speed, the flame moving speed and distance can be adjusted, so that it would better control the taper shape of the fiber devices.To test the validity of the system, first put 320?m large-core astronomical fiber into 500?m glass preform that is round on the surface and square at heart, then taper the fiber, at last the performance of tapered fiber device is tested. The results show that the taper machine can be used to carry out the taper work of large-core quartz bar, and can control the taper shape of the fiber devices well in accordance with the intended targets.