Simulation Of Temperature Field Of Photoelectric Semiconductor Detectors Irradiated By Hing Energy Laser

Photoelectric semiconductor detectors have been widely used in scientific research, manufacture and other correlative fields, and their working performance is very sensitive to the temperature change. Some photoeledtric detectors need the irradiation of high energy laser to work, and the opto-thermal effects can cause obvious temperature rise. Therefore, as an important tool to know the working performance of the photoelectric semiconductor detectors, it will have important theory value to improve the count-laser performance for the calculation of temperature fields distributing of photoelectric semiconductor detectors. Based upon the background, the simulate calculation of temperature fields of photoelectric semiconductor detectors has been accomplished in this thesis and the achievement follows as below:To begin with, the calculation model of temperature fields is generalized from one-dimensional space to two-dimensional space and the temperature fields'equation in two-dimensional space is set up. In the completed work, the calculation of temperature fields of photoeledctric semiconductor detectors has been done most in one-dimensional space under the premise that suppose the illumination of high energy laser is well-proportioned. But that isn't true about the illumination of high energy laser. So it can reflect the physics law more and its applicability will be more wide and common if we constitute the calculation of temperature fields in two-dimensional space. What's more, the calculation model of temperature fields constituted in this thesis can be generalized to all the cases in which there exists the two-dimensional axis symmetrical, and then it has the common applicability.Furthermore, to solve the variable coefficient parabolic equation in two-dimensional space, an alternating direction implicit difference form has been adopted which can be stable unconditionally and solved in chased method. Therefor, the numerical solution problem has been solved in better condition. In general, the implicit form of one- dimensional space parabolic equation is absolutely stable and the labour of calculation isn't huge. Though the implicit form is absolutely stable for high-dimensional space parabolic equation, the labour of calculation will be increased in quantity; the calculation of the explicit form is simple, but the stability condition is very harsh. So it's necessary to look for such difference method that can be both stabe and less in calculating in real application. Alternating direction implicit form is just the one that can match the demand mentioned. It's an effective fraction step-length calculation method which has high speed, small storage quantity, unconditionally stability and wide range of application.Finally, to solve the huge triangular equation group derived from the difference form, the program has been worked out and the calculation outcome has been analysed. Though there has been a fixed model to solve the triangular equation group, the labour of calculation is still huge for the one derived from high-dimensional parabolic equation and the corresponding achievement of progress is to some extent difficult. So the dividing-layer method has been adopted in this thesis. Through such program designing skill as setting array and using circulation the corresponding program has come into reality. Furthermore, we can get to the goal that different input of physics parameter, time or space step length can cause different solution; and it's convenient to analyse the physics phenomena.