Method and device for obtaining three-dimensional temperature field

The invention relates to a method and a device for obtaining a three-dimensional temperature field. A plurality of optical fiber temperature measuring devices are arranged along each axis direction; measuring the temperature of each point on any optical fiber line in real time, and importing the real-time temperature into the created Fourier heat conduction two-dimensional temperature field model; importing the two-dimensional temperature field model into a Fourier law and a first law of thermodynamics to obtain a three-dimensional temperature field model; converting into three one-dimensional temperature field models which are connected in series; and solving the temperatures in the x direction, the y direction and the z direction by using a three-diagonal matrix to obtain a solving result of the three-dimensional temperature field, and importing the result into a main control device to obtain power output of each temperature section so as to obtain a three-dimensional uniform temperature field or a three-di