Method for reconstructing nonuniform temperature field inside structure and based on transient-state thermal boundary inversion

The invention discloses a method for reconstructing a nonuniform temperature field inside structure and based on transient-state thermal boundary inversion. The method includes that on the basis of transition time of ultrasonic pulse echo, transient-state thermal boundary conditions causing temperature change of the structure is inverted; on this basis, non-steady-state temperature distribution inside the structure is reconstructed by solving a thermal conduction equation. Compared with existing ultrasonic temperature measuring methods, the method has the advantages that ultrasonically-detected inside temperature is not acquired directly through transition time and is acquired through inverted transient-state thermal boundary conditions, so that temperature in the method is not a single average value on a transmission path any more but specific temperature distribution, and the method is higher in temperature resolution and higher in stability and can realize realtime and high-accuracy reconstruction of temperature distribution inside solid structure at different moments.