Control device progress of crystallization of a bath of molten material in a process of directional solidification using ultrasound

摘要

Device for controlling the progress of the crystallization of a bath of molten material held in unacámara thermally insulating a crystallization furnace according to a procedure solidificacióndirigida, comprising an ultrasound source (5) and an ultrasound detector (6 ), wherein: - the ultrasound source (5) comprises n unit (s) greater than or equal to 1 integer where n, each set comprising source transducer (7), which is capable of emitting a ultrasonic wave, connected to a waveguide (8) which is capable of guiding the ultrasonic wave produced by said transducer, haciala interface vapor-liquid (3) from the liquid bath, - the ultrasound detector (6) comprises at least 2n sets, each set comprising of a guidance wave detector (10) connected to a transducer (9) which is capable of detecting an ultrasonic wave being dichaguía wave (10) capable of guiding a wave ultrasonic to to said transducer; and characterized in that: the n sets of the source and at least 2n sets of detector is placed above the interface vapor-liquid (3) of the liquid bath in different positions, so that the ultrasonic wave generated by a transducer dela source impinges on the interface vapor-liquid at an acute angle to the normal to said interface Yque this ultrasonic wave reflected by the interface vapor-liquid according to the same acute angle, is detected Porun transducer detector, the transducers of the source and detector are located outside the chamber and waveguides lafuente and detector through the wall of said chamber, and the waveguides comprise an input face of an ultrasonic wave, an output face of a ondaultrasónica and a side surface connecting these two sides, the faces situated between the ingress policer faces and faces of output waveguides pointing being the i nterior chamber coated porous unacapa (11) which ensures an impedance match between the waveguide and the atmosphere Lacámara, said porous layer having a less than 1000 kg / m3 density.