Heating of an absorbing medium by parametrically conjugated ultrasound beam

Experimental results on heating of an absorbing medium by parametrically conjugated ultrasound beam are reported. A polymer with acoustic parameters close to those of biological tissues was used for heating. Advantages of the developed method due to phase conjugation phenomenon are demonstrated by means of thermocouple measurements: automated targeting of an ultrasonic beam on the area of heating, and weak impact of the sample’s position or its movement in some limits on the warming process. The value of heating achieved 8С within about 100 s.