Evaluation device and evaluation method for sound velocity characteristic of foamed cement

The invention provides an evaluation device for sound velocity characteristics of foamed cement. The evaluation device comprises a high-temperature and high-pressure kettle; a cylinder body which is arranged in the high-temperature and high-pressure kettle; a bottom cover which is hermetically connected with the cylinder body; a piston which is arranged in the cylinder body and can do telescopic motion in the axial direction, wherein the axial outer end of the piston is fixedly connected with a top cover; and a signal acquisition unit which is used for acquiring parameters of the foamed cement and comprises a temperature sensor, a pressure sensor, a sound wave emitting electrode and a sound wave receiving electrode which are respectively connected with an external computer, wherein the sound wave emitting electrode and the sound wave receiving electrode are radially and symmetrically arranged, wherein the high-temperature and high-pressure kettle can adjust and set different temperatures and pressures, and th