Method and system for analysing a test piece

A system for acoustically measuring material properties of a test piece at high temperatures, comprising:

• a heating chamber comprising a heating element for bringing the test piece within a testing temperature range;
• a sensor configured to capture a vibrational signal from the test piece during a period;
• an impact system comprising an impactor and an impactor actuator, for imparting a vibrational excitation onto a test piece located in the heating chamber;
• a control system in connection with the heating chamber, the sensor and the impactor, the control system configured to:
• instruct the heating chamber to bring the test piece within a testing temperature range;
• during a testing period, instruct the impact system to actuate the impactor with the impactor actuator such that a vibrational excitation is mechanically imparted by the impactor onto a test piece located in the heating chamber, and obtain from the sensor a vibrational response signal to said vibrational excitation,
• during a calibration period, instruct the impact system to actuate the impactor with the impactor actuator such that the impactor does not mechanically impart a vibrational excitation onto the test piece located in the heating chamber, and obtain from the sensor a noise signal, and
• obtain the material properties of the test piece by analyzing the vibrational response signal, thereby taking into account the noise signal,
• wherein the noise signal comprises noise arising from the impactor actuator and the impactor,
• wherein the impact system comprises a ballistic impactor and the impact actuator is configured to give an impulse to said ballistic impactor,
• wherein the impact actuator is configured to give a measurement impulse to the ballistic impactor for imparting a vibrational excitation onto the test piece in an acoustic measurement step, and
• wherein the impact actuator is configured to give a background impulse to the ballistic impactor for avoiding an impact onto the test piece in a background measurement step.