Normal incident acoustic characteristic measuring apparatus and normal incident acoustic characteristic measuring method

摘要

Provided are a normal incident acoustic characteristic measuring apparatus and a normal incident acoustic characteristic measuring method capable of effectively measuring normal incident acoustic characteristics at high temperatures. The normal incidence acoustic characteristic measuring apparatus includes a tube body in which a sound source is disposed at one end, a test body to be measured is disposed in a tube, and a sound pressure sensor is disposed between the sound source and the test body, The first tube wall portion including the first position is heated under a condition determined based on a first temperature measured at a first position between the sound source of the tube main body and the specimen. Determined based on a second temperature measured at a second position between the first heating control unit and the sound source of the tube body and the test body and closer to the sound source than the first position. And a second heating control unit that heats the second tube wall portion including the second position.