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

摘要

Provided are a vertical incidence acoustic characteristic measuring device and a normal incidence acoustic characteristic measuring method capable of effectively measuring normal incidence acoustic characteristics at high temperatures. A normal incidence acoustic characteristic measuring device, a sound source is arranged at one end, a test object to be measured is arranged in a tube, a tube body in which a sound pressure sensor is arranged between the sound source and the test object, Heating a first tube wall portion including the first position under a condition determined based on a first temperature measured at a first position between the sound source and the test body of the tube main body. A first heating control unit, which is determined based on a second temperature measured at a second position closer to the sound source than the first position between the sound source of the tube main body and the test body and from the first position. A second heating control unit that heats a second tube wall portion including the second position under the above-mentioned conditions.