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

摘要

A normal incident acoustic characteristic measuring apparatus and a normal incident acoustic characteristic measuring method capable of effectively measuring normal incident acoustic characteristics at a high temperature are provided. In a normal incidence acoustic characteristic measuring apparatus, 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. A first tube wall including the first position under a condition determined based on a first temperature measured at a first position between the tube body and the sound source of the tube body and the specimen. A second temperature measured at a second position closer to the sound source than the first position and between the sound source of the tube body and the test body, And a second heating control unit that heats the second tube wall portion including the second position under the condition determined based on the above. [Selection] Figure 1