| 摘要 |
Measurement device and method for measuring the volume acceleration of a predetermined sub-are a of an acoustically radiating surface (10), comprising a termination end and side walls (4), the side walls (4) defining a volume of air between the termination end and the acoustically radiating surface (10) in operation, and measurement means (5) for measuring the sound pressure in the volume of air. The termination end is formed by a flat piston (2) of a first material; and the measurement device (1) further comprises actuator means (6) for bringing the flat piston (2) into vibration such that the sound pressure in the volume of air is kept at a minimum level and acceleration sensing means (8) for measuring the normal acceleratin of the flat piston (2). |
