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A wide-band precision acoustic measuring head

机译：宽带精密声学测量头

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摘要

An acoustical measuring head (AMH) is presented which combines two known operation principles, the "transfer function method" (TFM) and the "calibrated source method" (CSM). The AMH is able to measure sound pressure, volume velocity, and thereby an acoustic impedance. The main advantage of the AMH is that it covers an arbitrarily wide frequency range within the limits of fundamental mode propagation. Due to the application of the CSM no lower frequency limit exists, in principle. The TFM allows to measure up to the cut-off frequency of the lowest higher order mode. The design of a particular AMH with a tube diameter of 8 mm covering the audio frequency range up to 16 kHz is presented. It is shown that a very high accuracy can be obtained, although the AMH is constructed in a fairly simple way. It consists of a short brass measuring tube, a tweeter, two electret microphones and some damping material. For calibration a plug, which can be inserted into the tube, and a tube extension are needed.
机译：提出了一种声学测量头（AMH），它结合了两种已知的操作原理，即“传递函数法”（TFM）和“校准源法”（CSM）。 AMH能够测量声压，体积速度，从而测量声阻抗。 AMH的主要优点是它覆盖了基本模式传播范围内的任意宽频率范围。由于CSM的应用，原则上不存在下限频率。 TFM允许测量最高最低阶次模式的截止频率。提出了一种特定AMH的设计，其管径为8 mm，覆盖了高达16 kHz的音频范围。结果表明，尽管以相当简单的方式构造了AMH，但仍可以获得很高的精度。它由一个短的黄铜测量管，一个高音扬声器，两个驻极体麦克风和一些阻尼材料组成。为了进行校准，需要一个可插入管中的塞子和一个管延长件。

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