话筒

话筒适用于广泛的测量应用。四种类型的麦克风定义了声场和对特定环境、行业和测量条件的适应性，分别称为自由场、压力场、漫射场和特殊麦克风。HBK 话筒提供直径为 1 英寸、1/2 英寸、1/4 英寸或 1/8 英寸的尺寸，并且需要麦克风前置放大器。

自由声场麦克风

自由声场麦克风设计为在自由声场中具有平坦的频率响应。自由场麦克风通常用于消声室或远离反射建筑物等的声音测量。自由场麦克风的另一个应用领域是一般Electroacoustic用途，如扬声器和麦克风测量。

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压力场麦克风

压力场是指在该场内任何位置具有相同幅度和相位的声压。与压力场非常相似的声场可以在小空腔(与波长相比较小)如人工耳朵中实现。

压力场麦克风通常用于耦合器、风洞或齐平安装测量。

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扩散声场麦克风

消声室的对面是混响室，所有表面都尽可能的坚硬和反射，并且不存在平行表面。
因为所有的声波都是从各个方向以相等的概率和水平同时到达的，所以这会造成漫射场。
在具有硬墙的建筑等环境中，可以实现与漫射场非常相似的声场，在这些环境中同时存在许多声源或噪声源，例如舱内测量和教堂中。
如果您不确定您所处的声场，最好假设它是扩散的，以将测量误差降至最低。扩散场麦克风通常用于 测量车辆内部噪声或建筑声学。

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Types 4160 and 4180 are both high stability condenser microphones for laboratory standard applications and in coupler measurements.

USE SCENARIOS

Laboratory standard microphones
Pressure and Free Field Reciprocity Calibrations
Coupler measurements

FEATURES

Well defined integral front cavities for coupler calibrations
Low hydrogen leakage from front cavity
Well-defined operating characteristics
Flat Frequency Pressure Responses up to: 4160: 8 kHz/4180: 20 kHz
Artificially aged for long term stability
Low sensitivity to environmental changes

Type 4160 has been used for some time in such applications and conforms to IEC 327 and 402, ANSI S1.12-1967 and ANSI Sl.lO-1966, JIS C 5515, and the current IEC draft standard for 1” laboratory standard microphones. It has become established as a high precision reference standard and is used in the medium frequency ranges and for measurements at low sound pressure levels.

Type 4180 has been developed to meet a growing need for a laboratory standard ½" microphone which enables measurements at higher frequencies and at higher sound pressure levels. It has been designed to comply with the most recent drafts of laboratory standard microphone standards. Types 4160 and 4180 are delivered with individual calibration charts.

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话筒

自由声场麦克风

压力场麦克风

扩散声场麦克风

USE SCENARIOS

FEATURES

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Calibration Services for Transducers

Services

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