The construction of two types of probe microphones is described. Hollow, ceramic (barium titanate) cylinders, 116th inch long and 116th-inch o.d., are used for the sensitive elements. The more complex probe type A-S (Allen-Spencer) is contrasted with the simpler type H-A (Holak-Ackerman). Calibration procedures are described for each in the range 6–100 kc. The response of both types is about -140 db re 1 v/1 microbar; however the A-S type has a flatter response curve. The A-S is also less sensitive to signals striking the probe handle, but both types respond to the acoustic field at the exposed 116th-inch supporting tubing near the element. The H-A type is satisfactory for certain applications, particularly in bio-acoustics; its simplicity of construction and repair make it preferable for these applications.
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机译：描述了两种类型的探测麦克风的结构。空心的陶瓷（钛酸钡）圆柱体长116英寸，外径116英寸，用作敏感元件。比较复杂的A-S型探针（艾伦-斯潘塞）与简单的H-A型探针（Holak-Ackerman）形成对比。校准程序的描述范围为6–100 kc。两种类型的响应约为-140 db re 1 v / 1微巴；但是，A-S型的响应曲线较平坦。 A-S对敲击探头手柄的信号也不太敏感，但是两种类型都对位于元件附近的第116英寸裸露支撑管处的声场做出响应。 H-A型对于某些应用是令人满意的，特别是在生物声学中；它的构造和维修简便性使其成为这些应用的理想之选。
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