26. The world's smallest microphone Set - 46DE

46DE is a low-sensitivity pressure microphone set for sound measurements at high levels and high frequencies. It consists of a 40DD 1/8" pressure microphone and a 26CE 1/8" preamplifier. Normally a 1/8" microphone is used with a 1/4" preamplifier, but for 46DE G.R.A.S. has developed a 1/8" preamplifier, making the 46DE microphone set the world's smallest. 

46DE是一款低灵敏度压力麦克风，适用于高频和高频声音测量。 它由40DD 1/8寸压力麦克风和26CE 1/8寸前置放大器组成。 通常1/8寸麦克风与1/4寸前置放大器一起使用，但为了46DE GRAS 开发了1/8寸前置放大器，使46DE麦克风成为世界上最小的。

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Typical application and use 

典型应用和使用

As the 46DE is smaller than any other measurement microphone, it can be used in any application where size constraints previously made it impossible to measure, be it separate microphones mounted in very confinedspaces or a number of 46DEs mounted closely together for improved resolution. This fact opens the door to more application than we can suggest here. 46DE's low sensitivity and small size makes it ideal for measurements of high levels and high-frequencies,and for measurements of im pulsive noise. 

由于46DE比任何其他测量麦克风都小，因此它可以用于以前无法测量尺寸限制的任何应用中，无论是安装在非常狭窄的空间中的单独麦克风，还是紧密安装在一起的多个46DE，以提高分辨率。 这打开了更多应用的大门。 46DE的低灵敏度和小尺寸使其成为高电平和高频测量以及脉冲噪声测量的理想选择。

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The low sensitivity and very small form factor makes the 46DE extremely versatile with respect to signal levels, frequency range and applications.

低灵敏度和非常小的外形使46DE在信号电平，频率范围和应用方面极为通用。

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It can be used for measurements of turbulence and flow in wind tunnels and for engine testing. It is also ideal for measurements of impulsive noise from for example inflating airbags and noise from guns and explosives. 

它可用于测量风洞中的湍流和流量及用于发动机测试。 46DE也是测量冲击噪音的理想选择，例如充气安全气囊和枪支和爆炸物的噪音。

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The very small size makes it possible to measure inside even very small scale models-it can be fitted inside small scale models with minimal disturb ance to the sound field. Also, it can measure the higher frequencies used in scale model testing.

46DE 非常小的尺寸使得即使是非常小的模型内部也可以进行测量 - 它可以安装在小型模型内，对声场的干扰最小。 此外，它还可以测量比例模型测试中使用的较高频率。

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The 46DE is a pressure microphone set and as such optimized for acoustic measurements of sound pressure at a boundary or wall; in which case the microphone forms part of the wall and measures the sound pressure on the wall itself. However, if used as you would a free-field microphone, it can be used up to at least 20 kHz before you need to apply free field corrections.

46DE是一个压力麦克风，因此优化了边界或墙壁声压的声学测量; 在这种情况下，麦克风形成墙壁的一部分并测量墙壁本身的声压。 但是，如果像使用自由场麦克风一样使用它，在需要应用自由场校正之前，46DE可以使用至少20 kHz。

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46DE is also ideal where a large number of microphones on a small area is desired. 

46DE也是需要在小面积上使用大量麦克风的理想选择。

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Design

The GRAS 46DE is a high-performance standard microphone set. In our clean-room environment the set is assembled and sealed with a label. Microphone Themicrophonecartridgeisthehigh-quality GRAS 40DD 1/8" Prepolarized Pressure Microphone,designed for long-term reliability in multiple environments.

GRAS 46DE是一款高性能标准麦克风套装。它在我们的洁净室环境中，装置组装并用标签密封。 麦克风麦克风推车脊是高品质的GRAS 40DD 1/8寸预极化压力麦克风，专为在多种环境中长期可靠性而设计。

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Preamplifier 前置放大器 

The preamplifier is the G.R.A.S. 26CE 1/8" Preamplifier. 

前置放大器是GRAS 26CE 1/8寸前置放大器。

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The extremely small preamplifier is divided in to three parts, 1)aninputsection, (3mmindiameter) that is attached to microphone, 2) a length of cable and 3) the output section located at the other end of the cable in the same housing as the connector . In this way it has been possible to make the part of the preamplifier close to microphone very small, while the more space - demand in gelectronics in the output stageis located at the other end of the cable where it does not disturb the sound field or poses space-based restrictions on the mounting options. The three parts constituting the preamplifier are factory assembled as a complete unit that cannot be disassembled. The cable between the input and output section is 1 meter, longer cable lengths are not available as they would influence the performance negatively. 

极小的前置放大器分为三个部分，1）输入部分，（3mm直径）连接到麦克风。 2）一段电缆和 3）输出部分位于电缆的另一端与连接器。 通过这种方式，可以使前置放大器的部分接近麦克风非常小，而输出级中的电子学需求越多，位于电缆的另一端，它基于安装选项的限制不会干扰声场或构成空间。 构成前置放大器的三个部件在工厂组装成一个不能拆卸的完整单元。 输入和输出部分之间的电缆为1米，较长的线缆长度不可用，因为它们会对性能产生负面影响。

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