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

The G.R.A.S. 46DE is a 1/8'' CCP Pressure Microphone Set. The preamplifier is 1/8", making it the world's smallest microphone set.

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Frequency Range : 6.5Hz to 140kHz 

Dynamic Range    : 47 dB(A) to 175dB

Sensitivity            : 0.62 V/Pa

More details

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. 

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Typical application and use 

As the 46DE is smaller than any other measurement microphone, it can be used in any application where size constraintspreviouslymadeitimpossibletomeasure,beitseparatemicrophonesmountedinveryconfinedspaces 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'slowsensitivityandsmallsizemakesitidealformeasurementsofhighlevelsandhigh-frequencies,and for measurements of im pulsive noise. 

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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.

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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. 

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Theverysmallsizemakesitpossibletomeasureinsideevenverysmallscalemodels-itcanbefittedinsidesmall scalemodelswithminimaldisturbancetothesoundfield.Also,itcanmeasurethehigherfrequenciesusedinscale model testing.

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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.

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

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Design

The G.R.A.S. 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 G.R.A.S. 40DD 1/8" Prepolarized Pressure Microphone,designed for long-term reliability in multiple environments.

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Preamplifier

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

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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 beenpossible 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. 

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