Electroacoustical components

Sensors

Accelerometers


The BU Series piezo-ceramic accelerometer has output from 20 Hz to above 10 kHz, and is used primarily as a contact microphone for high noise environments. It may also be used as an accelerometer with lightweight structures.
As a contact microphone, the BU may be worn on the throat, or touching a bony part of the head (top, temple, or mastoid bone). BU has been integrated into helmet designs for radio communication for military and emergency services.

Features

• Voice intelligibility in a noisy environment
• Convenience of wearing (when integrated onto another worn article such as a helmet)
• Unobtrusive compared to a close talking boom microphone
• Waterproof and heat resistant

Product Families Model ID Dimensions 1 kHz Sensitivity Port Location Response Directional Peak Frequency Noise Max (Input Ref.) Noise Max (Output Noise) Downloads
BU BU-21771-000 7.92mm x 5.59mm x 4.14mm (.312in x .220in x .163in) -45 n/a n/a -103 dB
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BU BU-23173-000 7.92mm x 5.59mm x 4.14mm (.312in x .220in x .163in) -39 n/a n/a -103 dB
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BU BU-23842-000 7.92mm x 5.59mm x 2.28mm (.312in x .220in x .090in) -40 n/a n/a -103 dB
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(160.23 kB)
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BU BU-27135-000 7.92mm x 5.59mm x 2.28mm (.312in x .220in x .090in) -45 n/a n/a -103 dB
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Ultrasonic


While Knowles industry-leading MEMs silicon surface mount microphone technology, in bottom port configuration offer flat frequency response in the standard audio bandwidth, they are also capable to support even higher frequency bands. Sensor designs are possible across a wide spectrum of applications requiring highly miniaturized solutions for sensing and actuation/signaling.

Features

• High frequency functionality
• Wide range of applications
• Micro-sized sensing and actuation

Product Families Model ID Dimensions 1 kHz Sensitivity Port Location Response Directional Peak Frequency Noise Max (Input Ref.) Noise Max (Output Noise) Downloads
SP SPU0410LR5H 3.76mm x 3.00mm x 1.10mm -38.0 Bottom na Omni-directional na na na
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