In order to expand the limits of current excitation devices, LMS developed a new highly compact sound source-receiver. This acoustic exciter can be used as a very compact low-level volume displacement source. But the same acoustic exciter can also be used as a low-frequency microphone. The sound source is especially suitable for lower frequency reciprocal acoustic transfer function measurements in special situations. With only 74mm length, this extremely compact sound source-receiver can be used where minimal space is available, minimal diffraction disturbance is required, and where a lower excitation level is sufficient.
As a microphone, the device is mostly suited for locations with high levels of low frequency noise and/or high airflow conditions.
Typical applications are airborne source quantification (ASQ) of intake and the exhaust systems of vehicles and vibro-acoustic modal analysis.
This small acoustic exciter can be driven by a LMS Qsources Measurement Amplifier or similar when it is used as a source. The microphone does not need any power supply and can be directly connected to any high input impedance signal acquisition instrument such as the LMS SCADAS III frontend.
Features:
- Covers frequency range from 100-1000Hz.
- Highly compact design with very low diffraction of the sound field.
- Suitable for use in small cavities.
Benefits:
- Fast and accurate quantification of nozzle noise in vehicles.
- Real-time volume displacement output signal.
- Reduced measurement time due to reciprocal FRF measurement.
