Ultrasound Microphones for the
Avisoft-Bioacoustics UltraSoundGate Devices
The modular device concept of the UltraSoundGate system makes it possible to use various exchangeable ultrasonic microphones. Choose the model that is most appropriate for your specific application.
| Microphone principle | pre-polarized
condenser (electret) |
externally polarized condenser (200V) | |
|---|---|---|---|
| Microphone model |
Knowles FG Knowles FG-O |
UltraSoundGate CM16/CMPA |
UltraSoundGate CM24/CMPA |
| Relative flatness of the frequency response | poor | good | |
| Frequency range [kHz] | 10-120 | 2-250 | |
| Relative sensitivity at 50 kHz | medium | high | |
| Approximate self-noise level, bandwidth: 30- 50 kHz [dBSPL] | 26 | 18 | 15 |
| Directionality | low | medium | high |
| Reliability in high-humidity environments | very good | good | |
| Total size [mm] | 19 x 19 x 47 | 36 x 36 x
60 (including CMPA) |
44 x 44 x
54 (including CMPA) |
| Weight [g] | 40 | 65 (including CMPA) |
65 (including CMPA) |
| Power requirements | 5V, 6 mA | 5V, 14 mA | |
| Compatibile to | UltraSoundGate xx16x | ||
| Part # | 40001, 40007 | 40011 | 40041 |
Relative signal-to-noise ratios of different microphones (sound source located exactly on-axis). Note that the s/n ratio will be degraded if the sound source is located off-axis. The off-axis attenuation will depend on the physical size of the diaphragm and the signal frequency. So, the largest model Avisoft CM24/CMPA is the most directional one.
See Ultrasound Microphones P48 for details on the phantom-powered microphone models that can be used with common field recorders or computer audio interfaces.
See the CM16/CMPA microphone page for details on the avilable options for connecting the condenser microphone to other recording hardware (including National Instruments devices).
In order to attach other sensors, such as hydrophones, piezo elements or third-party measurement microphones, there are additional adapter boxes available:
The microphone mixer allows to attach up to 4 microphones to a single UltraSoundGate microphone input.