1/2" Infraschallmikrofon, vorpolarisiert
Infraschallmikrofon, speziell entwickelt für hochpräzise akustische Messungen mit hoher Empfindlichkeit im Frequenzbereich von 0,02 Hz bis 20 kHz.
Die Infraschall- Mikrofone Typ 4964 ist für hochpräzise akustische Messungen konzipiert, bei denen ein Infraschall- Mikrofon mit hoher Empfindlichkeit erforderlich ist. Da das Mikrofon vom Typ 4964 vorpolarisiert ist, kann es sowohl mit CCLD- als auch mit klassischen Vorverstärkern verwendet werden und eignet sich daher besonders gut für batteriebetriebene Geräte und den Einsatz in Umgebungen mit hoher Luftfeuchtigkeit.
| ½ inch Prepolarized Infrasound Microphone Type 4964 | Datenblätter | English |
| Standard | IEC 61094 |
| Sound field | Free field |
| Polarization voltage | 0V |
| Sensitivity | 50 mV/Pa |
| Lower limiting frequency | 0.02 Hz |
| Higher limiting frequency | 20 kHz |
| Inherent noise | 14.2 dB(A) |
| Upper limiting of dynamic range | 146 dB |
| Diameter | 1/2 inch |
| Venting | Rear |
| Minimum Temperature | -30 °C |
| Maximum Temperature | 150 °C |
| Minimum Temperature | -22 °F |
| Maximum Temperature | 302 °F |
At infrasound and frequencies below a few kHz, the pressure and free-field response are the same. At higher frequencies, reflections and diffractions cause pressure to increase in front of a microphone's diaphragm.
Type 4964 has been optimized for free-field, and designed for use with the protection grid in place. Type 4964 is also suited for use in class 1 sound level meters and for all high-precision acoustic measurements where a robust and stable free-field microphone with an upper frequency of 20 kHz is required.
A press-fitted, stainless-steel diaphragm ensures superior longterm stability and mechanical robustness – Type 4964 will withstand the 1 m drop test of IEC 60068–2–32.
As all Brüel & Kjær microphones, each Type 4964 is provided with an individual calibration chart including information about the open-circuit sensitivity, the frequency response in a free field as well as the electrostatic actuator response. Using the calibration data and the REq-X feature of LAN-XI, a real-time correction for different measurement situations can increase accuracy.