BRUEL & KJAER 4188 - Page 117

Chapter 5 — Free-field
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" Microphone Type 4191
Frequency Response
Falcon™ Range of Microphone Products
Microphone Handbook
Brüel & Kjær
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5.3.7 Pressure-field Response
The microphone’s pressure-field correction curve is shown in Fig.5.12. This correc-
tion is added to the microphone’s actuator response obtained using Electrostatic
Actuator UA0033 in order to determine the pressure-field response. The typical
pressure-field response is shown in Fig.5.13.
In practice, the pressure-field response is often regarded as being equal to the
actuator response as the difference between them is small compared to the uncer-
tainty related to many types of measurement.
Fig.5.11 Typical random-incidence response for the microphone without protection grid
Fig.5.12 Pressure-field correction for the microphone
940941/1e
– 5
5
0
– 10
– 15
– 20
1 k 10 k 100 k100
dB
Frequency (Hz)
Response (dB)
940867e
2
4
3
1
0
– 1
1 k 10 k 100 k100
Frequency (Hz)
Correction (dB)