Chapter 2 — Prepolarized Free-field
1
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2
" Microphone Type 4188
Frequency Response
Falcon™ Range of Microphone Products
Microphone Handbook
BE1374– 12
2
−
7
UA0033. This is a reproducible and practical method for calibrating a microphone’s
frequency response.
The microphone is polarized by a fixed charge-carrying layer deposited on the back-
plate. This layer is negatively charged which, at low frequencies, results in a posi-
tively increasing output voltage for a positively increasing incident sound pressure.
2.3.4 Low-frequency Response
The low-frequency response (see Fig.2.3) is the typical response with the vent ex-
posed to the sound field. If the vent is not exposed to the sound field, the sensitivity
Fig.2.4 Typical actuator response measured with Electrostatic Actuator UA0033
Fig.2.5 Typical actuator phase response measured with Electrostatic Actuator UA0033
940666e
– 5
5
0
– 10
– 15
– 20
1 k 10 k 100 k100
Frequency (Hz)
Response (dB)
940667e
– 90
0
– 45
– 135
– 180
1 k 10 k 100 k100
Frequency (Hz)
Response (Degrees)
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