Capacitive microphone sensors enable convenient and accurate measurement of microphone performance calibration, applicable in production line testing of capacitive microphones and laboratory calibration scenarios. The frequency response curve of the microphone can be measured using the electrostatic exciter method or the coupled cavity comparison method.
Characteristics of Capacitive Microphone Measurement:
1. Capable of automatically correcting system errors.
2. Rapid sweep frequency response measurement
3. Measurement of the open-circuit sensitivity of a transducer using the insertion voltage method.
4. Automatic production line qualification judgment
5. Automatic report generation with database storage for easy search, comparison, and matching.
The principle of capacitive microphone measurement:
When sound waves act upon a metal diaphragm, the diaphragm vibrates accordingly, altering its distance from the fixed electrode plate, thereby changing the capacitance. This change in capacitance can be converted into a variation of the electrical signal in the circuit. Thus, through this physical process, the vibration of sound waves can be transformed into corresponding electrical signals in the circuit, which are then output through the load resistor.
If the sound is loud, the membrane's vibration amplitude is large, resulting in a higher output voltage amplitude; if the pitch of the sound is high, the membrane's vibration frequency is high, leading to a higher frequency of voltage change; if the timbre of the sound differs, the membrane's vibration pattern (waveform) is different, and accordingly, the output voltage exhibits corresponding waveform changes. Thus, the three elements of sound are converted into the three elements of electrical signals (amplitude, frequency, waveform).
In summary, the capacitive microphone is currently a microphone with relatively high performance across various metrics. It boasts excellent frequency characteristics, crisp sound quality, robust construction, and compact size. It is widely used in radio and television stations, film studios, and hall amplification systems, among other venues.
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