Microphone collects sound signal using to electret microphone. The microphone consists of dust gauze, shell, vibrating diaphragm, spacer, back plate, copper ring, cavity and PCB. The microphone is formed to a capacitor with vibrating diaphragm, spacer and back plate. There are charge on the plastic vibrating diaphragm. Once it is affected by sound, the diaphragm starts vibrating so that distance between diaphragm and back plate changes. The difference Δd is generated. According to C=εS/4πkd, the capacitance will be changed by ΔC. According to C=Q/V (Q is electric charge quantity), due to the change of ΔC, Q is constant so that voltage will change by ΔV. The sound signal is transfer to electric signal. Sensor circuit transfer the electric signal into analog signal under standard range.
Specification
| Range |
100 Hz ~ 15 kHz
|
Usage
Connect Microphone to any port in SenseDisc.
Place the SenseDisc into the environment to be measured.
Typical experiment
- Measure the frequency of sound wave
Note
Keep the frequency of sound to be measured within measuring range. If it exceeds measuring range, keep the sensor away from it or decrease sound frequency.
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The Microphone is not waterproof. If use the sensor in a wet environment, try to prevent water flowing into sensor.
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