Sensor Description:

The DT008 is a sound sensor (microphone) giving an output of ± 2.5 Volts. The DT008 is not a noise level sensor, but a sensor designed to study the properties of sound waves. The DT008 uses Fourier Systems’ Egg-Shaped sensor case. The frequency range the DT008 is responsive to is 35Hz to 5800Hz.

The microphone component inside the DT008 is composed of a changing capacitor. One of the capacitor’s plates is actually a sound-sensitive membrane, moving back and forth as sound waves resonant through it. This capacitor is connected serial to a resistor. When the capacitor is charged, and sound waves change the dialectic parameter of the capacitor, the voltage measured on the resistor changes. This voltage is then adjusted to a range of 0-5 Volts, accepted by the analog-digital converter of the Data-Logger, and transformed to a value between –2.5 to 2.5 Volts. The proper result is then recorded into the logger’s memory.

The DT008 is automatically calibrated. No further calibration is needed.

The DT008 is used for the study of sound properties. Sound speed through air and other materials, Sound Beats and harmonic properties of sound are among the experiments using the DT008. The following graph is a measurement of two interfering sound waves, creating one wave with average frequency.