Application Cases

Experiment Name: Acoustic Wave Sensing Experiment

Experiment Content:
Measure the voltage signals output by acoustic sensors and calculate their characteristics such as sensitivity and frequency response.

Research Direction: Acoustic Sensing Technology

Test Equipment:
ATA-309 power amplifier, signal generator, acoustic sensor, photodetector, speaker, laser, computer, etc.

Figure 1: Schematic Diagram of the Experimental Setup

Experimental Procedure:
The experiment simulates an acoustic field in air to test the performance of acoustic sensors. The signal generator is connected to the power amplifier, which is then linked to the speaker. The signal generator outputs a single-frequency sinusoidal signal, and the power amplifier controls the amplitude of the sinusoidal voltage. The speaker converts the electrical signal into an acoustic wave signal, which is received by the acoustic sensor under test.

Experimental Results:

Figure 2: Experimental Results

During the experiment, the signal generator outputs a 1 kHz acoustic wave signal. The power amplifier controls the voltage across the speaker, maintaining the output sound pressure within the range of 0–20 mPa. Three sets of acoustic sensors with different performance characteristics are tested, and the output voltages of the sensors are recorded. Under a 1 kHz acoustic field with sound pressures of 0–20 mPa, the output voltages of the three sensors exhibit sinusoidal waveforms, with amplitudes increasing as the sound pressure rises. Among them, the sensor with the highest sensitivity produces a peak-to-peak output voltage of 10 mV at 20 mPa sound pressure (indicated by the red curve in the figure).

Power Amplifier Recommendation: ATA-309C Power Amplifier

Figure: ATA-309C Power Amplifier Specifications

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