Abstract
The proposed new method partially solves the problem of low SNR when modulation frequency increases. In the manuscript, the authors suggest to keep constant the amplitude of the detected photoacoustic (PA) signal by linearly increasing the modulation voltage versus frequency. This technique decreases the SNR at low frequencies but increases the SNR in the usual noisy band and the PA signal of the sample can be easily estimated by FFT. It is also demonstrated that the presented technique is able to detect a subsurface defect in a graphite sample in the 10–100 Hz frequency range.
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