The measured results are processed in Fourier domain. The signal and noise spectra of the 4 microphone/4 reflector have a combined SNR of 11.48 dB, while the results of 16-microphones/1-reflector have a combined SNR of 17.82 dB. The worse SNR result of the 4-phone/4-reflector system may not simply due to the other system has more microphones. It also because of the average effect of the full reflector area, which can blur the phase of each element and the noise, cannot be cancelled more exactly.
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Joshua Lay, Xing Chen, Fow-Sen Choa, "Performance comparison of microphone and reflector array structures for real-time and outdoor photoacoustic chemical sensing," Proc. SPIE 8710, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XIV, 871009 (29 May 2013);