Compensation function for enhanced bandwidth and improved SNR through programmable spectral shape signals

Plant physiological parameters are of great importance for several applications, conventionally invasive or expensive approach is adopted. Using air-coupled resonant ultrasound application, portable, cheap and real time noninvasive approach is proposed. The solution proposed is based on arbitrary position and width pulse (APWP) sets instead of simple pulse excitation signal. The programmable spectral shape can be obtained for APWP, with acceptable SNR and increased bandwidth for attainable. The novelty of this approach is not only signal but real varying noise-based SNR compensation function. The compensation function is developed using programmable spectral shape-based excitation signals. This resulted in increased bandwidth, and improved SNR. The SNR using air-coupled transducers with Vitis vinifera leaf as sample where comparison is drawn between different excitation (pulse, linear frequency modulation (LFM), non-linear frequency modulation (NLFM)) signals and proposed APWP. Results shown significant improvement in the bandwidth from an initial 850 kHz to 1000 kHz.)