Affordable Bimodal Optical Sensors to Spread the Use of Automated Insect Monitoring

Figure 8

The harmonic detector applied to recordings of the e-trap. (a) a true positive case. Time in sec and y-axis of audio signals normalized between [−1, 1]. Note the characteristic wingbeat frequency at 200 Hz. (b) a nontarget, wingbeat signal rejected (SNR < 0) for not having the f₀ and its associated harmonics in the spectral area where B. oleae is expected. (c) a rejected interference (SNR < 0).

(a)

(b)

(c)