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

Figure 5

Optical wingbeat recording of a fly using two different modalities simultaneously (i.e., backscattered and extinction light). Recordings are treated as audio and the amplitude in y-axis is normalized between [−1, 1]. We used the sensor and recording device in Figure 2. At least 23 harmonics are identifiable in the spectrum of the scattered light modality. The quality of a scattered light recording is superior to that of an extinction light recording in terms of SNR and number of harmonics emerging over the noise floor.