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

Figure 2

Sensor. (a) The prototype stereo sensor recording extinction and scattered light simultaneously stemming from the same wingbeat event. Opposite (a, b) circular Fresnel lenses are coupled as emitter-receiver of collimated light (extinction radiation). The central lens has at its opposite side a black termination cavity. The central lens receives scattered light from the emitter on the left. The flying insect passes through the funnel that the Fresnel lenses create. (b) An internal view of the prototype recorder.

(a)

(b)