Shadow Effect for Small Insect Detection by W-Band Pulsed Radar

Area of Science:

• Radar entomology
• Applied physics
• Pest management

Background:

• Detecting small insects (<5 cm) with radar is challenging due to weak signal reflections.
• Existing radar entomology literature shows limited success in sensing insects smaller than 5 cm.

Purpose of the Study:

• To develop and validate methodologies for detecting small insects, specifically Mediterranean fruit flies (5-6 mm), using pulsed W-band radar.
• To investigate the feasibility of using the shadow effect for insect detection.

Main Methods:

• Utilized a pulsed W-band radar system.
• Developed and tested methodologies for detecting Mediterranean fruit flies based on the shadow effect.
• Analyzed backscattered radar signals to identify changes caused by insect presence.

Main Results:

• Successfully detected Mediterranean fruit flies (5-6 mm) using the shadow effect.
• Observed an 11% difference in received radar power when flies were present, validating the method.
• This is the first reported instance of detecting insects less than 1 cm using pulsed W-band radar.

Conclusions:

• The shadow effect is a viable technique for detecting small insects with radar.
• This method offers a potential alternative to current sensors in smart traps for insect detection and counting.