Laser Backscatter Detection of Insect Wing-Beat Frequencies
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Solution Overview
Problem
Existing methods for detecting insects and landmines are limited by their inability to perform remote detection in cluttered environments, as they rely on sunlight or direct light sources, leading to high false alarm rates and difficulty in distinguishing between insects and vegetation or other objects.
Innovation Solution
A system utilizing backscattered laser light to detect insect wing-beats, allowing for remote detection and identification of insects by isolating their modulated signal from other objects through temporal-frequency filtering, enabling detection in any direction and in environments with vegetation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If transmitted light or sunlight is used for insect detection, then detection can be performed with simple equipment, but remote detection in cluttered environments is not possible and false alarm rates are high
Solution Approach 1:
The patent introduces laser light as an intermediary between the detection system and the target insects. The laser provides coherent, monochromatic light that scatters off insect wings with preserved temporal modulation, enabling remote detection through the wing-beat frequency signature while filtering out background clutter from vegetation and other objects.
Solution Approach 2:
The patent changes the optical parameters by using laser light with specific properties (coherence, monochromaticity) instead of broadband sunlight or transmitted light. This parameter change enables the detection system to resolve temporal modulations at insect wing-beat frequencies while rejecting scattered light from stationary or slowly moving background objects.
2Length of stationary object
If transmitted light measurement is used, then insects can be detected when flying through the light beam, but detection is limited to a small region and cannot perform remote detection with significant standoff distances
Solution Approach 1:
The patent transitions from a transmitted-light geometry (requiring the detector to be positioned across the measurement region from the source) to a backscatter geometry where the detector is co-located with the laser source. This dimensional change enables remote detection along the laser beam path without requiring the detector to be positioned in a specific location relative to the measurement region.
3Reliability
If wing-beat frequency detection is performed in cluttered environments, then detection of insects can be attempted, but false alarm rates increase due to inability to distinguish insects from vegetation and other objects
Solution Approach 1:
The patent exploits the mechanical vibration of insect wings at characteristic frequencies (wing-beat frequencies) as a unique signature. By detecting temporal modulations in the scattered laser light at these specific frequencies, the system can distinguish flying insects from stationary vegetation and other background objects that do not produce similar high-frequency modulations.
Solution Approach 2:
The patent employs signal processing that analyzes the temporal frequency content of the scattered light signal and uses the known wing-beat frequency range as a reference. This feedback mechanism allows the system to selectively enhance signals at insect-relevant frequencies while suppressing background clutter, thereby reducing false alarms in complex environments.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables long-distance remote detection and identification of insects and other moving objects, reducing false alarms and improving detection accuracy in cluttered environments, while allowing for the use of trained insects to locate specific objects like explosives.
Implementation Method 1
laser light scattered by the moving wings of insects in flight is detected
Implementation Method 2
wing-beat modulation of either sunlight or light from a Light Emitting Diode (LED), halogen lamp, or other broadband artificial light source
Data Source
AI summary
The present invention provides systems and methods using a temporal-frequency sensitive receiver to detect laser light that is scattered by an oscillating object, thereby allowing remote monitoring of the object's position and movement.