Laser Profilometry Object Identification
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Solution Overview
Problem
Current profilometric identification methods for 3D objects, such as aircraft, using radar signatures are not sufficiently precise due to intense but few peaks, making it difficult to discriminate between objects with similar profiles.
Innovation Solution
A method involving the acquisition of profilometric signatures using a pulsed laser beam with a length at least 10 times shorter than the object, incorporating coherent and incoherent components, and processing through Shepp-Logan filtering and centered moments to enhance discrimination, along with database creation through digital simulation and facetization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If radar profilometry is used to identify 3D objects, then identification can be performed, but the signature contains very intense but few peaks which are not sufficiently precise to discriminate between objects with similar profiles
Solution Approach 1:
The patent segments the electromagnetic wave interaction by separating coherent reflection components from incoherent diffusion components in the profilometric signature. This segmentation allows both components to be processed and combined, preserving detailed information that would be lost in traditional radar profilometry which only captures intense peaks.
2Measurement precision
If a pulsed laser beam with very short length is used, then more precise profilometric signature can be obtained, but the device complexity increases
Solution Approach 1:
The patent replaces complex mechanical radar systems with an optical laser-based profilometry system. By using optical waves instead of radio waves, the system achieves higher precision measurements while the complexity is managed through digital signal processing of coherent and incoherent components rather than complex hardware modifications.
3Ease of operation
If traditional radar signatures with few intense peaks are used, then acquisition is simple, but discrimination between similar objects is difficult
Solution Approach 1:
The patent adds a new dimension to the profilometric signature by incorporating both coherent reflection components and incoherent diffusion components. This dimensional expansion of the signature space provides richer information for object discrimination while maintaining the simplicity of laser-based acquisition, transforming a one-dimensional intensity measurement into a multi-component signature.
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
This approach provides more accurate and stable signatures, enabling better discrimination between objects by increasing the signal-to-noise ratio and reducing confusion between similar profiles.
Implementation Method 1
pointing at the object a pulsed laser beam of length Li
Implementation Method 2
the signature comes from the back-scattering of the electromagnetic wave by the object
Implementation Method 3
a coherent component representative of the reflection of the laser beam on the object
Implementation Method 4
an incoherent component representative of the diffusion of the laser beam on the object
Data Source
Figure 1a~1b
Figure 2
Figure 3~4
AI summary
The invention concerns a method for identifying an object by profilometry including a step of acquiring a profilometric signature of the object and a step of comparing a signature of the object representing the acquired signature with signatures of a database. The profilometric signature of the object is obtained by pointing on the object a pulsed laser beam of length L1, said length L1 being at least 10 times shorter than the length R1, of the object considered along the pointing axis of the laser.