Optical Inspection System for Munitions Defect Detection
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Solution Overview
Problem
Current automatic inspection methods for small arms ammunition cartridges and threaded fasteners are inadequate in detecting defects such as splits, dents, and surface blemishes, as they lack precision and efficiency in classifying defects according to military standards, particularly for small caliber ammunition.
Innovation Solution
A method and system for optically inspecting parts using a telecentric lens and detector assembly, which illuminates multiple exterior side surfaces with separate beams of radiation, forming optical images, and processing these images to identify defects like dents, splits, and surface blemishes, utilizing a processor to obtain multiple views of the part for accurate defect detection and measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional manual gauging devices and techniques are used for inspection, then the inspection process is simple to operate, but the inspection precision and efficiency are insufficient for detecting defects like splits, dents, and surface blemishes
Solution Approach 1:
The patent replaces traditional manual mechanical gauging devices with an automated optical inspection system that uses multiple radiation beams, telecentric lenses, and digital image processing to detect defects. This substitution enables precise detection of splits, dents, and surface blemishes while maintaining operational simplicity through automated processing.
Solution Approach 2:
The inspection system divides the inspection process into multiple independent viewing angles using separate radiation beams and optical paths. Each beam inspects a specific side surface of the part, and the images are processed independently before being combined, allowing precise defect detection on complex geometries without requiring a single complex inspection path.
2Productivity
If automatic inspection methods are implemented to improve efficiency, then the inspection speed increases, but the ability to accurately classify defects according to military standards deteriorates
Solution Approach 1:
The patent replaces manual defect classification with automated digital image processing that compares inspected features against stored military standard criteria. The system processes images from multiple angles and automatically determines compliance with standards such as MIL-STD-636, maintaining both high speed and accurate classification.
Solution Approach 2:
The system creates digital copies of the part's surface features through optical imaging and stores reference images representing acceptable and defective conditions. These digital copies are processed and compared against military standards to automatically classify defects, enabling fast and accurate decision-making without manual intervention.
3Reliability
If multiple views of the part are obtained to improve defect detection coverage, then the inspection completeness increases, but the processing time and system complexity increase
Solution Approach 1:
The system simultaneously captures multiple views of the part using separate radiation beams that illuminate different side surfaces at different angles. Each beam and its associated optical path operate independently and concurrently, providing complete defect detection coverage without requiring sequential imaging that would increase inspection time.
Solution Approach 2:
The patent merges multiple independent inspection paths into a single integrated system that processes all views simultaneously. The radiation beams, optical components, and image processing operations are coordinated to deliver complete defect detection in one inspection cycle, preventing time loss despite the multiple viewing angles required for comprehensive coverage.
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
The system provides precise and efficient detection of defects, enabling accurate classification of parts as defective or non-defective, improving the quality control in the munitions industry by ensuring compliance with military standards.
Implementation Method 1
a telecentric lens and detector assembly to form an optical image of at least a portion of each of the illuminated side surfaces and to detect the optical images
Implementation Method 2
Each of the illuminated side surfaces includes a pair of spaced apart lateral edges of the part
Data Source
AI summary
A method and system for optically inspecting parts are provided wherein the system includes a part transfer subsystem including a transfer mechanism adapted to receive and support a part at a loading station and to transfer the supported part by a split belt conveyor so that the part travels along a first path which extends from the loading station to an inspection station at which the part has a predetermined position and orientation for inspection. An illumination assembly simultaneously illuminates a plurality of exterior side surfaces of the part with a plurality of separate beams of radiation. A telecentric lens and detector assembly forms an optical image of at least a portion of each of the illuminated side surfaces of the part and detects the optical images. A processor processes the detected optical images to obtain a plurality of views of the part which are angularly spaced about the part.