Automated HEPA Filter Integrity Testing Apparatus
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Solution Overview
Problem
Current manual HEPA filter integrity testing methods in radionuclide generator hot cells and isolators are inefficient, prone to damage, and pose safety risks due to difficult access, inconsistent scanning, and the need to manually handle diffusion grids, which can cause damage and increase testing time.
Innovation Solution
An automated filter integrity testing apparatus with a scan module and multiple scan probes that move in a controlled manner to cover the entire HEPA filter face and associated seals, allowing for continuous gas sampling and aerosol detection without manual contact or removal of diffusion grids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual scanning probe method is used to test HEPA filter integrity, then the filter face can be scanned for leakage, but the operator exposure to radiation and hazardous chemicals increases
Solution Approach 1:
The patent replaces the manual mechanical scanning probe system with an automated robotic arm system that can be operated remotely or autonomously. The robotic arm carries the scanning probe and moves it across the HEPA filter face without requiring operator presence in the contaminated environment, thereby eliminating operator exposure to radiation and hazardous chemicals while maintaining reliable filter integrity certification.
Solution Approach 2:
The patent introduces a robotic arm as an intermediary between the operator and the HEPA filter testing process. The operator controls the robotic arm from a safe location, and the robotic arm performs the actual scanning probe movements across the filter face, serving as a mediator that transfers the testing function while isolating the operator from harmful environmental factors.
2Reliability
If hand-held probe is used for manual scanning, then the filter face can be inspected, but the filter membrane may be damaged by probe contact
Solution Approach 1:
The patent replaces manual probe handling with an automated robotic arm system that provides precise, programmable control over probe positioning and movement. The robotic system can be programmed to maintain optimal probe-to-filter distance and follow predetermined scan paths, eliminating the inconsistent manual movements that cause probe contact and potential damage to the delicate filter membrane while ensuring reliable integrity testing.
Solution Approach 2:
The patent incorporates feedback mechanisms in the automated robotic system that monitor probe position and filter surface characteristics in real-time. This feedback allows the system to automatically adjust probe positioning and movement speed to prevent contact with the filter membrane, while maintaining consistent scanning coverage for reliable filter integrity testing.
3Measurement precision
If manual scanning is performed by moving probe across filter face, then leakage can be detected, but the scanning rate and probe distance are inconsistent
Solution Approach 1:
The patent replaces manual probe scanning with an automated robotic arm system programmed with precise motion control algorithms. The system follows predetermined scan paths with exact positioning and consistent movement speed, maintaining optimal probe-to-filter distance throughout the scanning process. This automation ensures uniform scanning coverage and consistent measurement conditions, thereby improving aerosol detection accuracy while eliminating the variability inherent in manual operation.
Solution Approach 2:
The patent employs preliminary programming of the robotic arm with predetermined scan paths and positioning parameters before actual filter testing begins. The scan routes, probe distances, and movement speeds are pre-calculated and stored in the system memory, ensuring that when testing commences, the robotic arm automatically executes consistent, repeatable scanning motions that maintain optimal measurement conditions throughout the entire filter face inspection.
4Ease of operation
If diffusion grid or membrane is manually removed to access HEPA filters, then filter testing can be performed, but the handling can cause damage to filters and grids/membranes
Solution Approach 1:
The patent introduces a long-reaching robotic arm with extended reach capabilities that can access and scan the HEPA filter face through the diffusion grid or membrane structure without requiring its removal. The robotic arm acts as an intermediary tool that bridges the gap between the operator's safe location and the difficult-to-reach filter surface, enabling testing while preserving the integrity of both the filters and the diffusion grid/membrane structures.
Solution Approach 2:
The patent employs a robotic arm with extended reach and multi-axis movement capabilities that approaches the HEPA filter face from alternative spatial dimensions and angles. Rather than requiring linear access from the front that would necessitate grid removal, the robotic system can navigate around obstructions and reach the filter surface through three-dimensional space, eliminating the need to handle or remove the diffusion grid/membrane while still achieving complete filter face coverage.
5Ease of operation
If manual handling of diffusion grids or membranes is required, then access to HEPA filters is achieved, but testing time and process cycle time increase
Solution Approach 1:
The patent introduces a robotic arm system that can access and scan HEPA filters without requiring the removal or manual handling of diffusion grids or membranes. The robotic arm serves as an intermediary that performs testing through the existing grid/membrane structure, eliminating the time-consuming steps of careful removal, testing, and reinstallation while maintaining complete filter accessibility and integrity.
Solution Approach 2:
The patent enables continuous, uninterrupted filter testing by eliminating the discontinuous steps of manual grid/membrane removal and reinstallation. The robotic arm system maintains continuous scanning motion across the entire filter face in a single automated operation, keeping the diffusion grid/membrane in place throughout the process and thereby eliminating idle time and maintaining productive workflow continuity.
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 solution provides a consistent, safe, and efficient method for testing HEPA filter integrity, reducing operator exposure, minimizing filter damage, and enabling testing within small or obstructed spaces without removing diffusion grids, thus improving access and reducing testing time.
Implementation Method 1
The probe draws a continuous air sample during this scanning process that is monitored for presence of aerosol
Data Source
AI summary
HEPA filter integrity testing apparatus including an automated mover, a scan module connected to the automated mover, and scan probes disposed along the length of the scan module. Assemblies also include HEPA filters and the filter integrity testing apparatus. A method of determining the integrity of HEPA filters with the filter integrity apparatus is disclosed.