Removable Photodiode Case With Captive Filter Retention
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Solution Overview
Problem
Existing designs of photo diode sensor cases for High Energy Laser Weapon Systems (HELWS) fail to securely contain neutral density filters and diffusers, leading to potential debris and loose parts, which can cause damage and create Foreign Object Debris (FOD) in environments with moving parts.
Innovation Solution
A removable photo diode case with a hingeable door and captive screws or press-fit pins for securing filters, along with a clipper ring assembly that includes beam dumps and reflective knife edges to direct laser energy into cavities or sensors, ensuring uniform illumination and preventing filter movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If neutral density filters and diffusers are used to ensure uniform illumination of the photo diode, then the illumination uniformity is improved, but the risk of component damage and FOD increases due to loose parts
Solution Approach 1:
The patent implements nesting by placing the neutral density filters and diffusers inside a dedicated case structure. The case contains these components in a nested arrangement where the filters are mounted on the diffuser assembly, which itself is mounted within the case. This nested configuration ensures that all components are securely contained while maintaining optical access to the photo diode, thereby achieving uniform illumination without the risk of loose parts causing damage or FOD.
2Ease of manufacture
If the photo diode case design is simplified, then the ease of manufacture is improved, but the ability to securely contain filters and prevent FOD deteriorates
Solution Approach 1:
The patent applies segmentation by dividing the case into distinct functional modules: a main case body, a removable door assembly, and a filter mounting assembly. The door can be separated from the case, and the filters can be accessed through the door opening. This segmented design maintains manufacturing simplicity by using standard case construction techniques while providing secure containment for filters and preventing FOD through the removable door mechanism that can be closed to seal the contents.
3Reliability
If the photo diode case is made secure to prevent FOD, then the reliability is improved, but the ease of operation for filter replacement deteriorates
Solution Approach 1:
The patent implements dynamics by providing a removable door that can be opened and closed. The door is hinged or latchable to the case body, allowing operators to easily open it for filter replacement and then close it to secure the filters inside. This dynamic element maintains reliability by ensuring the door can be securely closed to prevent FOD, while simultaneously improving ease of operation by allowing quick access to the filters when needed.
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 effectively contains filters and prevents debris, ensuring reliable operation of the HELWS by maintaining uniform illumination and preventing damage to the photo diodes, thus enhancing safety and reducing the risk of FOD.
Implementation Method 1
a knife edge (this is the reflective/optical component that reflects incident laser energy onto the sensor)
Implementation Method 2
Both ring beam dumps are machined on opposing sides so that when bolted together, they form cavity pockets that act as Lambertian scatterers
Implementation Method 3
The purpose of these Photo Diode sensor is to detect scattered laser energy and send a signal to the HWAS controller
Data Source
AI summary
A safety apparatus that includes a case, a diode sensor secured within the case, and a fastener for removably securing the case to a laser safety clipper ring.