Ruggedized Fiber-Coupled Sensor Packaging for Harsh Environments
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Solution Overview
Problem
Current photonic crystal sensor packaging is not suitable for harsh environments due to exposure of optical fibers and sensors, limiting their application in aerospace and other challenging conditions.
Innovation Solution
A ruggedized photonic crystal sensor packaging method involving hermetic sealing with high-temperature solders, metalizing, and active/passive fiber alignment techniques, using ceramic or metal components to protect the sensors from environmental interference and ensure reliable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hermetic sealing with high-temperature solders and metalizing is used, then reliability and protection from environmental interference is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The packaging is divided into distinct functional segments: a hermetically sealed housing containing the photonic crystal sensor, a separate fiber coupling mechanism, and protective mounting structures. This segmentation allows each component to be optimized independently for its specific function while maintaining overall system reliability in harsh environments.
Solution Approach 2:
The photonic crystal sensor and optical fiber are pre-aligned and pre-assembled within the hermetic housing before final deployment. This preliminary action ensures precise optical coupling is achieved during manufacturing, eliminating the need for complex field alignment procedures and reducing overall system complexity.
2Measurement precision
If active fiber alignment techniques are used, then measurement precision is improved, but manufacturing time and cost increase
Solution Approach 1:
The packaging incorporates self-aligning features such as precision-machined V-grooves and registration features that automatically guide the optical fiber into correct alignment with the photonic crystal sensor during assembly. This self-service alignment mechanism achieves high precision without requiring complex active alignment equipment or skilled operators.
Solution Approach 2:
Complex active alignment mechanisms are replaced with passive mechanical alignment features integrated into the hermetic housing structure. The precision alignment is achieved through carefully designed mechanical interfaces rather than active adjustment mechanisms, thereby simplifying the manufacturing process while maintaining measurement precision.
3Object-affected harmful factors
If ceramic or metal components are used for hermetic sealing, then protection from corrosive fluids and EMI is improved, but weight and manufacturing cost increase
Solution Approach 1:
The hermetic housing employs composite construction combining corrosion-resistant materials with appropriate shielding properties. This may include metal-ceramic composites or metal alloys with integrated EMI shielding layers, providing protection against corrosive fluids and electromagnetic interference while minimizing weight compared to solid metal constructions.
Solution Approach 2:
EMI shielding and corrosion protection are applied locally only where needed rather than throughout the entire package. For example, EMI shielding is concentrated around the photonic crystal sensor and fiber coupling regions, while corrosion-resistant coatings are applied selectively to external surfaces exposed to harsh environments, reducing overall material usage and weight.
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 photonic crystal sensors to operate in extreme conditions, reducing weight, cost, and improving performance by shielding against electromagnetic interference, corrosive fluids, and mechanical vibrations, making them suitable for remote sensing in aerospace applications.
Implementation Method 1
a self-alignment process that utilizes the surface tension of reflowed solder to center the sensor chip to a center axis of the front snout automatically when the solder is cooled and solidified
Implementation Method 2
Vacuum tight hermetically sealed fiber coupled sensor packages
Data Source
Figure 1A~1C
Figure 2A~2B
Figure 3
AI summary
A method, system, and apparatus are disclosed for a ruggedized sensor packaging. In particular, the present disclosure teaches a ruggedized packaging for sensor chip (220) that includes of a hermetic-seal high-temperature jacket (292) and a ferrule (290) that eliminate the exposure of the optical fiber as well as the critical part of the sensor (220) to harsh environments. The disclosed packaging methods enable sensors (220) to operate in challenging environments where adverse environmental conditions, such as electromagnetic interference (EMI), corrosive fluids, large temperature variations, and strong mechanical vibrations, currently exclude the use of traditional sensor technologies. The packaging comprisses a housing base (240) closed by a lid (280) with chip and fibre (292) coupled to corresponding tube extensions (250, 260) of the housing base. The fibre is sealed off by solder (265) and a high temperature epoxy (297) and covered by boot (295). The sensor ship is sealed into the housing tube via a solder. The fibre end is aligned towards the sensor ship and held in this position by solder bond to a pedestal (270).