Fiber Optic Strain Sensing for MMOD Impact Detection
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Solution Overview
Problem
Current methods for detecting micrometeoroid and orbital debris (MMOD) impacts on spacecraft are inefficient, relying on visual inspection and unable to precisely determine the location and severity of impacts, posing a risk to both crewed and uncrewed vehicles in low Earth orbit.
Innovation Solution
A strain-sensing apparatus using fiber optic sensors, such as fiber Bragg grating (FBG) and Rayleigh scattering, attached to the MMOD shielding layer to detect and quantify the occurrence, location, and severity of MMOD strikes, enabling structural health monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If visual inspection is used to detect MMOD impacts, then the location of debris strikes can be identified, but the timing and precision of impact detection are insufficient
Solution Approach 1:
The patent replaces manual visual inspection with fiber optic strain sensing technology. The fiber optic sensors detect mechanical strain caused by MMOD impacts, enabling automated, real-time detection of both location and timing without human intervention or visual inspection limitations.
Solution Approach 2:
The patent introduces fiber optic sensors as intermediaries between the MMOD shielding layer and the detection system. These sensors convert mechanical impact events into optical signals, enabling precise measurement of strain, location, and timing information that would otherwise be inaccessible.
2Productivity
If fiber optic strain sensing is implemented, then real-time impact detection and location are achieved, but device complexity increases
Solution Approach 1:
The fiber optic sensing system performs multiple functions simultaneously: it detects impact occurrence, determines timing, identifies location, and assesses severity all through a single integrated sensing network. This multi-functionality increases productivity while the distributed nature of the sensors keeps individual component complexity manageable.
Solution Approach 2:
The sensing system is divided into distributed fiber optic sensors placed throughout the MMOD shielding layer. Each sensor independently detects local strain events, and the data is aggregated to determine overall impact characteristics. This segmentation allows complex detection capabilities to be achieved through simple, distributed components rather than a single complex system.
3Reliability
If manual visual inspection is performed, then spacecraft can be inspected for damage, but crew time and vehicle assets are consumed
Solution Approach 1:
The spacecraft's MMOD shielding layer performs self-diagnosis through the embedded fiber optic sensors. The system automatically detects impacts, records timing and location data, and provides damage assessment information without requiring manual inspection, thereby maintaining reliability while eliminating the need for crew time and vehicle assets.
4Difficulty of detecting and measuring
If acoustic emission sensors are used, then impact detection is possible, but location and severity quantification are insufficient
Solution Approach 1:
The patent replaces acoustic emission sensing with fiber optic strain sensing. Optical sensors directly measure mechanical strain in the shielding layer, providing superior precision for both location and severity quantification compared to acoustic methods, while maintaining the ability to detect impact occurrence.
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 accurate detection and location of MMOD strikes, reducing the need for manual inspections and providing timely data for damage assessment and remediation, enhancing the safety and reliability of spacecraft in high-risk environments.
Implementation Method 1
Example direct contact sensing techniques may include the use of strain gauges and fiber optic sensors, such as sensors using fiber Bragg grating (FBG) sensing
Implementation Method 2
Example direct contact sensing techniques may include the use of strain gauges and fiber optic sensors, such as sensors using fiber Bragg grating (FBG) sensing and/or sensors using Rayleigh scattering sensing
Implementation Method 3
In various embodiments, the strain measurements may also include acoustic emission (AE) measurements which may enable the location of the impact to be determined
Data Source
AI summary
Various embodiments may provide a strain-sensing apparatus configured to be attached to a micrometeoroid and orbital debris (MMOD) shielding layer and data collection equipment in communication with the strain-sensing apparatus configured to detect an occurrence, a time, a location, and/or a severity of a MMOD strike on the MMOD shielding layer. The various embodiments may enable detection and/or location of potentially harmful MMOD strikes on both human occupied and unmanned spacecraft.