ESD Detection on Solar Panels via Current Profile Matching
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Solution Overview
Problem
Current technologies lack effective methods to detect and locate the origin of electrostatic discharges (ESD) on space systems, such as solar panels, which are a significant cause of anomalies leading to communication interference, material degradation, power loss, and damage to electronic components.
Innovation Solution
A computer-implemented system that monitors time-varying current data to detect ESD and determines the origination location by comparing the current profile to a catalog of ESD current profiles specific to different locations on the surface, using current probes and programmable ESD detection/location systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If no ESD detection system is implemented, then the system avoids added complexity and weight, but the ability to detect and locate ESD events is lost
Solution Approach 1:
The solar panel structure itself serves as the detection system by utilizing its existing conductive grid pattern. The panel's own electrical characteristics are exploited to detect ESD events, eliminating the need for separate detection hardware and reducing system complexity while maintaining reliability
Solution Approach 2:
The conductive grid on the solar panel serves dual purposes: its original function for electrical connectivity and a new function as an ESD detection network. This multi-functionality allows the same structure to perform both power generation and anomaly detection without adding dedicated detection components
2Measurement precision
If comprehensive ESD detection coverage is implemented, then detection precision improves, but the quantity of sensors and system complexity increases
Solution Approach 1:
The solar panel surface is divided into multiple segments corresponding to individual solar cells or groups of cells. Each segment acts as an independent detection zone, allowing precise localization of ESD events to specific regions without requiring continuous sensor coverage across the entire panel surface
Solution Approach 2:
The detection system transitions from a two-dimensional array of sensors on the panel surface to a one-dimensional electrical measurement approach. By measuring current or voltage changes along the conductive grid lines, the system locates ESD events through electrical potential differences rather than spatial sensor distribution
3Reliability
If real-time ESD monitoring is implemented, then operational reliability improves, but energy consumption increases
Solution Approach 1:
The ESD detection system operates continuously by monitoring the existing electrical currents flowing through the solar panel's conductive grid during normal operation. The same electrical pathways used for power generation are utilized for detection, eliminating the need for separate power-consuming detection circuits and enabling continuous monitoring with minimal additional energy consumption
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 real-time detection and localization of ESD events on spacecraft surfaces, improving operational procedures and identifying weak points in design before deployment, with minimal additional hardware required, thus reducing weight and enhancing reliability.
Implementation Method 1
Electrostatic discharges (ESD) on solar cells are triggered when electrical field strengths become high enough to induce the transport of charges
Implementation Method 2
a programmed computer device monitors time-varying current data, i.e., current transients, related to the surface to detect ESD on the surface
Data Source
AI summary
Computer-implemented systems and methods for detecting ESD on a surface and determining an origination location of the ESD. A programmed computer device monitors time-varying current data related to the surface to detect ESD on the surface. The current profile for the surface may be compared to a catalog of ESD current profiles, where each ESD current profile in the catalog corresponds to a different location on the surface. The location on the surface whose corresponding ESD current profile best matches the actual current profile from the ESD may be determined to be the origination location of the ESD. Moderately different processes may be used to determine the ESD origination location depending on whether the surface is symmetrical or irregular, flat or curved, etc.