Non-contact Discharge Test Using Light Emission Waveform Database
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Solution Overview
Problem
In lightning resistance tests for aircraft, existing methods face challenges in evaluating discharge or spark energy non-contactedly in poor electromagnetic noise environments, particularly with CFRP materials, where quantitative evaluation of light emission energy is difficult and locating explosions is hard.
Innovation Solution
A non-contact discharge test method using a database to correlate light emission and current waveforms, with a light emission measuring device and current measuring device shielded to detect weak light emissions and estimate discharge or spark energy based on intensity waveforms, employing an electromagnetic wave as a timing reference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If film cameras are used to capture light emission images, then discharge or spark detection is possible, but quantitative evaluation of light emission energy is difficult and multiple cameras are required
Solution Approach 1:
The patent replaces the mechanical film camera system with an optical detection system using photomultiplier tubes or photodiodes that directly convert light emission into electrical signals for quantitative measurement. This substitution enables precise energy evaluation through electrical signal processing while eliminating the need for multiple cameras and film development processes.
Solution Approach 2:
The patent introduces light-receiving elements (photomultiplier tubes or photodiodes) as intermediaries between the light emission source and the measurement system. These elements convert optical energy into electrical signals that can be quantitatively analyzed, serving as a mediator that bridges the gap between light emission phenomenon and measurable electrical parameters.
2Measurement precision
If light-receiving elements are used to detect light emission, then detection sensitivity is improved, but electromagnetic noise interference increases in lightning resistance tests
Solution Approach 1:
The patent creates an electromagnetically shielded environment using shielded rooms or Faraday cages to isolate the light-receiving elements from external electromagnetic noise. This shielded environment allows sensitive photomultiplier tubes or photodiodes to detect weak light emission signals from discharge or spark events without interference from the strong electromagnetic fields present during lightning resistance testing.
Solution Approach 2:
The patent extracts the light detection function from the electromagnetic measurement environment by using optical fibers to transmit light signals from the test area to the light-receiving elements located in shielded regions. This separation allows the sensitive detection components to operate in a low-noise environment while still monitoring the high-electromagnetic-noise test zone.
3Measurement precision
If multiple shielded measuring devices are used for synchronous measurement, then measurement accuracy is improved, but device complexity and space requirements increase
Solution Approach 1:
The patent combines multiple measurement functions into a single integrated system where photomultiplier tubes or photodiodes simultaneously detect light emission intensity, duration, and temporal characteristics. By merging these measurement capabilities into one shielded detection unit, the system achieves synchronous measurement accuracy without requiring multiple separate shielded devices.
Solution Approach 2:
The patent designs the light-receiving elements to perform multiple measurement functions simultaneously - detecting light intensity, measuring pulse duration, and determining temporal synchronization - all within a single shielded device. This multi-functionality reduces the total number of devices needed while maintaining measurement precision.
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 instantaneous evaluation of discharge or spark time, location, and magnitude without film development, effectively performing lightning resistance tests in poor electromagnetic noise environments.
Implementation Method 1
optically measuring a phenomenon of light emission due to the discharge or spark
Implementation Method 2
an electromagnetic wave generated as a result of the discharge or spark of the measurement object is detected, and the intensity waveform of the light emission of the discharge or spark generated from the measurement object is measured
Data Source
AI summary
In a non-contact discharge test performed in a poor electromagnetic noise environment, the energy of discharge is evaluated by detecting weak light emission and processing the intensity waveform of light emission of the discharge. A database is created by measuring the intensity waveform of light emission of discharge generated as a result of application of a voltage or current to a measurement object through use of a light emission measuring device, simultaneously measuring the current waveform of the discharge through use of a current measuring device, and storing in the database the relation between analysis data sets obtained through analysis of the waveforms on the basis of information of the voltage or current applied to the measurement object. The intensity waveform of the light emission of the discharge or spark generated from the measurement object is measured while an electromagnetic wave generated as a result of the discharge of the measurement object is used as a reference. The magnitude of the discharge is estimated as a value by comparing light emission data obtained through analysis of the intensity waveform with the data recorded in the database.