Optical Detection System for High-Voltage Devices
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Solution Overview
Problem
Existing optical detection systems for high-voltage devices face challenges with electromagnetic interference due to electrical signal transmission, which is unsafe and inconvenient, especially when a long optical path is required for high detection capability or weakly absorptive gases.
Innovation Solution
An optical detection system that uses a measurement gas chamber and host connected via a collimator and reflector, transmitting laser signals instead of electrical signals, avoiding electromagnetic interference and ensuring safety by using a mounting flange compatible with high-voltage devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the optical path length is increased to improve detection precision for high detection capability or weakly absorptive gases, then the detection precision is improved, but the laser beam diverges during propagation making it difficult to focus within the optical fiber core diameter
Solution Approach 1:
The patent transforms the linear optical path into a multi-pass folded path using mirrors, effectively increasing the optical path length within a compact spatial footprint. This allows the laser to traverse the measurement chamber multiple times, enhancing detection precision without requiring a proportionally long physical device length.
Solution Approach 2:
The optical system is integrated within a housing that contains multiple optical components (mirrors, beam splitter, detectors) in a nested arrangement. The measurement chamber is positioned within the housing, and optical fibers are routed through the housing structure, creating a compact nested configuration that accommodates the extended optical path.
2Measurement precision
If the optical path length is increased to improve detection precision, then the detection precision is improved, but the collimated light beam diverges gradually during propagation requiring the detector to be disposed in the gas chamber
Solution Approach 1:
The detector is extracted from the high-voltage gas chamber environment and positioned outside in the housing. Optical fibers transmit the laser beam through the chamber walls and the absorbed light signal back to the detector, eliminating the need to place electronic detection components within the high-voltage environment while maintaining extended optical path length for improved precision.
Solution Approach 2:
Optical fibers serve as intermediaries to transmit both the incident laser beam into the measurement chamber and the absorbed light signal back to the detector. This intermediary transmission mechanism allows the detector to remain outside the high-voltage chamber while still measuring the absorption that occurs within the extended optical path inside the chamber.
3Measurement precision
If the detector is disposed in the gas chamber to convert optical signal into electrical signal, then the optical signal can be converted, but the electrical signal is vulnerable to electromagnetic interference from the high-voltage device
Solution Approach 1:
The detector is extracted from the high-voltage gas chamber environment and positioned outside in the housing. Optical fibers transmit the laser beam through the chamber walls and the absorbed light signal back to the detector, eliminating the need to place electronic detection components within the high-voltage environment while maintaining extended optical path length for improved precision.
Solution Approach 2:
The patent replaces electrical signal transmission with optical signal transmission through optical fibers. The laser light carries the measurement signal through the chamber walls and back to the detector optically, avoiding electrical connections that would be vulnerable to electromagnetic interference from the high-voltage device.
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
This solution enables safe and precise detection of decomposition products without electrical signal transmission, maintaining the insulation properties of high-voltage devices and simplifying field measurements using a single optical fiber.
Implementation Method 1
Laser can be directly focused within a core diameter of an optical fiber after absorption by the gas. After transmission over the optical fiber, an optical signal is converted into an electrical signal
Implementation Method 2
After the laser is transmitted over a long distance, a relatively large spot is generated due to divergence
Implementation Method 3
an optical signal is converted into an electrical signal by using an optical-to-electrical converter in a device host
Implementation Method 4
the absorption principle is based on the Beer-Lambert law, where the detection precision is directly proportional to the optical path length
Data Source
AI summary
Disclosed is an optical detection system for detecting a decomposition product of a high-voltage device, including: a measurement gas chamber and a measurement host. The measurement gas chamber is disposed on the high-voltage device and is in communication with a gas chamber of the high-voltage device, a collimator and a reflector are disposed on two sides of the measurement gas chamber respectively, and the measurement host is connected to the collimator. The collimator is used for emitting measurement laser to the measurement gas chamber according to a laser signal sent by the measurement host, and receiving reflected laser from the reflector and transmitting the reflected laser to the measurement host. In the present invention, data collection and backhaul between a measurement host and a measurement gas chamber are implemented through a laser signal, thus avoiding electromagnetic interference and improving the safety of measurement for a high-voltage device.