Arc Flash Sensor Lens Self-Test Mechanism
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Solution Overview
Problem
Existing arc flash detectors often fail to detect arc flashes due to dirt, dust, or other material accumulation on the sensor lens, leading to attenuation of light and improper operation.
Innovation Solution
An arc flash sensor design with a light emitter assembly outside the sensor housing generates a test signal that is transmitted through a transparent sensor lens to a light sensor within the housing, allowing for periodic checking of sensor integrity and maintenance to ensure clear lens conditions, preventing false negatives or delays in detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensor lens is exposed to ambient conditions for light detection, then light detection capability is improved, but dirt and dust accumulate on the lens causing attenuation and detection failure
Solution Approach 1:
The patent implements a test light source that periodically emits test light through the sensor lens before actual arc flash detection. This preliminary action allows the system to verify lens cleanliness and optical path integrity by measuring whether test light reaches the sensor, enabling proactive maintenance before detection failure occurs
Solution Approach 2:
The system continuously monitors the optical path by having the sensor detect light from the test light source. When attenuation is detected (indicating dirt accumulation), the system generates an alert or error signal. This feedback mechanism enables real-time monitoring of lens condition and triggers maintenance actions before detection reliability is compromised
2Reliability
If a light emitter assembly is added outside the sensor housing, then sensor integrity checking is enabled, but device complexity increases
Solution Approach 1:
The sensor lens serves dual functions: it acts as both the optical element for arc flash detection and the transmission medium for test light verification. The same lens that detects arc flash light also transmits test light from the external emitter to the internal sensor, eliminating the need for separate test optical paths and reducing overall system complexity
Solution Approach 2:
The test light source acts as an intermediary element that indirectly verifies lens cleanliness without requiring physical contact or disassembly. By emitting light through the lens and having the sensor detect it, the system uses light as a mediator to assess optical path integrity, simplifying the verification process compared to physical inspection methods
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 design ensures consistent and timely detection of arc flashes by maintaining the sensor lens in a clean condition, preventing attenuation and ensuring rapid response to arc faults.
Implementation Method 1
a light sensor disposed within the sensor housing, the light sensor arranged to generate a detection signal when light impinges on the light sensor
Implementation Method 2
a sensor lens disposed at least partially outside the sensor housing, wherein a distal portion of the sensor lens extends a first distance above the sensor housing, the sensor lens being transparent, wherein light received from outside the sensor housing is transmitted to the light sensor
Data Source
AI summary
An apparatus may include a sensor housing, a light sensor disposed within the sensor housing, the light sensor arranged to generate a detection signal when light impinges on the light sensor, a sensor lens disposed at least partially outside the sensor housing, wherein a distal portion of the sensor lens extends a first distance above the sensor housing, the sensor lens being transparent, wherein light received from outside the sensor housing is transmitted to the light sensor; and a light emitter assembly disposed outside the sensor housing at a second distance above the housing less than the first distance.