Optical Sensor Environmental Protection for Drive-Over Tread Depth Measurement
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Solution Overview
Problem
Optical sensors in drive-over configurations are vulnerable to environmental contaminants such as dust, dirt, rocks, and water, which accumulate on optically transparent panels and obstruct the optical lines of sight, leading to performance degradation.
Innovation Solution
The implementation of a mechanism with selectively movable shutter panels, passive components like drip edges and flow diverters, and an automated air cleaning system to prevent and clear contaminants from the optical surfaces, ensuring the sensors remain operational.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If optical sensors are disposed in drive-over configuration for tire condition monitoring, then data acquisition capability is improved, but vulnerability to environmental contaminants increases
Solution Approach 1:
A transparent cover plate is introduced as an intermediary element between the optical sensor and the environment. The cover plate allows optical signals to pass through while providing a protective barrier against environmental contaminants such as water, dust, and debris, thus resolving the contradiction between exposure for data acquisition and protection from harmful factors.
Solution Approach 2:
The system performs preliminary cleaning actions by detecting contaminant accumulation on the cover plate and automatically activating a cleaning mechanism (such as a wiper or air blow) to remove contaminants before they significantly degrade sensor performance. This preemptive approach maintains optical clarity while preserving the drive-over configuration's data acquisition capability.
2Reliability
If sealed housing is used to protect optical sensors from water and debris intrusion, then protection against environmental damage is improved, but accumulation of environmental contaminants on optical panels increases
Solution Approach 1:
The system incorporates a self-cleaning capability where the optical sensor assembly automatically detects and removes contaminants from its own cover plate. A cleaning mechanism (wiper or air blow) is activated when contamination is detected, enabling the system to maintain its own optical performance without external intervention, thus balancing protection with contaminant removal.
Solution Approach 2:
The cleaning mechanism operates periodically or on-demand based on contamination detection rather than continuously. The system monitors the optical path for signs of contamination and activates the cleaning mechanism at appropriate intervals, energy-efficiently maintaining optical clarity while preserving the sealed housing's protective function.
3Ease of operation
If optically transparent panels are exposed for sensor operation, then optical line of sight is maintained, but performance degradation from contaminant accumulation occurs
Solution Approach 1:
The transparent cover plate serves as a mediator that separates the optical path from direct environmental exposure. It maintains optical transparency for sensor operation while providing a removable or cleanable surface that protects the underlying sensor components, resolving the contradiction between maintaining optical line of sight and preventing performance degradation.
Solution Approach 2:
The system automatically monitors and maintains the optical clarity of the cover plate through integrated cleaning mechanisms. When contamination is detected, the system self-corrects by activating the cleaning mechanism, ensuring continuous optimal performance without manual intervention and maintaining the balance between exposure and protection.
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
The solution effectively shields the optical sensors from environmental debris, maintaining their performance by preventing contamination and periodically clearing accumulated debris, ensuring continuous data acquisition accuracy.
Implementation Method 1
The mechanism selectively discharges a stream of air across the surfaces to be cleared or cleaned, to blow environmental contaminates off the surfaces
Data Source
AI summary
A drive-over tire tread depth measurement system is configured with environmental protection components for preventing or impeding environmental contaminates from falling through openings in a vehicle support surface or cover plate onto underlying components such as sensor optical windows and adjacent surfaces. The environmental protection components may include air discharge assemblies, movable shields, guards, wipers or deflectors such as drip edges, water-accumulating textured surfaces, flow diverters, and selectively placed flanges or fixed guards which operate cooperatively to displace accumulated contaminates, debris, or liquids from the optical windows and adjacent sensor surfaces. A portion of the vehicle support surface or cover plate is removable to permit access to underlying components.