Self-Leveling Road Sensor Using Plastic Compression
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Solution Overview
Problem
Road sensors embedded in pavement surfaces face exposure and damage due to wear and tear from traffic and maintenance, compromising their measurement performance, especially in cold temperatures where reliable data is critical for safe traffic conditions.
Innovation Solution
A road sensor apparatus with a sensor casing and a plastic sensor level adjustment element that compresses under pressure, allowing the sensor to adjust its depth within a recess in the pavement, ensuring it remains embedded and avoids damage from traffic and maintenance impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensor is embedded in the road surface, then measurement performance is improved, but the sensor becomes exposed and susceptible to damage from traffic and maintenance operations
Solution Approach 1:
The sensor casing is made moveable within the installation sleeve, allowing it to dynamically adjust its position in response to pressure changes from traffic loads, transitioning between exposed and embedded states to balance measurement access with protection
Solution Approach 2:
The plastic sensor level adjustment element changes its compression state based on applied pressure, transitioning from a compressed to uncompressed state to adjust the sensor casing depth, thereby changing the sensor's exposure level to optimize both measurement performance and protection
2Ease of operation
If the sensor protrudes from the road surface, then accessibility for measurement is improved, but the sensor is exposed to increased impact from vehicles and maintenance equipment
Solution Approach 1:
The sensor casing moves dynamically within the installation sleeve in response to pressure, allowing the sensor to protrude when needed for measurement while retracting to avoid impact from vehicles and maintenance equipment
Solution Approach 2:
The sensor system automatically adjusts its own exposure level through the pressure-responsive plastic element, eliminating the need for manual intervention to protect the sensor from harmful impacts while maintaining measurement accessibility
3Reliability
If manual adjustment of sensor position is performed, then sensor protection is improved, but maintenance time and frequency requirements increase
Solution Approach 1:
The plastic sensor level adjustment element automatically adjusts the sensor casing position in response to pressure changes from traffic, providing self-protection without requiring manual intervention or maintenance time
Solution Approach 2:
The plastic adjustment element acts as an intermediary between the sensor casing and the installation sleeve, mediating the position adjustment automatically in response to pressure, thereby protecting the sensor without requiring direct manual handling
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 enables prolonged, uncompromised measurement performance by maintaining the sensor's position below the pavement surface, reducing exposure to traffic and maintenance impacts, and eliminating the need for frequent manual adjustments.
Implementation Method 1
the sensor level adjustment element comprising plastic material that exhibits permanent compression in response to being subjected to a pressure that exceeds a threshold pressure
Data Source
AI summary
An example road sensor apparatus comprises: a sensor casing comprising a first surface for interfacing environmental conditions on a surface of a pavement, a second surface for interfacing a sensor level adjustment element, and a sensor portion including one or more sensor apparatuses; the sensor level adjustment element comprising plastic material that exhibits permanent compression in response to being subjected to a pressure that exceeds a threshold pressure and having a first surface for interfacing the sensor casing and a second surface for interfacing a bottom of a recess in the pavement; and an installation sleeve, the sensor casing and the sensor level adjustment element arranged adjacent to each other and at least the sensor casing arranged within the installation sleeve such that the sensor casing is moveable with respect to the installation sleeve in response to a pressure that exceeds said threshold pressure being applied on its first surface.