Particulate Matter Sensor Cover for Dust Ingress Control
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Solution Overview
Problem
Information handling systems face challenges in efficiently managing and controlling dust ingress, particularly with particulate matter sensors, which consume significant power and resources, leading to undue burdens on system resources and potential performance degradation due to dust buildup.
Innovation Solution
Incorporating a fan system with a sensor device that uses a wax motor to control airflow through a particulate matter sensor, allowing for dynamic adjustment of sampling frequencies and power consumption based on ambient conditions, thereby optimizing resource usage and detecting dust levels for proactive maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the particulate matter sensor continuously samples air to detect dust levels, then the detection capability is improved, but the power consumption and processing load increase significantly
Solution Approach 1:
The system implements periodic sampling of air by the particulate matter sensor instead of continuous sampling. The cover alternates between covering and uncovering the sensor inlet at set intervals, allowing the sensor to take measurements at specific times while remaining protected at other times, thereby reducing power consumption and processing load while maintaining adequate dust level detection capability
Solution Approach 2:
The cover is positioned to cover the sensor inlet before dust ingress becomes a problem. By proactively protecting the sensor with the cover in the closed position during periods when sampling is not required, the system prevents dust accumulation that would otherwise degrade sensor performance, eliminating the need for continuous monitoring
2Measurement precision
If the sensor inlet remains uncovered to allow air flow for sampling, then the measurement accuracy is improved, but dust ingress increases causing performance degradation
Solution Approach 1:
The system periodically opens the cover to allow air flow through the sensor inlet for sampling, then closes it to prevent dust ingress. This periodic opening and closing creates controlled opportunities for measurement while protecting the sensor from harmful dust accumulation during non-sampling periods
Solution Approach 2:
The movable cover is designed to completely block the sensor inlet when closed, effectively extracting or removing the harmful dust particles from the air path before they can reach and accumulate on the sensor, while still allowing unobstructed air flow when opened for sampling
3Temperature
If the fan runs continuously to cool components, then the thermal management is improved, but the dust ingress into the sensor and system increases
Solution Approach 1:
The cover acts as a barrier that extracts or removes dust particles from the air stream before they can enter the sensor inlet, allowing the fan to run continuously for cooling while preventing dust ingress during periods when sampling is not occurring
Solution Approach 2:
The movable cover serves as an intermediary element between the fan-driven air flow and the sensor inlet. It mediates by blocking the inlet during non-sampling periods, preventing dust-carrying air from reaching the sensor while allowing the fan to continue its cooling function
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 effectively reduces power consumption and processing loads while enabling proactive monitoring and maintenance, ensuring the longevity and reliability of information handling systems by minimizing dust-related performance impacts.
Implementation Method 1
The sensor device may include a movable cover and a wax motor coupled to the movable cover. The wax motor may be configured to change positions of the movable cover in response to changes in temperature
Data Source
AI summary
An information handling system includes a fan to cool a component of the information handling system, and a sensor device. The fan includes a first fan inlet, a second fan inlet, and a fan outlet. The fan is configured to draw air into the first and second fan inlets and to blow air out the fan outlet. The sensor device includes a sensor inlet, a sensor outlet, and a cover. The sensor is coupled to the fan with the first fan inlet collocated with the sensor outlet such that air drawn into the first fan inlet is first drawn through the sensor inlet. The cover is configured in a first position to cover the sensor inlet to permit no air flow through the sensor inlet and in a second position to uncover the sensor inlet to permit air to flow through the sensor inlet.