High resolution wide range pressure sensor
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Solution Overview
Problem
Conventional pressure sensors in data centers face challenges such as periodic calibration needs, sensitivity to rapid pressure changes, high costs, and difficulty in accurately measuring very low pressure values, leading to inefficiencies in airflow management and potential overheating or overcooling issues.
Innovation Solution
The development of a solid-state airflow sensor assembly that includes a flow deflector and two thermistor elements, allowing for accurate measurement of airflow direction, pressure, velocity, and temperature, with enhanced resolution and reduced calibration requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional pressure sensors are used in data centers, then they can measure pressure, but they require periodic calibration and are sensitive to rapid pressure changes
Solution Approach 1:
The sensor assembly divides the measurement function into multiple thermistor elements positioned at different locations (first thermistor at first axial position, second thermistor at second axial position). This segmentation allows differential measurement that compensates for rapid pressure changes and reduces the need for calibration.
Solution Approach 2:
A flow deflector is introduced as an intermediary component between the thermistor elements. The flow deflector modifies the airflow pattern to ensure consistent thermal coupling between the thermistors and the passing air, improving measurement reliability and reducing sensitivity to pressure fluctuations.
2Measurement precision
If conventional pressure sensors are used, then they can monitor airflow, but they have high costs and difficulty in accurately measuring very low pressure values
Solution Approach 1:
The patent replaces conventional mechanical pressure sensors with a thermal-based measurement system using thermistor elements. The thermistors measure temperature changes caused by airflow, which are then converted to pressure differentials using Bernoulli's equation. This substitution enables accurate low pressure measurement while reducing cost and improving manufacturability.
Solution Approach 2:
The system changes the measurement parameter from direct mechanical pressure detection to thermal parameter detection. By measuring temperature differences across thermistor elements and applying Bernoulli's principle, the system achieves high precision in measuring very low pressure values that would be difficult for conventional sensors.
3Productivity
If conventional sensors are used for airflow management, then they can detect pressure, but they lead to inefficiencies in airflow management and potential overheating or overcooling issues
Solution Approach 1:
The sensor assembly provides multiple measurement functions simultaneously: it measures airflow direction, pressure differentials, velocity, and temperature with a single device. This multi-functionality improves airflow management efficiency by providing comprehensive data for optimal cooling control, preventing both overheating and overcooling conditions.
Solution Approach 2:
The sensor assembly provides real-time feedback on airflow conditions including direction, pressure, velocity, and temperature. This feedback enables dynamic adjustment of cooling systems to maintain optimal airflow, improving productivity while ensuring measurement precision for accurate control decisions.
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 solid-state sensor assembly provides high accuracy and extended operational periods without frequent calibration, enabling efficient airflow management in data centers by accurately detecting pressure differentials and airflow directions, thus optimizing cooling systems and preventing equipment malfunctions.
Implementation Method 1
the flow deflector can be configured to deflect at least a portion of a flow of a fluid flowing through the first passageway in a first direction around the second sensor but not the first sensor
Implementation Method 2
at least one of the first and second sensors is a thermistor element that has a positive temperature coefficient (PTC)
Implementation Method 3
the sensor can be configured to measure a temperature of the air flowing through the sensor and/or wherein the sensor or any system or method using the sensor can be configured to determine the pressure using at least Bernoulli's equation
Data Source
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AI summary
A solid-state sensor, including an enclosure having a first opening in a first side of the enclosure and a second opening in a second side of the enclosure, a first passageway in fluid communication with the first and second openings, and a solid-state direction sensor positioned within the first passageway. The solid-state direction sensor can include a first sensor (142) positioned at a first axial position, a second sensor (144) positioned at a second axial position, and a flow deflector positioned at a third axial position that is between the first and second axial positions. The flow deflector can extend into the first passageway so as to constrict the first passageway.