Pressure Sensor Calibration Chamber with Flow Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing calibration devices for pressure sensors are limited in size and cannot effectively calibrate large pressure sensors or those with multiple pressure cells, and they lack the ability to control the rate of pressure variation, which is crucial for accurate calibration in both static and dynamic conditions.
Innovation Solution
A calibrating device comprising a gas-tight calibration chamber with a constant dead volume, a reference pressure sensor, and a gas source with a flow controller to control the pressure increase rate, allowing for precise calibration of large pressure sensors and those with multiple pressure cells, including insoles, by simulating various pressure conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If usual calibration devices are used, then the calibration process is simple, but the device size is limited and cannot accommodate large pressure sensors
Solution Approach 1:
The calibration device is divided into modular components: a calibration chamber, a gas source with flow controller, and a reference pressure sensor. This segmentation allows the device to be designed with flexible dimensions that can accommodate large pressure sensors while maintaining operational simplicity through standardized calibration procedures.
2Adaptability or versatility
If pressure is applied quickly to simulate dynamic conditions, then dynamic calibration is achieved, but the response may differ from static equilibrium conditions
Solution Approach 1:
The calibration device incorporates a flow controller that can adjust the rate of gas injection to simulate different pressure application rates. This allows the system to transition between static equilibrium conditions (slow injection) and dynamic conditions (fast injection), enabling the pressure sensor to be calibrated for both scenarios while maintaining measurement precision through controlled variable rates.
3Volume of moving object
If a large calibration chamber is used to accommodate large pressure sensors, then the sensor can be calibrated, but the dead volume increases and pressure control becomes difficult
Solution Approach 1:
The device replaces mechanical pressure control mechanisms with a gas flow-based system. A flow controller regulates the rate of gas injection into the calibration chamber, and a reference pressure sensor continuously monitors the pressure. This substitution allows for precise pressure control even in large chambers, as the electronic flow control and feedback measurement system provides better precision than mechanical regulators would allow.
4Measurement precision
If multiple pressure cells are calibrated separately, then each cell can be calibrated, but the calibration process becomes complex and time-consuming
Solution Approach 1:
The calibration chamber is designed to accommodate multiple pressure cells simultaneously, allowing them to be calibrated together in a single integrated process. The gas flow system applies pressure uniformly across all cells, and the reference pressure sensor provides a common reference for all measurements. This merging approach maintains the precision of individual cell calibration while significantly reducing the overall complexity and time required compared to separate calibration procedures.
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
Enables the calibration of large pressure sensors and those with multiple cells in a single step, with precise control over pressure variation rates, effectively capturing dynamic and static pressure responses, enhancing the accuracy of pressure sensor calibration.
Implementation Method 1
a gas source comprising a gas tank connected to the calibration chamber through a valve so as to inject a controlled flow of gas into the calibration chamber; wherein the valve comprises a flow controller having an equivalent inner diameter comprised between 2.5 mm and 3.5 mm
Implementation Method 2
a reference pressure sensor configured to measure pressure inside the calibration chamber
Data Source
AI summary
A calibrating device for pressure sensors, allowing for calibration of pressure sensors with a well-controlled increase rate of pressure. The calibrating device includes a calibration chamber configured to allow placing a sample pressure sensor inside, reference pressure sensor to measure pressure inside the calibration chamber, and a gas source. Also, a method for calibration of pressure sensors.