Overlapping Pressure Sensor Calibration for Broad-Range Accuracy
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Solution Overview
Problem
Existing pressure sensors have limitations in accurately measuring pressures across a wide range and are often dependent on gas composition, leading to inaccuracies and the need for multiple sensors to cover different measurement ranges.
Innovation Solution
A method for operating a group of pressure sensors, including reading simultaneous measurement signals from two sensors with overlapping ranges, using one sensor's signal as an adjustment point to determine calibration parameters for the other, minimizing gas-type dependence and enhancing accuracy through multiple calibration points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single pressure sensor type is used, then the device complexity is reduced, but the measurement precision is limited to a narrow pressure range
Solution Approach 1:
The pressure measurement system is segmented into multiple sensor types, each optimized for specific pressure ranges. A first pressure sensor (e.g., capacitance diaphragm gauge) handles higher pressures while a second pressure sensor (e.g., Pirani sensor) handles lower pressures, with their measurement ranges overlapping in a transition area. This segmentation allows each sensor to operate in its optimal range, improving overall measurement precision across a broad pressure spectrum.
Solution Approach 2:
The system achieves multi-functionality by combining different pressure sensor types in a single measurement volume, enabling the system to measure across a wide pressure range (from atmospheric to high vacuum) using one integrated setup. The control unit automatically selects and switches between sensors based on the current pressure, providing universal pressure measurement capability.
2Measurement precision
If multiple pressure sensors with overlapping ranges are used, then the measurement precision across a broad range is improved, but the device complexity increases
Solution Approach 1:
The control unit continuously monitors signals from both pressure sensors and uses feedback to determine which sensor provides the more reliable measurement at the current pressure. During the overlap range, the system compares readings from both sensors and switches between them based on which signal is stronger or more reliable, ensuring continuous accurate measurement while managing the complexity of having multiple sensors.
Solution Approach 2:
The system dynamically switches between different pressure sensors based on real-time pressure conditions and signal strength. The control unit adjusts which sensor is actively used for measurement, creating a dynamic measurement system that adapts to changing pressure conditions rather than relying on a static sensor configuration.
3Reliability
If pressure sensors operate in overlap range, then the reliability of pressure measurement is improved through sensor switching, but the difficulty of detecting and measuring increases due to gas-type dependence
Solution Approach 1:
The system changes the operational parameters of different pressure sensors based on the measured pressure range. Since different pressure sensor types have different gas-type dependencies at different pressures, the control unit selects which sensor to use based on pressure conditions, effectively changing the measurement parameters to maintain reliability across varying gas compositions and pressures.
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 method achieves accurate pressure measurement across a broad range with reduced gas-type dependency and enables detection of gas composition changes, improving measurement precision and reliability.
Implementation Method 1
pressure sensors whose measuring principle is based on the deformation of a diaphragm by a pressure difference between the two sides of the diaphragm, such as so-called capacitance diaphragm gauges
Implementation Method 2
So-called heat conduction vacuum gauges determine the pressure via the pressure-dependent heat conduction of a gas, for example, in the case of a Pirani vacuum gauge or Pirani sensor, via the determination of the heat power which is given off by a current-carrying wire to the surrounding gas
Implementation Method 3
Ionization gauges, another type of pressure sensor, indirectly measure the pressure by means of the gas-type-dependent determination of the gas density. By ionizing the gas molecules by means of electrons, the gas density is determined based on the neutralization rate of the ions on a collector electrode
Data Source
AI summary
A method for operating a group of pressure sensors is provided. First and second pressure sensors respectively have first and second pressure measurement ranges, and are arranged to measure the pressure in a common measurement volume, and have measurement ranges that overlap in a range. The method comprises: aa) reading out first and second measurement signals respectively from the first and second pressure sensors substantially simultaneously while the pressure in the common measurement volume is in the overlapping range; bb) stipulating the first measurement signal which has been read out as the adjustment point for the second pressure sensor; cc) determining at least one calibration parameter, in particular a gas-dependent calibration parameter, for the second pressure sensor as a function of the first measurement signal, as a function of the adjustment point for the second pressure sensor, as stipulated in bb), and as a function of the second measurement signal.