Pressure Sensor Temperature Control for Accuracy
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Solution Overview
Problem
Pressure sensors with diaphragm-based detecting devices face issues with corrosion and byproduct deposition, leading to changes in mechanical and thermal characteristics, which affect temperature sensitivity and measurement accuracy, resulting in decreased productivity due to frequent device replacement and adjustment needs.
Innovation Solution
A pressure sensor system that includes a detecting device with a diaphragm, a storage unit for temperature characteristics, a correcting unit to adjust pressure values based on measured temperature, and a temperature control unit to vary the diaphragm's temperature, allowing for in-situ adjustment of temperature characteristics without removing the device from the apparatus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the detecting device is heated to prevent byproduct deposition, then byproduct deposition is reduced, but the temperature characteristic changes and measurement accuracy deteriorates
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the temperature of the detecting device based on the measured pressure value. When the pressure value indicates byproduct deposition is occurring, the temperature is increased to prevent deposition. When normal operation is detected, the temperature is reduced to maintain measurement accuracy. This dynamic parameter adjustment resolves the contradiction between preventing byproduct deposition and maintaining measurement precision.
Solution Approach 2:
The patent implements dynamics by making the temperature control adaptive and responsive to real-time operating conditions. The temperature control unit continuously monitors pressure measurements and adjusts the heating accordingly, transitioning between different temperature states based on the operational context. This dynamic approach allows the system to prevent byproduct deposition only when necessary, thereby maintaining measurement accuracy during normal operation.
2Measurement precision
If the detecting device is removed for adjustment, then temperature characteristic can be corrected, but productivity decreases
Solution Approach 1:
The patent applies self-service by enabling the detecting device to perform its own temperature characteristic correction in-situ without requiring removal from the apparatus. The temperature control unit and pressure measurement unit work together to automatically adjust and verify the temperature characteristics while the device remains installed, eliminating downtime and maintaining productivity while ensuring measurement precision.
Solution Approach 2:
The patent implements continuity of useful action by allowing the pressure sensor to remain continuously operational during temperature characteristic adjustments. The device can perform measurements and simultaneously undergo temperature adjustments without interruption, ensuring continuous productivity while maintaining or correcting measurement accuracy through real-time temperature control.
3Object-affected harmful factors
If the diaphragm temperature is increased to prevent byproduct deposition, then deposition is reduced, but the mechanical characteristics change affecting sensitivity
Solution Approach 1:
The patent applies dynamics by making the temperature adjustment temporary and condition-dependent. The temperature is increased only when byproduct deposition is detected or anticipated, and is reduced when normal operating conditions are restored. This dynamic temperature management prevents permanent changes to the diaphragm's mechanical characteristics and sensitivity, maintaining reliability while preventing deposition when necessary.
Solution Approach 2:
The patent uses parameter changes by temporarily modifying the temperature parameter in response to specific conditions (byproduct deposition risk) and restoring it when conditions normalize. This conditional parameter adjustment prevents irreversible changes to the diaphragm's mechanical properties and sensitivity, ensuring reliability is maintained while still preventing byproduct deposition during critical periods.
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 continuous operation of pressure sensors by adjusting temperature characteristics in real-time, reducing the need for device replacement and maintaining measurement accuracy, thus enhancing productivity.
Implementation Method 1
a diaphragm (112) displaced in response to pressure from an object to be measured
Implementation Method 2
the diaphragm (112) and the base (111) define a capacitance chamber (113)... configured to convert the displacement of the diaphragm into a change in capacitance
Implementation Method 3
a temperature control unit configured to vary the temperature of the detecting device in the predetermined temperature range
Data Source
AI summary
A pressure change measuring unit causes a temperature control unit to operate and vary the temperature of a sensor chip in a predetermined temperature range, and measures changes in pressure value output from the sensor chip whose temperature is being varied. A temperature characteristic calculating unit calculates a temperature characteristic of the sensor chip from changes in the temperature of the sensor chip caused by the operation of the temperature control unit and changes in pressure value measured by the pressure change measuring unit.