Pressure Sensor Baffle Design for Resonance Mitigation
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Solution Overview
Problem
Pressure sensors fail to accurately measure fluid pressure in harsh environments with high-frequency pressure ripples due to resonance amplification and non-linear responses, leading to erroneous outputs and potential failure.
Innovation Solution
The pressure sensor design includes a housing with an isolator and cavities, a channel positioned at a null point of the primary resonance mode, and a baffle arrangement to prevent fluid jetting, which adjusts resonance frequencies and prevents fluid from directly impacting the isolator, ensuring accurate measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the pressure sensor operates in harsh environments with high frequency pressure ripples, then the sensor can measure pressure in challenging conditions, but resonance amplification occurs and measurement accuracy deteriorates
Solution Approach 1:
A baffle arrangement is introduced as an intermediary component between the fluid source and the isolator. This baffle prevents direct fluid jetting onto the isolator, thereby eliminating the harmful resonance amplification effect while allowing the sensor to continue operating in harsh environments with high frequency pressure ripples
2Measurement precision
If the channel is positioned at the null point of the primary resonance mode, then resonance amplification is mitigated, but the device complexity increases
Solution Approach 1:
The channel positioning parameter is specifically adjusted to align with the null point of the isolator's primary resonance mode. This parameter change exploits the natural resonance characteristics of the isolator to mitigate resonance amplification without requiring additional active control systems or complex mechanisms
3Device complexity
If fluid jets directly onto the isolator, then the pressure transmission is direct and simple, but rectification errors occur and measurement accuracy deteriorates
Solution Approach 1:
The baffle arrangement converts the harmful direct fluid jetting into a beneficial dispersed flow pattern. By blocking direct jetting, the baffle transforms the potentially harmful concentrated pressure into distributed pressure waves that do not excite resonance, thereby eliminating rectification errors while maintaining structural simplicity
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 design effectively mitigates resonance amplification and rectification errors, maintaining sensor linearity and preventing failures by aligning the channel with the null point of the isolator's primary resonance mode and using a baffle arrangement to break up pressure waves, thus ensuring accurate pressure measurement.
Implementation Method 1
If the pressure ripple frequency coincides with resonant frequencies of the pressure sensor, it is possible that the amplitude of the pressure ripple will be amplified
Implementation Method 2
The acoustic resonances of fluids, Helmholtz resonances, and mechanical resonances of components in the pressure sensors and mountings for the pressure sensors need to be accounted for
Implementation Method 3
The acoustic resonances of fluids, Helmholtz resonances, and mechanical resonances of components in the pressure sensors and mountings for the pressure sensors need to be accounted for
Implementation Method 4
one or more piezoresistive strain gauge sensors on the diaphragms can measure the strain in the diaphragms caused by the deformation of the diaphragms
Implementation Method 5
a pressure sensor can have one or more diaphragms that deform based on the pressure of a first fluid and/or a second fluid
Implementation Method 6
which can result in cavitation
Data Source
AI summary
A pressure sensor includes a housing, an isolator positioned at a first end of the housing, and a first cavity formed between the first end of the housing and the isolator. The pressure sensor further includes a second cavity formed in the housing and a channel with a first end fluidly connected to the first cavity and a second end fluidly coupled to the second cavity. A pressure sensor chip is positioned in the second cavity and includes a first diaphragm positioned at a top side of the pressure sensor chip laterally outwards from the second end of the channel to prevent a fluid from jetting onto the first diaphragm.