Dynamic Pressure Calibration Apparatus for Transducer Frequency Response
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Solution Overview
Problem
Pressure transducer assemblies used for measuring liquid pressures are adversely affected by pressure ripples and pulses, leading to inaccurate measurements, reduced lifespan, and potential damage, especially in systems where ripples are unavoidable.
Innovation Solution
A dynamic pressure calibration apparatus that dynamically pressurizes a liquid in a cavity, simultaneously measuring the frequency response of a test transducer and a reference transducer, determining the normalized frequency response and bulk modulus of the liquid, and using a mechanical filter to attenuate undesirable pressure ripples.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a filter assembly is inserted at the front end of the transducer to attenuate pressure ripples, then measurement accuracy is improved, but device complexity increases and the filter design must be matched to specific application parameters
Solution Approach 1:
The patent introduces a filter assembly as an intermediary component between the liquid pressure source and the transducer. This filter assembly includes a housing with a porous filter element that acts as a mediator to attenuate pressure ripples while allowing steady-state pressure to pass through to the transducer, thereby improving measurement accuracy without requiring complex customization to each application
Solution Approach 2:
The filter assembly design allows for parameter adjustments including filter pore size, housing volume, and connection geometry to optimize performance for different applications. By standardizing the interface while allowing parameter variation within the filter design, the system achieves both improved measurement accuracy and reduced device complexity compared to custom-designed filters for each application
2Device complexity
If pressure ripples are allowed to pass through to the transducer, then device complexity is reduced, but measurement accuracy deteriorates and transducer lifespan is shortened
Solution Approach 1:
The filter assembly serves as a protective cushioning element positioned before the transducer to attenuate harmful pressure ripples and pulses. This beforehand protection prevents the high-frequency pressure variations from reaching the transducer, thereby extending transducer lifespan and improving reliability while maintaining a relatively simple overall device structure
Solution Approach 2:
The filter assembly acts as an intermediary protective layer between the liquid pressure system and the transducer. It selectively attenuates harmful high-frequency pressure ripples while allowing steady-state pressure measurements to pass through, thereby protecting the transducer without requiring complex customization
3Measurement precision
If a custom filter design is created for each specific application, then measurement accuracy is improved, but manufacturing cost and time increase
Solution Approach 1:
The filter assembly is designed as a universal component with standardized interfaces and configurable parameters (filter element type, housing volume, connection geometry) that can be adapted to different applications without requiring complete custom design. This multi-functional design achieves measurement accuracy improvement while maintaining ease of manufacture through modular, reusable components
Solution Approach 2:
Rather than designing completely custom filters for each application, the system allows for parameter changes within the standardized filter assembly design (such as filter pore size, housing volume, and connection dimensions). This approach maintains measurement accuracy for different applications while significantly improving manufacturing ease compared to fully custom designs
Data Source
AI summary
Certain implementations of the disclosed technology may include systems and methods for dynamic pressure testing of transducers in communication with a liquid. A method is provided that can include dynamically pressurizing a liquid in a cavity associated with a housing. While dynamically pressurizing the liquid, the method includes simultaneously measuring: a change in volume of the liquid; a test frequency response, by a test transducer in communication with the liquid; and a reference frequency response, by a reference transducer in communication with the liquid. The method may further determine a normalized frequency response of the test transducer, based at least in part on the test frequency response and the reference frequency response. The method may further provide an indication of the normalized frequency response of the test transducer and an indication of the bulk modulus of the liquid.