Amorphous Quartz Pressure Transducer Eliminates Hysteresis
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Solution Overview
Problem
Bourdon tubes made of metal materials exhibit hysteresis due to retained deformations and adhesive materials, leading to measurement errors in pressure transducers.
Innovation Solution
A pressure transducer comprising a flexible amorphous quartz Bourdon tube mechanism and a crystalline quartz sensor coupled without adhesive materials, using molecular bonding techniques such as heat, water, solvents, or additives like salt to reduce hysteresis and improve accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal Bourdon tubes are used, then the structure is strong and durable, but hysteresis occurs due to retained deformations and adhesive materials causing measurement errors
Solution Approach 1:
The patent changes the material parameter from metal to amorphous quartz, fundamentally altering the physical and chemical properties of the Bourdon tube. This material substitution eliminates hysteresis effects while maintaining the necessary mechanical flexibility for pressure sensing applications
Solution Approach 2:
The patent removes adhesive materials from the coupling process by implementing direct molecular bonding between amorphous quartz components. This extraction of the adhesive layer eliminates the source of hysteresis that would otherwise be introduced by bonding materials
2Ease of manufacture
If adhesive materials are used to bond components, then assembly is simplified, but hysteresis is introduced affecting true measurement
Solution Approach 1:
The patent removes adhesive materials from the coupling process by implementing direct molecular bonding between amorphous quartz components. This extraction of the adhesive layer eliminates the source of hysteresis that would otherwise be introduced by bonding materials
Solution Approach 2:
The patent replaces mechanical/adhesive bonding systems with molecular-level bonding between amorphous quartz surfaces. This substitution eliminates the need for adhesive materials while maintaining strong structural integrity through direct molecular connections
3Measurement precision
If crystalline quartz sensor is coupled without adhesive, then hysteresis is minimized, but molecular bonding requires specialized techniques
Solution Approach 1:
The patent changes the bonding interface parameters by using amorphous quartz surfaces that can form direct molecular bonds with crystalline quartz sensors. This material parameter change enables adhesive-free coupling while maintaining manufacturing feasibility through controlled bonding processes
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
The solution minimizes hysteresis and enhances measurement precision by maintaining the crystalline sensor in tension over the entire operating range, providing linear pressure translation and reducing errors caused by thermal changes.
Implementation Method 1
the amorphous quartz of the flexible member and the crystalline quartz sensor are coupled together at the molecular level
Implementation Method 2
The bonding may be encouraged by the application of one or more of heat, water, solvents, and additives
Implementation Method 3
The frequency at which the resonant sensor resonates due to the force is indicative of the pressure in the tube
Implementation Method 4
Bourdon tubes are tubes that flex radially, by coiling and uncoiling, in response to pressure changes between the tube and its surrounding environment
Data Source
Figure 1A
Figure 1B~1C
Figure 2
AI summary
A pressure transducer comprising a flexible member made of amorphous quartz and a crystalline quartz sensor are coupled together without an adhesive material. Instead, the amorphous quartz and the crystalline quartz sensor are coupled together at the molecular level. In some embodiments, the crystalline quartz sensor remains in compression or tension during the entire operating range of the pressure transducer. In one embodiment, the crystalline quartz sensor is pre-stressed in either compression or tension when the pressure transducer is exposed to atmospheric pressure. In one embodiment, pressure transducer is located in pressure stabilizing system.