Double-Ended Tuning Fork Resonator for High-Temperature Pressure Sensing
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Solution Overview
Problem
Current sensors for measuring downhole properties in wells, such as pressure and temperature, face limitations in high-temperature applications due to materials like α-Quartz, which lose piezoelectric properties above their Curie temperature, and struggle with temperature-induced errors in pressure measurements.
Innovation Solution
The development of a pressure sensor using a double-ended tuning fork resonator in a piezoelectric crystal substrate with a high Curie point material, such as Langasite, combined with a temperature compensation method, allows for accurate pressure measurement across a wide temperature range by integrating a temperature-dependent resonator for calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If α-Quartz piezoelectric material is used in the sensor, then the sensor can operate at moderate temperatures, but it loses piezoelectric properties above the Curie temperature
Solution Approach 1:
The patent changes the material parameter (Curie temperature) by selecting Langasite crystal instead of α-Quartz. Langasite has a Curie temperature above 900°C, which fundamentally changes the operating temperature range and maintains piezoelectric properties at high temperatures where α-Quartz would fail.
Solution Approach 2:
The sensor employs a composite structure combining Langasite piezoelectric crystal with specific electrode materials and protective coatings. This composite approach ensures optimal piezoelectric performance while maintaining stability in high-temperature downhole environments.
2Measurement precision
If temperature compensation is not implemented, then the sensor structure remains simple, but temperature-induced errors significantly affect pressure measurement accuracy
Solution Approach 1:
The patent implements temperature compensation by measuring the actual temperature with a temperature sensor and using this feedback to correct the pressure measurement. The controller adjusts the pressure reading based on the temperature-induced frequency shift, eliminating measurement errors while maintaining a relatively simple overall structure.
Solution Approach 2:
A temperature sensor acts as an intermediary element that measures temperature independently. This intermediary measurement is then used to compensate for temperature effects on the pressure sensor, separating the temperature measurement function from the pressure measurement function.
3Measurement precision
If a temperature-dependent resonator is integrated for calibration, then temperature compensation is achieved, but the device complexity increases
Solution Approach 1:
The patent merges the temperature compensation function with the pressure measurement system by integrating a temperature-dependent resonator into the same device. Both the pressure-sensitive resonator and temperature-dependent resonator share the same piezoelectric substrate and measurement electronics, reducing overall system complexity despite the added functionality.
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 solution enables precise pressure measurement with reduced temperature-induced errors and extended operational range, suitable for high-temperature and high-pressure environments, maintaining sensor accuracy and stability over time.
Implementation Method 1
a sensor with a sensing element that has a double-ended tuning fork piezoelectric resonator
Implementation Method 2
double-ended tuning fork resonator... two tines spaced apart from one another to form a slot between the tines
Data Source
AI summary
Resonating sensors for use in high-pressure and high-temperature environments are provided. In one embodiment, an apparatus includes a sensor with a double-ended tuning fork piezoelectric resonator that includes a first tine and a second tine. These tines are spaced apart from one another so as to form a slot between the first and second tines. The width of the slot from the first tine to the second tine varies along the lengths of the first and second tines. Various other resonators, devices, systems, and methods are also disclosed.