Fiber Bragg Grating Transducer for Simultaneous Pressure and Temperature Measurement
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Solution Overview
Problem
Current fluid flow measurement devices are unable to simultaneously measure temperature and pressure effectively, limiting the accuracy and reliability of fluid flow measurements.
Innovation Solution
The use of an optical fiber with two fiber Bragg gratings positioned within a tube, where the gratings undergo geometric changes in response to fluid pressure and temperature, allowing for the simultaneous measurement of pressure and temperature through wavelength shift analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional flow meters are used, then velocity or pressure measurement can be achieved, but simultaneous temperature and pressure measurement is not possible
Solution Approach 1:
The patent combines multiple measurement functions (temperature and pressure) into a single optical fiber sensor system. Two fiber Bragg gratings are integrated onto one optical fiber, allowing simultaneous measurement of both parameters through a unified device rather than separate sensors.
Solution Approach 2:
The optical fiber sensor system performs multiple functions simultaneously - it measures both temperature and pressure of the fluid flow using the same physical medium (optical fiber) and detection mechanism (wavelength shift analysis), making the device universal for multi-parameter monitoring.
2Adaptability or versatility
If optical fiber with fiber Bragg gratings is used, then simultaneous temperature and pressure measurement is enabled, but device complexity increases
Solution Approach 1:
The patent replaces traditional mechanical pressure sensors and temperature sensors with an optical-based system. The fiber Bragg gratings use optical wavelength shifts to detect both pressure and temperature, eliminating the need for separate mechanical sensing components and reducing overall system complexity despite the advanced optical technology.
Solution Approach 2:
The system utilizes changes in optical parameters (wavelength, intensity) of the fiber Bragg gratings in response to physical parameters (pressure, temperature). By monitoring wavelength shifts of the reflected light, the system translates mechanical and thermal effects into measurable optical signals, enabling simultaneous measurement through parameter transformation.
3Measurement precision
If wavelength shift analysis is used for pressure and temperature determination, then measurement accuracy improves, but difficulty of detecting and measuring increases
Solution Approach 1:
The fiber Bragg gratings act as intermediaries that directly interact with the fluid's pressure and temperature fields. The gratings translate these physical conditions into wavelength shifts of reflected light, providing a direct measurement mechanism that simplifies detection compared to indirect methods, while maintaining high precision through optical wavelength analysis.
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 method provides a more accurate, reliable, and sensitive fluid flow measurement by determining pressure through wavelength shift differences and calculating temperature from these shifts, enhancing the precision of fluid flow assessments.
Implementation Method 1
the gratings undergo geometric changes in response to fluid pressure and temperature, allowing for the simultaneous measurement of pressure and temperature through wavelength shift analysis
Implementation Method 2
When the apparatus is in use, the gratings are subject to geometric property changes. These geometric property changes take the form of alterations in tension and compression of the gratings. The wavelength, as measured from the apparatus to a detector, changes in response to the geometric property change.
Data Source
AI summary
The present invention relates a fiber optic transducer (FOT) and methods for measuring the pressure and temperature of a flowing fluid using such FOT, wherein such FOT contains a fiber optic having fiber Bragg gratings. The fiber Bragg gratings are measured during a flowing fluid to determine the difference in the change in wavelength exhibited by a reflected optical signal from the gratings.