Fluorescence Intensity Ratio Temperature Sensor for High-Voltage Transformers
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Solution Overview
Problem
Existing temperature measurement technologies for high-voltage transformers face challenges in accurately and directly measuring hot spots due to insulation issues, leading to inaccurate or slow measurement processes, and are prone to electromagnetic interference and noise, especially when using fluorescence lifetime methods.
Innovation Solution
A temperature measurement method utilizing the intensity ratio of fluorescence signals from rare earth ions, such as Nd3+, which are excited by pump light, allowing for direct measurement of hot spots with reduced noise and improved accuracy through the use of optical fiber guides and specific wavelength selection to avoid interference with pump light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fluorescence lifetime method is used for temperature measurement, then temperature measurement capability is achieved, but measurement precision deteriorates due to noise and electromagnetic interference
Solution Approach 1:
The patent replaces the fluorescence lifetime measurement method with a fluorescence intensity ratio method. Instead of measuring the decay time of fluorescence (which is susceptible to noise and electromagnetic interference), the invention measures the ratio of intensities between two fluorescence emission bands. This substitution of measurement principle eliminates the harmful effects of noise and electromagnetic interference while maintaining temperature measurement capability.
Solution Approach 2:
The patent changes the measurement parameter from fluorescence lifetime to fluorescence intensity ratio. By selecting two specific emission bands (first and second fluorescence emission bands) and measuring their intensity ratio, the system achieves temperature-dependent measurement that is immune to noise and electromagnetic interference. The intensity ratio changes with temperature according to the Boltzmann distribution, providing accurate temperature readings without the harmful effects affecting traditional methods.
2Reliability
If indirect temperature calculation method is used for high-voltage transformers, then insulation problem is avoided, but measurement accuracy deteriorates
Solution Approach 1:
The patent uses optical fiber as an intermediary to transmit light signals to and from the high-voltage transformer winding. The optical fiber probe is inserted into the winding, and since optical fibers are electrically insulating, they maintain insulation reliability while allowing direct measurement. The fluorescence emission from the optical material in the winding is transmitted through the optical fiber to the detector, enabling direct temperature measurement without compromising insulation.
Solution Approach 2:
The patent replaces electrical or mechanical temperature sensing methods with optical measurement. Instead of using electrical sensors that would compromise insulation or mechanical sensors that cannot access the hot spot directly, the invention uses fluorescence emission from an optical material excited by pump light. This optical method allows direct measurement of winding temperature while maintaining electrical insulation through the use of optical fibers and non-conductive optical materials.
3Measurement precision
If optical temperature sensor probe is mounted on high-temperature hot spot region, then direct temperature measurement is achieved, but device complexity increases
Solution Approach 1:
The patent makes the optical fiber serve multiple functions: it acts as both the light delivery mechanism for exciting the fluorescence and the light collection path for detecting the emission. The same optical fiber that delivers pump light to excite the optical material also collects the fluorescence emission and transmits it to the detector. This multi-functionality reduces device complexity by eliminating the need for separate illumination and detection optical paths.
Solution Approach 2:
The optical material within the optical fiber probe generates its own fluorescence signal that serves as the measurement indicator. The pump light excites the optical material, and the resulting fluorescence emission directly provides temperature information. The system uses the inherent properties of the optical material (fluorescence emission with temperature-dependent intensity ratio) to perform the measurement, eliminating the need for complex external sensing mechanisms.
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 enables precise, direct temperature measurement at hot spots with reduced electromagnetic interference and noise, improving accuracy and stability, and is applicable to high-voltage systems, reducing system complexity and cost while enhancing sensitivity and efficiency.
Implementation Method 1
A temperature measurement method utilizing the intensity ratio of fluorescence signals from rare earth ions, such as Nd3+, which are excited by pump light
Implementation Method 2
the relative intensity of the fluorescence signal generated at the thermally coupled energy level follows the Boltzmann distribution to have temperature dependence
Implementation Method 3
through the use of optical fiber guides
Data Source
AI summary
Disclosed are a temperature measurement method using the fluorescence characteristic of an optical material having temperature dependence and a temperature sensor technology using the same. According to the present disclosure, the temperature measurement technology using the fluorescence signal intensity ratio has a self-compensation function to reduce optical signal noise caused by fluctuations in light source output and optical waveguide loss, and uses two fluorescence signals with a strong fluorescence signal intensity to solve the existing disadvantage of generating a lot of noise due to a low fluorescence signal.