Signal processing method and system for red light excitation fluorescence lifetime demodulation temperature
A technology of exciting fluorescence and signal processing, which is applied in the field of fluorescent optical fiber temperature sensing and detection, can solve the problems of low analysis accuracy and large error, and achieve the effects of improving calculation accuracy, eliminating large error, and improving demodulation accuracy
Active Publication Date: 2021-02-23
西安和其光电科技股份有限公司
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[0005] The invention relates to a signal processing method for temperature demodulation of fluorescence lifetime excited by red light, which overcomes the problems of low analysis accuracy and large error in analyzing the fluorescence lifetime excited by red light by using the traditional method
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[0054] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0055] The signal processing method of the present invention for red light excitation fluorescence demodulation temperature comprises the following steps:
[0056] Step 1: collect the fluorescence lifetime signal excited by continuous red light through the data acquisition card (such as figure 1 shown) and background signal of fluorescence lifetime excited by red light (as figure 2 shown);
[0057] Step 2: By calculating the first derivative of the fluorescence lifetime signal excited by continuous red light, the starting point and the final point of each cycle waveform can be judged (such as image 3 shown); intercepting a single period of red light excitation fluorescence lifetime signal;
[0058] Step 3: Establish a single-period red light-excited fluorescence lifetime signal model:
[0059] I(t)=a×exp(-t / τ)+b+c (1)
[0060] Among them...
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The present invention relates to fluorescent optical fiber temperature sensing and detection technology, and relates to a signal processing method and system for demodulating temperature of fluorescence lifetime excited by red light, which overcomes the problems of low analytical precision and large errors in analyzing the lifetime of fluorescence excited by red light by using traditional methods problems, including collecting data, intercepting single-period red-light-excited fluorescence lifetime signals, establishing red-light-excited fluorescence lifetime signal models, and obtaining red-light-excited fluorescence lifetime signal intensity I that eliminates red-light-excited fluorescence lifetime background signals and DC components m , the process of obtaining the best fitting section, obtaining the fluorescence lifetime and looking up the table, the present invention can reduce the influence of the red light excitation fluorescence lifetime background signal on the fluorescence lifetime and temperature demodulation accuracy, and eliminate the influence of the DC component on the demodulation accuracy impact while reducing the non-exponential impact.
Description
technical field [0001] The invention relates to fluorescent optical fiber temperature sensing and detection technology, in particular to a signal processing method and system for demodulating temperature of fluorescence lifetime excited by red light. Background technique [0002] The basic principle of fluorescence temperature measurement is that within a certain temperature range of fluorescent substances, their fluorescence lifetimes show a certain correlation with temperature, so the temperature can be measured by measuring and calculating the fluorescence lifetimes at different temperatures. According to the principle of electronic transition, when light is irradiated on the fluorescent substance, the electrons inside it gain energy from the ground state to the excited state, and the radiation energy released from the excited state back to the ground state makes the fluorescent substance fluoresce. After the excitation light is removed, The continuous emission time of fl...
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IPC IPC(8): G01K11/32
CPCG01K11/3213
Inventor 张文松周航
Owner 西安和其光电科技股份有限公司