Signal processing method for fluorescence demodulation temperature
A signal processing and fluorescence technology, applied in the field of fluorescence optical fiber temperature sensing and detection, can solve the problems of large fluctuation of fluorescence lifetime demodulation results and low single-exponential fitting accuracy, so as to reduce the influence, eliminate the influence, and reduce the fitting. effect of error
Active Publication Date: 2020-08-07
西安和其光电科技股份有限公司
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[0004] The purpose of the present invention is to solve the problem that the existing fluorescence lifetime attenuation waveform is a weak signal, resulting in large fluctuations in the fluorescence lifetime demodulation results and low accuracy of single-exponential fitting, and to provide a signal processing method for fluorescence demodulation temperature
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[0030] The content of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0031] A signal processing method for fluorescence demodulation temperature, comprising the following steps:
[0032] Step 1: If figure 1 and figure 2 As shown, the continuous fluorescence excitation waveform and fluorescence decay waveform are respectively collected through the AD synchronous data acquisition card;
[0033] Step 2: If image 3 As shown, the fluorescence excitation waveform is E(t). By differentiating the collected fluorescence excitation waveform and judging the rising and falling edges of the fluorescence excitation waveform, the initial point and final point of each cycle of the fluorescence excitation waveform can be obtained;
[0034] e(t n ) = E(t n+1 )-E(t n )
[0035] Among them, n=0,1,2,...;
[0036] Step 3: If Figure 4 As shown, the initial point ○ of the recorded fluorescence excit...
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The invention relates to a signal processing method for fluorescence demodulation temperature, which solves the problems of large fluctuation of a fluorescence lifetime demodulation result and low single exponential fitting accuracy caused by the fact that the existing fluorescence lifetime attenuation waveform is a weak signal, and comprises the following steps of 1, respectively collecting continuous fluorescence excitation waveforms and fluorescence attenuation waveforms, 2, obtaining an initial point and a final point of each fluorescence excitation waveform, 3, obtaining a complete fluorescence attenuation waveform, 4, obtaining a fluorescence attenuation waveform after Gaussian white noise elimination, 5, establishing a double-exponential fluorescence attenuation waveform model, 6, obtaining initial values of afterglow intensities a and b, 7, conducting least square fitting on the double-exponential fluorescence attenuation waveform model, obtaining optimal fitting parameters through calculation, and obtaining the fluorescence lifetime through parameter calculation, and 8, comparing the fluorescence lifetime obtained in the step 7 with an existing fluorescence lifetime tableto obtain a temperature value.
Description
technical field [0001] The invention relates to fluorescent optical fiber temperature sensing and detection technology, in particular to a signal processing method for fluorescent demodulation temperature. 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 the fluorescence lifetimes at different temperatures. According to the principle of atomic transition, when the light is irradiated on the fluorescent substance, the electrons inside it gain energy to go 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 fluorescence depends on the lifetime of the fundamental state. The ...
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IPC IPC(8): G01K11/32
CPCG01K11/3213
Inventor 张文松周航朱香平
Owner 西安和其光电科技股份有限公司