| Autor: |
LI Qiankun, GUI Lin, DING Meiqi, QAIN Min |
| Zdroj: |
Journal of Shanghai Polytechnic University; Dec2023, Vol. 40 Issue 4, p344-350, 7p |
| Abstrakt: |
The relevant characteristics of the flame sensing system were studied by using the principle that the reflectivity of the fiber end face of microwave photon filter (MPF) changes with the temperature field, resulting in the change of the reflectivity of the fiber end face. The MPF composed of Michelson structured interferometer was used to study the relationship between the changing characteristics and the flame after the microwave photon signal was passed through the 2 km fiber and its fiber end face reflectivity was changed under the influence of the flame. Part of the sensing fiber end face placed in the flame was burned, and the signal amplitude of the light reflection changed because of the flame change. The system used a light source with 16 dBm output power to modulate a microwave signal of 159.63 to 159.80 kHz and 4 V (peak-to-peak value) amplitude on an optical carrier to form a microwave photonic signal. Flame sensing information was obtained by applying external and internal flames to the fiber end face of the sensing arm and measuring the change of radio frequency intensity. The average change of the minimum value of the applied external flame spectrum is 0.460 3 dB. The variation of the average value of the maximum value is 0.578 7 dB, and the variation of the average value of the minimum value of the added internal flame spectrum is 5.818 9 dB, the average variation of the maximum value is 6.600 2 dB. The experiment verifies that the system has good sensing performance for the flame detection. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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