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| 1 | Design and numerical simulation of SPF-PCF-SPF fluid sensing system based on photoelectric oscillator显示文摘In this paper,an optical fiber fluid sensing system based on optoelectronic oscillator(OEO)was proposed and studied numerically.The fluid sensor head is constructed by splicing two sections of side-polished fiber(SPF)to one section of photonic crystal fiber(PCF).Fluid sample can flow continuously through the holes of PCF.The refractive index(RI)change of the fluid sample can lead to the effective RI change of the fiber,resulting in frequency change of microwave signal generated by OEO.By monitoring the oscillation frequency using an electronic spectrum analyzer(ESA),the RI of fluid sample can be measured.Thanks to the fast interrogation speed of ESAs,the measuring speed can be increased significantly compared to traditional optical fiber RI sensing systems using optical spectrometers.The sensing principle of the system was studied.The sensitivity of the proposed system was evaluated by simulation,and an RI sensitivity of-14.20 MHz/RIU can be achieved.The results show that with proper system design,real-time RI measurement with high sensitivity can be achieved.Increasing the length of the PCF while under the premise of the fluid parameters will be the most reasonable way to improve the sensitivity.The proposed design and simulation results can provide suggestions for the fabrication and optimization of fluid sensing systems used for real-time detection and measurement of biological elements and heavy metal ions in liquid environment. | GUO Junqi YUE Yiting CUI Wei ZOU Xinhai YANG Haoyu YANG Junkai | 2022 | Optoelectronics Letters2022，18，6： | 0 |
| 2 | 原料乳冻藏条件对牦牛酸奶贮存品质的影响显示文摘牦牛乳是优质乳源,用其发酵生产的牦牛酸奶,因其营养价值丰富、风味独特而逐渐受到消费者关注。原料乳质量优劣直接影响后续乳制品品质,故本研究考察了牦牛原料乳在不同冻藏方式(-20℃和-40℃)下分别贮存30、90、180 d时对酸奶加工品质的影响。结果显示,与用鲜奶制成的牦牛酸奶相比,用冻藏30 d原料乳制成的酸奶品质未发生显著性变化;当原料乳冻藏至90 d时,-20℃冻藏组的酸奶在贮存期间后酸化现象严重,持水力、表观黏度以及质构特性均显著降低,而-40℃组则仍能保持较好的品质;当原料乳贮存至180 d时,制得的酸奶品质进一步下降。因此,短期贮存时,冻藏温度对牦牛酸奶影响较小,-40℃更有利于牦牛酸奶的长期贮存。 | 石娜娜 窦祎凝 宋从从 | 2023 | 中国食品添加剂2023，34，8： | 0 |
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