- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Fabrication of visual textile temperature indicators based on reversible thermochromic fibers
摘要： Human body signals detection functions in fibers such as visual temperature indicator, are important aspects in future development of satisfying the warmth and comfortableness of conventional textile fibers. A series of reversible thermochromic fibers (VTFs), where thermochromic microcapsules and polypropylene (PP) was used as color indicator and polymer fiber matrix, respectively, were prepared via melt spinning in this paper. The temperature-color response behaviors of VTFs were investigated in detail. The scanning electron microscopy (SEM) images of cross section of VTFs showed that PP was an excellent matrix for the dispersion of thermochromic microcapsules and no aggregation occurred. The results of color measuring and matching indicated that VTFs exhibited various colors of red, purple and blue depending on the mass ratio of the red function and blue function microcapsules. Moreover, when the ambient temperature changed between 5 °C and 35 °C, the color of VTFs could fade and recover in a short time, and this kind of VTFs displayed excellent performance stability after 60 temperature cycles.
关键词： Temperature indicator,Polypropylene,Cycling stability,Reversible thermochromic fibers
更新于2025-09-04 15:30:14
-
Tests and Foreseen Developments of Fibered-OSLD Gamma-Heating Measurements in Low-Power Reactors
摘要： In this paper, test measurements of a fibered optically stimulated luminescent dosimeter (OSLD) system performed during a dedicated experimental phase in EOLE zero-power reactor are presented. The measurement setup consists of an OSLD crystal connected onto the extremity of an optical fiber and a laser stimulation system, manufactured by the CEA/LIST, Saclay, France. The OSL sensor is remotely stimulated via an optical fiber using a diode-pumped solid-state laser. The OSL light is collected and guided back along the same fiber to a photomultiplier tube through appropriate optical filters. OSL signals are corrected for background noise and integrated to provide the absorbed doses thanks to calibration coefficients. The light stimulation also fully bleaches the crystal (reusable for the next measurement). Results obtained using this system are compared to usual gamma-heating measurement protocol using OSLD pellets. Both measurement processes were calibrated to ensure the comparison of absolute doses in gray at the same positions in the core. The presence of induced radioluminescence in the OSLD during the irradiation was also observed and could be used to monitor the gamma flux. The feasibility of remote measurements is achieved, whereas further developments could be conducted to improve this technique since the readout procedure still requires to withdraw the OSLD off the gamma flux (hence from the core) on account of the dose rate (around a few Gy·h?1), and the readout time remains quite long for online applications. Several improvements are foreseen and will be tested in the forthcoming years.
关键词： optically stimulated luminescent dosimeters (OSLD),optical fibers,Nuclear heating,remote readout
更新于2025-09-04 15:30:14
-
Characterization of distributed Brillouin sensors based on elliptical-core two-mode fiber
摘要： Distributed Brillouin sensors based on the intra- and intermodal stimulated Brillouin scattering (SBS) of the LP01 and LP11 guided modes in an elliptical-core two-mode fiber (e-core TMF) are investigated and characterized. The strain and temperature dependence of the Brillouin frequency (νB) for each intra- and intermodal SBS is measured, and the feasibility of distributed sensors based on the e-core TMF is tested. As an application of intermodal SBS Brillouin optical time-domain analysis (BOTDA) with an LP01 mode probe and LP11 mode pump waves is demonstrated which can simultaneously measure the distribution of νB and the propagation loss of the LP11 mode. The strain and temperature coefficients of the double-peak Brillouin gain spectrum (BGS) observed in the intramodal SBS of the LP11 mode are separately measured for each peak by applying Brillouin optical correlation domain analysis (BOCDA) with a differential measurement scheme. Experimental results show that e-core TMF can be used as a robust platform for distributed Brillouin sensors with strain and temperature coefficients of νB in the intra- and intermodal SBS very close to each other, with a discrepancy less than 1%.
关键词： Brillouin scattering,few-mode,optical fibers
更新于2025-09-04 15:30:14
-
A Study on Photocatalytic Behaviors of Activated Carbon Fibers Impregnated with N-Doped Titania
摘要： Activated carbon ?bers (ACFs) impregnated with N-doped titania were prepared via the sol–gel method and sonochemical synthesis. The photocatalytic behavior of rhodamine B showed that N-doped TiO2/ACF nanocomposites exhibited enhanced photocatalytic activity. This result could be attributed to the synergistic effect between the high adsorption capacity of ACF and the visible light photocatalytic activity of N-doped TiO2. In particular, the N-doped TiO2/ACF nanocomposite that was sonicated four times had the highest photocatalytic ef?ciency and degradation rate, owing to the optimal N-doped TiO2 loading and nanocomposite pore structure.
关键词： N-doped TiO2,Sonochemical Synthesis,Activated Carbon Fibers,Photodegradation
更新于2025-09-04 15:30:14
-
MDL reduction effect of S-bend induced modal coupling in five-mode ring core fiber
摘要： We discuss the extensibility of the S bend model to five mode ring core fiber (RCF). We propose a MUX/DEMUX for the five mode RCF and clarify design conditions from the viewpoint of connectivity. We evaluate the in-bobbin state with different barrel sizes and confirm the extensibility of the S bend model to five mode transmission. Furthermore, a transmission experiment demonstrates the reduction in MDL possible by promoting binding in five-mode RCF.
关键词： Ring-core fiber,Few-mode fibers,Difference of the effective index
更新于2025-09-04 15:30:14
-
Nanoapertures without nanolithography
摘要： We propose and experimentally demonstrate the implementation of lithography-free nano-apertures on optical fibers. By sputtering metallic nanofilms onto the end face of step index fibers that contain central nano-channels, fiber-integrated nano-apertures are instantaneously implemented without the use of any kind of lithographic step. In accordance with simulations, the experiments show diffraction-limited nano-spots in the far-field at the location of the nano-aperture for sufficiently thick films. We reproducibly implement a series of devices by sputtering Al and Pt nano-films, reaching aperture diameters as small as 40 nm and showing spectrally broadband operation. Due to its simplicity, scalability and potential for large-scale production the nano-aperture enhanced fiber concept will be highly relevant for lab-on-a-fiber applications and for the development of future fiber-based nano-probes with high spatial resolutions.
关键词： lab-on-a-fiber,hybrid fibers,nanofabrication,scanning near-field optical microscopy (SNOM),nanoapertures
更新于2025-09-04 15:30:14
-
Effectiveness of Glaucoma Diagnostic Parameters from Spectral Domain-Optical Coherence Tomography of Myopic Patients
摘要： 目的：目前频域光学相干成像（SD?OCT）可作为青光眼诊断的新工具。因此本文评价了SD?OCT所提供的青光眼诊断参数在不同屈光度近视患者中的诊断能力。 方法：横断面研究。共有248例受试者（248眼）入选。包括早期开角型青光眼组51，正常人组79例（±0.50D之内），低度近视组47例（?0.50 D to ?3.00 D（不包括）），中度近视组43例（?3.00 D to ?6.00 D（不包括）），高度近视组28例（≤?6.00 D）。所有受试者均行眼科常规检查及Humphrey 视野计、SD?OCT检查，将OCT检查所获得的视网膜神经纤维层(RNFL)和节细胞复合体（GCC））的相关参数进行统计学分析，分别绘制受试者操作曲线（ROC）并计算曲线下面积（AUC）。 结果：AUC结果如下：正常人、低度近视眼组的AUC最佳参数均为下方、颞下方RNFL厚度（AUC均﹥0.94），而中度近视、高度近视组的最佳参数均为颞下方参数（AUC分别为0.926，0.896），而中度近视组下方参数的AUC较小（0.864）排在所有RNFL参数的第15位。对文献中公认的诊断青光眼能力强的参数（下方、颞下方、颞上方）进行进一步分析，当灵敏度为85%时，这些参数在正视眼、低度近视眼组的特异度较高，均大于80%，而在中度近视、高度近视组特异度均较低，约在20%～60%。根据机器数据库所得绿色部分在高度近视组也较其他组少（P < 0.05）。 结论：SD?OCT的青光眼诊断参数在应用于中高度近视眼时的诊断能力较弱，特异度明显偏低，对中高度近视者进行青光眼的诊断时需综合分析。同时建议SD?OCT的正常人数据库应针对不同屈光度进行补充完善。
关键词： Glaucoma,Retina,Myopia,Nerve Fibers,Open Angle
更新于2025-09-04 15:30:14