Mechanochromic light control technology that can dynamically regulate solar irradiation is recognized as one of the leading candidates for energy-saving windows. However, lack spectrally selective modulation ability still hinders its application different scenarios or individual needs. Here, inspired by generation structure color and change living organisms, a simple layer-by-layer assembly approach toward large-area fabricating mechanically responsive film visible near-infrared...

Aiming at the requirements of miniaturization and integration aviation test equipment problems complex logic limited transmission rate commonly used 1553B bus interface, we propose a design scheme high-speed communication card based on MiniVPX architecture, which adopts LHB155304 as protocol processing unit with one-way dual-redundant channel, is up to 4 Mbit/s. XC7A200T FPGA main controller communicate LHB155304, realizes data interaction through PCIE CPU in equipment. This paper introduces...

Abstract Radiative cooling has emerged as a promising technique for reducing energy consumption in building thermal management due to its passive property and no external requirement. Despite significant advances, scalable production of artificial photonic radiators with periodic structures, environmental stability, high radiative performance, economic applicability is still challenging most state‐of‐the‐art coolers. Rational structure materials design are essential promote daytime sunlight...

High sensitivity and spatial recognition of pressure sensors are important for application the in electronic skins, situ visualization is a practical effective approach to identifying information. Here, we present facial strategy achieve information that visible naked eye coloring form by designing an H3PO4/PVA film with hemispheric microstructures integrated electrochromic sensor. The device can be applied different stress scenarios within range 0-250 kPa adjusting spacing identify...

The objective of this study is to analyze the compressibility effects multiphase cavitating flow during water-entry process. For purpose, a projectile at transonic speed investigated computationally. A temperature-adjusted Tait equation used describe in water, and air vapor are treated as ideal gases. First, computational methodology validated by comparing simulation results with experimental measurements drag coefficient theoretical cavity shape. Second, based on methodology, hydrodynamic...

A micro-fiber-optic acoustic sensor based on the high-quality-factor (high-Q) resonance effect that uses a Fabry-Pérot etalon (FPE) is presented in this study. The device has been demonstrated experimentally to be high-sensitivity with large dynamic range over wide frequency band. Optical contact technology was used improve robustness of FPE, which consists two parallel lenses high reflectivity exceeding 99%. An signal detection system phase modulation spectrum also constructed. stable and...

Strong scattering random media can localize light and extend photon lifetime through multiple scattering, which offers opportunities for stabilizing lasers. Here, we demonstrate a frequency stabilized Brillouin laser with high coherence enabled by localization in fiber grating array (RFGA). Photon trapping is realized due to wave interference multi-scattering Fabry-Pérot (FP) cavities between gratings enabling prolong lifetime. The formation of the finesse peaks RFGA suppresses...

Bound states in the continuum (BICs) have been widely observed many symmetric geometries optical system during last decade. Here, we consider a scenario which structure is designed asymmetrically with anisotropic birefringent material embedded one-dimensional photonic crystals. This kind of new shape opens possibility obtaining symmetry-protected BICs (SP-BICs) and Friedrich–Wintgen (FW-BICs) form tunable anisotropy axis tilt. Interestingly, these can be as high-Q resonances by variation...

Laser surgery provides clean, fast and accurate cutting of tissue. However, it is difficult to detect what kind tissue being cut. Therefore, a wrong cut may lead iatrogenic damage structures. A feedback system should automatically stop the process when nerve reached or accidentally prevent its damage. This could increase applicability safety using laser scalpel in surgical procedures. In this study, random lasing (RL) used differentiate between skin, fat, muscle Among these types, special...

We present an innovative spectroscopic method based on coherent optical frequency-modulated continuous-wave (FMCW) interferometry that can realize multi-point gas detection with high spatial resolution, sensitivity, and selectivity. This takes full advantage of the intrinsic capability localization FMCW, meanwhile efficiently decodes spectral information from reflected signals. Gas sensors are deployed by adopting bus topology, i.e., distributed along a single backbone fiber in measurement...

The distributed high temperature measurement of an optical fiber subjected to electric arc discharges based on frequency-domain reflectometry is experimentally demonstrated. profile attained in open glow regime a few milliamps with maximum detectable up 2100 ± 20 °C. discharge arc-induced softened length the and mechanical stress are measured statistically analyzed terms correlation Rayleigh spectra. large wavelength scanning range OFDR enables much higher accuracy for delay time minimum 40...

The distributed temperature profile of hydrogen flame based on optical frequency-domain reflectometry (OFDR) was experimentally demonstrated for the first time. Spatial field at different flow rate H2 monitored by OFDR via a telecom fiber (Corning SMF-28, CPC6) inside over seconds, and highest is sides center separated ∼1.4mm with difference 140∼190°C dimension 2.5 mm above 900°C. Uniformity level studied varying distance between tube entrance, largest uniform region 1-millimeter length...

We present a novel method based on optical frequency-modulated continuous-wave interferometry that can realize simultaneous measurement of gas absorption spectra and path lengths (OPLs) in the widely used multipass cells (MPCs). This involves Fourier transform (FT) an inverse FT, by which spectrum OPL are retrieved frequency time domains, respectively. Various OPLs achieved retrieving associated with different reflection positions MPC. As demonstration, acetylene around 1520 nm measured...

Distributed optical fiber strain sensing significantly increases the number of points compared with Bragg grating sensor, which makes it an excellent candidate for shape sensing. Theoretical analysis indicates that spatial resolution measurement is crucial to performance sensing, so a sensor based on differential pulse-width-pair Brillouin time-domain proposed improve and performance. The attached both sides steel strip substrate, enables frequency shifts (BFSs) suppress temperature...

The monitoring of acoustic waves is essential for a variety applications, ranging from photoacoustic imaging to industrial non-destructive evaluation and monitoring. Optical sensors have many advantages over electrical counterparts such as passivity immunity electromagnetic interference, can be quite compact with all-fiber structures. A common approach optically detect the acoustically induced mechanical movement cantilever or reflective membrane. However, based on moving parts limitations,...

A multicolor tunable fiber is realized by synergistically controlling the electroluminescence and thermochromic process.

We demonstrate a self-injection locking (SIL) in an Er-doped random fiber laser by high quality factor (high-Q) grating ring (RFGR) resonator, which enables single-mode narrow-linewidth lasing with ultra-low intensity and frequency noise. The RFGR resonator includes to provide feedback modes noise suppression filters self-adjusted peak adaptable small perturbations allowing single longitudinal mode over 7000 s jitter below 3.0 kHz. Single-mode operation is accomplished carefully controlling...

The performance of solar cells and photodetectors based on metal oxide/conjugated polymer hybrids was significantly enhanced by embedding fullerene (C60) in the oxide TiO2. With TiO2–C60 bulk composites as electron extraction layers, poly(3-hexylthiophene) (P3HT)/TiO2–C60 exhibited highest detectivity 6.54 × 1012 jones at 520 nm a fast response with shortest rise time 32 us. key role C60 TiO2 layer is causing transfer from defect state excitons to C60, resulting suppression recombination...

Frequency fluctuation is a major problem in high-precision metrology as real-time optical frequency measurement not available with commercial photodetectors; alternatively, frequency-stabilized lasers reference are also accessible most laboratories. In this study, we propose and demonstrate polarization-maintaining random fiber grating ring (PM-RFGR) resonator PM Brillouin laser (BRFL) to achieve sub-MHz drift, which measured by the beat of pump laser. Experimental results show that...

Research Article| December 08 2016 Leakage control of multi-source water distribution system by network partition and optimal pump schedule in China Jinliang Gao; Gao Search for other works this author on: This Site PubMed Google Scholar Shihua Qi; Qi Jun Nan; Nan Chen Journal Water Supply: Technology-Aqua (2017) 66 (1): 62–74. https://doi.org/10.2166/aqua.2016.034 Article history Received: May 11 Accepted: October Views Icon contents Figures & tables Video Audio Supplementary Data Share...

Random fiber gratings (RFGs) have shown great potential applications in sensing and random lasers. However, a quantitative relationship between the degree of randomness RFG its spectral response has never been analyzed. In this paper, two RFGs with different degrees are first characterized experimentally by optical frequency domain reflectometry (OFDR). Experimental results show that high leads to low backscattering strength grating strong fluctuations spatial domain. The local exhibits...