Design of High Sensitive Temperature Sensor Based on Two-Dimensional Photonic Crystal

In this effort, a two-dimensional photonic crystal ring resonator (2DPCRR) is simulated. This device is developed for temperature detection in harsh enviro     

A Ceramic Photonic Crystal Temperature Sensor

Photonic bandgap effects are observed in a disordered array of sol-gel-derived SiO₂ particles prepared via centrifugation of a colloidal suspension. Tunability in the optical response is achieved by infiltrating an organic liquid (1-methylnaphthalene) that possesses a moderately high temperature coefficient of refractive index (d n /d T ) into the interparticle void space. The varying d n /d T value between SiO₂ and 1-methylnaphthalene is used to tune the contrast ratio, relative to temperature. The resulting optical temperature sensor is the first adaptive ceramic photonic crystal of its type, to our knowledge, and provides a proof-of-concept for simple, disposable optical devices that are based on photonic band engineering. Novel applications of optical structures that possess short-range particulate order are discussed, in consideration of the direct analogy between photonic bandgaps and X-ray diffraction.     

Design of a Novel Protein Sensor of High Sensitivity Using a Defective Ternary Photonic Crystal Nanostructure

Silicon - Protein plays a crucial role in building and repairing tissues so it is vital to develop a sensitive and rapid detection biosensor that can detect the concentration of protein in an...     

Passive Integrated Optical Gyroscope Based on Photonic Crystal Ring Resonator for Angular Velocity Sensing

Silicon - In this paper, we investigated the concept of the Sagnac effect in passive integrated optical gyroscope base photonic crystal ring resonator for angular velocity sensing. This...     

Design and Simulation of a Fast All-Optical Modulator Based on Photonic Crystal Using Ring Resonators

Silicon - In the present paper, the design and simulation of a fast all-optical modulator based on the photonic crystal structure have been presented and its performance characteristics have been...     

A Small Size On-chip Temperature Sensor Based on a Microring Resonator

Silicon - In this paper, a small size on-chip temperature sensor based on microring resonator (MRR) is introduced. The sensor consists of a small microring waveguide with a radius of 3.1  ...     

Novel Design for the Temperature Sensing Using Annular Photonic Crystals

Silicon - In this research, a high-performance temperature sensor of a one-dimensional defective annular photonic crystal is proposed. The structure design of our proposed defective annular...     

无线水晶温度传感器特性的改善

以AT切晶体为例,分析了无线温度检测中水晶晶体频率特性的改善方法。由于多种因素都会影响晶体的固有频率,所以为保证晶体温度和频率的单值函数关系,在分析晶体温一频和力一频特性的基础上,通过计算机对晶体的温一频特性进行了修正,进一步对振动引起的晶体频率误差也进行了修正。实验证明：经过上述处理后的仪表可以达到较高的精度。     

High Temperature Microhardness of Single Crystal Mullite

The microhardness ( H ) of single crystal, orthorhombic mullite was measured on (010) and (001) faces from room temperature up to 1400°C. The microhardness versus temperature curves display sigmoidal shapes. The mean microhardness at room temperature is ∼16 Gpa and it decreases with temperature to H is ∼ 13 GPa at 300°C. At >300°C, the microhardness is only slightly reduced with temperature to H is ∼10 GPa at 1000°C. Above this temperature limit, it markedly decreases again, to a mean value of ≈6 GPa at 1400°C. Up to ∼1000°C the (010) and (001) microhardnesses are very similar. Above ∼1000°C, however, the hardness gradually becomes anisotropic, with H ₍₀₁₀₎ being twice as high as H ₍₀₀₁₎ at 1400°C ( H ₍₀₁₀₎∼ 8 GPa, H ₍₀₀₁₎∼ 4 GPa).     

Detection of Escherichia coli K12 in Water Using Slot Waveguide in Cascaded Ring Resonator

Silicon - Escherichia coli (E. coli) bacteria can cause serious fatal health problems in human, thus early and quick pathogen detection of these bacteria is a crucial issue in hospitals, food...     

Detection of Fat Concentration in Milk Using Ternary Photonic Crystal

Silicon - Rapid and sensitive detection of fat concentration in milk is a necessary part for citizens in each country. Bio-photonic sensing techniques are an accurate best way to detect biosensing...     

Design and Modeling of Polarization-Conversion Based all-Optical Basic Logic Gates in a Single Silicon Ring Resonator

Silicon - The demonstration of all-optical basic logic gates using single silicon micro-ring resonator is presented in the paper. Based on the nature of the pump signal rather than its intensity,...     

Determination of Crystal Growth Rates in Glasses Over a Temperature Range Using a Single DSC Run

In this work, we propose and test a simple and accurate technique capable of determining the crystal growth rate, U(T), over a fairly wide temperature range by means of a single differential scanning calorimetry run. This method is based on using 50–200 μm‐thick samples with parallel rough surfaces so that crystal growth is effectively unidirectional and the crystallization fronts have a constant area during the entire crystallization process. Growth rates are calculated from the expression U(T) = L·q·DSC(T)/A_peak, where DSC(T) is the value of the differential scanning calorimetry (DSC) crystallization curve at each temperature T, A_peak is the overall peak area, L is half the sample thickness, and q is the heating rate. This method has been tested for different values of L and q for three glasses undergoing predominantly surface nucleation, that possess distinctly different crystallization behaviors: stoichiometric lithium disilicate and diopside (CaO·MgO·2SiO₂) and a nonstoichiometric lithium‐calcium metasilicate. Growth rates spanning temperature intervals of more than 100 K, including temperature ranges where literature data are scarce due to experimental difficulties, were determined using a single DSC run. The resulting U(T) data were compared with literature data obtained using optical microscopy. The growth rates determined using the proposed method show excellent agreement with the published data for both stoichiometric glasses and only small errors for the nonstoichiometric glass.     

基于温度传感器Pt1000的瓶胆测温系统

针对瓶胆传统测温操作复杂且精度较低的问题,提出了一种新的测温方法,即根据温度系统的特性建立温度系统的电模型。该算法对刚成形的瓶胆进行温度实时检测、数据采集和计算,判定其保温性能是否合格,并把结果通过无线传输发给上位机,实时监测工厂的生产情况。实验结果表明:该算法易于实现,运算时间较短,且测量误差较低,取得了较好的测温效果。     

光子晶体光纤的制备方法和发展趋势

光子晶体光纤(PCF)由于具有传统光纤无法比拟的奇异特性,在短短的十年内研究取得了很大的进展。它的横截面上有较复杂的折射率分布,通常含有不同排列形式的气孔,这些气孔的尺度与光波波长大致在同一量级且贯穿器件的整个长度,光波可以被限制在光纤芯区传播。文章介绍了国内外几种典型的光子晶体光纤光栅的制备方法,PCF的一些独特光学性质,及其在光通信及光传感领域中的应用前景及发展趋势。     

Temperature Dependence of the Raman Spectrum in Lithium Oxide Single Crystal

Temperature dependence of the Raman spectrum of lithium oxide single crystal has been measured over a temperature range of 80 to 1073 K. The frequency shift and the line width of the Raman spectrum in lithium oxide were about 531 and 4.5 cm^-1 at 80 K, respectively. At 1073 K, the frequency shift and the line width attained the values of 464 and 112 cm^-1, respectively. The strong temperature dependence of the frequency shift and line width was compared with data from some crystals with a fluorite structure.     

基于单片机的镀液温度智能控制系统设计

鉴于镀液温度具有时变性、非线性和滞后性等特征,为实现精准监控和实时调节,在常规PID控制器中引入专家控制规则,赋予控制系统自适应、快速响应与实时调节等特性。设计了以单片机为控制核心的镀液温度智能控制系统。仿真结果表明:设计的控制系统能够实现对镀液温度的精准监控和实时调节,控制效果理想。     

Strength of Synthetic Single Crystal Sapphire and Ruby as a Function of Temperature and Orientation

The modulus of rupture of sapphire single crystals was determined as a function of temperature for specimens with orientations favoring plastic deformation and for specimens with unfavorable orientations. From 600°C. to l000°C., the strength of both types increased with increasing temperature, but the increase was more pronounced for the former. Ruby specimens oriented favorably for plastic deformation also showed a large increase in strength. It is conjectured that the increase in strength results from stress relief by microscopic plastic deformation.     

Fabrication of Photonic/Microfluidic Integrated Devices Using an Epoxy Photoresist

Using a single layer of SU‐8 photoresist to fabricate optical waveguide cores and microfluidic channels on Pyrex glass is an ideal way to achieve photonic/microfluidic integration on a single chip. To address the problem of poor bonding, a thin nanoscale intermediate polymer layer was applied to reduce the stress generated from the material processing while maintaining strong adhesion between the patterning polymer layer and Pyrex. It was found that a 186–600 nm thick intermediate layer of a specialty epoxy photoresist effectively served the purpose without deteriorating the optical performance of the involved waveguides. Quality photonic/microfluidic integrated devices with satisfied optical performance were fabricated.

     

透明光子晶体薄膜的力致变色调控及防伪应用

利用SiO2胶体粒子构筑三维蛋白石光子晶体阵列,并将其嵌入聚二甲基硅氧烷（PDMS）弹性体内,制备了一种具有力致变色性能的透明光子晶体薄膜。采用SEM、光纤光谱仪、数码相机等对光子晶体薄膜进行了结构、光学性能的表征,并研究了其在防伪中的应用。结果表明：施加拉力时,该透明光子晶体薄膜显现结构色,并随拉伸量的增加发生持续蓝移,撤销拉力可逆回复至初始状态,且即使经历100次循环拉伸,光子晶体薄膜依旧保持稳定的光学性能。将光子晶体薄膜进行图案化设计,通过施加或撤销拉力可使隐藏于其中的图案快速显现或消失,在防伪领域具有广阔的应用前景。