Photoelectronic Technology Committee Conferences最新文献_第10页

Study on the premixed laminar flames of iso-octane 异辛烷预混层流火焰的研究

Photoelectronic Technology Committee Conferences Pub Date : 2015-04-13 DOI: 10.1117/12.2179552

Bo-Si Yang, Y. Hong, Qingyao Xu, Yi Liu, Qiuchen Cheng, X. Ding

引用次数: 0

Study on damage of K9 glass under 248nm ultraviolet pulsed laser irradiation 248nm紫外脉冲激光照射下K9玻璃损伤的研究

Photoelectronic Technology Committee Conferences Pub Date : 2015-04-13 DOI: 10.1117/12.2180228

Xi Wang, X. Fang

引用次数: 1

Performance of four-stage thermoelectric cooler for extended wavelength InGaAs detectors 扩展波长InGaAs探测器的四级热电冷却器性能

Photoelectronic Technology Committee Conferences Pub Date : 2015-04-13 DOI: 10.1117/12.2180247

D. Mo, Li-yi Yang, Dafu Liu, Qin-fei Xu, Tao Li, Xue Li

{"title":"Performance of four-stage thermoelectric cooler for extended wavelength InGaAs detectors","authors":"D. Mo, Li-yi Yang, Dafu Liu, Qin-fei Xu, Tao Li, Xue Li","doi":"10.1117/12.2180247","DOIUrl":"https://doi.org/10.1117/12.2180247","url":null,"abstract":"Experimental setup for evaluating four-stage thermoelectric cooler’s performance was designed. Effects of input power, heat dissipation condition and heat load on the temperature difference (ΔT) of four-stage thermoelectric coolers’ hot and cold faces were obtained experimentally. The result shows that, the ΔT increases as the input power increases. A linear relationship exists between input current and feedback voltage. In different cooling conditions, the ΔT of thermoelectric cooler (TEC) increases with the temperature of hot face. As the temperature increasing on hot face is 1K, the ΔT increasing of TEC can be about 0.5K. Meanwhile, the power consumption of TEC also increases slightly. Water condensation can be prevented in either dry nitrogen environment or vacuum environment, but the vacuum level has great influence to the ΔT, especially in low operation temperature. The better the vacuum level is, the smaller the convection heat loss has. When the operation temperature of focal plane array (FPA) is lower than 220K, it is prior to use vacuum packaging. Considering the Joule-heat of readout circuit and the heat loss of wire conduction, the minimum working temperature of FPA can reach below 200 K when the temperature of the hot face is 285K. And the coefficient of performance (COP) of TEC can increase sharply from 0.8% to 4% when the controlled operation temperature is 220K rather than 200K.","PeriodicalId":225534,"journal":{"name":"Photoelectronic Technology Committee Conferences","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133681375","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Study of a sensor based on the series of micro-rings with dual coupling points 基于双耦合点微环系列传感器的研究

Photoelectronic Technology Committee Conferences Pub Date : 2015-04-13 DOI: 10.1117/12.2179267

Xin Li, Shi‐Liang Guo, Ruiqi Piao, Ming Yang

引用次数: 0

Research on dual spectrum solar-blind ultraviolet corona detection system 双光谱日盲紫外日冕探测系统研究

Photoelectronic Technology Committee Conferences Pub Date : 2015-04-13 DOI: 10.1117/12.2180225

Feng Yang, Yan Gu, Jiannin Sun, J. Pan, Bo Zhu, Qi Wang, Xiaoqing Lu

引用次数: 6

Evaluation of thermo-radiation characteristics of IR windows in hypersonic vehicles 高超声速飞行器红外窗热辐射特性评估

Photoelectronic Technology Committee Conferences Pub Date : 2015-04-13 DOI: 10.1117/12.2179338

Yahui Wang, Qiang Wang, B. Zhang, Bo Liang, Li Xu, Hongquan Yun

{"title":"Evaluation of thermo-radiation characteristics of IR windows in hypersonic vehicles","authors":"Yahui Wang, Qiang Wang, B. Zhang, Bo Liang, Li Xu, Hongquan Yun","doi":"10.1117/12.2179338","DOIUrl":"https://doi.org/10.1117/12.2179338","url":null,"abstract":"When hypersonic vehicles have high-hypersonic flights in the atmosphere, high-temperature IR windows become the main factor of complicated aero-thermo-radiation effects, which would reduce the performance of IR detection systems, or even make these systems fail. By analyzing thermal radiation transfer in IR windows, an experimental platform is established to measure thermo-radiation characteristics of IR window materials. And a method is proposed to evaluate thermo-radiation characteristics of IR windows with uneven temperature distribution. Take a MWIR detection system of a hypersonic vehicle as an example, thermo-radiation characteristics of a sapphire IR window is evaluated. The results indicate that, thermo-radiation characteristics of the sapphire IR window material in 3.7μm-4.8μm have an approximate cubic relationship with temperature at 100°C~350°C. With the rise of temperature, the transmittance of the sapphire material decrease, while the window self-radiation increase. As the sapphire IR window is exposed in high-temperature and high-speed airflow, the transmittance drops 4%, still bigger than 95%, self-radiation enhance about 9 times, while temperature of the window rises rapidly. Self-radiation can drive detector into saturation easily, of which the influence on the MWIR detection system is bigger than that of transmittance.","PeriodicalId":225534,"journal":{"name":"Photoelectronic Technology Committee Conferences","volume":"599 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132657022","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

High speed global shutter image sensors for professional applications 高速全球快门图像传感器的专业应用

Photoelectronic Technology Committee Conferences Pub Date : 2015-04-13 DOI: 10.1117/12.2179227

Xuan Wu, G. Meynants

{"title":"High speed global shutter image sensors for professional applications","authors":"Xuan Wu, G. Meynants","doi":"10.1117/12.2179227","DOIUrl":"https://doi.org/10.1117/12.2179227","url":null,"abstract":"Global shutter imagers expand the use to miscellaneous applications, such as machine vision, 3D imaging, medical imaging, space etc. to eliminate motion artifacts in rolling shutter imagers. A low noise global shutter pixel requires more than one non-light sensitive memory to reduce the read noise. But larger memory area reduces the fill-factor of the pixels. Modern micro-lenses technology can compensate this fill-factor loss. Backside illumination (BSI) is another popular technique to improve the pixel fill-factor. But some pixel architecture may not reach sufficient shutter efficiency with backside illumination. Non-light sensitive memory elements make the fabrication with BSI possible. Machine vision like fast inspection system, medical imaging like 3D medical or scientific applications always ask for high frame rate global shutter image sensors. Thanks to the CMOS technology, fast Analog-to-digital converters (ADCs) can be integrated on chip. Dual correlated double sampling (CDS) on chip ADC with high interface digital data rate reduces the read noise and makes more on-chip operation control. As a result, a global shutter imager with digital interface is a very popular solution for applications with high performance and high frame rate requirements. In this paper we will review the global shutter architectures developed in CMOSIS, discuss their optimization process and compare their performances after fabrication.","PeriodicalId":225534,"journal":{"name":"Photoelectronic Technology Committee Conferences","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132775207","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Quality evaluation of adaptive optical image based on DCT and Rényi entropy 基于DCT和rsamnyi熵的自适应光学图像质量评价

Photoelectronic Technology Committee Conferences Pub Date : 2015-04-13 DOI: 10.1117/12.2182768

Yuannan Xu, Junwei Li, Jing Wang, Rong Deng, Yanbing Dong

{"title":"Quality evaluation of adaptive optical image based on DCT and Rényi entropy","authors":"Yuannan Xu, Junwei Li, Jing Wang, Rong Deng, Yanbing Dong","doi":"10.1117/12.2182768","DOIUrl":"https://doi.org/10.1117/12.2182768","url":null,"abstract":"The adaptive optical telescopes play a more and more important role in the detection system on the ground, and the adaptive optical images are so many that we need find a suitable method of quality evaluation to choose good quality images automatically in order to save human power. It is well known that the adaptive optical images are no-reference images. In this paper, a new logarithmic evaluation method based on the use of the discrete cosine transform(DCT) and Rényi entropy for the adaptive optical images is proposed. Through the DCT using one or two dimension window, the statistical property of Rényi entropy for images is studied. The different directional Rényi entropy maps of an input image containing different information content are obtained. The mean values of different directional Rényi entropy maps are calculated. For image quality evaluation, the different directional Rényi entropy and its standard deviation corresponding to region of interest is selected as an indicator for the anisotropy of the images. The standard deviation of different directional Rényi entropy is obtained as the quality evaluation value for adaptive optical image. Experimental results show the proposed method that the sorting quality matches well with the visual inspection.","PeriodicalId":225534,"journal":{"name":"Photoelectronic Technology Committee Conferences","volume":"125 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123320488","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Surface morphology of LPE-growth GaSb quantum dots lpe生长的GaSb量子点的表面形貌

Photoelectronic Technology Committee Conferences Pub Date : 2015-04-13 DOI: 10.1117/12.2182638

Yang Wang, Shuhong Hu, Y. Lv, N. Dai

引用次数: 0

Test of reflective MTN liquid crystal cell for the LCOS microdisplay by guided wave method 导波法测试LCOS微显示用反射MTN液晶单元

Photoelectronic Technology Committee Conferences Pub Date : 2015-04-13 DOI: 10.1117/12.2180037

Zhi-dong Zhang, Guili Zheng, Hui Zhang, Libin Si, W. Ye

{"title":"Test of reflective MTN liquid crystal cell for the LCOS microdisplay by guided wave method","authors":"Zhi-dong Zhang, Guili Zheng, Hui Zhang, Libin Si, W. Ye","doi":"10.1117/12.2180037","DOIUrl":"https://doi.org/10.1117/12.2180037","url":null,"abstract":"In order to confirm the function of MTN model in our LCOS microdisplay device, we made the MTN test cell, in which low substrate is also glass instead of silicon. Since a standard commercial-like liquid crystal cell with low index glass( with an index close to 1.52) plate is to be investigated by a guided model technique to unravel the director profile through the cell, the low index improved fully leaky guided model(IFLGM) technique are chosen. At higher applied voltages (in our study U≥5.0 V(rms), the voltage-dependent reflectance can not be distinguished. In this range of the applied voltage, the electric fields create tiny difference in the distribution of the director only near the substrates and waveguide signals are just sensitive to this difference. Fitting the data in reflection by using the modeling-program based upon multilayer optical theory together with continuum theory gives the information about the pre-tilt and twist of the director as well as the parameters of different optical layers. We found that the pre-tilt angle on the top substrate is smaller 1° than that on the bottom in the best fit, this suggests that the ITO and the aluminum coatings have different effects on the alignment layers.","PeriodicalId":225534,"journal":{"name":"Photoelectronic Technology Committee Conferences","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125284948","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0