基于数据融合降低气温测量辐射误差的仿真分析与试验研究          下载免费PDF全文

陈高颖  刘清惓  丁仁惠  杨杰  姜帆 《气象科学》2021,41(3):404-409

地表气温上升速度约为0.1 ℃/（10 a），然而受太阳辐射影响，地面气象站观测到的气温会高于真实大气温度，存在1 ℃量级的辐射误差。因此，本文提出了一种基于数据融合的铝壳温度传感器设计。首先，利用流体动力学方法计算温度传感器在不同环境条件下的辐射误差。其次，为获得连续辐射误差结果，利用神经网络算法对辐射误差数值计算结果进行学习，形成误差订正方程。最后，将太阳辐射误差订正方程修正值与试验结果进行对比。结果表明，基于数据融合的铝壳温度传感器可将辐射误差降至0.05 ℃以内。  相似文献   

Analytical solution for distributed torsional low strain integrity test for pipe pile     

Yunpeng Zhang  Guosheng Jiang  Wenbing Wu  M. Hesham El Naggar  Hao Liu  Minjie Wen  Kuihua Wang 《国际地质力学数值与分析法杂志》2022,46(1):47-67

Low strain integrity tests (LSITs) are the most popular non-destructive methods for pile testing. However, traditional LSITs have encountered unprecedented challenges as the need for long pile and existing pile testing keeps multiplying. Compared to traditional longitudinal excitations, the torsional wave is less influenced by the velocity attenuation effect and can be subjected at the pile shaft for existing piles. Distributed torsional LSIT is proposed in this article with the presentation of the corresponding analytical solutions that exhibiting the velocity responses along the pile shaft. The solution is verified with previous simplified theoretical and rigorous finite element method (FEM) answers. At the end, the application of this method is exhibited through the identification of necking and concrete segregation defects on pipe piles, which shows the advantage of this method on long pile testing.  相似文献   

系缆式剖面测量系统模型波浪水槽试验设计   总被引：1，自引：1，他引：0  

李永军  董涛  李家军  李墨  陈雷 《海洋技术学报》2009,28(1)

针对系缆式剖面测量系统模型在波浪水槽试验设计中,各项试验条件和获取参数的设定、数据的获取方法和模型设计及传感器使用进行了阐述,供有关人员参考交流.  相似文献   

用于深海极端环境下的pH电极制备方法改进   总被引：2，自引：2，他引：0       下载免费PDF全文

潘依雯  叶瑛  韩沉花 《海洋学报》2010,32(2):73-79

pH值是表征深海热液环境以及扩散流区域溶液化学性能的基本参数,因此原位精确获取溶液pH值是很多海洋科学研究者关注的问题。以前试制的电化学原位传感器IrOx电极,在实际海试中虽然对海底异常信号有响应,但由于信号漂移问题,电极只能用于定性地发现异常。基于熔融碳酸锂氧化金属原理,提出了改进传统熔融碳酸锂法,并设计了强制空气对流和碳酸锂添加过氧化钠两种制备方法。通过实验室的性能测试以及相应的表面扫描电镜测试表明,用改进的方法制得的电极,校正曲线均符合能斯特定律。用强制空气对流和混合碳酸锂/过氧化钠法制得的电极,其性能均明显优于传统熔融碳酸锂法。可推断,在熔融碳酸锂氧化贵金属铱的过程中,氧含量的充分与否是影响IrOx电极的性能和表面形态的重要因素,其中性能最优的是混合碳酸锂/过氧化钠法制得的电极。该类电极具有如下优点:重复性好;在大跨度pH溶液之间的响应快速稳定,长时间连续监测的漂移小于5 mV;同一批次所制备电极性能几乎相同;使用寿命长等。因此,该pH电极可用于深海的原位探测。该工作为进一步制备高性能的IrOx电极奠定了坚实的基础。  相似文献   

Scientific detector workshop 2022 on-sky performance verification of near-infrared e−APD technology for wavefront sensing and demonstration of e−APD pixel performance to improve the sensitivity of large science focal planes     

Gert Finger  Frank Eisenhauer  Reinhard Genzel  Christopher Mandla  Ian Baker  Domingo Alvarez  Antonio Amorim  Wolfgang Brandner  Christophe Dupuy  Casey Deen  Derek Ives  Leander Mehrgan  Manfred Meyer  Karin Perraut  Guy Perrin  Jörg Stegmeier  Christian Straubmeier  Harald J. Weller  Vincent Isgar 《Astronomische Nachrichten》2023,344(8-9):e20230069

Near-infrared adaptive optics as well as fringe tracking for coherent beam combination in optical interferometry require the development of high-speed sensors. Because of the high speed, a large analog bandwidth is required. The short exposure times result in small signal levels which require noiseless detection. Both requirements cannot be met by state-of-the-art conventional CMOS technology of near-infrared arrays as has been attempted previously. A total of five near-infrared SAPHIRA 320 × 256 pixel HgCdTe e⁻APD arrays have been deployed in the wavefront sensors and in the fringe tracker of the VLTI instrument GRAVITY. The current limiting magnitude for coherent exposures with GRAVITY is m_k = 19, which is made possible with ADP technology. New avalanche photo-diode array (APD) developments since GRAVITY include the extension of the spectral sensitivity to the wavelength range from 0.8 to 2.5 μm. After GRAVITY a larger format array with 512 × 512 pixels has been developed for both AO applications at the ELT and for long integration times. Since dark currents of <10⁻³ e⁻/s have been demonstrated with 1Kx1K e⁻APD arrays and 2Kx2K e⁻APD arrays have already been developed, the possibilities and adaptations of e⁻APD technology to provide noiseless large-format science-grade arrays for long integration times are also discussed.  相似文献