[其它] 多窗口顶帽变换机载激光点云噪声去除

说明：机载激光雷达系统可以直接有效地获取地物的三维点云信息，为数字高程模型生成和建筑物检测与三维重建提供强有力的数据保障，但原始点云数据不可避免地会产生噪声点。提出了一种基于多窗口顶帽变换的机载激光雷达点云噪声去除算法。首先，根据原始点云间隔对点云进行内插生成网格，分别获取了最大和最小网格数据；然后，对网格数据进行聚类，根据每个聚类区域的尺寸设置阈值，检测出初始噪声点所在网格区域；最后，利用白、黑顶帽变换理论分别对最大和最小网格数据进行处理，检测出最终的噪声点所在网格区域。利用ISPRS数据对此方法和
<weixin_38722874> 上传 | 大小：6mb

[其它] Terahertz wave generation via pre-ionized air plasma

说明：We report the terahertz (THz) wave generation from a single-color scheme modulated by pre-ionized air plasma via an orthogonal pumping geometry. It is found that the amplitude of the THz signal generated by the pump beam tends to decrease gradually w
<weixin_38635794> 上传 | 大小：589kb

[其它] In-fiber integrated optics: an emerging photonics integration technology [Invited]

说明：In-fiber integrated optics is an attempt to use silica fiber as a substrate, integrating various optical paths or optical components into a single fiber, to build a functional optical device or component, and to realize a micro optical system, achiev
<weixin_38518885> 上传 | 大小：1mb

[其它] Wideband tunable optoelectronic oscillator based on a single-bandpass microwave photonic filter and a recirculating dela

说明：A wideband tunable optoelectronic oscillator (OEO) based on a tunable single-bandpass microwave photonic filter (MPF) and a recirculating delay line is proposed and experimentally demonstrated. The MPF is formed by cascading a finite impulse response
<weixin_38699757> 上传 | 大小：884kb

[其它] High resolution inclinometer based on vertical pendulum and fiber Bragg grating Fabry–Perot cavity

说明：In this paper, an inclinometer based on a vertical pendulum and a fiber Bragg grating Fabry–Perot cavity (FBG-FP) is proposed. A low-damping rotation structure is used to reduce the mechanical frictions of the pendulum system and induce a wavelength
<weixin_38597300> 上传 | 大小：681kb

[其它] Highly concentrated phenanthrenequinone-doped poly(MMA-co-ACMO) for volume holography

说明：Novel composite materials are synthesized by incorporating N-acryloylmorpholine (ACMO) in highly concentrated phenanthrenequinone (PQ) doped poly(methyl methacrylate) (PMMA). The photosensitizer concentration of PQ was increased from 0.7 wt. % to 1.8
<weixin_38668335> 上传 | 大小：773kb

[其它] Effects of Casimir force on high-order sideband generation in an optomechanical system

说明：We introduce a Casimir force in a conventional optomechanical system to study the high-order sideband generation. In this system, a nanosphere is placed near the moveable mirror of the conventional optomechanical system. The moveable mirror is couple
<weixin_38670501> 上传 | 大小：346kb

[其它] 44.6 fs pulses from a 257 MHz Er:fiber laser mode-locked by biased NALM

说明：44.6 fs pulses from a 257 MHz, mode-locked non-polarization maintaining Er-doped fiber laser based on a biased nonlinear amplifying loop mirror are reported. The output power is 104 mW and the single-pulse energy is 0.4 nJ. The minimum pulse duration
<weixin_38609913> 上传 | 大小：410kb

[其它] Weak laser pulse signal amplification based on a fiber Brillouin amplifier

说明：We propose a high-gain and frequency-selective amplifier for a weak optical signal based on stimulated Brillouin scattering in a single mode fiber. To be able to satisfy the needs of high gain and high signal-to-noise ratio laser pulse amplification,
<weixin_38723513> 上传 | 大小：484kb

[其它] Objective quantification of chromatic aberration across the visual field of the human eye

说明：A simple and straightforward method to objectively measure the transverse chromatic aberration (TCA) at horizontal field angles out to ±10° from the visual axis of the human eye was proposed. Longitudinal chromatic aberration (LCA) was also measured
<weixin_38597970> 上传 | 大小：425kb

[其它] Customized design and efficient machining of astigmatism-minimized progressive addition lens

说明：Astigmatism is inevitable and inherent to progressive addition lenses (PALs), which are typically distributed in the lateral areas on both sides of the progressive corridor. In this study, we took into account the spectacle frame for the customized f
<weixin_38741759> 上传 | 大小：1mb

[其它] 探测器非线性响应对能见度激光雷达的影响

说明：在光子计数模式的激光雷达应用中，回波信号的动态范围大。激光雷达的远场回波信号处于探测器的线性输出区间，无需进行校准；近场信号基本处于探测器的非线性响应区，需要进行校准。为了提高远场信号的信噪比,提出了一种校准方法。依据脉冲激光雷达方程,使用远场信号反演得到修正的近场信号,并与接收的回波信号作比较，得到校准因子。进一步使用校准因子修正前后的数据分别反演了能见度，并与能见度仪的探测结果作比较。结果显示：对于未修正的数据,远场信号反演与能见度仪得到的能见度平均偏差和标准差分别为0.57 km和1.89
<weixin_38552305> 上传 | 大小：3mb