相关实验视频
Updated: Jul 16, 2025

10:41
Method to Measure Tone of Axial and Proximal Muscle
Published on: December 14, 2011
17.6K
概括
这项研究模拟了使用快速转向镜和信标成像的激光脉冲漫游校正系统. 在现实的条件下,最佳性能取决于平衡光圈大小和信号噪声比.
科学领域:
- 光学物理学的光学物理.
- 光束传播的传递.
- 适应光学适应光学
背景情况:
- 自通道激光脉冲可以经历漫游,降低光束质量.
- 快速转向镜和信标成像为实时校正提供了一个潜在的解决方案.
- 同轴成像系统旨在利用互惠来实现精确的波面控制.
研究的目的:
- 分析一个用于纠正自导向激光脉冲流浪的系统.
- 调查成像系统参数对校正有效性的影响.
- 在不同的传播和噪声条件下确定最佳系统配置.
主要方法:
- 使用快速转向镜模拟激光脉冲流浪校正系统.
- 模拟一个同轴成像望远镜,用于合作的信标反.
- 分析不同传播条件和噪声水平的系统性能.
主要成果:
- 在理想条件下,当接收光圈与脉冲大小相匹配时,最大限度地提高互惠性,就会显示出最大的性能.
- 在现实的场景中,噪音和有限的信标功率,较小的光圈是最优的.
- 最佳光圈尺寸平衡信号噪声比与光子数量和分辨率.
结论:
- 激光脉冲漫游校正的有效性受到理想成像条件偏差的限制.
- 系统性能对光圈大小,图像噪声和信标功率之间的相互作用非常敏感.
- 在最大化互惠和保持足够的信号噪声比率之间存在一种权衡,以有效地纠正流浪.
相关概念视频
Stability of structures
195
In mechanical engineering, the stability of systems under various forces is critical for designing durable and efficient structures. One fundamental way to explore these concepts is by analyzing systems like two rods connected at a pivot point, O, with a torsional spring of spring constant k at the pivot point. This system is similar in appearance to a scissor jack used to change tires on a car. In this case, the arms of the linkage (equivalent to the rods in this system) are entirely vertical,...
195
Upward Impending Motion
328
A square-threaded screw jack is a mechanical device widely used for lifting heavy loads or applying considerable force. Its operation is based on converting the force applied at its handle into a torsional moment, causing the upward impending motion of the screw. This movement is accomplished by overcoming the static friction between the threads of the screw and the jack.
To better comprehend how a screw jack functions, consider the completely unraveled thread as a block in contact with the...
To better comprehend how a screw jack functions, consider the completely unraveled thread as a block in contact with the...
328
Relative Motion Analysis - Acceleration
378
A slider-crank mechanism converts rotational motion from the crank into linear motion of the slider or vice versa. This mechanism consists of three main parts: the crank, the connecting rod, and the slider. The movement of the slider-crank is an example of general plane motion as the fluctuating angle between the crank and the connecting rod. Consider a segment AB where point A is at the end of the slider and point B is on the diametrically opposite end to point A, on a crack. The variance in...
378
Support Reactions
457
A coplanar force system refers to a set of forces that all lie in the same plane and are subject to different reactions between the point of contact and the supports. Understanding how different types of supports affect coplanar forces is crucial for designing safe and reliable structures that can withstand external loads.
The purpose of the supports is to prevent the translational motion of the system by applying an equal and opposite force and to prevent the system's rotation by applying...
The purpose of the supports is to prevent the translational motion of the system by applying an equal and opposite force and to prevent the system's rotation by applying...
457
Mechanical Systems
229
Mechanical systems are analogous to to electrical networks where springs and masses play similar roles to inductors and capacitors, respectively. A viscous damper in mechanical systems functions similarly to a resistor in electrical networks, dissipating energy. The forces acting on a mass in such systems include an applied force in the direction of motion, counteracted by forces from the spring, a viscous damper, and the mass's acceleration. This interplay of forces is mathematically...
229
Frictional Forces on Screws
1.2K
Screws are characterized by a helical ridge known as a thread wrapped around a cylindrical shaft. They are commonly used as fasteners to hold objects together or to transmit power and motion in machines. One type of screw that is particularly useful for transmitting power is the square-threaded screw.
A jack with a square-threaded screw is a mechanical device used to lift heavy loads by applying a force at its handle. When the force is applied, the screw turns, raising the load. The screw can...
A jack with a square-threaded screw is a mechanical device used to lift heavy loads by applying a force at its handle. When the force is applied, the screw turns, raising the load. The screw can...
1.2K

