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相关概念视频

IR Spectrometers01:25

IR Spectrometers

There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
Electronic Distance Measuring Instruments01:30

Electronic Distance Measuring Instruments

Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over short distances...
Influence of Earth's Curvature and Atmospheric Refraction on Leveling01:26

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During leveling, the Earth's curvature and atmospheric refraction introduce deviations in the line of sight from a true horizontal reference. When the line of sight is leveled, it remains perpendicular to the plumb line only at a single point. Beyond this, it deviates due to the Earth’s curvature, represented by the correction C. For a sight distance D, the deviation can be derived using the relationship:This relationship shows that the deviation increases quadratically with distance. Over a...

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梯级格子折射指数传感器的折射指数.

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    此摘要是机器生成的。

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    科学领域:

    • 有光学传感器的感应器.
    • 纳米技术 纳米技术
    • 计量学 计量学 计量学

    背景情况:

    • 现有的光学折射率传感器通常在共振波长分辨率 (RWR) 和折射率灵敏度 (RIS) 之间进行妥协.
    • 需要具有高RWR和高RIS的传感器来精确地确定折射率.

    研究的目的:

    • 设计和演示一种使用梯级格子的新型折射率传感器.
    • 为了同时实现高共振波长分辨率 (RWR) 和高折射率灵敏度 (RIS).
    • 为了扩大动态范围并降低折射率测量检测极限.

    主要方法:

    • 基于梯级格子的折射率传感器的设计.
    • 利用高RWR的等级格子的主要边缘特征.
    • 使用波面分裂干扰用于高RIS和大自由光谱范围 (FSR) 扩展动态范围.

    主要成果:

    • 在实验中实现了2 × 10-2 nm的RWR和1.14 × 104 nm/RIU的RIS.
    • 展示了130nm的大FSR,为1.14 × 10-2 RIU的扩展动态范围做出了贡献.
    • 实现了1.59 × 10-6 RIU的低折射率检测极限.

    结论:

    • 梯级格子折射率传感器成功地结合了高RWR和高RIS.
    • 该传感器具有较低的检测极限,低成本,高稳定性和良好的强度.
    • 在RWR和RIS中存在进一步改进的潜力,使得检测极限更低.