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使用从超级连续体中获得的间模式节拍来进行光折度校正的距离测量
Optics express
|April 4, 2024
概括
本研究介绍了一种基于超级连续的方法,用于准确测量距离. 它使用两种光学波长对折射率变化进行校正,从而实现精确的远距离测量.
科学领域:
- 光学计量学是指光学计量学.
- 干涉测量是干涉测量的方法.
- 超级连续性的产生.
背景情况:
- 精确的距离测量在各种科学和工业应用中至关重要.
- 大气条件,特别是折射率的变化,在光学距离测量中引入了重大错误.
- 传统方法通常需要外部传感器或复杂的环境监测来弥补折射率变化.
研究的目的:
- 展示一种基于超级连续的方法,用于高精度的距离测量.
- 通过在两个光学波长的同时测量来实现直线折射率补偿.
- 通过减轻未知的折射率引起的偏差来实现精确的距离估计.
主要方法:
- 使用一个超连续 (SC) 源,从一个780nm频连贯扩展,跨越570-970nm.
- 通过分析590nm和890nm的间模式节拍的相延迟观测,进行了距离测量.
- 引入受控的折射率变化,使用在15米路径上的压力变化进行测试补偿.
主要成果:
- 取得的距离测量在50米处的标准偏差约为0.01毫米.
- 在单个光谱频段上观察到距离依赖的成分低于0.2 ppm.
- 经过折射率校正的距离测量证明,在60秒的平均值中标准偏差为~0.08毫米,尽管诱导的光路长度变化为0.4毫米.
结论:
- 基于超级连续的双色法有效地弥补了线内折射率的变化.
- 该系统提供了高精度 (超过50米的0.1 ppm残留量) 并可扩展到多波长测量.
- 这种方法对于需要精确的环境补偿的实际远距离计量应用具有重大潜力.
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