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Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
10:39

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Published on: October 11, 2016

Thermal-light-based ranging using second-order coherence.

Jun Zhu1, Xiaoxiang Chen, Peng Huang

  • 1State Key Laboratory of Advanced Optical Communication Systems and Networks, Department of Electronic Engineering, Shanghai Jiaotong University, Shanghai, China. bierhoff_24@126.com

Applied Optics
|July 12, 2012
PubMed
Summary
This summary is machine-generated.

A new thermal-light ranging method uses second-order coherence for ultrahigh accuracy in absolute range measurement. This noise-immune technique offers nanometer-scale precision with advanced detectors.

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Area of Science:

  • Optics and Photonics
  • Metrology

Background:

  • Traditional ranging methods face limitations in accuracy and noise immunity.
  • Absolute range measurement requires high precision, often challenged by environmental factors.

Purpose of the Study:

  • To propose and investigate a novel thermal-light-based ranging scheme.
  • To achieve ultrahigh accuracy in absolute range measurements.
  • To demonstrate high noise immunity and absence of measuring dead zones.

Main Methods:

  • Utilizing second-order coherence in the time domain for thermal light.
  • Developing a proof-of-principle experimental setup.
  • Analyzing experimental data to assess accuracy and limitations.

Main Results:

  • Demonstrated a ±10 cm accuracy at a distance of 1 km in a proof-of-principle experiment.
  • Identified detector limitations as the primary factor for current accuracy.
  • Projected potential for nanometer-scale accuracy with improved detectors and algorithms.

Conclusions:

  • The proposed thermal-light ranging scheme offers a promising approach for ultrahigh-accuracy measurements.
  • The method exhibits inherent advantages in noise immunity and operational range.
  • Future advancements in detector technology and data processing can unlock the full potential for nanometer-level precision.