Related Experiment Video
Updated: Jun 23, 2025
07:45
Quasi-light Storage for Optical Data Packets
Published on: February 6, 2014
10.8K
Impact of Cyclic Error on Absolute Distance Measurement Based on Optical Frequency Combs
Runmin Li1, Haochen Tian2,3, Junkai Shi1
1Optoelectronic Technology Center, Institute of Microelectronics of the Chinese Academy of Sciences, Beijing 100029, China.
Sensors (Basel, Switzerland)
|June 19, 2024
Summary
Cyclic error impacts absolute distance measurements using optical frequency combs (OFCs). Selecting a suitable reference path length minimizes this error in interferometry, enhancing measurement linearity.
Area of Science:
- Metrology
- Optical Engineering
- Precision Measurement
Background:
- Optical frequency combs (OFCs) enable high-precision absolute distance measurements with large non-ambiguity range (NAR) and high update rates.
- Cyclic error is a significant challenge in OFC-based measurements, compromising linearity and accuracy.
Purpose of the Study:
- To quantitatively investigate the impact of cyclic error on absolute distance measurements using OFCs.
- To explore strategies for mitigating cyclic error in synthetic wavelength interferometry and single-wavelength interferometry.
Main Methods:
- Numerical calculations were performed to analyze cyclic error effects.
- Two interferometric techniques were combined: synthetic wavelength interferometry and single-wavelength interferometry.
- The influence of reference path length and synthetic wavelength selection was evaluated.
Main Results:
- A suitable reference path length was identified as a key factor in minimizing cyclic error when combining interferometric methods.
- Recommendations for selecting synthetic wavelengths were provided to balance NAR and error mitigation.
- The study quantifies the impact of cyclic error, offering insights into its reduction.
Conclusions:
- Optimizing reference path length and synthetic wavelength selection is crucial for accurate OFC-based absolute distance measurements.
- The findings are applicable to various OFC applications, including surface profiling and vibration analysis.
- This research provides practical guidance for improving the linearity and reliability of distance measurements.
Related Concept Videos
01:15Distance Corrections
27
To achieve precise distance measurements, especially in surveying and construction, certain corrections must be applied to account for potential sources of error like the standardization errors, temperature variations, and slope adjustments.Standardization error emerges when measurement equipment undergoes changes, such as wear, repairs, or weather impacts. To address this, surveyors compare the equipment’s readings to a standard. This process identifies any deviation that might lead to...
27
01:30Electronic Distance Measuring Instruments
32
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...
32
01:26Influence of Earth's Curvature and Atmospheric Refraction on Leveling
91
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.
91
01:14NMR Spectrometers: Resolution and Error Correction
684
When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
684
01:18Aliasing
128
Accurate signal sampling and reconstruction are crucial in various signal-processing applications. A time-domain signal's spectrum can be revealed using its Fourier transform. When this signal is sampled at a specific frequency, it results in multiple scaled replicas of the original spectrum in the frequency domain. The spacing of these replicas is determined by the sampling frequency.
If the sampling frequency is below the Nyquist rate, these replicas overlap, preventing the original...
If the sampling frequency is below the Nyquist rate, these replicas overlap, preventing the original...
128
01:05Doppler Effect - II
3.4K
The Doppler effect has several practical, real-world applications. For instance, meteorologists use Doppler radars to interpret weather events based on the Doppler effect. Typically, a transmitter emits radio waves at a specific frequency toward the sky from a weather station. The radio waves bounce off the clouds and precipitation and travel back to the weather station. The radio frequency of the waves reflected back to the station appears to decrease if the clouds or precipitation are moving...
3.4K