Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Interference: Path Lengths01:10

Interference: Path Lengths

1.8K
Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
Two special sources may be considered when they are in phase. This can be easily achieved by feeding the two sources from the same source. An example would be synchronizing the two speakers by feeding them with the same source, such as the sound waves produced by a tuning fork. This setup ensures that the two sources have the same frequency and are...
1.8K
Electronic Distance Measuring Instruments01:30

Electronic Distance Measuring Instruments

408
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...
408
IR Spectrometers01:25

IR Spectrometers

2.1K
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...
2.1K
Linear Approximation in Frequency Domain01:26

Linear Approximation in Frequency Domain

316
Linear systems are characterized by two main properties: superposition and homogeneity. Superposition allows the response to multiple inputs to be the sum of the responses to each individual input. Homogeneity ensures that scaling an input by a scalar results in the response being scaled by the same scalar.
In contrast, nonlinear systems do not inherently possess these properties. However, for small deviations around an operating point, a nonlinear system can often be approximated as linear....
316
Distance Measurements by Taping01:18

Distance Measurements by Taping

373
Tapes are essential in surveying for accurate, durable, and short-distance measurements. Made from lightweight, nylon-coated steel, they offer flexibility and strength for rugged outdoor use. The nylon coating protects against rust and wear, extending the tape's life. Standard lengths, around 30 meters, are marked in meters and millimeters for precision.Surveyors select tapes based on site conditions and accuracy needs. Lightweight, nylon-coated tapes are commonly used for ease of handling and...
373
Time and frequency -Domain Interpretation of Phase-lag Control01:21

Time and frequency -Domain Interpretation of Phase-lag Control

365
Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any...
365

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Distance and Velocity Measurement of Coherent Lidar Based on Chirp Pulse Compression.

Sensors (Basel, Switzerland)·2019
Same author

[Scapular belt for the treatment of comminuted fractures of scapula].

Zhongguo gu shang = China journal of orthopaedics and traumatology·2010
Same author

Manipulation of ordered nanostructures of protonated polyoxometalate through covalently bonded modification.

Chemistry (Weinheim an der Bergstrasse, Germany)·2010
Same author

Developments in nonsteroidal antiandrogens targeting the androgen receptor.

ChemMedChem·2010
Same author

Dynamic presentation of immobilized ligands regulated through biomolecular recognition.

Journal of the American Chemical Society·2010
Same author

[Research on crop-weed discrimination using a field imaging spectrometer].

Guang pu xue yu guang pu fen xi = Guang pu·2010

Related Experiment Video

Updated: Jan 3, 2026

Implementation of a Reference Interferometer for Nanodetection
16:11

Implementation of a Reference Interferometer for Nanodetection

Published on: April 26, 2014

9.7K

Absolute Distance Measurement Using Frequency-Scanning Interferometry Based on Hilbert Phase Subdivision.

Shuo Jiang1,2, Bo Liu2, Huachuang Wang2

  • 1University of Chinese Academy of Sciences, Beijing 100049, China.

Sensors (Basel, Switzerland)
|November 28, 2019
PubMed
Summary

This study presents a novel method for frequency-scanning interferometry (FSI) using Hilbert transforms to shorten auxiliary delay fiber length. This technique enables precise distance measurements with reduced optical path difference, improving efficiency in FSI systems.

Keywords:
Hilbert phase subdivisiondistance measurementfrequency-scanning interferometry

More Related Videos

A Multimodal Wide-Field Fourier-Transform Raman Microscope
06:46

A Multimodal Wide-Field Fourier-Transform Raman Microscope

Published on: December 30, 2025

4
Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform
06:25

Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform

Published on: February 12, 2014

8.7K

Related Experiment Videos

Last Updated: Jan 3, 2026

Implementation of a Reference Interferometer for Nanodetection
16:11

Implementation of a Reference Interferometer for Nanodetection

Published on: April 26, 2014

9.7K
A Multimodal Wide-Field Fourier-Transform Raman Microscope
06:46

A Multimodal Wide-Field Fourier-Transform Raman Microscope

Published on: December 30, 2025

4
Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform
06:25

Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform

Published on: February 12, 2014

8.7K

Area of Science:

  • Optics and Photonics
  • Metrology

Background:

  • Frequency-scanning interferometry (FSI) typically requires a long auxiliary interferometer optical path difference (OPD) to meet Nyquist sampling criteria.
  • Laser frequency nonlinearity can affect measurement accuracy in FSI systems.

Purpose of the Study:

  • To propose and validate a method for shortening the auxiliary interferometer's delay fiber length in FSI.
  • To improve the efficiency and practicality of FSI for distance measurements.

Main Methods:

  • Utilized Hilbert transform to extract the phase of the auxiliary interference signal.
  • Calculated new sampling time points based on subdivided phase intervals.
  • Resampled the main interference signal at these calculated time points.
  • Applied fast Fourier transform (FFT) to the resampled signal for analysis.

Main Results:

  • Successfully measured a target distance of approximately 5 meters with an auxiliary interferometer OPD of only 4.5 meters.
  • Achieved a standard deviation of 4.64 μm in distance measurement results.
  • Demonstrated the effectiveness of the Hilbert transform method in reducing required OPD.

Conclusions:

  • The proposed method effectively reduces the necessary optical path difference in the auxiliary interferometer for FSI.
  • This technique allows for accurate distance measurements with shorter delay fibers, enhancing FSI system practicality.
  • The Hilbert transform approach offers a viable solution for overcoming limitations in traditional FSI sampling strategies.