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

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
Confocal Fluorescence Microscopy01:16

Confocal Fluorescence Microscopy

Confocal microscopy is an advanced microscopic technique. The prime advantage of the confocal microscope over other microscopy techniques is its ability to block the out-of-focus light from the illuminated samples using pinholes. It is widely used with fluorescence optics to obtain high-resolution, sharp contrast images. Unlike optical microscopes, confocal microscopes use a focused beam of light laser to scan the entire sample surface at different z-planes. These microscopes are, therefore,...
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...

You might also read

Related Articles

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

Sort by
Same author

Orbital integrated path differential absorption lidar at 1.84 µm for detecting water sources on Mars.

Optics express·2025
Same author

Airborne Lidar Measurements of XCO<sub>2</sub> in Synoptically Active Environment and Associated Comparisons With Numerical Simulations.

Journal of geophysical research. Atmospheres : JGR·2022
Same author

Binary phase shift keying on orthogonal carriers for multi-channel CO2 absorption measurements in the presence of thin clouds.

Optics express·2015
Same author

Super-resolution technique for CW lidar using Fourier transform reordering and Richardson-Lucy deconvolution.

Optics letters·2014
Same author

High-resolution CW lidar altimetry using repeating intensity-modulated waveforms and Fourier transform reordering.

Optics letters·2014
Same author

Advanced sine wave modulation of continuous wave laser system for atmospheric CO(2) differential absorption measurements.

Applied optics·2014

Related Experiment Video

Updated: May 11, 2026

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
09:38

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

Published on: December 18, 2015

Nonlinear swept frequency technique for CO2 measurements using a CW laser system.

Joel F Campbell1

  • 1NASA Langley Research Center Hampton, Virginia 23681, USA. joel.f.campbell@nasa.gov

Applied Optics
|May 15, 2013
PubMed
Summary

This study introduces a novel system using nonlinear multiswept sine waves for simultaneous carbon dioxide (CO2) measurements. The method enhances channel separation and cloud rejection for accurate atmospheric analysis.

More Related Videos

Implementation of a Coherent Anti-Stokes Raman Scattering (CARS) System on a Ti:Sapphire and OPO Laser Based Standard Laser Scanning Microscope
12:54

Implementation of a Coherent Anti-Stokes Raman Scattering (CARS) System on a Ti:Sapphire and OPO Laser Based Standard Laser Scanning Microscope

Published on: July 17, 2016

Related Experiment Videos

Last Updated: May 11, 2026

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
09:38

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

Published on: December 18, 2015

Implementation of a Coherent Anti-Stokes Raman Scattering (CARS) System on a Ti:Sapphire and OPO Laser Based Standard Laser Scanning Microscope
12:54

Implementation of a Coherent Anti-Stokes Raman Scattering (CARS) System on a Ti:Sapphire and OPO Laser Based Standard Laser Scanning Microscope

Published on: July 17, 2016

Area of Science:

  • Atmospheric Science
  • Optical Sensing
  • Signal Processing

Background:

  • Accurate carbon dioxide (CO2) monitoring is crucial for climate studies.
  • Existing methods face challenges in simultaneous, multi-channel measurements and atmospheric interference.
  • Need for advanced signal processing techniques to improve atmospheric sensing capabilities.

Purpose of the Study:

  • To present a novel system for simultaneous online/offline CO2 measurements using nonlinear multiswept sine waves.
  • To develop an analytic expression and systematic method for determining orthogonal frequencies.
  • To demonstrate improved performance in channel separation and thin cloud rejection.

Main Methods:

  • Utilized a nonlinear multiswept sine wave system with multichannel multiswept orthogonal waves.
  • Developed an analytic expression for determining orthogonal frequencies across different swept cases (unswept, linear, nonlinear).
  • Applied signal processing to reduce autocorrelation function sidelobes while maintaining cross-channel orthogonality.

Main Results:

  • Successfully demonstrated simultaneous, multi-channel CO2 measurements.
  • Presented a validated method for calculating orthogonal frequencies for various wave types.
  • Showcased the system's ability to reject thin clouds by optimizing autocorrelation properties.

Conclusions:

  • The described nonlinear multiswept sine wave system offers a robust approach for advanced CO2 sensing.
  • The developed frequency determination method enhances system versatility and accuracy.
  • This technique shows significant potential for improving atmospheric monitoring and climate research.