Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Time and frequency -Domain Interpretation of Phase-lead Control

Time and frequency -Domain Interpretation of Phase-lead Control

Phase-lead controllers are commonly used in various control systems to enhance response speed and stability. Adjusting the brightness on a television screen offers a practical example of phase-lead control. When contrast is enhanced, a phase-lead controller is employed. Mathematically, phase-lead control is identified when the first parameter is smaller than the second.
The design of phase-lead control involves the strategic placement of poles and zeros to balance steady-state error and system...

Time and frequency -Domain Interpretation of Phase-lag Control

Time and frequency -Domain Interpretation of Phase-lag Control

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 finite,...

Reconstruction of Signal using Interpolation

Reconstruction of Signal using Interpolation

Signal processing techniques are essential for accurately converting continuous signals to digital formats and vice versa. When a continuous signal is sampled with a period T, the resulting sampled signal exhibits replicas of the original spectrum in the frequency domain, spaced at intervals equal to the sampling frequency. To handle this sampled signal, a zero-order hold method can be applied, which creates a piecewise constant signal by retaining each sample's value until the next sampling...

Linear Approximation in Time Domain

Linear Approximation in Time Domain

Nonlinear systems often require sophisticated approaches for accurate modeling and analysis, with state-space representation being particularly effective. This method is especially useful for systems where variables and parameters vary with time or operating conditions, such as in a simple pendulum or a translational mechanical system with nonlinear springs.
For a simple pendulum with a mass evenly distributed along its length and the center of mass located at half the pendulum's length, the...

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...

Transformation of Plane Strain

Transformation of Plane Strain

When analyzing elongated structures like bars subjected to uniformly distributed loads, it is essential to understand the transformation of plane strain when coordinate axes are rotated. This transformation helps to assess how material deformation characteristics vary with orientation, which is crucial in materials science and structural engineering.
Under plane strain conditions, typical for members where one dimension significantly exceeds the others, deformations and resultant strains are...

You might also read

Related Articles

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

Sort by

Same author

Thermalization and criticality on an analogue-digital quantum simulator.

Nature·2025

Same author

Phase transitions in random circuit sampling.

Nature·2024

Same author

Dynamics of magnetization at infinite temperature in a Heisenberg spin chain.

Science (New York, N.Y.)·2024

Same author

Stable quantum-correlated many-body states through engineered dissipation.

Science (New York, N.Y.)·2024

Same author

Formation of robust bound states of interacting microwave photons.

Nature·2022

Same author

The national evolution of cardiovascular CT practice: a UK NHS perspective.

International journal of cardiology·2013

Search research articles

Related Experiment Video

Updated: Jun 20, 2026

Sample Drift Correction Following 4D Confocal Time-lapse Imaging

Sample Drift Correction Following 4D Confocal Time-lapse Imaging

Published on: April 12, 2014

Real-time joint transform correlator with phase conjugation for distortion correction.

M C Hamilton¹, B L Powers

¹Missiles and Electronics Group, LTV Aerospace and Defense Company, Dallas, Texas 75265, USA.

|September 11, 2009

Summary

This summary is machine-generated.

This study demonstrates a joint transform correlator using phase conjugation in a barium titanate (BaTiO3) crystal. This system corrects spatial light modulator distortions for real-time optical correlation, even with slow photorefractive effects.

More Related Videos

Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform

Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform

Published on: February 12, 2014

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

Published on: January 28, 2019

Related Experiment Videos

Last Updated: Jun 20, 2026

Sample Drift Correction Following 4D Confocal Time-lapse Imaging

Sample Drift Correction Following 4D Confocal Time-lapse Imaging

Published on: April 12, 2014

Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform

Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform

Published on: February 12, 2014

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

Published on: January 28, 2019

Area of Science:

Optics and Photonics
Nonlinear Optics
Image Processing

Background:

Joint transform correlators (JTCs) are essential for optical pattern recognition.
Spatial light modulators (SLMs), like liquid-crystal televisions (LCTVs), introduce distortions that degrade correlation performance.
Phase conjugation offers a method to correct optical aberrations.

Purpose of the Study:

To demonstrate a joint transform correlator (JTC) incorporating phase conjugation for distortion correction.
To achieve real-time optical correlation despite the limitations of photorefractive materials.
To evaluate the performance and sensitivity of the phase-conjugate JTC.

Main Methods:

A JTC architecture was designed utilizing a barium titanate (BaTiO3) crystal for phase conjugation.
The BaTiO3 crystal compensated for distortions introduced by a liquid-crystal television (LCTV) SLM.
Real-time correlation experiments were conducted using video camera inputs of stationary scenes.

Main Results:

The phase-conjugate JTC successfully corrected for LCTV-induced distortions.
Real-time correlation outputs were obtained and displayed on a video monitor.
The correlator's sensitivity to target rotation was analyzed, demonstrating its practical applicability.

Conclusions:

Phase conjugation in BaTiO3 crystals effectively corrects SLM distortions in JTCs.
The proposed optical arrangement enables real-time optical correlation, overcoming the slow photorefractive effect limitations.
The system shows promise for robust pattern recognition applications sensitive to input distortions and target orientation.