Search research articles

Related Concept Videos

Phase Contrast and Differential Interference Contrast Microscopy

Phase Contrast and Differential Interference Contrast Microscopy

Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...

You might also read

Related Articles

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

Sort by

Same author

Sliding Mode Observer with Gain Tuning Method for Passive Interferometric Fiber-Optic Gyroscope.

Sensors (Basel, Switzerland)·2025

Same author

New Optical Voltage Sensor Based on Closed-Loop Pockels Cell and Sliding Mode Observer: Theory and Experiments.

Sensors (Basel, Switzerland)·2025

Same author

Erbium-doped fiber optical source for an IFOG: spectrum dependence on the pump wavelength.

Applied optics·2025

Same author

Takagi-Sugeno Fuzzy Nonlinear Control System for Optical Interferometry.

Sensors (Basel, Switzerland)·2025

Same author

Characterization of a thin-film metal-coated fiber optical phase modulator based on thermal effect with a nonlinear control interferometer.

Applied optics·2021

Same author

Determination of Phase Jumps in the Measurement of Phase Velocity of Samples Obeying a Frequency Power-Law Attenuation Coefficient Using Kramers-Kronig Relations.

IEEE transactions on ultrasonics, ferroelectrics, and frequency control·2020

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

Search research articles

Related Experiment Video

Updated: Sep 2, 2025

Author Spotlight: Unveiling the Potential of VSFG Microscopy in Studying Mesoscopically Heterogeneous Self-Assembled Structures

Author Spotlight: Unveiling the Potential of VSFG Microscopy in Studying Mesoscopically Heterogeneous Self-Assembled Structures

Published on: December 1, 2023

All digital sliding mode observer of a feedback-free interferometer for high dynamic range detection.

Luiz H V Felão, Roberta I Martin, Guilherme A Martinez

|August 1, 2022

Summary

A novel passive interferometry method uses digital control to detect optical phase, simplifying hardware and enhancing dynamic range and robustness for precise displacement measurements.

More Related Videos

Implementation of a Nonlinear Microscope Based on Stimulated Raman Scattering

Implementation of a Nonlinear Microscope Based on Stimulated Raman Scattering

Published on: July 6, 2019

Gain-compensation Methodology for a Sinusoidal Scan of a Galvanometer Mirror in Proportional-Integral-Differential Control Using Pre-emphasis Techniques

Gain-compensation Methodology for a Sinusoidal Scan of a Galvanometer Mirror in Proportional-Integral-Differential Control Using Pre-emphasis Techniques

Published on: April 4, 2017

Related Experiment Videos

Last Updated: Sep 2, 2025

Author Spotlight: Unveiling the Potential of VSFG Microscopy in Studying Mesoscopically Heterogeneous Self-Assembled Structures

Author Spotlight: Unveiling the Potential of VSFG Microscopy in Studying Mesoscopically Heterogeneous Self-Assembled Structures

Published on: December 1, 2023

Implementation of a Nonlinear Microscope Based on Stimulated Raman Scattering

Implementation of a Nonlinear Microscope Based on Stimulated Raman Scattering

Published on: July 6, 2019

Gain-compensation Methodology for a Sinusoidal Scan of a Galvanometer Mirror in Proportional-Integral-Differential Control Using Pre-emphasis Techniques

Gain-compensation Methodology for a Sinusoidal Scan of a Galvanometer Mirror in Proportional-Integral-Differential Control Using Pre-emphasis Techniques

Published on: April 4, 2017

Area of Science:

Optics and Photonics
Control Systems Engineering
Metrology

Background:

Traditional interferometry often requires complex optical setups and feedback mechanisms for accurate phase detection.
Open-loop interferometers typically lack the precision and dynamic range needed for complex displacement measurements.

Purpose of the Study:

To present a passive interferometry phase detection method that emulates closed-loop techniques using digital control.
To enable demodulation of optical phase in feedback-free interferometer hardware.
To measure complex displacements with enhanced accuracy and robustness.

Main Methods:

Development of an all-digital closed-loop observer based on variable structure and sliding modes nonlinear control theory.
Implementation of a passive interferometry system without feedback phase modulators or reset circuits.
Conducting a proof-of-concept experiment measuring displacements from a piezoelectric actuator.

Main Results:

Successful demodulation of optical phase in an open-loop, feedback-free interferometer.
Measurement of complex displacements, including both magnitude and angle.
Demonstrated simplification of optical hardware compared to traditional methods.
Achieved increased dynamic range and high robustness in phase detection.

Conclusions:

The presented passive interferometry method offers a simplified yet effective approach to optical phase detection.
This digital observer-based technique enhances interferometer performance, eliminating the need for feedback components.
The method shows significant potential for precise complex displacement metrology.