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

Imaging Biological Samples with Optical Microscopy

Imaging Biological Samples with Optical Microscopy

Optical microscopy uses optic principles to provide detailed images of samples. Antonie van Leeuwenhoek designed the first compound optical microscope in the 17th century to visualize blood cells, bacteria, and yeast cells. In 1830, Joseph Jackson Lister created an essentially modern light microscope. The 20th century saw the development of microscopes with enhanced magnification and resolution.
In optical microscopy, the specimen to be viewed is placed on a glass slide and clipped on the stage...

You might also read

Related Articles

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

Sort by

Same author

A study of the predonation hemoglobin and iron status among Hong Kong Chinese blood donors.

Transfusion·2012

Same author

Effectiveness and cost-effectiveness of sentinel lymph node biopsy compared with axillary node dissection in patients with early-stage breast cancer: a decision model analysis.

British journal of cancer·2012

Same author

Clinically significant red blood cell antibodies in chronically transfused patients: a survey of Chinese thalassemia major patients and literature review.

Transfusion·2012

Same author

Epidemiological changes in hepatitis A in Korea: increasing age and its effect on clinical outcomes.

Epidemiology and infection·2012

Same author

Risk factor analysis of hepatitis C virus infection among Chinese blood donors in Hong Kong.

Transfusion medicine (Oxford, England)·2012

Same author

Successful treatment with anti-tumor necrosis factor alpha for reactive small-bowel amyloidosis.

Endoscopy·2011

Search research articles

Related Experiment Video

Updated: Jul 6, 2026

Free-form Light Actuators — Fabrication and Control of Actuation in Microscopic Scale

Free-form Light Actuators — Fabrication and Control of Actuation in Microscopic Scale

Published on: May 25, 2016

Cylindrical-type nanometer-resolution laser diffractive optical encoder.

C T Hsieh¹, C K Lee

¹AHEAD Optoelectronics, Inc, No 13 Chin-ho Road, Chung-ho, Taipei hsien 235, Taiwan. hsieh@ahead.com.tw

|March 8, 2008

Summary

This summary is machine-generated.

A novel cylindrical diffractive optical encoder design cancels wave-front aberrations. This innovative system demonstrates high tolerance for misalignment, confirmed by experimental validation.

More Related Videos

Implementation of a Reference Interferometer for Nanodetection

Implementation of a Reference Interferometer for Nanodetection

Published on: April 26, 2014

Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization

Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization

Published on: July 5, 2016

Related Experiment Videos

Last Updated: Jul 6, 2026

Free-form Light Actuators — Fabrication and Control of Actuation in Microscopic Scale

Free-form Light Actuators — Fabrication and Control of Actuation in Microscopic Scale

Published on: May 25, 2016

Implementation of a Reference Interferometer for Nanodetection

Implementation of a Reference Interferometer for Nanodetection

Published on: April 26, 2014

Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization

Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization

Published on: July 5, 2016

Area of Science:

Optical Engineering
Metrology
Diffractive Optics

Background:

Optical encoders are crucial for precise motion control.
Traditional encoders face challenges with wave-front aberrations and grating misalignment.
Existing designs often struggle to maintain accuracy under non-ideal conditions.

Purpose of the Study:

To propose a new cylindrical-type diffractive optical encoder design.
To achieve complete cancellation of wave-front aberrations.
To enhance desensitization to grating misalignment for improved encoder performance.

Main Methods:

A novel cylindrical diffractive optical encoder design was conceptualized.
Wave-front aberration cancellation was achieved using a virtual point source and 1x magnification telescopes.
Optical design software (Code V) was used for performance simulation and tolerance analysis.
Experimental verification was performed using a Hewlett-Packard laser interferometer.

Main Results:

The proposed design effectively cancels wave-front aberrations induced by the rotation disk.
Tolerance analysis confirmed the system's capability to compensate for aberrations and misalignment.
Experimental results validated the performance and merits of the new cylindrical encoder system.

Conclusions:

The developed cylindrical diffractive optical encoder offers superior performance by eliminating aberrations.
The design exhibits high tolerance to optical component misalignment.
This new encoder technology presents a significant advancement in precision measurement systems.