Ms. Yan Y.Sun Sun Profile

Yan Y.Sun Sun

at Beijing University of Technology

SPIE Involvement:

Author

Publications (1)

This will count as one of your downloads.

You will have access to both the presentation and article (if available).

DOWNLOAD NOW

This content is available for download via your institution's subscription. To access this item, please sign in to your personal account.

Email or Username Forgot your username?

Password Forgot your password?

Show

Keep me signed in

No SPIE account? Create an account

Proceedings Article | 18 September 2014 Paper

Autofocused dual wavelength digital holography for microstructure measurement

Yan Sun, Dayong Wang, Spozmai Panezai, Lu Rong, Yunxin Wang

Proceedings Volume 9282, 92820K (2014) https://doi.org/10.1117/12.2067873

KEYWORDS: Digital holography, Reconstruction algorithms, Holograms, 3D image reconstruction, Phase measurement, Beam splitters, Signal to noise ratio, Distance measurement, Charge-coupled devices, Fourier transforms

Read Abstract +

Dual wavelength digital holography is an effective technique for the measurement of object profile with the discontinuities especially for an object of thickness greater than single wavelength. However; phase information of the two reconstructed images obtained by two different wavelengths usually can’t match precisely. As a result, signal to noise ratio (SNR) of reconstructed image of the equivalent wavelength increases and the real phase information of object can’t be measured accurately. It is because in space multiplex system, the focal plane asymmetry is produced due to the discrepancy between the two wavelengths through the splitter and CCD front lens, which worsens the mismatching of the two phase information. In this paper, the method of refocusing two holograms with autofocusing algorithm based on the gradient square criterion is proposed. The matching error can be decreased easily since two real distances for the reconstruction of object information are obtained. Considering the advantages of autofocusing algorithm, the phase of sample can be measured quickly with accuracy. This method provides a basis for real-time reconstruction of dual wavelength digital holography in micro-structure measurement field. Finally, the off-axis Fresnel digital holography is implemented with Mach-Zehnder setup to verify the effectiveness of the proposed method and the three-dimensional morphology of phase grating is measured successfully.

My Library

You currently do not have any folders to save your paper to! Create a new folder below.

Folder Name

Folder Description

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks. You are receiving this notice because your organization may not have SPIE eBooks access.*

*Shibboleth/Open Athens users─please sign in to access your institution's subscriptions.

To obtain this item, you may purchase the complete book in print or electronic format on SPIE.org.

ORGANIZATIONAL
Sign in with credentials provided by your organization.

Organizational Username

Organizational Password

Show/Hide Password

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

;

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members:

Non-members: ADD TO CART

Keywords/Phrases

Search In:

Publication Years