Mr. Dong Shengye Profile

Dong Shengye

at Univ. of Pittsburgh

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 | 27 May 2022 Presentation + Paper

Machine vision approach of process control during single crystal fiber growth via laser heated pedestal growth method

Dolendra Karki, Edward Hoffman, Dong Shengye, Victoria Taylor Schmotzer, Bo Liu, Paul Ohodnicki

Proceedings Volume 12105, 1210508 (2022) https://doi.org/10.1117/12.2618538

KEYWORDS: Laser stabilization, Crystals, Process control, Machine vision, Feedback loops, LabVIEW, Fiber optics sensors

Read Abstract +

Laser heated pedestal growth (LHPG) method is a unique technique to grow single crystal fibers and fibrous materials of high temperature ceramics for various photonic and electronic applications. The stability of the solidification process and the floating molten zone created at the interface between the feed and seed materials is critical for ensuring high quality of the fiber including uniformity of diameter. To maintain the molten zone volume constant throughout the dynamic growth process, the typical LHPG system control scheme will modify the relative speed control of fiber-pull rate versus the source material feed rate as constrained by mass conservation. However, due to the dynamic nature of the growth process and the floating state of the molten material, it is prone to instability due to non-uniform heating, heat loss, melt convection, seed-fiber and pedestal material alignments, and other factors which impact growth processes. Sustainable growth process demands a combination of optimized optical components and real-time process controls. Here we present a detailed optical analysis of several candidate LHPG optical designs and compare details of the illumination at the molten zone region during the growth process. In addition, we explore the potential for enhancing the typical process control by utilizing (1) active laser power control and (2) machine vision methods for real-time characterization of the molten zone profile to be integrated into active control schemes. Impacts on the quality of the fiber grown in terms of uniformity in diameters upon active laser power feedback loop to mitigate the molten zone shape variation is also discussed.

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