Dynamic parameters, such as restitution and friction coefficients are important for powder flow simulations of laser based deposition processes. These parameters are difficult to find, especially for industrial metal powders. This paper introduces an optical method for measuring restitution and friction coefficients. The free falling powder flow was illuminated by a laser sheet. In order to obtain particle velocity, streaks proportional to particle velocities was generated by laser pulse obtained by a chopper. Recorded imaged were analyzed to determine particle velocities both before and after various impact conditions as well as impact parameters.

Meeting Name

16th Annual Solid Freeform Fabrication Symposium (2005: Aug. 1-3, Austin, TX)


Mechanical and Aerospace Engineering

Research Center/Lab(s)

Intelligent Systems Center


This research was supported by the National Science Foundation Grant Number DMI- 9871185, Army Research Office, and Air Force Research Laboratory and UMR Intelligent Systems Center. Their support is appreciated.

Document Type

Article - Conference proceedings

Document Version

Final Version

File Type




Publication Date

03 Aug 2005

Included in

Manufacturing Commons