Title:
周波数領域フォトンマイグレーションを用いたパウダーの特徴付け
Document Type and Number:
Japanese Patent JP2005519261
Kind Code:
A
Abstract:
Characterizing a powder bed includes generating measurements by repeating the following. A location of the powder bed is illuminated with light having a time varying intensity with a resolution of less than one hundred nanoseconds. The particles scatter the light to alter the time varying intensity. The light propagates through a portion of the particles that defines a sampled volume. The light received from the powder bed is detected. The altered time-varying intensity of the light is measured to generate a time-dependent signal having a time-dependence that is less than or equal to a time-of-flight of a photon of the propagating light. An optical property is determined from the time-dependent signal, and a characteristic is determined from the optical property. The sampled volume is determined, and variance of the measurements is calculated. Uniformity of the powder bed is determined in accordance with the variance and the sampled volume.
Inventors:
Sevik Melaka, Eva, M
Sun, Zigang
Bread, Tian Shu
Sun, Zigang
Bread, Tian Shu
Application Number:
JP2003538724A
Publication Date:
June 30, 2005
Filing Date:
October 22, 2002
Export Citation:
Assignee:
The, Texus, A, And, M, Euniversati, Sistim
International Classes:
G01N21/27; G01N15/02; G01N21/51; G01J3/44; G01N15/00; G01N21/85; (IPC1-7): G01N21/27
Attorney, Agent or Firm:
Yuzo Sanada
Nobuhiko Nakajima
Ohara Shizuo
Nobuhiko Nakajima
Ohara Shizuo