Accession Number:

ADA239059

Title:

Scientific Imaging System.

Descriptive Note:

Final rept. 1 Dec 88-31 Oct 90,

Corporate Author:

ILLINOIS INST OF TECH CHICAGO DEPT OF MECHANICAL ENGINEERING

Personal Author(s):

Report Date:

1991-06-07

Pagination or Media Count:

7.0

Abstract:

Acquisition of all the necessary components for the scientific imaging system based on absorption and fluorescence spectroscopy for the measurement of concentration and nucleation rate during non-equilibrium synthesis by laser is almost complete. The list of equipment for the assembly of this unique diagnostic system is enclosed. Major components include a 20 W argon-Ion laser and a Ring-Dye laser with various associated electronics. Equipment which has already been delivered and is currently working are marked. The remaining few are in the process of acquisition, awaiting the evaluation of the core laser scanning and detection system. This phased purchase will allow us to specify the remaining electronics to match the performance of core-laser scanning system. The diagnostic technique using this system will involve performing absorption and fluorescence spectroscopy on the plasma produced by a laser beam impinging upon the metallic surface. The diagnostic spectroscopy will use a tunable dye laser Coherent 899-28 to probe a particular transition originating in the ground state of niobium and aluminum. The absorption cross- section at the wavelength of interest 5252 A Nb and 3961 A A1 may be calculated using the tabulated values for the oscillator strengths of the various transitions between hyperfine levels which contribute to absorption at this wavelength.

Subject Categories:

  • Lasers and Masers
  • Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE