Retrieving of laser beam intensity distribution from the temperature along surface of heated thin target

V. Aksenov, Yu Isaev, E. Zakharova, V. Reino, R. Tsvik

Результат исследований: Материалы для книги/типы отчетовМатериалы для конференции

Аннотация

When studying the regularities of variations of laser beam parameters, a problem arises to measure the intensity J(ρ, t) in the beam cross section. One of the possible methods of intensity measurement is its reconstruction from the temperature field T(ρ, t) on the target surface. The theory of solving of the inverse heat transfer problem and results of numerical experiment for uniform target irradiated by nonuniform laser beam was reported. In the case of a thin thermally insulated target the following relationship was obtained. (1 - R)I(ρ, t) = k L/a2[∂/∂t T(ρ, t) - a2 Δ T(ρ, t)]. where R is the reflection coefficient; a2 and k are the thermal diffusivity and conductivity, respectively; L is the target thickness; Δ = ∂/∂x2 + ∂/∂y2 is the transverse Laplacian operator. Deriving algorithms for this equation, the authors use the difference procedure. For decreasing of the effect of random errors filtration of initial data is performed. A simple and effective filter that ensures satisfactory accuracy is the convolution of initial data with a stabilizing function sinc(x) = sin(αmax x)/π x, αmax ≈ 2 cm-1.

Язык оригиналаАнглийский
Название основной публикацииConference on Lasers and Electro-Optics Europe - Technical Digest
Редакторы Anon
Страницы249
Число страниц1
СостояниеОпубликовано - 1996
Опубликовано для внешнего пользованияДа
СобытиеProceedings of the 1996 Conference on Lasers and Electro-Optics Europe, CLEO/Europe - Hamburg, Ger
Продолжительность: 8 сен 199613 сен 1996

Конференция

КонференцияProceedings of the 1996 Conference on Lasers and Electro-Optics Europe, CLEO/Europe
ГородHamburg, Ger
Период8.9.9613.9.96

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering

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  • Цитировать

    Aksenov, V., Isaev, Y., Zakharova, E., Reino, V., & Tsvik, R. (1996). Retrieving of laser beam intensity distribution from the temperature along surface of heated thin target. В Anon (Ред.), Conference on Lasers and Electro-Optics Europe - Technical Digest (стр. 249)