Abonnement à la biblothèque: Guest
Portail numérique Bibliothèque numérique eBooks Revues Références et comptes rendus Collections
International Journal of Energetic Materials and Chemical Propulsion
ESCI SJR: 0.149 SNIP: 0.16 CiteScore™: 0.29

ISSN Imprimer: 2150-766X
ISSN En ligne: 2150-7678

International Journal of Energetic Materials and Chemical Propulsion

DOI: 10.1615/IntJEnergeticMaterialsChemProp.v3.i1-6.280
pages 271-284

MEASUREMENT OF THREE-DIMENSIONAL TEMPERATURE FIELDS BY HETERODYNE HOLOGRAPHIC INTERFEROMETRY

B. Ineichen
Swiss Federal Institute of Technology, Internal Combustion Engines Laboratory Ch-8092 Zurich, Switzerland
R. Muller
Swiss Federal Institute of Technology, Internal Combustion Engines Laboratory Ch-8092 Zurich, Switzerland

RÉSUMÉ

Holographic interferometry is a powerful tool to measure the deviation between two wavefields within a fraction of the wavelength of the coherent monochromatic light source. In the reconstruction of the double-exposure hologram, the phase difference of the wavefronts due to a different spatial refractive index distribution of the two object states shows up as an intensity modulation, the resulting interference fringe pattern. Starting at a point of the field where the temperature remained constant, the temperature at any point in the field can be obtained by detecting the total phase difference at this position.
However, with classical holographic interferometry, quantitative information on the interference phase is only reliable in the minima and maxima of the fringes, corresponding to multiples of 180° or π. The interpolation between the fringes is difficult and not very accurate. Furthermore, in regimes of higher fringe concentration, for example in the boundary layer near the wall, background illumination and image noise due to the laser speckles reduce the fringe contrast.
Based on the idea of heterodyne holographic interferometry, we introduce a small frequency shift between the optical frequencies of two reference wave fields. This results in an intensity modulation at the beat frequency of approx. 100 kHz of the two light fields for any given point in the interference pattern. Due to the fact that this method works fine for phase objects like a hot gas, it becomes an important approach to visualize and analyze heat transfer in boundary layers.
The experimental verification of heterodyne interferometry for heat transfer measurements will be presented, and the properties of this technique will be discussed.


Articles with similar content:

HEAT TRANSFER MEASUREMENT THROUGH HETERODYNE HOLOGRAPHIC INTERFEROMETRY
International Heat Transfer Conference 10, Vol.4, 1994, issue
R. Muller
METEOROID FALL INTO THE OCEAN: IMPACT ON SOLAR RADIATION TRANSFER
ICHMT DIGITAL LIBRARY ONLINE, Vol.15, 2001, issue
B. A. Klumov
Natural ELF Electromagnetic Pulses
Telecommunications and Radio Engineering, Vol.51, 1997, issue 1
Alexander P. Nikolaenko
Quasi-Optimum Algorithm for Radioholographic System Antenna Self-Focusing for reception as to Single Target with Its Location Evaluation in the Presence of Additive and Multiplicative Disturbances
Telecommunications and Radio Engineering, Vol.51, 1997, issue 4
N. I. Matyukhin
Spatial Filtering With a Discrete Nonequidistant Array
Telecommunications and Radio Engineering, Vol.52, 1998, issue 9
V. P. Titar, T. V. Bogdanova