Laser interferometric fringes

Figure 14 Images obtained by means of laser interferometry showing the behavior of CO2 bubbles injected into ethanol for (a) pure solvent and (b) solvent saturated with CO2 T = 363.15 K, P = 8 MPa, the bubble diameter is about 1.6 mm. The interferometric fringes show intensive mass transfer in the solvent...

Optical methods of spectrometer calibration include laser interferometric methods and Moire fringe counting techniques. Since such methods depend on the accurately known wavelength of light (for example, 6328.1983 A for a He-Ne laser at 293 K under standard conditions), they are independent of any assumptions made in the iron foil technique and, thus, are intrinsically more reliable. Moreover, such methods do not require the acquisition of57 Co Mdssbauer sources and reference materials for iron absorber studies and may thus be attractive... 

The advent of lasers allowed optical interferometry to become a useful and accurate technique to determine surface motion in shocked materials. The two most commonly used interferometric systems are the VISAR (Barker and Hollenbach, 1972) and the Fabry-Perot velocity interferometer (Johnson and Burgess, 1968 Durand et al., 1977). Both systems produce interference fringe shifts which are proportional to the Doppler shift of the laser light reflected from the moving specimen surface. Both can accommodate a speci-... 

In the interferometric dilatometer, the change in length of the sample causes the movement of interference fringes. Knowing the laser wavelength and counting the moved fringes, it is possible to deduce the dilatation of the sample. Hereafter, we shall briefly describe a very simple interferometric dilatometer used for the measurement of the linear contraction coefficient of Torlon. For a more detailed description of this dilatometer, see ref. [53],... 

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