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The TEA CO2 laser as a means of generating ultrasound in solids

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Figure

Fig 2.2 a& b Out-of-plane and in-plane sensitive EMAT designs respectively .
Fig 3.5 Surface defect types considered to be the origin of thermionic electron emission in the initiation of gas
Fig 3.6 function o f temperature for an incident radiation wavelength
Fig 3.10 a , b & c Streak camera meaiuremenU for increasing laser
+7

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is the radiation wavelength , V o the peak to peak photodetector output and x the sample surface displacement For small displacements the small 3-10 which for an incident power density of 5*10® Wcm*2 gives a time for full is the Dirac delta function, Z the source strength and H a Heaviside time function then the resultant epicentral and surface displacement W : 3Z 8itpr exp(-a2(t-xo)2) a&b The solution of the shear wave displacement is essentially the same although a 6.16 where R is the sample radius Terms in a , the source radius , are due to the result which is due to the summation over frequency components within the To remove this effect and verify the effect of a well defined top-hat source , an adjustable aperture was used to produce circular thermoelastic sources of

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