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Absolute Calibration of Pressure

Absolute Calibration of Pressure. Dead Weight: P=F/a Shock waves: V s = ( D P/ D V) 1/2 Acoustic velocity: V f = (K/ r ) 1/2 V f 2 = V p 2 - 4/3V s 2 K = -(V) ∂P/∂V P = -  K d lnV. Specimen length determined by X-radiography. High Pressure x-ray Studies. Details of SAM 85.

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Absolute Calibration of Pressure

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  1. Absolute Calibration of Pressure • Dead Weight: P=F/a • Shock waves: Vs = (DP/DV)1/2 • Acoustic velocity: Vf= (K/r)1/2 • Vf2= Vp2 - 4/3Vs2 • K = -(V)∂P/∂V • P = -  K dlnV

  2. Specimen length determined by X-radiography High Pressure x-ray Studies Details of SAM 85 Cell assembly for ultrasonic measurement

  3. Sample-(Mg0.83,Fe0.17)O Kung, 2003

  4. Beware Stress • P = Ds*K/m Plastic flow (ultrasonic): length change • Kung ratio, KR = length/d(hkl) • Measure length changes to 10-4 and d to 10-4

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