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SCHEMES FOR MEASUREMENT
DESIGN OF THE ULTRASONIC THICKNESS
2 other sections not shown
accuracy acoustic impedance altimeter amplitude artificial ice barium titanate boundary capacitance capacitor chapter couplant coupling critical distance step crystal oscillating cuit cycles delay multivibrator delayed trigger dielectric ducer electrical Electrical Network electromagnetic wave equivalent circuit experimentation FIGURE forced damping Frequency Modulated Technique gas tube grid harmonic holder ice depth ice measurements ice properties ice samples ice thickness measuring II-l inches initial displacement Lake Mendota linear longitudinal sound waves longitudinal waves magnetostrictive MASTER MULTIVIBRATOR mechanical medium ment method natural ice obtained oscillation oscilloscope phase piezoelectric transducer plate positive pulse potentiometer produce pulse radar technique pulse technique pulsed ultrasonic received echo receiving transducer reflection repetition rate resonance shear wave shorting tube shown in Fig sound transmission temperature tests thickness h thickness measuring system thyratron tion trans transmitted and received transmitted pulse trigger circuit unidirectional measurements values velocity of sound voltage volts wavelength Young's modulus