Vibration densitometer with high drive efficiency and signal...

Details Vibration densitometer with high drive efficiency and signal... Vibration densitometer with high drive efficiency and signal...

G - Physics

01

N

73/81, 73/83

G01N 9/00 (2006.01)

Patent

CA 1113273

ABSTRACT OF THE DISCLOSURE A vibration densitometer including a probe having a vibratable member. Apparatus having an input lead is provided which is actuable to impart vibration to the member. A piezoelectric crystal has an output lead, the crystal producing a signal. A loop circuit has an input lead connected from the crystal output lead to form an electromechanical oscillator, the loop circuit producing an output signal which is 90 electrical degrees leading and thereby out of Phase with the signal on the crystal output lend. The loop circuit includes a phase lock loop. The phase lock loop includes a phase detector having first and second input leads, an output lead, a voltage controlled oscillator (VCO) having an input lead and an output lead, a resistor connected from the phase detector output lead to the VCO input lead, a capacitor connected from the VCO input lead to ground, a unijunction transistor having a gate connected from the VCO input lead, the VCO output lead being connected to the phase detector second input lead. An input circuit is connected from the crystal output lead to the phase detector first input lead. The apparatus includes a magnetostrictive driver having a coil, the loop circuit impressing the same signal on the coil as the signal on the loop output lead to cause the coil current to have the same phase as said same signal.

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