Simple, sensitive, frequency-tuned drop detector

A drop detector has a piezoelectric membrane (1-1) mounted on a substrate (1-5). When a drop strikes the piezoelectric membrane (1-1), the membrane (1-1) vibrates at a selected resonant frequency. The resonant frequency is selected to enhance the sensitivity of the drop detector and the signal-to-no...

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Hauptverfasser: FRANZ, DOUGLAS L, YEUNG, KING WAH W
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creator FRANZ
DOUGLAS L
YEUNG
KING WAH W
description A drop detector has a piezoelectric membrane (1-1) mounted on a substrate (1-5). When a drop strikes the piezoelectric membrane (1-1), the membrane (1-1) vibrates at a selected resonant frequency. The resonant frequency is selected to enhance the sensitivity of the drop detector and the signal-to-noise ratio of the output. The value of the selected resonant frequency depends on the type of material used for the piezoelectric membrane (1-1), the thickness of the membrane (1-1), the mounting of the membrane (1-1) to the substrate (1-5) , and other parameters such as the coating on the membrane (1-1). The vibrations of the membrane (1-1) produce an output signal having a frequency equal to the selected resonant frequency. Since the frequency of the output signal is known, the output signal can be filtered with a bandpass filter to enhance the signal-to-noise ratio of the output signal. The resulting membrane (1-1) drop detector is a high sensitivity, high signal-to-noise ratio drop detector.
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When a drop strikes the piezoelectric membrane (1-1), the membrane (1-1) vibrates at a selected resonant frequency. The resonant frequency is selected to enhance the sensitivity of the drop detector and the signal-to-noise ratio of the output. The value of the selected resonant frequency depends on the type of material used for the piezoelectric membrane (1-1), the thickness of the membrane (1-1), the mounting of the membrane (1-1) to the substrate (1-5) , and other parameters such as the coating on the membrane (1-1). The vibrations of the membrane (1-1) produce an output signal having a frequency equal to the selected resonant frequency. Since the frequency of the output signal is known, the output signal can be filtered with a bandpass filter to enhance the signal-to-noise ratio of the output signal. 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subjects CORRECTION OF TYPOGRAPHICAL ERRORS
DETECTING MASSES OR OBJECTS
GEOPHYSICS
GRAVITATIONAL MEASUREMENTS
i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME
INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
LINING MACHINES
MEASURING
MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER,MECHANICAL EFFICIENCY, OR FLUID PRESSURE
MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION,OR SHOCK
PERFORMING OPERATIONS
PHYSICS
PRINTING
SELECTIVE PRINTING MECHANISMS
STAMPS
TESTING
TRANSPORTING
TYPEWRITERS
title Simple, sensitive, frequency-tuned drop detector
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