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...

Ausführliche Beschreibung

Gespeichert in:

Bibliographische Detailangaben
Hauptverfasser:	FRANZ, DOUGLAS L, YEUNG, KING WAH W
Format:	Patent
Sprache:	eng
Schlagworte:	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
Online-Zugang:	Volltext bestellen
Tags:	Tag hinzufügen Keine Tags, Fügen Sie den ersten Tag hinzu!

Beschreibung
Zusammenfassung:	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.