The apparatus of claim 8, wherein the insulating material comprises a perfluorinated polyether.ġ0.
The apparatus of claim 1, wherein the insulating material is a liquid configured to wet to the piezoelectric resonator better than water or oil.ĩ. The apparatus of claim 6, wherein the bond comprises the discontinuity.Ĩ. The apparatus of claim 1, wherein the piezoelectric resonator comprises a tuning fork, wherein the tuning fork comprises a first tuning fork section having a first surface and a second tuning fork section having a second surface, wherein the electrode is embedded between the first section and the second section, and wherein the tuning fork further comprises a bond between the first surface and the second surface.ħ. The apparatus of claim 4, wherein the discontinuity penetrates to the electrode.Ħ. The apparatus of claim 1, wherein the discontinuity comprises at least one of a crack, a fissure, and a depression.ĥ. The apparatus of claim 1, wherein the piezoelectric resonator is made of lithium niobate.Ĥ.
The apparatus of claim 1, wherein the insulating material comprises a low dielectric constant.ģ. An apparatus for estimating a property of a fluid, the apparatus comprising: a piezoelectric resonator configured to be disposed in the fluid an electrode embedded in the piezoelectric resonator and included in a resonator circuit configured to output an electrical signal related to the property a discontinuity defined by a surface of the piezoelectric resonator, the discontinuity altering an impedance of the resonator circuit if a high-dielectric fluid or a conductive fluid is disposed in the discontinuity and an insulating material disposed in the discontinuity.Ģ. METHODS AND APPARATUS TO FACILITATE GROUND FAULT PROTECTION AND SELF TEST WITH A SINGLE SWITCHĮlectronic probe housing for steam turbineġ. Method and a device for monitoring the dispersed aqueous phase of an oil-water emulsionĪPPARATUS FOR PERFORMING A STRESS TEST TO ISOLATE AND MEASURE NOISE IN A PAIRED LINE AND METHOD FOR PERFORMING A STRESS TEST TO ISOLATE AND MEASURE NOISE IN A PAIRED LINE Method and apparatus for non-destructive detection of defects in composite laminate structures PROBE MODULE FOR DETECTING CONTACT PERFORMANCE
The experimental results show that the output speed of the actuator is positively linearly related to the excitation voltage, the maximum output thrust is 8 N when the excitation voltage is 100 V, the excitation frequency is 20.1 kHz, the pre-pressure is 7.5 N, the phase difference of the excitation signal is π/2, and the output speed of the actuator can reach 116 mm/s.SYSTEM AND METHOD FOR MAGNETIC RESONANCE FINGERPRINTINGĭevice for analysing the composition of the contents of a receptacle including an analysis receptacle After optimizing the stator chamfer to 2.5 and 4.5 mm, the tangential amplitude difference of the 15° tuning fork angle actuator is the smallest. The simulation results show that the integrated output performance of the piezoelectric actuator is best when the angle of the tuning fork is 15°. The externally applied conditions (the influence model of excitation voltage, excitation frequency, and pre-pressure) on the performance output of piezoelectric actuators will promote the miniaturization and industrialization of tuning fork piezoelectric actuators in the next step. Aiming at the problems of low output speed, large size, and difficult miniaturization of stacked and sandwich piezoelectric actuators, a patch-type tuning fork piezoelectric actuator model based on the stick-slip effect was designed, in which the dynamic theoretical analysis, the simulation optimization to determine the stator structure parameters, and the experimental research were carried out to obtain the stator structure parameters.
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