PZT disk

This micro device consists of a round or square micro chamber machined in a bottom plate sealed by a cover slip with double-sided adhesive tape [23], Sound irradiation was achieved by a PZT disk below. The PZT disk was bonded by super glue to the surface of the micro chamber. The PZT disk was driven by an HP functional generator... 

The sound was generated by the PZT disk driven by an HP functional generator [24]. 

Ultrasonic vibration (49 kHz) of a PZT disk adhered to a Si chip through a thin Si diaphragm was used for degassing in a portable dialysis system. When the dissolved 02 in the dialysate is reduced to 6 ppm (from 8 ppm), no 02 gas bubbles will be generated inside the dialyzer during normal operation [404]. 

FIGURE 3.46 Schematic drawing of the cross section of a mixer. A glass plate was etched with channels. It was anodically bonded with a Si wafer consisting of the oscillating diaphragm to which a PZT disk was adhered [327]. Reprinted with permission from Wiley-... 

Micropumps based on piezoelectrics are made of pumping chambers that are actuated by three piezoelectric lead zirconate titanate disks (PZT). The pump consists of an inlet, pump chambers, three silicon membranes, three normally closed active valves, three bulk PZT actuators, three actuation reservoirs, flow microchannels, and outlet. The actuator is controlled by the peristaltic motion that drives the liquid in the pump. The inlet and outlet of the micropump are made of a Pyrex glass, which makes it biocompatible. Gold is deposited between the actuators and the silicon membrane to act as an upper electrode. Silver functions as a lower electrode and is deposited on the sidewalls of the actuation reservoirs. In this design, three different pump chambers can be actuated separately by each bulk PZT actuator in a peristaltic motion. 

No chemical interactions between the sample solution and PZT. Especially aggressive, acidic solutions can dissolve constituents out of the PZT material. The impurities can cause photoacoustic perturbation signals which create much interference in weakly absorbing solutions. The use of bare piezooeramic disks or piezoceramic tubes as a sample container represents an undesirable source of contamination. It is found that even surface-treated (gold-plated) piezo tubes are not resistant to many acids. 

As analytical results, three PZT-5A elements were analyzed by the FEM, of which material properties were known. These are a cylindrical element of 9.53 mm diameter and 12.19 mm height, a disk-shaped element of 9.53 mm diameter and 1.45 mm height, and a truncated conical element of 6 mm base-diameter, 1 mm tmncated end-diameter and 2.5 mm height. 

AE Sensors The AE sensors used in salt mines detect AE signals in a comparatively broad frequency range from 1 to 100 kHz. The sensors are typical AE sensors which use a piezoelectric disk of PZT with broad resonance peak at 70 kHz. Usually, the measured frequencies are in the low frequency range below 30 kHz, only at small distance between the source and receiver below 20 m the high-frequency peak is more pronounced. 

A simple resonator is a thin disk type, electroded on its plane faces and vibrating radially, for filter applications with a center frequency ranging from 200 kHz to 1 MHz and with a bandwidth of several percent of the center frequency. For a frequency of 455 kHz, the disk diameter needs to be about 5.6mm. However, if the required frequency is higher than 10 MHz, other modes of vibration such as the thickness extensional mode are exploited, because of its smaller size. The trapped-energy type filters made from PZT ceramics have been widely used in the intermediate frequency range for applications such as the 10.7 MHz FM radio receiver and transmitter. When the trapped-energy phenomena are... 

A lead containing a piezoceramic disk (e. g. PZT) is reduced on one side by high temperature treatment in direct contact with a carbon block. This reduced layer is no longer piezoelectric but therefore a good electric conductor. Due to the thermal expansion mismatch between the reduced and oxide layers, a curvature develops in the structure, giving it a dome (or rainbow) shape. 

Amorphous nanopowders of Pb(Zro.5Tio.s)03 (PZT) were prepared by the usual sol-gel process starting from titanimn (IV) butoxide, zirconium(IV) butoxide, lead acetate trihydrate and butyl alcohol (Surowiak, 2001). The gels dried at 300°C were ground to powder sanples and were pressed at a pressure of 2 x 10 Pa to make disk-shaped powder compacts, hi order to obtain sintered compacts with a maximum density and relatively... 

Another area of interest is the measurement of opaque or strongly absorbing liquids. A simple open PA cell called an optothermal window was developed for this purpose as displayed in Figure 2B. It essentially consists of an uncoated ZnSe window to which an annular lead zirconate titanate (PZT) piezotransducer is glued from the bottom. The excitation beam from a laser passes unobstructed through this window and is absorbed by a droplet of the sample deposited on the other side of the ZnSe disc. The generated heat diffuses into the disk which... 

---