87 results about "Piezoelectric accelerometer" patented technology

The invention discloses a piezoelectric transduction type magnetostrictive sensor used for liquid level (displacement) measurement and a piezoelectric type torsional wave transducer thereof. The piezoelectric type torsional wave transducer comprises a waveguide wire, the output section of the waveguide wire is provided with an amplification rod, and the ends of the amplification rod are connectedwith piezoelectric elements. After a torsional wave signal is transmitted to the amplification rod through the waveguide wire and is amplified, the torsional wave signal is converted into an electricsignal and output. A normal line of each piezoelectric element is vertical to the waveguide wire and the amplification rod. The amplification rod converts circumferential torsional waves transmitted by the waveguide wire into distortion approximate to a linear direction on the normal line of each piezoelectric element so as to act on the piezoelectric elements to generate charges. Two ends of theamplification rod are respectively provided with the piezoelectric elements with same polar directions, and the piezoelectric elements can simultaneously generate differential piezoelectric signals. The piezoelectric type torsional wave transducer has the advantages that the commonly-used piezoelectric ceramic plates of a thickness oscillating mode are used as the piezoelectric elements, thus thecost is low; the transducer has simple structure and simplified process; and the piezoelectric elements can be used for directly converting mechanical signals into voltage signals, thus the advantages of fewer links and high sensitivity are achieved.

The sheared bottom-insulated piezoelectric accelerometer, capable of using at high temperature of 200 deg.C is characterized by that its piezoelectric sensing element is a modified lead metanibate high-temp. piezoelectric ceramics made up by using Ca (2+) or Ba (2+) and adding rare-earth oxide. At the same time it adopts a high specific weight elconite mass block, and uses glass body as insulating material of signal output device instead of fluoroplastics, and can uses polyimide material which can be used at 200-250 deg.C for a long period and possesses high impedance and good abrasive resistance to make insulator, and the internal cavity of insulator can be any one kind of inner hexagon, tetragonal or star form. It adopts screw and epoxy resin adhesive double connection process to fix said insulator to the base seat to the accelerometer.