Various systems, devices, and methods for a vehicle smart brake pad comprising a sensor such as a force sensing device, and a production process thereof. For example, a production process of a vehicle brake pad can include the following steps in time sequence: applying an electrical circuit a support plate; screen printing on the electrical circuit of at least a first electrode; screen printing on the at least first electrode of a sheet of piezoelectric material; screen printing on the sheet of at least a second electrode; applying a friction pad on the support plate; and bulk polarizing the sheet of piezoelectric material by a supply of power to the at least first and second electrodes.

An RF integrated circuit device can includes a substrate and a High Electron Mobility Transistor (HEMT) device on the substrate including a ScAlN layer configured to provide a buffer layer of the HEMT device to confine formation of a 2DEG channel region of the HEMT device. An RF piezoelectric resonator device can be on the substrate including the ScAlN layer sandwiched between a top electrode and a bottom electrode of the RF piezoelectric resonator device to provide a piezoelectric resonator for the RF piezoelectric resonator device.

A piezoelectric sensor, a manufacturing method thereof and an electronic device are provided. The piezoelectric sensor includes a substrate, an active layer, the active layer being disposed at a side of the substrate: a first electrode, the first electrode being disposed at a side of the active laver a wav from the substrate, and the first electrode including a plurality of sub-electrodes disposed at intervals: a piezoelectric layer, the piezoelectric layer being disposed at a side of the first electrode away from the active layer; and a second electrode, the second electrode being disposed at a side of the piezoelectric layer away from the first electrode. The active layer is configured to be capable of switching between an insulating state and a conducting state, and in the conducting state the active layer is capable of conducting the plurality of sub-electrodes.

A piezoelectric sensor, a manufacturing method thereof and an electronic device are provided. The piezoelectric sensor includes a substrate, an active layer, the active layer being disposed at a side of the substrate: a first electrode, the first electrode being disposed at a side of the active laver a wav from the substrate, and the first electrode including a plurality of sub-electrodes disposed at intervals: a piezoelectric layer, the piezoelectric layer being disposed at a side of the first electrode away from the active layer; and a second electrode, the second electrode being disposed at a side of the piezoelectric layer away from the first electrode. The active layer is configured to be capable of switching between an insulating state and a conducting state, and in the conducting state the active layer is capable of conducting the plurality of sub-electrodes.

A method for polarizing a piezoelectric film is described. In this method, a piezoelectric film is formed by using an injection deposition method. The piezoelectric film is flat adhered to a surface of a conductive substrate. A polarization process is performed on the piezoelectric film while the piezoelectric film is flat adhered to the surface of the conductive substrate by generating static electricity on the adhesion surface of the piezoelectric film, and generating the static electricity on the adhesion surface of the piezoelectric film comprises using a pressurized gas to blow the adhesion surface, and the adhesion surface of the piezoelectric film is adhered to the even surface of the conductive substrate by an electrostatic adsorption method.

A method for polarizing a piezoelectric film is described. In this method, a piezoelectric film is formed by using an injection deposition method. The piezoelectric film is flat adhered to a surface of a conductive substrate. A polarization process is performed on the piezoelectric film while the piezoelectric film is flat adhered to the surface of the conductive substrate by generating static electricity on the adhesion surface of the piezoelectric film, and generating the static electricity on the adhesion surface of the piezoelectric film comprises using a pressurized gas to blow the adhesion surface, and the adhesion surface of the piezoelectric film is adhered to the even surface of the conductive substrate by an electrostatic adsorption method.

A method of additively-manufacturing a flexible sensor system having a lattice topology includes a number of electrical interconnects, each having one or more electrically-conductive layers alternately sandwiched between two or more dielectric layers, and two or more sensors defining a sensor array, each sensor located at an intersection of and electrically connected to the interconnects on the lattice topology and electrically-connected to the interconnects. Each of the electrically-conductive layers includes a cured material base and silver, copper, aluminum, gold, platinum, ruthenium, carbon, and/or alloys thereof, and each of the dielectric layers includes a cured material base. The additively-manufactured flexible sensor system is configured to be installed on the surface of an asset for the monitoring of that asset.

The disclosed embodiments are generally directed to optical systems. The optical systems may include a proximal lens that may transmit light toward an eye of a user. The optical systems may also include a distal lens that may, in combination with the proximal lens, correct for at least a portion of a refractive error of the eye of the user. The optical systems may further include a selective transmission interface. The selective transmission interface may couple the proximal lens to the distal lens, transmits light having a selected property, and does not transmit light that does not have the selected property. The optical system can also include an accommodative lens, such as a liquid lens. Various other methods, systems, and computer-readable media are also disclosed.

Proposed is a method for producing a polymeric piezoelectric composite having boron nitride nanotubes (BNNT) dispersed therein, the method including: a solution-providing step for providing a polymeric solution; a dispersing step for dispersing BNNT in the polymeric solution; and an electro spinning step for electro spinning the polymeric solution with BNNT dispersed therein, thereby producing micro- and/or nano fibers based polymeric piezoelectric composites.

A piezoelectric element having a vibrating section including a vibrating plate, a first electrode, a piezoelectric layer, and a second electrode, in which a crystal orientation of a piezoelectric material forming the piezoelectric layer is (100) and a crystal structure of the piezoelectric material is a tetragonal crystal, and a total thickness T.sub.1 of the vibrating plate and the first electrode and a total thickness T.sub.2 of the piezoelectric layer and the second electrode have a relationship of T.sub.1T.sub.2.