A package having a recessed section, a sensor element arranged in the recessed section and having a piezoelectric material, a lid joined to the package and sealing the recessed section of the package are provided. The package has a first hollow portion which a part of the sensor element fits with, on an inner bottom surface of the recessed section. The lid has a second hollow portion which a part of the sensor element fits with.

A surgical scalpel handle with an internal chamber and a removable electromagnetic resonance signal generating cartridge and an electromagnetic resonance sensor system is disclosed. A surgical scalpel handle is provided for with an internal chamber comprised of two pieces, a front piece with a blade holder and a back piece and when attached, the front end section and the back end section together comprise an internal cavity. An electromagnetic resonance signal generating cartridge comprising one or more printed circuit boards (PCB) are in electrical contact upon which an application specific integrated circuit (ASIC) are mounted and having a magnet; a coil; and capacitor resonant circuit; an elastic member; a pressure sensitive feature; and having power source connections, and a removable power source having power source contacts; and power source connections complete the electrical contact between the electromagnetic signal generating cartridge and the removable power source housed in the internal cavity. An electromagnetic signal generating cartridge is disposed of in an internal cavity of a scalpel handle and generates an electromagnetic resonance signal. An electromagnetic sensor system apparatus with a sensor system disposed of vertical and horizontal planes is disclosed and is disposed of on a surgical table. The scalpel handle with an internal cavity and removable signal generating cartridge and with the electromagnetic sensor system apparatus with a sensor system can be used to digitally map the precise position, size, trajectory, shape, pressure and angle of the scalpel being used during surgical procedures. A pressure sensitive feature is disposed and in connection with the blade holder and the removable signal generating cartridge. The pressure exerted by a surgeon on the blade is transmitted through a blade holder to a pressure sensitive feature to switch from the stand by position of the cartridge to the on and generate an electromagnetic signal position. The emitted signals generated by the cartridge can be read by the provided for electromagnetic resonance sensor system to generate a digital record of coordinates in the x, y location in a horizontal plane and vertical plane as well as a digital record of trajectory of scalpel used during the procedure. The coordinates are stored in a memory device such as a RAM, tablet or computer. After communicating with a host machine, a monitor can display the surgeon's trace and exact location coordinates.

A package having a recessed section, a sensor element arranged in the recessed section and having a piezoelectric material, a lid joined to the package and sealing the recessed section of the package are provided. The package has a first hollow portion which a part of the sensor element fits with, on an inner bottom surface of the recessed section. The lid has a second hollow portion which a part of the sensor element fits with.

A piezoelectric sensor is fixed to a detection object and detects distortion of the detection object includes first and second principal surfaces, and extends in the lengthwise direction. The piezoelectric sensor includes a piezoelectric body whose polarization axis extends in a direction parallel or substantially parallel to the lengthwise direction, and first and second detecting electrodes that are provided on a surface of the piezoelectric body and that extend in a direction parallel or substantially parallel to the lengthwise direction. Distortion of the detection object is detected based on electric output corresponding to shear stress of the piezoelectric body.

A method of determining the center of loading of a rolling element includes providing a rolling element body and at least three load sensors. The sensors are each positioned within a bore of the rolling element body at a separate distance from a reference position. Load measurements are taken with each one of the sensors at various positions about the circumference of the bearing and the center of loading is calculated at each one of the positions to determine the variation in axial loading about the bearing circumference.

A pressure sensor apparatus is provided. The pressure sensor apparatus includes a bottom plate, a pressing interface opposite to the bottom plate, elastic connectors disposed between the bottom plate and the pressing interface and connecting the bottom plate and the pressing interface, a piezoelectric sheet, a drive member abutted against the piezoelectric sheet and the pressing interface and a processor module. When the pressing interface is pressed, the compression elastic connectors can be deformed; the drive member can transmit the deformation to the piezoelectric sheet so that the piezoelectric sheet can be deformed and then output an electrical signal, and the processor module can calculate the degree of the pressing force exerted onto the pressing interface based on the electrical signal outputted by the piezoelectric sheet and choose corresponding programs based on the association relationship information between the predefined degree of pressing force and the programs.

A pressure sensor for sensing pressure of a fluid includes a diaphragm flexure and a crystal retaining flexure. The diaphragm flexure is designed to exert imparted force on the crystal retaining flexure. The imparted force is proportional to fluid pressure exerted on the diaphragm flexure. The pressure sensor further includes a resonator having opposing curved end portions connected to each other by a bridge section. A portion of the crystal retaining flexure is positioned between the diaphragm flexure and the resonator. The crystal retaining flexure is designed to exert a load on the resonator. The load results from the imparted force exerted on the crystal retaining flexure by the diaphragm flexure.

A surgical scalpel handle with an internal chamber and a removable electromagnetic resonance signal generating cartridge and an electromagnetic resonance sensor system is disclosed. A surgical scalpel handle is provided for with an internal chamber comprised of two pieces, a front piece with a blade holder and a back piece and when attached, the front end section and the back end section together comprise an internal cavity. An electromagnetic resonance signal generating cartridge comprising one or more printed circuit boards (PCB) are in electrical contact upon which an application specific integrated circuit (ASIC) are mounted and having a magnet; a coil; and capacitor resonant circuit; an elastic member; a pressure sensitive feature; and having power source connections, and a removable power source having power source contacts; and power source connections complete the electrical contact between the electromagnetic signal generating cartridge and the removable power source housed in the internal cavity. An electromagnetic signal generating cartridge is disposed of in an internal cavity of a scalpel handle and generates an electromagnetic resonance signal. An electromagnetic sensor system apparatus with a sensor system disposed of vertical and horizontal planes is disclosed and is disposed of on a surgical table. The scalpel handle with an internal cavity and removable signal generating cartridge and with the electromagnetic sensor system apparatus with a sensor system can be used to digitally map the precise position, size, trajectory, shape, pressure and angle of the scalpel being used during surgical procedures. A pressure sensitive feature is disposed and in connection with the blade holder and the removable signal generating cartridge. The pressure exerted by a surgeon on the blade is transmitted through a blade holder to a pressure sensitive feature to switch from the stand by position of the cartridge to the on and generate an electromagnetic signal position. The emitted signals generated by the cartridge can be read by the provided for electromagnetic resonance sensor system to generate a digital record of coordinates in the x, y location in a horizontal plane and vertical plane as well as a digital record of trajectory of scalpel used during the procedure. The coordinates are stored in a memory device such as a RAM, tablet or computer. After communicating with a host machine, a monitor can display the surgeon's trace and exact location coordinates.

A remote tension measurement system and method of use is provided for detection and estimation of tension in two-dimensional and three-dimensional inflatable structures. Given a spacing distance and a known mass of the membrane-formed structure, measurement points are determined to define a measurement region of the structure. A non-invasive sensor monitors the measurement points to detect a transverse wave moving along the measurement region at an angle to a straight path between measurement points. Propagation speed for the transverse wave is calculated and tension for the measurement region is deduced from the calculation. The solution exploits either proactively introduced, pre-existing, induced by normal environmental conditions) and/or multiple transverse vibrations in the membrane-formed structure. Propagation speed is calculated deterministically based on an analysis of the arrays of measurement points.

An apparatus includes a first acoustic sensing resonator formed from a silicon substrate and has a first microelectromechanical system. The apparatus also includes a second acoustic sensing resonator formed from the silicon substrate and has a second microelectromechanical system. The second acoustic sensing resonator is arranged on the silicon substrate at a ninety degree (90) angle with respect to the first acoustic sensing resonator and together the first acoustic sensing resonator and second acoustic sensing resonator form a torque sensor. A high temperature bonding surface is connected to the torque sensor for directly connecting the torque sensor to a metal object.