#piezo elements

Piezoelectricity, the property of certain materials to generate an electric charge in response to mechanical stress, is at the core of piezo elements. These elements are renowned for their ability to convert electrical energy into mechanical energy and vice versa with exceptional precision. While standard piezo components have their applications, the true magic lies in the realm of customization.

Noise is based on total capacitance divided by feedback capacitance. Everything being equal, the noise floor of charge sensors with built-in electronics will be lower than with anĮxternal charge amplifier. Coupling the piezo-ceramics with low noise J-FET internal amplifiers provides outstanding resolution with noise floorsĪs low as those found on charge accelerometers coupled to typical cable lengths connected to a laboratory grade charge amplifier. Polycrystalline elements can be made into a variety of shapes/geometries) and the high charge amplified output. When it comes to ceramic piezoelectric sensing materials the key benefits are in the controllable polarization process, (ie Dynamic Pressure in active environments like turbine combustion instability and airflow in wind tunnels over airfoils.Dynamic Force sensors of single and triaxial configuration.Many thermal active and cycled environments like Cryogenic, as well Environmental Stress Screening (ESS) / Highly Accelerated Life Test (HALT) / Highly Accelerated Stress Screen (HASS).Dynamic Calibration reference standards due to outstanding long term stability.Quartz sensing elements find outstanding applications in the following: Final limitations in quartz are centered about limited cuts and geometry for natural polarization, ie no annular shear quartz. The noise can also be slightly higher due the fact that the resistors used to set timeĬonstant are normally larger than in charge amplified systems. Sometime there is also a slightly higher noise floor in voltage operationĭue to the MosFET amplifier used for internal impedance conversion having a higher noise floor than the typical internal charge converting J-FET amplifier. Most often quartz is not run at higher temperatures because there are other piezoelectric ceramic materials that are more appropriate due to their higher charge output. This high output is, in fact, why most dynamic quartz force sensors are actually attenuated from their open circuit sensitivity (over a 1.3 volt/lb The low capacitance of quartz gives it a high voltage output (V=Q/C). Quartz exhibits no pyro-electric output and has a small stable As such, it exhibits the best long term stability of any piezoelectric sensing material. This month we’ll review the benefits of each, along with citing theĬertain applications where either one or the other excels.pun?įirst off, Quartz has long been recognized for its benefit of being naturally piezoelectric. Over the years there has been a great deal of discussion over the merits of selecting either quartz or ceramic as the sensing element for a piezoelectric accelerometer.

New Post has been published on http://engineer.city/robust-switch-for-potentially-explosive-atmospheres/

Robust switch for potentially explosive atmospheres

SCHURTER develops and manufactures switch and pushbutton technologies including microswitches, piezo elements, switches with mechanical actuation, metal pushbuttons and keypads as well as display elements.

Certified according to ATEX/IECEX approvals, the PSE EX family is suitable for use in a potentially explosive atmosphere containing air gases and dust.

The Device Directive, 94/9/EC for Products and Protective Systems, was developed to protect equipment and personnel endangered by the ignition of gases, vapours, or dust that could lead to an explosion. This protection is achieved by the prevention of all possible sources of fire and ignition.

These switches certified for use in hazardous areas are available in 19 and 22 mm diameters and are labelled with the approval information and an identification number. The PSE EX standard versions are deliverable with 16, 19 and 22 mm mounting diameters with pin connections. The housing is available in red, green or natural aluminium. Additional colours, mounting diameters and connections are obtainable upon request.

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