![]() ![]() This characteristic enables piezo accelerometers to be used comfortably in applications where competing technologies would quickly fail. Temperature Stability - Piezoelectric sensors are intrinsically stable over wide temperature ranges. This means the performance of piezoelectric accelerometers over a broad frequency range is unsurpassed by other accelerometer technology currently on the market. After all, piezo sensors are used in applications ranging from sensing the low frequencies of a bass guitar to sensing and transmitting the high frequencies of an ultrasonic device. Piezo accelerometers offer a variety of benefits, including:įrequency Response - Piezoelectric sensors have a wide frequency response. In charge mode, the raw high-impedance voltage output(s) of the accelerometer are fed directly over a cable to the appropriate electronics or instrumentation. ![]() Without integral signal conditioning, piezoelectric sensors operate in charge mode. Some individuals prefer to use current loops as the output for noise resistance and fault detection - others may prefer voltage outputs with specified output impedances. Signal conditioning circuitry may include filters, amplifiers, limiters, clampers, or any other combination of analog and digital circuitry necessary to convert the raw accelerometer output to usable formats. It then converts it into a more convenient signal that’s more readily processed by instrumentation. Simply put, signal-conditioning circuitry receives the raw voltage output from the accelerometer’s piezo sensors. Piezoelectric accelerometers may or may not incorporate integrated signal-conditioning circuitry. Do you require a three-axis accelerometer that measures both linear and rotational acceleration components about each of the three axes (a total of six measurements)? At APC International, we have engineers who can advise you regarding the development of such hardware. Some applications may even require piezoelectric accelerometers to measure rotational acceleration about one or more axes. Likewise, a three-axis accelerometer would include three sets of masses and sensors oriented and calibrated appropriately. They are integrated into a single package. For instance, a two-axis piezoelectric accelerometer would include two sets of masses and piezo sensors placed along the desired axes of measurement. In this case, multiple masses and transducers are embedded into a single compact unit and form a multi-axis accelerometer. Many times, design requirements dictate that an accelerometer be capable of measuring acceleration components in multiple directions. In the case of a piezo accelerometer, the force is measured using an integrated piezo sensor. That way, the transducer can measure all force exerted on the mass due to acceleration. The basic operating principle of any accelerometer is that a mass of known quantity is suspended and constrained by a calibrated force-sensing transducer. ![]() Metaphors aside, what you may have been imagining is a crude and simple piezo accelerometer. This change in voltage reading corresponds to the shear force between the block and the box. ![]() In this case, if you decide to give the box a good shove, you might notice a change in the voltage reading. The corresponding wires are attached from the piezo plate to a multimeter. Now, suppose that the cement between the block and the inside surface of the box is replaced with a shear mode piezoelectric plate to sense the shear force. However, if that block was firmly cemented to the inside surface of the box, the block would never slide regardless of the rate of acceleration. This is because both the box and the concrete block have inertia and resist changes in their movement accordingly.Īs the box accelerates, the inside surface exerts a shear force against the surface of the concrete block thereby causing the block to move with the box - unless the shear force exceeds the maximum force allowable due to friction. If that person pushes and accelerates the box quickly enough, the concrete block inside the box might slide. Now, imagine that somebody gives that box a generous push. For illustrative purposes, imagine a wooden box with wheels and a concrete block inside. Contact APC Today Principles of OperationĪn accelerometer is a type of sensor that measures force due to acceleration of the sensor. No matter if you need to produce large volumes of customized piezo sensors, customized experimental devices in small quantities, or sensors for university and private research, it’s important to start with the right types of quality components. Choose from standard piezoelectric sensor component options, as well as customized solutions based on your specific needs. If you’re looking to build a piezoelectric accelerometer that suits your specific needs and specifications, precision-manufactured piezoelectric accelerometer components can help. ![]()
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