ZN-F3201 piezoelectric triaxial force sensor

ZN-F3201 piezoelectric triaxial force sensor

working principle

• Core physical effectsBased on certain materials such as quartz, piezoelectric ceramic PZT, and piezoelectric polymer PVDFPositive piezoelectric effectWhen external force is applied to the sensor, the sensitive element undergoes microscopic deformation due to the force, and its interior undergoes polarization, generating positive and negative charges on both surfaces, thereby converting mechanical force into electrical signals (charges or voltages) for output.

• Force decomposition and measurement mechanismIn order to simultaneously measure three force components (Fx, Fy, Fz) in space, sensors usually adopt special structural designs internally, which are mainly divided into two categories:

• stackableStack multiple groups of piezoelectric elements together. One group uses the piezoelectric effect in the thickness direction to measure the normal force (Fz), while the other two groups use the thickness shear effect with directions perpendicular to each other to measure the shear forces (Fx, Fy) in both directions.

• distributedCombining four symmetrically arranged piezoelectric elements (such as flat plate or micro column arrays) with a force transmission structure (such as a truncated pyramid shaped force transmission head). When subjected to a triaxial force, the normal force (Fz) causes four units to generate charges of the same polarity and magnitude, while the shear force (Fx/Fy) causes one unit to be pulled and the other unit to be compressed, generating charges of opposite polarity. By calculating the sum and difference of the output charges of the four units, the forces in three directions can be decoupled.

• Signal output type：

• Charge type (PE)Directly outputting charge signals requires an external charge amplifier to convert them into voltage signals. This type of sensor is suitable for harsh environments such as high temperatures.

• Voltage type (IEPE)The sensor integrates microelectronic circuits internally, which can directly output voltage signals, making it more convenient to use.

• Key performance characteristics：

• High dynamic responseHigh natural frequency (up to 50kHz or above), very suitable for measuring transient impact forces, high-frequency vibrations, and dynamic forces.

• High stiffness and high stabilityPiezoelectric materials themselves have high stiffness and minimal deformation under stress, resulting in good linearity and stability of sensors with small hysteresis errors.

• Wide environmental adaptabilityThe working temperature range is extremely wide (such as -200 ° C to+400 ° C), and it is resistant to radiation and electromagnetic interference, and can adapt to various harsh working conditions.

• Static measurement limitationsTraditional piezoelectric sensors suffer from charge leakage and are generally unable to measure true static forces. However, through special design (such as using PZT material and utilizing specific modes), quasi-static force measurement can also be achieved.

• Main application areas

• ZN-F3201 piezoelectric triaxial force sensor

• Aerospace and Defense：

• wind tunnel testMeasure the aerodynamic forces and moments experienced by the aircraft model in the airflow.

• Rocket engine testingReal time monitoring of engine thrust vibration and impact force.

• Structural dynamic analysisUsed for impact and vibration testing of aircraft components.

• Industrial Automation and Manufacturing：

• Measurement of Cutting and Grinding ForcesReal time monitoring of cutting forces during the machining process on the machine tool is used to optimize process parameters and monitor tool wear.

• precision assemblyEnsure assembly force of 0.01N level on the assembly line of small components such as mobile phone lenses and precision bearings to ensure product quality.

• Stamping and forging inspectionMeasure the normal pressure and friction on the surface of the mold during the metal forming process to help optimize mold design.

  Automobiles and Collision Safety：

• crash testInstalled on collision dummies or vehicle bodies, capturing multidimensional dynamic forces at the moment of collision and providing data for vehicle safety design.

• Dynamic force measurementUsed to measure the impact, vibration, and thrust of automotive components.

• Research and Others：

• Tactile sensing arrayA flexible sensor array made of flexible piezoelectric materials (such as PVDF) can be attached to curved surfaces and used for studying robot touch, wearable electronic devices, etc.

• Research on Materials MechanicsUsed to test the mechanical properties of materials under dynamic loads.