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Accelerometer Acceleration Measurement

Sinocera Piezotronics, INC | Updated: Sep 04, 2017

Accelerometer Acceleration measurement

Accelerometer instrument for measuring acceleration. Acceleration measurement is an important topic of engineering technology. When the object has a great acceleration, the object and its equipment and other objects without relative acceleration are able to produce the same large acceleration force, that is subject to dynamic load. To know the dynamic load is necessary to measure the acceleration. Secondly, to know the instantaneous aircraft, rockets and ships where the space position, through inertial navigation (see gyro platform inertial navigation system) continuously measured its acceleration, and then through the integral operation to obtain the speed component, once again to get a direction of the position Coordinate signal, and three coordinate direction of the instrument measurement results to integrate the motion curve and give the moment where the aircraft where the space. Again, in some control systems, the acceleration signal is often required as part of the information needed to produce a control, and there is a problem of continuously measuring the acceleration. An apparatus that continuously gives an acceleration signal is called an acceleration sensor.

Common accelerometer components are as follows: shell (with the measured object fixed), reference quality, sensitive components, signal output and so on. Accelerometers require a range and accuracy, sensitivity, etc. These requirements are often contradictory to some extent. The accelerometers based on different principles have different ranges (from several g to several hundred g), and their sensitivity to the abrupt acceleration frequency is also different. The common accelerometer is based on the principle that: ① the reference mass is connected by the spring to the housing (see figure). The relative displacement of the shell and the shell reflects the magnitude of the acceleration component. This signal is output by the potentiometer in voltage; The mass is fixed by the elastic rod and the shell, the dynamic load caused by the acceleration deformation of the rod, with the strain resistance wire induction deformation of the size, the output is proportional to the size of the acceleration disk size of the signal; ③ reference quality through the piezoelectric element And the load is fixed to the shell, the mass of the dynamic load on the piezoelectric element pressure, the piezoelectric component output and pressure that is proportional to the acceleration component of the electrical signal: ④ reference mass connected by the spring and the shell, placed inside the coil, reflecting the acceleration component The size of the displacement changes the inductance of the coil, thereby outputting an electrical signal proportional to the acceleration. In addition, there are servo type accelerometers, which introduce a feedback loop to improve the accuracy of the measurement. In order to measure the acceleration vector in plane or space, two or three accelerometers are required, each measuring an acceleration component.

The principle of the angular accelerometer is similar to that of an accelerometer whose box is mounted on a rotating object and produces a signal proportional to tangential acceleration or angular acceleration due to angular acceleration and a tangential dynamic load at the reference mass. With the measured moving objects and measurement requirements of different, accelerometer has a variety of principles and ways to achieve. Such as in the aircraft, according to the principle of gyroscope designed gyro accelerometer and so on.