disynet presents an innovative acellerometer for Vibration measurement on curved surfaces

(PresseBox) ( Brüggen-Bracht, )
Measuring vibration of objects with curved surfaces such as car surfaces or airplane wings in a specific direction in space is not a simple task. Because the direction of the sensitive axis of standard accelerometers has a fixed relation to the surface (usually perpendicular to it), the sensitive direction of the sensor varies along the surface with respect to the direction of vibration.

The orientation of a multitude of accelerometers along the surface becomes a very challenging task: The orientation of the sensors must either be adapted to the curvature at the mounting positions using corresponding mounting adapters so that the direction of the sensitive axis is aligned with the direction of vibration, or it become necessary to use multiaxial sensors with orientation marks on them to determine the orientation of the sensor in space using optical systems, enabling the calculation of the resulting acceleration in the required direction..

The new innovative sensor system with can be rotated within its housing, including an orientation tool with indicates the orientation and can be used to rotate the sensor by 360°, not only saves a lot of time otherwise needed to set up the large matrix of sensors and to calculate the orientation but is also much less prone to systematic errors.

The sensor system 3494A1consists of four parts: First we have the ground isolated housing which is mounted on the surface with a hole for the insertion of the second part – a cylindrical accelerometer which is fixed using two M3 threads. This IEPE accelerometer has a sensitivity of 100mV/g is inserted into the housing and can be rotated by 360° to match the direction of vibration. A mounting tool – the third part - is provided for this purpose which can be attached to the sensor to turn it, and simultaneously can be used as a flag to indicate the direction of the sensitive axis. Lastly we have a cable with a Lemosa-connector which completes the system.

It is therefore possible to equip the entire object with a matrix of many 3494A1 sensors at the required locations and then use the attached mounting tool to set the orientation so that all sensors point in the required direction – all in one orientation process. Once this is completed, the mounting tool/orientation flag can be removed to reduce weight and to avoid resonances.

Further interesting features are the hermetically sealed design and the optionally available TEDS.

For further information visit our web site: www.sensors.de
For sensor know-how, visit our online sensor compendium www.sensoren.info (in German)
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