Displacement Measurement

This Mode is only available for the OndoSense apex Pxxx

The High Precision displacement measurement allows for the measurement of distance changes with a resolution as fine as 1 µm. When this mode is activated, the current distance to the target is stored as the reference distance, serving as the baseline or zero point. Any subsequent change in distance is measured relative to this reference. If the distance to the target increases, the output values will be positive. If the distance decreases, the output values will be negative.

Common Use Cases:

1. Displacement & Drift Measurements over Time:

   • Displacement measurement can be used to monitor the position of objects over extended periods, such as tracking the temperature drift of equipment.

2. Profile Measurement:

   • This mode is also ideal for measuring the profile of surfaces by moving the object perpendicular to the radar beam. This displacement measurement can effectively measure the profile of rough surfaces due to the opening angle and the radar spot size over which the distance is averaged.

Click Set Reference to define the current distance as the new zero point.

Reset Time after Target Loss defines how long the sensor waits after a lost target before the sensor resets a new reference point automatically. When it resets, the baseline is updated to the current distance.

Limitations

• The displacement measurement is optimized for movements up to 50 mm/s. Target loss events may occur at higher speeds.

• The displacement measurement does not give a more accurate absolute distance than the normal absolute distance measurement. The first absolute distance measurement already has an error of a few hundred micrometers, and this error cannot be removed by the displacement measurement.

• The displacement measurement will measure accurate distances for targets whose orientation stays constant. For significant changes of the incident angle to the target, the accuracy of the displacement measurement will be affected.

• The displacement measurement can not be read out by the current loop or switching outputs.