NON-CONTACT MEASUREMENT OF DISPLACEMENT

LAP offers various laser sensors for displacement measurement.

Depending on the situation, there are several ways to measure displacement or distances. In the application examples listed below, we will show you, which manner makes sense for a certain task. The most important fact for the selection of a sensor is the measurement range, meaning the difference between smallest and largest displacement (not the absolute distance).

Second important point is the arrangement of the objects to be measured. Linear displacement can be measured with a triangulation sensor, for gaps between objects you may use a laser micrometer.

In case you don't find the application sketch you need, please ask us!

The animation shows the principles of displacement measurement and triangulation.

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NON-CONTACT MEASUREMENT OF POSITION

For position measurement you need at least one sensor for each axis.

The simplest position measurement is the distance in direction of one room axis. For objects with straight sides you may use triangulation sensors. To get a defined edge direction, you need at least two sensors.

Round objects are detected with laser scanners or light section sensors. To measure the position on a plane you use two sensors in an angle of 90. 

More complex objects can be detected by camera systems with shape reconnaissance. These systems may reach their limits on large objects or high precision requirements.

NON-CONTACT MEASUREMENT OF DEFLECTION

Measurement of deflection most of the times happens on a mechanical part transmitting the movement of another object. 

Even quantities that cannot be reached by laser sensors directly may be measured this way. You may e.g. measure the distance to a transparent object by measuring the deflection of a roller. 

NON-CONTACT MEASUREMENT OF BOW

Measurement of bow may take place at one or several measurement locations. 

Depending on the object geometry as well as the number and position of sensors, you get a straightness or a flatness measurement.

NON-CONTACT MEASUREMENT OF STROKE OR WAY

Stroke or way measurement is often found on machines, transport tools or cranes. 

The selection of the sensor depends on the measurement range. Very short ways (< 30 mm) may be measured by laser scanners, short ways (30 mm < x < 1000 mm) by triangulation sensors

Some applications up to 4 m need the high measurement speed of long range triangulation sensors. For larger distances (> 4 m) you may use time-of-flight systems.

NON-CONTACT MEASUREMENT OF SAG

You find sag measurement in processes, that need to control speed or stress of transported material.

A buffer, e.g. a loop, is used to compensate variation in the feed system. If the loop exceeds an upper or lower limit, process speed or feed parameters have to be adjusted.

NON-CONTACT LEVEL MEASUREMENT

Levels can be measured on liquids or granular material.

LAP sensors cannot measure transparent objects, neither solid nor liquid. Metal melting and solid-color plastics should work fine. For protection, the sensors may be equipped with air purge housings, heat shields or even water cooling.

If you need to measure on hot or molten metal, ANTARIS sensors are first choice.

NON-CONTACT MEASUREMENT OF CONCENTRICITY

For measurement of concentricity you may use laser triangulation sensors or laser micrometers.

Triangulation sensors habe to be adjusted to point exactly perpendicular to the turning axis. Laser micrometer have to measure perpendicular to the surface. If the alignment of the sensors doesn't fit, you may encounter geometrical errors.

NON-CONTACT MEASUREMENT OF WOBBLE

Measurement applications for wobble have to be planned carefully.

Special attention has to be given to movement directions and frequency. For fast movements, sensors of ATLAS series with 10 kHz measurement frequency may be appropriate.

NON-CONTACT MEASUREMENT OF GAP WIDTH

To directly measure gap width, the gap has to be accessible from both sides.

Measurement through a gap can be done with METIS laser scan micrometers or laser light section sensors. If only one side is accessible, line cameras may be a solution. 

NON-CONTACT MEASUREMENT OF SEVERAL GAPS

Multi gap measurement is e.g. used for control of electronic chips.

To detect presence and position of connectors, a complete side of the chip is checked. Malformed or missing pins generate warnings or cause the segregation of the part. This task is typical for laser micrometers