SICK IVP Ranger E/D - 3 Overview; Measuring with the Ranger

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Operating Instructions Chapter 3

Ranger E/D

Overview

3 Overview

3.1 Measuring with the Ranger

Each time the Ranger makes a measurement, it measures along a cross-section of the

object in front of it. The result of a measurement is a profile, containing one value for each

measured point along the cross-section – for example the height of the object along its

width.

For the Ranger to measure an entire object, the object (or the Ranger and illumination)

must be moved so that the Ranger can make a series of measurements along the object.

The result of such a measurement is a collection of profiles, where each profile contains

the measurement of a cross-section at a certain location along the transportation direc-

tion.

Figure 3.1 – Measuring the range of a cross-section of an object.

For some types of measurements, the Ranger will produce more than one profile when

measuring one cross-section. For example, certain types of range measurements will

result in one range profile and one intensity profile, where the intensity profile contains the

reflected intensity at each measured point.

In addition, the Ranger C and E models – being MultiScan cameras –can also make

parallel measurements on the object. This could for example be used for measuring

surface properties of the objects at the same time as the shape. If the Ranger is config-

ured for MulitScan measurements, the Ranger may produce a number of profiles each

time it makes one measurement – including multiple profiles from one cross-section of the

object, as well as profiles from parallel cross-sections.

In this manual, the term scan is sometimes used for the collection of measurements made

by the Ranger at one point in time.

Note that the range measurement values from the Ranger are not calibrated – that is:

 Range values (z coordinates) are given as row – or pixel – locations on the sensor.

 The location of a point along the cross-section (x coordinate) is given as a number

representing the column on the sensor in which the point was measured.

 The location of a point along the transport direction (y coordinate) is represented by for

example the sequence number of the measurement, or the encoder value for when the

scan was made.

Profiles

(range)

(width)

(transport)