Operation Principle - HOKUYO AUTOMATIC UST-05LN User Manual

3.3 Operation principle

270°
0°
Figure 3-4 shows the scanning range of the UST. The sensor emits pulsed laser beams which reflect on a
rotating mirror forming a fan-like scanning pattern over 270 ° field.
Maximum detection range is 5m for white Kent sheet. Detection range for objects of 10% diffused
reflectance is 2m.
User can configure output regions 1, 2, and 3 by using the Area Designer application. When the sensor
detects an object in the configured area, corresponding outputs are switched to OFF state.
When the emitted laser beams are reflected back from an object, its distance is measured by applying the
Time-of-Flight (TOF) principle. The duration of the reflected pulsed laser beam is taken for distance
calculation as shown below.
Where, L＝Distance of the object
C＝Speed of the light
T＝Time difference
10
UST
Figure 3-4 Scanning range
Document No: C-41-02490-9
Output region 3
Output region 2
Output region 1