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::: Applications :::
People detection
If the task is to detect the presence of persons, you are recommended to
choose a ultrasonic sensor with an operating range well in excess of the
required scanning distance. The greater the operating range of a sensor,
the lower is its ultrasonic frequency. And the lower the ultrasonic
frequency, the easier it is to detect absorbent clothing materials such as
wool.
Positioning
When scanning panes of glass or other smooth, flat surfaces, care should
be taken to ensure that the ultrasonic sensor scans perpendicular to the
surface.
Height and width measurements
By using several mic+ ultrasonic sensors or pico+ ultrasonic sensors,
three-dimensional scanning of any size box can be made. There are
sensors with different detection ranges available.
Level control
Detection of filling levels from just a few millimetres up to 8 m can be
made. Ultrasonic sensors with one or two switched outputs for
minimum/maximum control, or with 0-10 V and 4-20 mA analogue output
are available. Chemical resistant versions are also available with crm+
or hps+ ultrasonic sensors.
Loop control
In this case an ultrasonic sensor with analogue output scans from above
into the loop and adjusts the material feed depending on the depth of
the loop. If a loop of material tends to swing sideways, the sound waves
are very easily deflected away when scanning from above. In such cases it
is recommended to scan the loop from below, as shown in the diagram.
Monitoring of trays
A solution with the sensor operating as a two-way or reflective barrier
should always be preferred when the object to be scanned absorbs the
sound waves or, due to its shape or position in the tray, deflects the
sound waves away. In this situation an additional reflector is positioned
behind the actual object to be scanned. An ultrasonic sensor with
switched output and operating in window mode emits a signal as soon as
the object obscures the reflector.