How can I set filters for my measurements with ultrasonic sensors?

An overview of the different filter settings for microsonic ultrasonic sensors.

Each application requires a custom sensor and in some cases a sensor needs a filter to perform optimally . In this article we answer a number of important questions: which filters are there? How can I set these filters? And how do these filters work? Read on and find out which filters there are for the ultrasonic sensors from microsonic. 

F00 - No filter activated

Every distance measurement is done unfiltered when the no filter setting is applied. This setting is preferrably used in measurements that are performed in laboratory environments. It is not recommended for industrial use.

F01 - Standard filter

With this filter it is possible to filter the measurements. By changing the hold-time of a rapidly changing value, or even completely turning it off, it is possible to determine which peak values can be accepted as a real measurement. This filter is the best choice for most industrial applications.

Filters instellen: Het meest gebruikte standaardfilter voor ultrasoon sensoren

F02 - Averaging filter

This filter setting is the standard for analog ultrasonic sensors to smooth the change in distance. This filter can be applied in applications that have to deal with vibrations that can be seen in the measurements by flattening these. The output values remain stable this way. Thus, peak values will only occur when these surpass the vibrations of the applications significantly.

Middelend filter instellen voor ultrasoon sensoren

F03 - Foreground filter

The sensor will have a delayed response with this filter during fast changes in distance. Preferrably, the most near objects will be detected. An example of this is the spraying arm on an agricultural vehicle. It is necessary that the background object, the ground in this case, is ignored. Because of this, the object on the foreground, in this case the vegetation, can be detected and measured.

Voorgrond filter instellen voor ultrasoon sensoren om objecten op de achtergrond te negeren

F04 - Background filter

This filter makes the sensor have a response delay in rapid changes in proximity, preferrably objects that are further away will be detected. An example of such an application is a fan in front of an object that has to be ignored. This settings makes it possible to ignore the fan in detections and measurements.

Achtergrond filter instellen voor ultrasoon sensoren
Filter
Application
F00
No filter
Only for research, not recommended for industrial applications
F01
Standard filter
Recommended filter for most industral applications
F02
Averaging filter
Common averaging filter for analog sensors to create a stable output value
F03
Foreground filter
Special filter to detect nearby objects and ignore the background
F04
Background filter
Special filter to detect further objects and ignore the foreground

What suits your application best?

Which sensor supports which filter? In the table below it can be seen which microsonic sensor series supports which filters:

F01
F02
F03
F04
mic+
mic
crm+
hps+
pico+
lcs-
lcs+

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