Graphic Explanation
Number of Pulses
The most comprehensible modifiable value is the length of the transmitted acoustic signal. Due to the resonance of the
transducer, longer signals equal a higher power for the transmission signal. This directly impacts the maximum detection distance
of the system. Longer pulses with higher amplitude can result in lower accuracy.
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Number of Pulses
Command
sPuls
Effect
Sets number of ultrasonic pulses emitted by the piezo transducer in every transmission cycle. Increasing the
value will allow the detection of objects that are further away, decreasing it will increase the quality of
detections in close range
Parameter
5-digit unsigned integer representing the number of pulses to be sent out
Applicable Values
Default = 8, min. = 0, max. = 20
Example
CsPuls00010\r
for 10 pulses
The transmission signal length influences the maximum detection distance, the returned signal strength and the selectivity. Longer
signals carry more power but also fuse smaller object in close proximity to the sensor.
To visually demonstrate the influence of the parameters, the following substitute graphic is used. The red arrow indicates the
sensor position and heading, while the red dots show the actual object positions (e.g. pole or sphere in this case). The size of the
red circles indicate the size of the real objects while the grey circles indicate the sensors perception of the acoustic reflection. Less
visible, brighter colored circles indicate less
“loud”
echoes. In the following explanations, a single parameter is changed at a time.
Short (1-3) = Low Amplitude/Length Signal
Medium (4-7) = Medium Amplitude/Length Signal
Large (8-20) = Large Amplitude/Length Signal
Short signals result in better discrimination
properties
regarding
close
ranged
detection of objects. Objects in a further
distance
can’t
be detected if the reflected
energy is lower than the configured
threshold.
Medium signals are the best all round fit
for most use cases. Objects at a further
distance have a chance of being detected,
while close objects can still be recognized
as separate ones.
Large signals enable the recognition of
objects farther away from the sensor.
Please note the “fusion” of close ranged
objects due to the loud and long
transmission pulse. This effect can’t be
compensated for by other parameters.
The size of the circles indicates the
detected position of the echo. Bigger
circles indicate less accuracy while
the brightness indicates echo signal
integrity.
If the circles are fusing, this indicated
possible echo interference which
results in inaccurate detection.