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|     Written By: Scott Wielenberg     |     Date Posted: 02-14-2013     |
MB7360 Multi-Sensor Testing

MaxBotix Inc., has recently tested operation of our MB7360 HRXL‑MaxSonar‑WR in a multi-sensor environment. The testing was conducted from 11/15/2012 to 11/19/2012.

Test Setup

The following presents the test data from a four day, three sensor test to verify multi­sensor operation for the MB7360 ultrasonic

sensor. The sensors tested were the MB7360 in free run mode with data captured using the RS232 serial output by a Serial to USB converters. A terminal program was used to capture the data into a text file.

Copies of the text files are provided at the bottom of this article. The text files that are available are not synchronized. The only modification to the text files was the removal of the ASCII character “R” for plotting purposes.

The graphic below is a representation of the layout for the multi-sensor test.
Set Up representation for layout
*Corrugated steel introduced some error in the mm range accuracy as the sensor cycled in the outdoor temperatures (Photos 1 and 3 show a clear definition of the corrugated steel ceiling)
**The test area was an earth floor (Pictures 1, 2, and 3) so the exact distance to the ceiling varied slightly from sensor to sensor.

Multi-Sensor Test Setup Photo's

Set Up 1 length of test Set Up 2 width of test
Set Up 3 another view of test Set Up 4 sensor picture

MB7360 Multi-Sensor Test Results

Sensor 1 Results

Sensor 1 Results screenshot

Sensor 2 Results

Sensor 2 Results screenshot

Please note the slight drop in the data was a real detection point. The sensor detected the technician when taking photo 4.

The drop in data had 9 range readings in the following sequence: 0676, 0677, 0678, 0680, 0680, 0680, 0681, 0681, and 0681. Like stated this was a valid range reading, not only because the range readings where at the same distance, but because the sensor was reporting the range to hat the technican was wearing when taking photo 4.


Sensor 3 Results

Sensor 3 Results screenshot

During setup the sensor was wired and handled in a room at 64 degrees Fahrenheit and then brought into an unheated room. This handling of the sensor during the test setup, caused the drift in the reported range. This drift occurred because the internal temperature sensor was warmer then the air temperature. As a result, it took about 36 minutes for the sensor's internal temperature to match the air temperature.


Multi-Sensor Test Summary

All the test data (about 7.5mil. data points) gathered show there to be no interference from multi-sensor operation for the MB7360 in this test setup.

MaxBotix Inc., has presented test data and concludes that there will be little to no interference from MB7360 multi‑sensor operation in the application described to MaxBotix.

It is still recommended that the customer tests multi‑sensor operation in their application prior to full integration however, MaxBotix Inc., doesn’t foresee multi‑sensor operation to be an issue with the MB7360 based on our test results.


Test Data File Downloads

MB7360 Sensor 1 Data
MB7360 Sensor 2 Data
MB7360 Sensor 3 Data

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