Wow! We have come out of a wonderful spring and summer of innovation.We just conducted an engineering test of the accuracy of our lowest-cost line of high-resolution sensors, the HRLV-MaxSonar-EZ. The two graphs show 1000 distance measurements each to a bar target at 500mm and 1000mm respectively.
The test demonstrates how accurately our sensors measure distance, and takes into account the part-to-part consistency, the full operating voltage range, and the reading-to-reading stability. The measured accuracy results speak for themselves. As CEO of MaxBotix Inc., I could not be more pleased with these test results.
A random sampling of 250 rangefinders were selected, (25 of each part number). For this test, the sensors measured the range to a 1” width 3′ long bar when powered at: 2.5V, 3.3V, 3.9V, and 5V. This resulted in 1000 range measurements for each distance. The mode of each range reading was recorded. The standard deviation of the reading-to-reading stability was 0.3mm to 0.7mm typically, and was always less than 1mm. (What this means in layman’s terms is that the sensor’s output never drifted more than three millimeters from the center reading, and typically was within one or two millimeters.) The modes were 500mm (exactly correct) and 1000mm (exactly correct). The means were 499.3mm (0.7mm low) and 1000.5mm (0.5mm high). The standard deviations were 2.3mm and 2.6mm respectively.
What Customers Say
In addition, our customers are noticing just how much better our new products are. Let me use two examples.
One company uses our product to continuously measure the distance to the ground on trucks moving at full highway speeds. While our 1cm resolution product, the MB7060, worked wonderfully, sometimes road noise was high enough to cause an occasional incorrect distance reading. Swapping out the MB7060 with our MB7360, eliminated all incorrect readings. Even though the millimeter resolution and temperature compensation was a plus, the greatly improved noise handling of this sensor made them a happy customer!
The next example is one system integrator testing our HRXL-MaxSonar-WR products for accuracy over temperature. They pleasantly discovered that in their setup, our sensor to sensor variation was generally less than two millimeters, and the reading-to-reading stability was better than plus or minus two millimeters. Only during fast temperature sweeps did they notice (and they expected this) that the thermal lag caused an offset of three to four millimeters, until the sensor and air stabilized at the new temperature. They recommend the evaluation of our HRXL-MaxSonar-WR to their full customer base.
Additionally, for the unmanned aerial vehicle (UAV) crowd, we introduced the I2CXL-MaxSonar-EZ lineup, allowing easy digital communication to multiple sensors. And for the users that desire side by side kiosk use (such as for HIPAA requirements), we have our ProxSonar line, where multiple sensors can operate together, sensing people reliably, without issue.
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