LTI Laser Sensor Measurement Discrimination

by TGirmann 4. November 2013 10:18

Why Target discrimination measurement mode is essential for distance measurement.


When considering the best laser sensor for a non-contact distance measurement application it is important to consider if the sensor has target discrimination. Not all laser measurement sensors are created equal in this respect. LTI laser sensors offer a number of discrimination modes including First, Last, and Last Two, among others.

This measurement method is essential for accurate and reliable distance measurement and is achieved by the way the sensor handles measurements. Simply stated, when a laser sensor is measuring, a collection of these measurements are analyzed and compared. If Last Target is selected, the farthest of all of the readings is output as the reading. An example of using Last Target mode is measuring through dust to a solid material where the goal is to measure past the dust to the material surface.

An application where First Target mode would be best is a water surface level measurement where the desired measurement is the water surface and not beyond. In this example, we can assume that some of the laser pulses penetrate below the water surface and are returned. The sensor will then compare these longer measurements with the readings off of the surface of the water and output the shorter reading, or the distance to the water surface.

Other measurement modes are available including Averaging mode to optimize accuracy. Each measurement method selected depends on many factors including target integrity, ambient conditions, and accuracy among others.

Learn more about Laser Technology laser sensors. Then call us at 800-OWN-A-LTI or email us -- we will be happy to give you a practical hands-on demonstration.

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