APPLICATION NOTE: Laser Triangulation Sensors - MTI Instruments ...

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such that the curved surface does not skew the laser triangulation angle. Figure 8 shows the proper orientation for a system to reduce tilt effects. Figure 8: Note how the Laser Beam may be Deflected by Target Shape Care should also be taken to ensure the laser return light is not blocked by some feature on the target being measured. Figure 9 shows the right and wrong way to orientate a laser sensor. Figure 9: Note how the Laser Beam may be Obstructed by Target Features
iii.) Environmental Conditions Because laser triangulation systems are optical type sensors it is important to keep the optical path clean and free from obstructions or foreign materials. Dirt, dust and smoke can affect the measurement results or even render sensors completely useless. Care should be taken to eliminate such contamination and clean air purge systems should be used when required. If this type of system is not possible it is important to regularly clean the outer lenses to avoid problems. The most common environmental problem that can affect the accuracy of a laser sensor is temperature. Not only do the electronics exhibit temperature drift, but also expansion and contraction of mechanical components and fixturing can physically change the sensor gap. All of MTII’s Microtrak II sensors have a temperature stability of less than +/-0.05% of the full scale measurement range over a temperature change of 0 to 40ºC. iv.) Fixturing It is important that the fixture holding a laser triangulation sensor is stable. As mentioned above, temperature changes can cause expansion and contraction, resulting in a distance change to the target. Fixtures should be made of the appropriate material to minimize this effect. The fixture supports should also be as short as possible and long cantilevers should be avoided to minimize not only temperature issues but to also reduce vibration.
Page 1 and 2: Laser Triangulation Sensors 1) Intr
Page 3 and 4: Figure 3: Specular Laser Triangulat
Page 5 and 6: ange. Figure 5 shows the output of
Page 7: vi.) Spatial Resolution When taking
Page 11 and 12: Figure 10: Lead Position and Pitch
Page 13: thickness reading. This type of sys

APPLICATION NOTE: Laser Triangulation Sensors - MTI Instruments ...

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