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2-LASER Triple-Check System

2-LASER Triple-Check System. Engineering-Design 100, Section 10 Group 2 Xinli Wu The Pennsylvania State University. Matt Brady James Gallo Jon Lesner Alex Quehl. The Problem. Need for a more accurate velocity measurement allows for: Higher-quality picture (micron tolerances)

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2-LASER Triple-Check System

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  1. 2-LASER Triple-Check System Engineering-Design 100, Section 10 Group 2 Xinli Wu The Pennsylvania State University Matt Brady James Gallo Jon Lesner Alex Quehl

  2. The Problem • Need for a more accurate velocity measurement allows for: • Higher-quality picture (micron tolerances) • Better handling of paper while being printed • Due to wear and tear, centripetal velocity of rollers changes as time progresses • Without accurate velocity, distorted picture is likely

  3. The Solution • Design measuring paper velocity • Measures velocity 3 times: • Time beam of laser 1 is blocked from sensor 1 • Time beam of laser 2 is blocked from sensor 2 • Time between lasers • Paper length and distance between lasers are both constant • Time /distance = velocity • Finds the mean of all 3, minimizing chance for a flawed calculation

  4. The Prototype • 2 rollers in front • 2 rollers in back • 2 lasers located between front and back rollers • Fixed distance is needed to find velocity • Sensor corresponding to each laser • Baffle to guide the paper • Framing

  5. Example • Internal clock able to measure to the millisecond • First, it takes 4 time measurements, then calculates 3 velocities, using d /∆t (distance / change in time), where: • d1 = d2 = 279.4 mm (i.e., length of paper) • d3 = 63.5 mm (i.e., distance between sensors) • ∆t1 = tb – ta • ∆t2 = td – tc • ∆t3 = tc - ta

  6. Example (Cont.)

  7. Conclusion • Optimal accuracy, considering the relatively small number of resources used • Eliminates the risk that comes with taking just one measurement • Ideal for a printer with such a great need for super-precise calculations

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