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Unformatted text preview: In addition to its ability to read analog voltages from the LabJack , Matlab can also set the output voltage of digital ports. We will use this capability to control the rotary motion of optical components to test Snell’s Law of Refraction. In addition to the laser and photodiode from Lab 0, we will use: • A stepper motor and controller which converts logic pulses from the LabJack into discrete rotary motion. In other words, depending on the stepper controller settings, a single logic pulse from the LabJack will cause the motor shaft to turn 1/400, 1/1000, 1/2000, or 1/10 4 rotation. • A translation stage which converts rotary motion into linear motion with a 0.25mm-pitch lead screw. Place the motor between the laser and photodetector (mounted on the translation stage) so that the rotor is vertical and the sample stage is installed. Close the aperture until the voltage signal is within the measurement range when you align the laser into the detector....
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- Spring '11
- Physics, Angle of Incidence, Snell's Law, Total internal reflection, motor shaft, translation stage