6. A shiny wheel is marked with alternating radial strips of black plastic dividing the wheel into equal sections A laser beam falls at an angle onto the wheel and is either absorbed or reflected into a photodetector During wheel rotation, the photodetector signal approximates a square wave. The period of the square wave depends on the total number of radial strips dividing the wheel into equal sections and the rotation rate, Find the experimental parameters needed to obtain angular velocity measurements of the wheel with this tachometer experimental setup. Bean0 e Strip a) Sketch a data flow diagram from the laser to the Figure 1. Experimental Setup output recorded in a computer Refer to figure 1 . b) Work one example by hand. The calculations can be repeated to complete the table below Table. Calculation of Number of Tachometer Pulses shown in Number of Pulses/O1s for Wheel 2 RPM Hz from RPM MAE 2381 S18 Homework 2, Key Assignment, is due at 1230PM March 6th, 2018 5/6 Convert the revolution rate 20 RPM into a frequency in cycles sec, then to a period, T in seclcycle Find the period of the photodetector output square wave for a wheel rotating a 20 RPM and marked with 120 radial Nack plastic strips. Find the number periods of the square wave that will fit in an interval from 0 to 0.1s c) LabVIEW has a pulse counter function that determines the frequency in Hz of a signal for each 0.1 s time inmerval. A minimum of two cycles (two voltage rises) are required to detect the square wave; the LabVIEW function will signal "out of range if less than two cycles fall in the 1s window. What is the minimum RPM that can be detected with the wheel marked with 120 markings? With 30 markings? For the following questions, assume a DAQ sampling rate of 5000 samples sec is chosen. d) Find the temporal resolution &r between each photodetecior voltage sample V and determine the number of samples N displayed in the 0.1 s interval 6. A shiny wheel is marked with alternating radial strips of black plastic dividing the wheel into equal sections A laser beam falls at an angle onto the wheel and is either absorbed or reflected into a photodetector During wheel rotation, the photodetector signal approximates a square wave. The period of the square wave depends on the total number of radial strips dividing the wheel into equal sections and the rotation rate, Find the experimental parameters needed to obtain angular velocity measurements of the wheel with this tachometer experimental setup. Bean0 e Strip a) Sketch a data flow diagram from the laser to the Figure 1. Experimental Setup output recorded in a computer Refer to figure 1 . b) Work one example by hand. The calculations can be repeated to complete the table below Table. Calculation of Number of Tachometer Pulses shown in Number of Pulses/O1s for Wheel 2 RPM Hz from RPM MAE 2381 S18 Homework 2, Key Assignment, is due at 1230PM March 6th, 2018 5/6 Convert the revolution rate 20 RPM into a frequency in cycles sec, then to a period, T in seclcycle Find the period of the photodetector output square wave for a wheel rotating a 20 RPM and marked with 120 radial Nack plastic strips. Find the number periods of the square wave that will fit in an interval from 0 to 0.1s c) LabVIEW has a pulse counter function that determines the frequency in Hz of a signal for each 0.1 s time inmerval. A minimum of two cycles (two voltage rises) are required to detect the square wave; the LabVIEW function will signal "out of range if less than two cycles fall in the 1s window. What is the minimum RPM that can be detected with the wheel marked with 120 markings? With 30 markings? For the following questions, assume a DAQ sampling rate of 5000 samples sec is chosen. d) Find the temporal resolution &r between each photodetecior voltage sample V and determine the number of samples N displayed in the 0.1 s interval
