Conference Session

Instrumentation Division Technical Session 1

Collection

2020 ASEE Virtual Annual Conference Content Access

Authors

Stephen A. Strom, Pennsylvania State University; Marius Strom, Saint Francis University

Tagged Divisions

Instrumentation

reflectivesurface to “bounce” the beam from one to the other. In the latter case, the maximum distancefrom emitter to object appears to be 1 inch.This sort of switch was considered for application as an optical propeller tachometer. In thiscase, either method of edge detection can be used, although the reflective mode of operation maybe desired due to possible changes in blade coning angle. In either case, the parameter of interestwill be the change in voltage measured in Figure, which will change whenever the blade passingthrough the IR beam (the “sensing area”). For a tachometer based on reflection, it is anticipatedthat the voltage seen by the GPIO port will approximate the curve shown in Figure 6. Figure 6: Reflective IR

Conference Session

Instrumentation Division Technical Session 2

Collection

2020 ASEE Virtual Annual Conference Content Access

Authors

Daniel Dannelley, Embry-Riddle Aeronautical University, Prescott; Elliott Bryner, Embry-Riddle Aeronautical University

Tagged Topics

Diversity

Tagged Divisions

Instrumentation

thelimitations of simplifying assumptions can affect the prediction (i.e. course calculations vs. realworld measurements).9 - Sonic Flow MeasurementThis exercise uses an engineered piping system to create a contained shock wave. Two pipes areseparated by a flange containing a plastic diaphragm. The first pipe is slowly pressurized untilthe diaphragm is burst and a shock wave is transmitted down the second pipe, then reflected backthrough the system. The second pipe is instrumented with two pressure sensors along the line oftravel, which allows for determination of the pressure rise as well as velocity of the shock wavecorresponding to the initial pass as well as the following reflections. This exercise focuses oncomparing the experimental results to the

Conference Session

Instrumentation Division Technical Session 1

Collection

2020 ASEE Virtual Annual Conference Content Access

Authors

Bradley Lane Kicklighter P.E., University of Southern Indiana

Tagged Topics

Diversity

Tagged Divisions

Instrumentation

Proximity SensorThe AutomationDirect CK2-CP-1H capacitive proximity sensor [8] has an 8 mm sensingdistance and consumes 530 mW (see Figure 5).Figure 5: Capacitive Proximity Sensor (AutomationDirect)A capacitive proximity sensor senses metals and non-metals [7]. This sensor has a normallyclosed output, so the output is off when it senses metal. Thus, the sensor output will be on whenthe hole in the disk is in line with the sensor.5.2.3 Photoelectric Retroreflective SensorThe AutomationDirect FBP-DP-0E retroreflective sensor [9] has a 2.5 m sensing distance andconsumes 480 mW (see Figure 6).Figure 6: Retroreflective Sensor and Retroreflector (AutomationDirect)A retroreflective sensor emits light that is reflected back to it by a retroreflector [7