Figure 1.
Block diagram of a typical communication system.
Figure 2.
The transmitter components.
Figure 3.
The receiver components.
Figure 4.
Wind speeds generated by each fan.
The Dyson fan plots are in blue, and Honeywell plots are in red.
Table 1.
Average flow velocities.
Figure 5.
Diffusion based propagation versus flow based propagation.
The system response to a 250(blue), and flow based propagation (red).
Figure 6.
Flowchart representation of the algorithm that controls the transmitter.
Figure 7.
Flowchart representation of the algorithm that controls the receiver.
Figure 8.
The system response to a short spray of 100(a) 2 m separation, and (b) 4 m separation between the transmitter and the receiver.
Figure 9.
System response for different initial voltages.
The system response changes based on the initial voltage.
Figure 10.
The system response for different experimental trials.
The flow in these trials is generated using the Dyson fan on very low setting. The spray duration is 100
Figure 11.
Analysis of the system response for different flows.
The delay to peak's maximum is used as one performance metric (a), and the peak's maximum to full width at half max is used as a second performance metric (b). The results from 10 different trials are averaged to create each point. The spray duration is 100 ms, and the separation distance is 2 m.
Figure 12.
System response to a periodic spray.
The dashed lines are 2 seconds apart and show each period. The arrows show the location where the sensor voltage decreases instead of increasing. The spray duration is 100
Table 2.
Different transmission rates and their reliability.
Figure 13.
Received signal when a 26 bit test sequence is transmitted.
Sensor reading for the 26 bit test sequence “10101100111000101011110110” transmitted 4 meters away at the rate of one bit per 3 seconds. The dashed red lines represent the start and the end of each bit. Honeywell fan is used to create the flow for this figure.
Figure 14.
Transmitted and received text message.
Pictures from a communication session: (a) the text entered at the transmitter (b) the text received at the receiver.