Wireless Sensor and Actuator Networks for Lighting Energy ...

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performance of the current research system also points to future research directions on supervisory-level design for practical system realization and commercialization. 10.1.1 Wireless-enabled Sensor and Actuator The design of photosensors with photodiodes integrating onto the wireless mote platforms has demonstrated the integration of wireless sensor networks to lighting technologies. The response of the photosensors was designed to closely match human eyes and be sensitive to the range of normal indoor lighting. With the much smaller size, lower unit price, and simpler deployment, the wireless photosensors have shown promise to replace traditional ceiling-mounted photosensors by being placed directly on the desktops for better estimating human perception of light. The development of wireless ballast actuation modules has explored the possibility of extending the monitoring role of typical wireless sensor networks to actuation, which actively affects the environment. In addition to the most obvious benefit of circumventing exorbitant and complicated rewiring with wireless links, individual addressability of the wireless actuation modules leads to a whole new direction of lighting control. With the capability of being dynamically configured and actuated at different levels, the wirelessly enabled luminaires present the promising potential to achieve energy efficiency and user satisfaction in a more versatile yet economic way. 189
10.1.2 Sensor Validation and Fusion for Wireless Sensor Networks The mote-FVF sensor validation and fusion algorithm exploits fuzzy logic and time series exponential moving average techniques to extract pertinent information from redundantly deployed sensors while rejecting faulty or disturbed sensors. The miniature wireless photosensors afford being placed on the desktops for better estimating human perception of light. Redundancy has to be enforced in order to account for the tendency of the tiny desktop-mounted photosensors to be disturbed. The sensor validation and fusion algorithm complements the redundant-deployment strategy and returns representative fused values for lighting control purposes. The developed sensor validation and fusion algorithm has shown its ability to work with sensors monitoring daylight changes and can function appropriately under any possible desktop illuminance change in a daylit environment. The fused values were accurate within 5% of the gold standard light meter readings in the testing experiments, even in situations where some of the sensors were experiencing failures and disturbances. The maximum error ever measured between the fused value and the real illuminance was well beyond the sensitivity of human eyes. The implementation of a closed-loop lighting system using fused sensor readings as sensory feedback also demonstrated good performance of keeping the desktop illuminated at the desired level under the appearance of extraneous light and sensor failure. Although the mote-FVF algorithm was designed for and tested on lighting applications, it can easily be adapted to other applications where aggregated sensor values may reveal more valuable information than row readings from individual 190
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Wireless Sensor and Actuator Networ
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Abstract Wireless Sensor and Actuat
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To my wife for having faith in me a
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Table of Contents Chapter 1 Introdu
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6.4.2 Lighting Optimization Algorit
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10.2.1 Theoretical Contributions...
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List of Figures Figure 1-1 Research
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Figure 7-8 Voltage divider. .......
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Figure 9-31 Energy savings vs. payb
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The integration of wireless sensor
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esulting lighting is optimal in the
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acquisition and wireless transmissi
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a central base computer for sensor
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optimal light settings were in turn
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possibility of wireless actuator ne
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Chapter 2 Motivation The motivation
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[21]. Lighting accounts for 30% of
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Table 2-1 summarizes each of the co
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from light level tuning impossible
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used in the progress of this resear
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are expected to autonomously config
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office, and industrial applications
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Chapter 3 Related Research and Lite
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Although radio frequency is a suppo
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channels with different capabilitie
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In practice, fusion of sensor data
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The emergence of wireless sensor ne
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A is empty f A (x) = 0, x X (3.1)
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Convex combination: the relation Th
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where no crisp boundary can be defi
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developed by Dantzig [87]. The ineq
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sensor network is far more valuable
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Figure 4-1 Mote-FVF algorithm archi
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Figure 4-2 Gaussian correlation cur
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predicted reading. Note that the of
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fuzzification and m for the defuzz
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mote sensors were arranged in a 3-b
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Figure 4-6 Mote-FVF with median val
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Figure 4-8 Comparison of variations
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The daylighting system application
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The key components are the predicti
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Figure 5-3 Prediction performance o
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Figure 5-5 Prediction performance o
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Among them, adaptive Wiener filteri
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even though the sensed environment
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5.3 Simulation and Experiment Resul
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Figure 5-11 Adaptive sensing with d
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Figure 5-13 Damped adaptive sensing
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Chapter 6 Optimal Lighting Actuatio
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of the workplane level illuminance
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office with K luminaires, for examp
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E sub = e pq e rs e xy 1
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optimizer for a consistency check.
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Figure 6-4 Pseudo code of the light
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simulation was to show that the opt
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It is obvious from Figure 6-6 and F
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Chapter 7 Wireless-Enabled Lighting
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determined to be 0-2000 lux. Conseq
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discrete outputs from the motes spa
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actuation technologies, and additio
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Figure 7-8 Voltage divider. Since t
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Given the 256-level dimming capabil
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Figure 7-11 Prototyping Luminaire S
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to its simplicity. Although coded w
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The second experiment was executed
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Chapter 8 System Verification on Hu
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commercial system was randomized fo
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8.2.1 Hardware Implementation in Sm
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eference point on the desktop was s
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commands were received. In addition
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were provided with three wireless p
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(a) Figure 8-6 Sensor placement of
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lower meter readings was that the m
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(2) Subtle and invisible shadows ma
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function keys are. The function key
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deliberately perturbed the lights d
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Table 8-2 Summary of the test on pr
Page 156 and 157: Current Level on the investigator
Page 158 and 159: Chapter 9 System Implementation and
Page 160 and 161: Figure 9-1 Floor plan of the small
Page 162 and 163: Figure 9-3 System operation diagram
Page 164 and 165: campus-wide lighting maintenance, w
Page 166 and 167: message is addressed. The destinati
Page 168 and 169: Both the actuation and the grouping
Page 170 and 171: The construction or updating of the
Page 172 and 173: determines if this message is for u
Page 174 and 175: Figure 9-12 Lighting preset setting
Page 176 and 177: Figure 9-13 Average hourly percent
Page 178 and 179: 9.4 Daylight Response The second ph
Page 180 and 181: Furthermore, the structure allows t
Page 182 and 183: Figure 9-16 Daylight harvesting tes
Page 184 and 185: Figure 9-18 Sensor readings in the
Page 186 and 187: then gradually dimmed. After reachi
Page 190 and 191: Seven-occupant case with simulated
Page 194 and 195: under significant daylight. Again,
Page 196 and 197: newly calculated light settings may
Page 198 and 199: Annual energy consumption = ( Numbe
Page 200 and 201: Figure 9-30 Energy savings vs. payb
Page 202 and 203: have partially contributed to the h
Page 204 and 205: $40 per unit and the system achieve
Page 208 and 209: sensors. The research in [14] prese
Page 210 and 211: Other than optimizing the energy co
Page 212 and 213: lighting configuration in the offic
Page 214 and 215: communications. The adaptive sensin
Page 216 and 217: integration of the research system
Page 218 and 219: will broaden the application to dif
Page 220 and 221: system could be reallocated to oper
Page 222 and 223: entities could be tremendously crit
Page 224 and 225: [7] J. A. Veitch and G. R. Newsham,
Page 226 and 227: [20] K. A. Karmel, High Performance
Page 228 and 229: [34] P. Levis, S. Madden, J. Polast
Page 230 and 231: International Workshop on Wireless
Page 232 and 233: [57] LonMark International, "Fact S
Page 234 and 235: [71] S. Sahni and X. Xu, "Algorithm
Page 236 and 237: Proceedings of the 1st Internationa
Page 238 and 239: [99] SPOT: Sensor Placement + Optim
Page 240 and 241: [113] Advance Transformer Technical
Page 242 and 243: A.2 Circuit Schematics of Photosens
Page 244 and 245: A.4 Circuit Schematics of the Secon
Page 246 and 247: Appendix B Human Subject Test B.1 C
Page 248 and 249: (a) Sensor placement of subject No.
Page 250 and 251: B.2 Comparison of System Performanc
Page 252 and 253: B.3 Summary of the Responses from t
Page 254 and 255: B.4 Human Subject Test Approval Let
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B.5 Human Subject Test Protocol Nar
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B.7 Human Subject Test Questionnair
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B.8 Human Subject Test Interview Sc
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Luminaire surface depreciation: 1.0
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Table C-1 Daylight reception durati
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At the rate of 9.62 cents per kWh a
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