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Table 1: ANSI FL1 Peak Beam Intensity and Beam Distance Measurements for Wrist-Ler Peak Beam Intensity (lux) Measurement # Configuration # of NIMH AA Battery in series Wrist-Ler 2 1 2 3 4 5 Mean 556 572 568 551 569 563.2 Beam Distance (m) Standard Standard Mean Deviation Deviation 9.148 47.46 0.386 The peak beam intensity does not meet the target specifications of 750 lux. However, when turned on in a dark room, the light produced by the Wrist-Ler is very bright and we believe it is sufficient to be used and make a positive impact in the health clinic in Muhuru Bay. The beam distance does meet required standards. In the health clinic, the Wrist-Ler will be used in a setting very close to the patients so a beam distance of 47.46 meters is more than enough to be effective. Beam Distance Sample Calculation: ππππ ππππ π΅πππ πΌππ‘πππ ππ‘π¦ (πππππππ) 563.2 πππππππ π΅πππ π·ππ π‘ππππ (π) = β = β = 47.46 π 0.25 ππ’π₯ 0.25 ππ’π₯ Mean of Peak Beam Intensity Sample Calculation: ππππ ππππ π΅πππ πΌππ‘πππ ππ‘π¦ (ππ’π₯) = β πππππ π’ππππππ‘π 556 + 572 + 568 + 551 + 569 = πππππ π’ππππππ‘π 5 = 563.2 ππ’π₯ Standard Deviation of Peak Beam Intensity Sample Calculations: β(πππππ π’πππππ‘π βπππππ )2 ππ‘π. ππππ π΅πππ πΌππ‘πππ ππ‘π¦ (ππ’π₯) = β πππππ π’ππππππ‘π β 1 (556 β 563.2)2 + (572 β 563.2)2 + (568 β 563.2)2 + (551 β 563.2)2 + (569 β 563.2)2 = β 5β1 = 9.148 ππ’π₯ Table 2: Voltage Measurements for Wrist-Ler Repeated Measured Configuration Wrist-Ler # of NIMH AA Battery in series 2 Measurement Type 1 2 3 4 5 Mean Standard Deviation Voltage across Light Source (volts) 2.531 2.523 2.527 2.502 2.501 2.518 0.01521 Current Draw from Light Source (amps) 0.63 Power Consumption from Light Source (watts) 1.594 1.594 1.617 1.601 1.626 1.606 0.0143 0.63 0.64 0.64 0.65 0.638 0.00837 Battery Capacity 5.821 5.818 5.812 5.755 5.752 5.791 (watt-hrs) Battery Life (hrs) Light Duration to Crank Time Ratio (min of cranking / 1 min of lighting) 0.035 3.651 3.651 3.594 3.594 3.539 3.606 0.0471 2.52 2.52 2.56 2.56 2.6 2.552 0.0335 The voltage across the light source, current draw from light source, power consumption from light source, battery capacity, and battery life all meet required standards. The voltage of the light source was found using a multimeter and is representative of the two individual batteries connected in series. The current draw from the light source is the current that goes through the LED circuit. By changing the resistor value in the LED circuit, the current will change. The power consumption, battery capacity, and battery life can be calculated with the formulas as seen below. The power consumption of approximately 1.606 watts can be changed based by changing the resistor in the LED circuit and thus changing the current through the light source. The battery capacity of approximately 5.791 watt-hours is representative of the watts provided by the batteries per hour. The battery life of approximately 3.606 hours is more than sufficient to finish up surgeries or births that start when a power outage begins. The light duration to crank time ratio does not meet the target specifications of 15 minutes of lighting for 5 minutes of charging. This is in part due to the weak resistor in the LED circuit which causes the LED to draw a significant amount of current from the batteries. By using a stronger resistor in the LED circuit, the current drawn will be reduced and the desired specifications could be achieved. We decided to use the weaker resistor as we believed a larger brightness by the LED would be more useful in the health clinic setting in Muhuru Bay. However, by implementing a better crank (larger and more efficient) in the future, the ratio can approach the desired value of 3 minutes of lighting for 1 minute of charging. Power Consumption Sample Calculations (measurement 1): πππ€ππ (π€ππ‘π‘π ) = ππππ‘πππ (π£πππ‘π ) β πΆπ’πππππ‘ (ππππ ) = 2.531 π β 0.63 π΄ = 1.594 π€ππ‘π‘π Battery Capacity Sample Calculations (measurement 1): π΅ππ‘π‘πππ¦ πΆπππππ‘π¦ (π€ππ‘π‘ β βππ ) = ππππ‘πππ (π£πππ‘π ) β 2.3 (πππ β βππ ) = 2.531 π β 2.3 πππ β βππ = 5.821 π€ππ‘π‘ β βππ Battery Life Sample Calculations (measurement 1): π΅ππ‘π‘πππ¦ πΏπππ (βππ’ππ ) = π΅ππ‘π‘πππ¦ πΆππππππ‘π¦ (π€ππ‘π‘ β βππ ) 5.821 π€ππ‘π‘ β βππ = = 3.651 βππ πππ€ππ πΆπππ π’πππ‘πππ (π€ππ‘π‘π ) 1.594 π€ππ‘π‘π Crank to Lighting Duration Ratio Sample Calculations (measurement 1): πΆπ’πππππ‘ ππππ€ ππππ πππβπ‘ π ππ’πππ (ππππ ) 0.63 ππππ = 0.25 ππππ 0.25 ππππ = 2.52 min ππ ππππππππ/ 1 min ππ πππβπ‘πππ πΆππππ π‘π πΏππβπ‘πππ π ππ‘ππ = Table 3: Drop test survival for Wrist-Ler Repeated Measured Configuration Wrist-Ler Drop Height (ft) Measurement Type 1 2 3 4 5 Final Pass? Unit still operates Y Y Y Y Y Y/N Any broken components N N N N N Y/N 4 The drop test meets target specifications because the Wrist-Ler still operates after being dropped from a height of 4 feet multiple times.
