Tuesday, 19 January 2016

2. Methods

2. Methods


2.1 Equipment List



    • 2 UV sensors
    • 3 different light bulbs
    • Light sensors
    • 1 table lamp
    • 1 wire
    • 1 charger for the datalogger


2.2 Diagrams of experimental setup  


Figure 1: Experimental setup used to detect the UV and light ratio of the bulb that we are testing.




2.3 Procedures


  1. Set up the experiment in a dark box with minimal light.
  2. Measure the brightness using UVB, UVC and visible light.
  3. Repeat the experiment 3 times and take the average.
  4. Set up a light bulb and repeat step 2 and 3. Make sure that the light bulb is 10 cm away from the sensors.
  5. Repeat the experiment using the other 5 lightbulbs.
  6. Record the findings on a table.
  7. Subtract the UV and brightness of the room and those of the bulbs.


2.4 Risk Assessment and Management  


The students will be exposed to low
concentration of UV rays and may have a chance of developing cancer.
Low
Students must reduce all skin exposure to his/her body in order to reduce the chance of cancer.
The students may break the bulbs and step on the glass.
Medium
Students must be careful when handling the bulbs especially when near each other.


The students may trip on the wires that are connected to the bulb. The wires on the floor.
High
Students must not run in the lab and be careful. We must also keep the wires in order to prevent them from tripping on the wires.


The fluorescent bulb that is used may break and when it does, the contents may cause cancer once it enters a flesh wound.
High
Students must be extra careful when handling or near the fluorescent bulb.


2.5 Data Analysis


1 . Find the ratio of the UV radiation and the light concentration of the room that we are in first.
2. Find the ratio of the UV radiation and the brightness of the each of the bulbs.
3. Subtract the ratio of the room and that of the each of the bulbs and we get the correct ratio of each of the bulbs.
4. The bulb with the lowest UV radiation and the highest brightness is the best bulb.

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