Rayleigh Scattering E-6
Contents
1. 1 NeuLog EJ Experiment E 6 Rayleigh Scattering Objectives o learn about Rayleigh scattering and how it affects the color of the sky To investigate visible UVA and UVB light throughout the day Modules and Sensors PC NeuLog application USB 200 module 4 BAT 200 Battery module VIEW 200 digital display module NUL 204 Light logger sensor NUL 230 UVB logger sensor as NUL 232 UVA logger sensor 2 Experiment E 6 Rayleigh Scattering Ver 3 0 4 2 NeuLog ES Introduction Why is the sky blue Lord Rayleigh a British physicist studied the way in which sunlight passes through our atmosphere and is scattered by gas molecules in the air He found that blue light is much more easily scattered than red light The reason is that the blue wavelength around 400 nm is closer to the size of the air molecules than the red wavelength around 700 nm He proved that the amount of scattering is inversely proportional to the fourth power of the wavelength This is the reason why the sky away from the sun appears blue Red or yellow are scattered a lot less and reach our eyes when looking at the sun Why does the sky look yellow or red at sunrise and sunset When the air is clear the sunset appears yellow Light from the sun in different wavelengths pass a long distance through air while blue light is scattered away If the air contains small particles natural or pollution the sunset will look red Ray2. e sampling Experiment E 6 Rayleigh Scattering Ver 3 0 4 18 19 20 21 22 20 7 NeuLog ES Come back to the same place every two hours and repeat the measurement until you have 5 samplings If there is a shadow in the place where you measured before move to a place with more light At the end of the measurements connect the sensors to the computer using the USB 200 module Click on the Search for Sensors icon Q and then click on A the Off line Experiment icon Gass 1 Click on the Load Experiment icon w The menu shows a list of stored experiments in the sensor s memory up to 5 Choose the required experiment in this case the Oldest and click on the Load Experiments button In order to focus on the desired range click on the Zoom icon Q locate the mouse cursor at a point above the graph and press its left button keep it pressed and create a rectangle that includes the whole range NeuLog CO a gt F Pine LE eaat Teiu ETEN Rus zipp Suri Chi Ee Epei Expenmment Experiment Experia EEeiment Experi irre hii L i 0 1 io mien ws D 1 nH RQ eabekb BBB Unzeom foam Zoom Select Lina one Grid Graph Table Point Area Aull Fit fone Width Functions Experiment E 6 Rayleigh Scattering Ver 3 0 4 24 29 26 af 28 29 30 31 8 NeuLog EF Save your graph Click on the Show Functions icon p s Click on the Light button on the left
3. leigh scattering is also relevant to ultraviolet light UV UV light has a shorter wavelength than blue light and is scattered even more than blue light UV rays are the main cause of damage to skin from the sun therefore it is important to Know in which hours they are more intense In this activity we will examine Rayleigh scattering by measuring visible light UVA 400 315 nm and UVB 315 280 nm during the day Experiment E 6 Rayleigh Scattering Ver 3 0 4 3 NeuLog x Procedure Experiment setup 1 Connect the Light UVA and UVB sensors to the USB module as shown in the picture below 2 Make sure you have a charged battery module and a digital display module If you don t have a digital display module you can use a graphic display module or conduct the experiment without a viewer You could also use a WiFi module with a tablet or a smartphone Experiment E 6 Rayleigh Scattering Ver 3 0 4 4 NeuLog EJ sensor setup 3 Connect the USB 200 module va to the PC 4 Check that the light Ey uva eS and UVB Mas are connected to the USB 200 module sensors Note The following software functions are explained in short It is recommended to practice the NeuLog application functions as described in the user manual beforehand 9 Run the NeuLog application and check that the sensors are identified Experiment E 6 Rayleigh Scattering Ver 3 0 4 5 NeuLog ES settings Note This ex
4. of the screen Look at the maximum value and fill in the table below NeuLog T T Ai E T te gt Q o A ken Opes t t Placer faperwnent Se dP fxperiment xperenest x me Ekme ons Gid Geaph Table Point Area ee Time of day Sensor Light hen Ix ee ee ee ee a a mW m Click on the UVA button on the left of the screen Look at the maximum value and fill in the table Click on the UVB button on the left of the screen Look at the maximum value and fill in the table Experiment E 6 Rayleigh Scattering Ver 3 0 4 32 33 9 NeuLog EJ Load the rest of the measurements from the sensors up to 5 and fill the table with the maximum values of each sensor Create graphs for each sensor by using Microsoft Excel or alternatively use this grid Experiment E 6 Rayleigh Scattering Ver 3 0 4 10 NeuLog EJ 34 These are sample graphs plotted by Excel Visible light lx 99730 sos70 _ 528 uva mw m 495s0 zee 287 ol uvatmwym 1356 sej oz ol n i2000 Experiment E 6 Rayleigh Scattering Ver 3 0 4 11 NeuLog EJ Summary questions Lis How did the visible UVA and UVB light change throughout the day Where there different patterns in the graphs Explain your results in terms of the Rayleigh scattering phenomenon Experiment E 6 Rayleigh Scattering Ver 3 0 4
5. periment should begin in the morning and be conducted throughout the day Samplings will be gathered every two hours 6 Click on the Off line Experiment icon Ga in the NeuLog main icon bar 7 Click on the light Sensor s Module box 8 Click on the Range button 9 Select the 0 150 000 lux button to change the sensor s mode w 7 O On Line Off Line Visuals NeuLog About ensors Experiment Experiment Mode Tools NeuLog Light id 1 Range 0 150000 lux Duration 10 seconds Rate 5 per second tt 10 Click on the Experiment Setup icon and set the Experiment duration to 10 seconds sampling rate to 50 per second All the connected sensors will be set with these parameters Experiment E 6 Rayleigh Scattering Ver 3 0 4 6 NeuLog EJ Testing and measurements 11 12 14 15 16 17 Disconnect the sensors from the USB module Connect the light UVA and UVB sensors to the battery module and the digital display module r A Pi of If you do not see the light sensor s reading on the digital display module press on the display module button a few times until you see the reading Aim the sensors opening toward the sun Do not look straight at the sun Direct the sensors to the point where the light sensor reading is maximal Press on the sensors Light UVA UVB start stop buttons to start the measurement and wait until their LEDs shut off Write down the time of th
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