Designing and experiment to measure photocell output with distance from Infrared radiation?

Question

I have to plan an experiment to do in a lab (but i dont actually have to do it) to investigate how the output of a photocell depends on its distance froma point source of IR radiation. I need to find how the procedure would be, how the output of the photocell would be measured, the ranges of distances, the circult diagrams, and safety precautions and well as featured that would ensure reliabilty and accuracy of my results. This isnt my coursework, but a practice planning exercise im so stuck on. any help would be appreciated!!

Answer 1

Just for starters
Equipment
1. IR source (heat bulb. bathroom type will do)
2. Photocell
3. Measuring tape
4. Voltmeter (digital is nice)

Procedure
Mount the lamp in a socket parallel to the wall or to the table

L ------>Ph(1) -------> Ph(2) ------- Ph(3)
_________Table_______________

L -light source
Ph(1) - position 1 of the photocell

By connecting the photocell to the meter and measuring output from the photocell a 5-6 different distances ( three positions are shown above) record the values.
You have to demonstrate the inverse square law.
I=I0/R^2
Make sure that the photocell is in a cradle resting on the table and continuously has the same angle with the source.

I hope it gives you a start