PHYS 4C: Laser Communicator Project
This is a blog, run by a group of students, created to keep track of the process of building a laser communicator. This blog presents about everything we used and did in order to build a working laser communicating device. We also presented some of the data collected in order to do analysis concerning with sound and light waves.
Thursday, June 14, 2012
Error that contributes to uncertainties
Three main errors:
1. Sensitivity of microphone
2. Noises from speaker
3. Resistance of circuit
There are some errors that contribute to
the uncertainty, for example, the microphone is not sensitive enough, so we
need to speak louder and cover the microphone with hands in order for the
microphone to detect the signals. To improve this, we can use a better
microphone.
Also, the sound from the speaker is not
really clear and has noises. This is because not just laser light, but many
other light sources from the environment reach the solar panel, which contributes
to the noises. To improve this, we can use filter to cancel out the noise.
In addition, there is extra resistance
throughout the entire circuit. To improve this part, we can use less wire.
Also, we can take the resistance of the circuit into account when we do the
calculations to obtain a more accurate result.
Is the criteria of success fulfilled?
YES!!
We successfully build a working laser
communicator, and prove that sound and light synchronized with each other.
Also, the graphs show that the light intensity is proportional to the sound
pressure amplitude square, and as sound pressure amplitude increases, the induced
current also increases. Lastly, we were able to make a computational model that shows how sound waves are in 3 dimensional space. Therefore, these match with what we expected before.
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