- #1
NeoXx
- 22
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Hello,
I finished an experiment of finding out the track spacing of a CD and a DVD.
My laser wavelength was 654nm which I used to calculate track spacing of the optical discs.
I got a track spacing of a CD 1.57um which is close to a real value of 1.6um,
and the track spacing of a DVD 0.72um which is close to a real value of 0.74um.
Then I calculated the storage capacity of both and got 654 Megabytes for a CD which is pretty good but only 2786 MB for a DVD, which is pretty far from its true value of 4700 MB.
What did I do wrong?
Oh here's the worksheet I used to calculate the storage capacity:
http://www.teachengineering.org/collection/uoh_/activities/uoh_diffraction/uoh_diffraction_activity1_worksheet_mhf_tedl.pdf
Regards,
NeoXx
I finished an experiment of finding out the track spacing of a CD and a DVD.
My laser wavelength was 654nm which I used to calculate track spacing of the optical discs.
I got a track spacing of a CD 1.57um which is close to a real value of 1.6um,
and the track spacing of a DVD 0.72um which is close to a real value of 0.74um.
Then I calculated the storage capacity of both and got 654 Megabytes for a CD which is pretty good but only 2786 MB for a DVD, which is pretty far from its true value of 4700 MB.
What did I do wrong?
Oh here's the worksheet I used to calculate the storage capacity:
http://www.teachengineering.org/collection/uoh_/activities/uoh_diffraction/uoh_diffraction_activity1_worksheet_mhf_tedl.pdf
Regards,
NeoXx
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