1
00:00:00,030 --> 00:00:09,030
so it is a small scattering sensor that
contains a laser source very similar to

2
00:00:09,030 --> 00:00:16,020
the technology you would have in your CD
or DVD player then there's a number of

3
00:00:16,020 --> 00:00:20,279
an array of detectors that measure that
scattered light and from that