OP-TEC Course 1 Lab 1-3E

Hi. John Chamberlain here
with Fundamentals of Light and Lasers, Course 1. We’re outside today doing
a measure of the sun with our photometer for Lab
1-3E, Optical Photometer Use and Stability. Part 1 of this lab, you’re
going to be just reading the manual of the
photometer, so I’ll let you do that on your own. For Part 2, we’re
going to start off by reading the
measurements from the sun. So you can see that Derrick
is holding the photometer and pointing the
sensor right at the sun and getting that reading. What reading are you
seeing there, Derrick? DERRICK: 1.79 and 1.8. JOHN CHAMBERLAIN: OK. Well, we’ll record that reading
and then we’ll go back inside and we’ll compare that reading
to our helium neon laser power output. All right. Good job, Derrick. All right. We are back inside
now, and we’re going to use the photometer
to measure the laser. Now I hope you followed your
instructions on the manual and you zeroed your meter as you
were taking your measurements outside. So now we’re inside,
and we’re going to take that protective
cap off so that we can measure our laser. Let me show you what the inside
of that photometer looks like. You can look inside there. You can see our photo
sensor, and that’s where our laser beam is
going to strike and measure. And this meter is not quite
as sensitive as the other one. And we have pressed the
button down on our meter down here with some tape so
that we can hold it down. There’s two parts to this lab. One is to measure the helium
neon laser power level and also to measure
it over time. So we’re going to do
both of them at one time. As soon as we start
measuring this, we will start
measuring our reading. So there’s our first
reading as it’s coming in. And it looks like we’re reading
0.63 on the 20-milliwatt scale. So that’s 0.63 milliwatts. And we will write
that down as time 0. And then we’ll start
the clock, and we’re going to be recording
these every minute. So we will speed this
up for you so you don’t have to sit her and watch
this video for 30 minutes. So stand by. [music playing] All right. So we’ve got lots of data there. And we’ve compressed it down
into a short time period just for you, and
I hope that you were able to collect
some numbers off of that and that you can do it on your
own with your own photometer. That concludes Laboratory
1-3E, all three parts, showing the stability
of our photometer. And I hope that
you’ll press on now and do your own measurements. We’ll see you next time. [music playing]

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