AST195
PROJECT
SOME
EQUIPMENT -- SOLAR FILTER
Do not attempt to
observe the sun on your own until you have received training in lab.
In this
project you will construct a solar filter for your telescope using some
cardboard and staples (you provide these) and some high-quality solar filter
film from Germany called Baader Astro-Solar Film (the college provides this).
You need:
·
Your
telescope
·
Lightweight
cardboard (like cereal boxes)
·
Small
scissors (for cutting small, round holes)
·
Good,
heavy tape or a stapler
·
A
container (such as a cheap plastic food storage container, or a box with a lid)
to safely store the completed filter in. You must have a prominent label on the
container that says “TELESCOPE SOLAR FILTER – HANDLE WITH CARE” (why? Because students in the past have had
family members trash their solar filters because the family members did not
know what the solar filter was and thought it was some cardboard junk).
The basic
method of making a filter is to sandwich the film between two rings of
cardboard (such as is shown below), which are attached to a sleeve that fits
over the end of the telescope. The usual
appearance is shown at right. The tough
part is attaching the sleeves to the two ring sandwich, without damaging the film. This is usually done by making a strip of
cardboard with tabs (such as is shown on the next page). The tabs are attached to the rings.
Click
here for a video on how to make a solar filter.
You will need
to provide cardboard, scissors, etc. for constructing stuff from
cardboard. Light cardboard (such as is
used in cereal poxes) is probably the best choice. Heavy corrugated cardboard is probably not a
good idea -- too stiff. You also will
need your telescope tube for sizing the filter and sleeve.
As shown in
the video, you will make the cardboard parts of the filter, and obtain a
protective container/case for the filter, at home. We will do the final assembly, in which we
install the filter film, during lab time.
You will need a container in which to put the filter.
The filter is an important piece of safety equipment that will protect
your eyes, and it must be properly cared for.
The container must be labelled as described above.
To receive
credit for this project you will need to successfully construct a filter and
obtain a container/case. Print out and
turn in the form illustrated below (click here for the form) for
credit.
Note -- you
are not constructing a toy. You are
constructing an important piece of astronomical safety equipment. Do a poor job of constructing your filter, or
do a poor job of caring for your filter, and you may damage your eyesight when
viewing the Sun. Do not attempt to
observe the sun on your own until you have received training in lab.
The basic cardboard parts of the filter (see the
video):