PFIS Assembly: Integration
08 March 2005:
We began the tip/flexure test today. Below are pictures of us using the hoist
to control the tipping of PFIS on its dolly.
Being tipped over provides good views into the instrument. Below left is the
disperser area (with a mass mock-up etalon). Below right is the slitmask
mechanism (with a couple of slitmasks loaded in the magazine).
23 February 2005:
The electronics boxes - Power Distribution System (PDS), Satellite Controller
Box (SCB), Satellite boxes 1 and 2 (PSC1 and PSC2) - have been strapped onto
the structure and the wiring harness completed. Note: The boxes currently
do not have their cladding on.
||From Top Left: SCB, PDS and PSC1:
||Closeup of PDS with PXI crate:
Here's a nice view of the filter
mechanism with the endplate on the magazine off. The first five filters are
spectroscopy order-blocking filters. There are also six Fabry-Perot
interference filters in the magazine. The final cutoff filter is the 460nm
filter, which looks very yellow to the eye, and the first interference filter
is the 434nm, which looks blue. So, naturally you
05 January 2005:
We have finished installing and testing the grating mechanism. Below is an
image of a grating in place during testing.
29 December 2004:
Mike has begun installing the baffling around the disperser area. Because the
camera articulates, the baffling has to move with it. To accomplish this, a
baffling screen that can roll up will be attached to each side of the camera.
13 December 2004:
The low- and medium-resolution etalons have arrived and Ted Williams and his
graduate student Naseem Rangwala from Rutgers University are visiting for
the week to install and test them on PFIS. Below are pictures of the process
of installing the low-resolution etalon onto the PFIS structure.
15 November 2004:
The PFIS detector dewar was attached to the camera today. Below left shows
the cryotiger hose connections, ion gauge, and vacuum port. Below middle shows
the electrical connectors. Below right is a
picture taken through the camera at the CCDs.
11 November 2004:
The camera is aligned with the collimator and the grating mechanism and support
structure have been attached to the camera cradle. Below right is a movie
(1.6Mb) of the camera articulating.
01 November 2004:
With the camera installed we began the alignment process. This was the first
time we removed the front cover of the camera and exposed the asphere.
29 October 2004:
Today, the camera and articulation cradle were lifted onto the structure.
Pictures of the actual lifting will be forthcoming.
28 October 2004:
We lifted the camera out of its box and onto the cradle. The camera sits on a
three-point ball-in-groove kinematic mount. Adjustments to the camera position
will be made when we align the camera with the collimator on the structure.
21 September 2004:
Mike installed the etalon mechanism today. The rails, pneumatics, and moving
bases (below left) all are fixed to the structure, while the etalon holders
(shown below right sans etalons) are removable. There will be three etalons
total, with two mounted on the instrument at any time. They may be used in
single- (low resolution) or double-etalon (mid or high resolution) modes.
13 September 2004:
With the main collimator group in place, the other optics of the collimator
can be installed and aligned. To the left is a view of the field lens/guider
mount as seen from below. At right is the fold mirror structure and collimator
With the optics aligned, we have begun to fix the spacing for the collimator
doublet to ensure best colllimation (making sure to put the waveplate
compensator in place!). This is done using an autocollimation
setup shown below. The slitmask rollers (below left) are put in place and a
specialized slitmask frame (below right) allows for a pencil lamp to shine
through a pinhole at the focal plane, off an autocollimating mirror after the
doublet and back through the collimator to be imaged by a CCD camera. By
adjusting the position of the doublet we can look for the smallest return
26 August 2004:
The first installation of the collimator into the structure occurred today.
The Main Collimator Group, with a mass of 21 kg (46 pounds), was lifted, via
the overhead crane, and lowered into the collimator tube. It bolts down to
an invar interface ring (shown in last picture below).
It would later be taken out, a part machined, and reinstalled.
13 August 2004:
We performed a test alignment with the flat mirrors. This allowed us to get
a feel for the alignment process before insertion of the collimator optics.
We set up crosshairs at the top and bottom of the collimator tube as a crude
proxy of the optical axis to which we aligned the scope. We then aligned the
double-sided flat. Finally, the fold flat was adjusted until the pupil target
was centered in the field.
Mike attaches the fold flat structure.
The fold flat and pupil target.
The alignment scope setup.
10 August 2004:
The structure arrived in Madison last week, so integration of PFIS can begin.
Below are pictures of the structure on the dolly.
Mike has attached the slitmask mechanism elevator and magazine to the structure
for fit checking. The picture on the left shows the access to the slitmask
magazine, the removal of which should not be too difficult. The picture on the
right shows the invar interface ring on the bottom of the collimator tube and
the elevator at its home position.