Spatially resolved spectrometer system for the ZT-40 device Page: 4 of 7
This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided to UNT Digital Library by the UNT Libraries Government Documents Department.
Extracted Text
The following text was automatically extracted from the image on this page using optical character recognition software:
M M BS3 9
M 7 - - - 2 M
B7\M7 .
3 <L2 bL1
ZT-40
VACUUM L S3 S2 SI
VESSEL
PM3 PM2 PM1
AMP AMP2 AMPI
M1 M2 M3
Fig. 1.
Schematic optical layout of the diag-
nostic. M refers to mirrors, B.S.
to beam splitters (fused quartz), L
to the alignment laser (HeNe), S to
spectrometers, and PM and AMP are the
phototubes and amplifiers respectively.- 12V
.01vf 10of
2N4343
1pf 100K N
1K 10K 500 100
1000of }Opf
Fig. 2.
Schematic of the phototube amplifiers.
The input switching (1 kQ, 10 kQ,
100 kQ) provides three decades of
sensitivity. The output is designed
to handle the 50 S load inherent in
LeCroy 2256S digitizers.decades of sensitivity. This selectivity has proven useful in enabling
observation of both weak and strong lines with the same instrument without any
system modifications. RCA type 1P28 phototubes are utilized which respond to
wavelengths between 190.0-700.0 nm.
The wavelength drives are ganged in order to provide a common wavelength
setting for moving from line to line. This multiple grating, single drive
feature is what sets this system apart from other multiple spectrometer
systems. It allows one to move rapidly from line to line, after calibration,
without having to independently set a number of different instruments to
exactly the same wavelength. Because the individual drives are not completely
identical, this ganging is only accurate over about a 20.0 nm region. Larger
changes require readjustment of the drives to compensate for the 0.05 nm
maximum misalignment that may occur from one instrument to the next in
20.0 nm. This operating window is wide enough to encompass such useful sets
of lines as the CV-CIII lines at 227.1 and 229.7 nm without realignment.
The drive coupling is accomplished by a spring steel universal joint
commercially designed for potentiometer shaft connections. The joint provides
a means of compensating for imprecise shaft alignment without introducing any
loss of precise rotational coupling. Final shaft connections are collet-type
couplings to prevent rotation during the tightening process.3
Upcoming Pages
Here’s what’s next.
Search Inside
This report can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Report.
Watt, R.G. Spatially resolved spectrometer system for the ZT-40 device, report, May 1, 1981; New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc1204042/m1/4/: accessed April 26, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.