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Specifications of the Zenith Motor:
Resolution:
Accuracy (24 hours):
Angular range:
Table 2.2 Optical Components of Brewer Spectrophotometer
Identification
Description
AP 1
Fixed aperture, 11.18 mm
ES 1
Entrance slit plate, dia: 26.37 mm, thk: 0.10 mm
Slit, length: 3.30 mm, width: 0.34 mm.
EX 1
Exit slit plate, length: 28.95 mm, width: 19.05 mm, thk: 0.10 mm
Slits, length: 5.08 mm, width(3): 0.589 mm, width(3): 0.632 mm.
EX 2
Exit slit plate, dia: 26.37 mm, thk: 0.10 mm
Slit, length: 5.08 mm, width: 0.632 mm.
FW 1
Filterwheel #1 made from aluminum gear material, with two
ground G1-quartz disk, dia: 25.4 mm, width: 1.59 mm, and film
polarizer, dia: 25.4 mm, width: 1.59 mm.
FW 2
Filterwheel #2, made from aluminum gear material with 5
neutral-density filters; each with dia: 25.4 mm,
width: 1.59 mm; attenuations: 0.5, 1.0, 2.0, 2.5 decades
(prepared from G1 quartz blanks )
GR 1,2
Grating, 3600 line/mm holographic plane reflectance,
dia: 50 mm, thickness: 10 mm (Jobin-Yvon)
HL 1
Tungsten-halogen lamp, 12 V, 20 W, Osram 64425, mounting:
Amel Socket for #28-8341 light source
IR 1
Iris diaphragm, aperture range: 2 to 12 mm (Edmund Scientific
catalogue #40997)
LE 1
Lens, double-convex, G1-quartz, focal length: 25.4 mm, dia: 25.4 mm
LE 2
Lens, plano-convex, G1-quartz, focal length: 76.2 mm, dia: 25.4 mm
LE 3
Lens, plano-convex, G1-quartz focal length: 50.8 mm, dia: 25.4 mm
LE 4
Lens, plano-convex, G1-quartz, focal length: 76.2 mm, dia: 25.4 mm
LE 5,6
Correction lens G1 quartz, dia: 25.4 mm, radius 1: 170.0 mm,
convex cylindrical, radius 2: 230.0 mm, concave spherical,
coating: magnesium fluoride
LE
7
Fabry lens, double-convex, G1 quartz, dia: 38.1 mm focal length: 38.1 mm
MI 1,2
Micrometer, metric, Starrett #463 MP,13-mm head, EDP #52444
ML 1
Mercury lamp GTL3, Germicidal, 12 V, 4W
Mounting: E17 - Edison Intermediate Screw, 17mm
PM 1
Photomultiplier, 30 mm, R7207-01
QW 1
Quartz window, G1 quality 7.62 by 15.24 by 0.48 cm
SL 1
Slit mask, cylindrical sector, dia: 25.4 mm, thickness: 0.038mm
SM
Spherical mirror, radius: 324 mm, ground from pyrex blank of
dimensions 25.4 by 165.1 by 50.8 mm, aluminized reflecting
surface, coated with magnesium fluoride
VL 1
Viewing lens, plano-convex, glass. dia: 15 mm, focal length: 112 mm
VP 1,2
Viewing prism, right-angle, glass 7 by 8 by 7 mm
ZP 1
Zenith prism, right-angle, G1-quartz, 31.75- by 31.75-mm square face
±0.13°
± 0.25°
0 - 270°
MKIII OPERATOR'S MANUAL
2. SYSTEM DESCRIPTION
13
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