Scientech Vector - Manual (Page 4)

4
A
BSORPTION OF
HD A
BSORBING
M
ATERIAL
:
Warning: You must exercise caution when using HD detectors. They exhibit spectral reflection of
between 7% and 18%, of the input power, back out of the aperture. Please refer to
Figure 1 to determine the reflectance for the wavelength you are measuring. These
detectors should be treated as a partial mirror or any other type of reflective optic and
the appropriate caution level observed, especially at the CO
2
wavelength.
A B S O R P T I O N O F H D A B S O R B E R V s . W A V E L E N G T H
5 0
5 5
6 0
6 5
7 0
7 5
8 0
8 5
9 0
9 5
1 0 0
0 1 1 0 1 0 0
W A V E L E N G T H [ M I C R O M E T E R S ]
ABS
O
R
P
T
IO
N [
%
]
C A U T I O N : S P E C U L A R R E F L E C T I O N
Figure 1
Note: HD detectors might show “beam” marks on the absorbing surface. These marks are
characteristic of the material and do not affect the performance of the detector. Do not rub off or
remove the marks. Polishing or cleaning the absorbing surface might change the performance of
the pyroelectric detector.
U
NPACKING AND
S
ET
U
P
:
The detector and accessories are shipped in custom packing materials. All packing materials should be saved
for future damage free shipments.
A ½” diameter mounting post is included. Screw the post into the mounting hole in the body of the detector.
Mount the post to your optical bench or working surface. An optional mounting base, Scientech Model 301-
019, is available for this purpose.
A 3 meter BNC interconnect cable is included for all standard models. A BNC cable is permanently hardwired
to slim profile models. If you are using a Scientech indicator, connect the detector to the indicator with its
cable. Follow the detailed set up instructions that are in the indicator’s instruction manual. If you are not using
a Scientech indicator, operating requirements are contained in this manual.
P
YROELECTRIC
D
ETECTOR
A
BSORPTION
C
HARACTERISTICS
:
Pyroelectric detector models P25, P50, SP25 and SP50 are coated with a special black absorbing material which
provides a very flat spectral response over a broad wavelength band. Pyroelectric detector models PHD25,
PHDX25, PHDX25UV, PHD50, PHDX50, PHDX50UV, SPHD25, and SPHD50 are coated with a special high
damage absorbing material which provides absorption over a broad wavelength band. Models PHF25, PHF50,
SPHF25 and SPHF50 have a partially absorbing, partially reflecting chromium coating. The relative spectral
responses of these detectors are shown in the graph in Figure 2. Please be aware of the absorption differences
between the detector’s calibration wavelength and your operational wavelength. Detailed absorption
information is contained in the charts at the end of this manual.