PI
PI-4820 Spot Scanner
Features:
● Visible or IR Source
● Raster and Line Scan Capabilities for Cross-talk and Active Area Measurements
● Full spectral Range Coverage with Optional/Interchangeable Optics
● User Friendly Software
● Selectable Scan Field Size
Simple flood radiometric measurements are no
longer sufficient in today's high performance
device market. Sophisticated customers are
requiring tighter specifications on photosensitive
devices and specifying performance
requirements based on how photosensitive
devices need to perform in their system.
Photosensitive devices now have requirements
specifying spatial performance at or near the
blur circle of the systems that they are being
used in. Single line spot scans may no longer be
sufficient to demonstrate a device's ability to
meet specifications.
Pulse Instruments' Spot Scanner is a
two-dimensional spot scanning instrument. The
scanner provides detailed spatial responsivity
maps for photosensitive regions of these devices.
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Almost any photosensitive device, from solar
cells to Infrared Focal Plane Arrays can be
examined. The information obtained can be used
to determine actual optical area, uniformity,
matching and crosstalk, using spot sizes, which
are similar in size to the end system. The spot
scanner operates by focusing a small spot of
energy on the device being tested. This spot is
rastered or "moved" across the device under
test (DUT). The output of the DUT is digitized
and recorded, resulting in a two-dimensional
image of the device's photo responsivity.
The spot scanner consists of: an optical stimulus,
such as a blackbody source or a laser; an optical
box containing focusing optics and scan mirrors
and scan mirror control electronics. These are
all combined into an integrated instrument.
Individual items can be purchased separately
and customized to match your application's
specific requirements.
PI
PI-4820 Spot Scanner
Specifications
OPTICAL SUBSYSTEM
Wide Field Midrange:
Maximum image size: 128 x 128 points.
Maximum field size at focal plane.5"X.5", 38% system
transmission in spectral band 2 to 5.5 µm. Minimum
achievable spot size for the following scan field sizes:
● *.5"x.5" -90 µm spot diameter
● -.25"x.25" - 40 µm spot diameter
● -.125"x.125" and smaller - 30 µm spot diameter
Selectable scan field sizes:
● .5"x.5", 4 mil step size
● .25"x.25", 2 mil step size ,,
● .l25"x.125", 1 mil step size
● .063"x.063", .5 mil step size
● .032"x.032", .25 mil step size
● Other sizes available upon request
Working Distance: 1.75 inches from top of objective
lens to focal plane.
Test Device Platform: Manual X, Y, Theta
adjustment stage with dewar mounting plate.
Illumination Sources: Blackbody for infrared
spectral ranges. Laser, global or arc sources for
visible spectral ranges.
8:1 reduction in spot size from aperture to projected
image on focal plane.
Focus: 2 inch Z travel, manual focus knob,
cornputer-assisted, best focus determination.
Wide Field Longwave Infrared Optics:
Maximum field size at focal plane: .5"x.5", 10% system
transmission in spectral band 7.5 to 10 µm. Minimum
achievable spot size for the following scan field sizes:
● *.5"x.5" - 85 pm spot diameter
● *.26'x.26' and smaller - 50 µm spot diameter
SCANNING SUBSYSTEM
General Scanner, DX2001 scan controller and mirrors.
Raster generation electronics for DX2001.
Real-time display of data as it is collected. The time to
raster on image is dependent on the scan field size and
certain acquisition parameters.
Typical scan times range from 10-40 seconds.
Raster, single line, and stare capability.
OPTICS
Visible Optics: f2.9 lens
ELECTRONIC SUBSYSTEM
Maximum field size at focal plane: .35"x.35", 67%
transmission in spectral band 500 to 800nm.
Minimum achievable spot size, 19 µm, depending on
Radiation Source and filter.
The system is designed to be used in conjunction with the
Pulse Instruments Model PI-4005 Data Acquisition
System which is described fully on its own data sheet.
Other methods or existing data acquisition systems can
also be integrated with the test head.
Infrared Optics: f2.0 lens
Narrow Field Midrange:
Uniform field size at focal plane: .03"x.03", 81 %
transmission in spectral band 2 to 5.5µ. Minimum
achievable spot size: 19-35 µm, depending on
Radiation Source and filter.
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Data acquisition is synchronized with scan mirror
electronics during 2D raster or single line acquisitions.
Selectable synchronization with chopped source or user
selected sampling rates for single measurements.
Custom preamps can be provided as an option.
PI
PI-4820 Spot Scanner
Ordering Information
Model No.
PI-4820
Description
Spot Scanner Test Head - Flying Spot Scanning Test Head intended to provide
a diffraction limited spot for the test of CCD'S, IR Detectors and Focal Plane
Arrays. Includes optical assembly, collimater, X-Y scanning mirrors, provisions
to mount bandwidth limiting filter, dewar mount and alignment mechanism,
and scan mirror control electronics. Optical box also includes focusing optics
(select from below). These items are all combined into an integrated instrument.
The self-contained subsystem includes a console with power distribution and
optical isolation bench. The PI-4820 can operate as an integral part of the
System 4700 Test System, or can be used as a stand alone test head. Provisions
are included for all options listed below. Includes IBM PC compatible, control
software for set up and real time control over IEEE-488 BUS. Select either the
48805 Blackbody Source for IR applications or the 48201 Visible Light Source
for visible applications. See PI-4005 Data Acquisition System for preamplifier
and data acquisition information.
For larger fields - Consult Factory
Accessories and Options for IR Applications
Model No.
48801
Description
Chopper - Programmable variable frequency radiation modulator features high
frequency stability using closed loop digital control. Mounts directly to the
blackbody front panel. Includes one Chopper Wheel from list below: (For other
frequencies consult factory.)
48001-2
Chopper with 1 to 250 Hz Frequency (2 blades)
48001-4
Chopper with 1 0 to 1 kHz Frequency (8 blades)
48001-16
Chopper with 1 0 to 2 kHz Frequency (6 blades)
48001-40
Chopper with 1 0 to 5 kHz Frequency (40 blades)
48001-160
Chopper with 1 00 to 20 kHz Frequency (160 blades)
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PI
48003
FILTER WHEEL -- Motor driven programmable filter wheel with eight
positions for 1" diameter filters (clamping rings only provided). The wheel is
mounted in front of the aperture wheel on the blackbody. The wheel position is
selected from either the MODEL 48804 RADIATION FLUX SOURCE
CONTROLLER front panel, or via the PI-RAD control software. Provides
radiation in selected wavelength bands. For filters consult factory.
48005
Blackbody Source - One inch blackbody source, including 48804 Radiation Flux
Source Controller and Aperture Wheel.
48005-1
Blackbody with 1" cavity and 50 to 1OOO C temperature range
48005-3
Blackbody with 1" cavity and 50 to 1200 C temperature range
48211
Wide Field Mid-Range IR Lens - f/2 with 2" back focal length to match f/2
clearance and 1.5" working distance of Versa-Dewar.
48212
Narrow Field Mid-Range IR Lens - f/2 with 2" back focal length to match f/2
clearance and 1.5' working distance of Versa-Dewar.
48213
Wide Field Long-Wave IR Lens - f/2 with 2" back focal length to match f/2
clearance and 1.5" working distance of Versa-Dewar.
Accessories for Visible Applications
Model No.
Description
48210
Visible Lens - f/2 with 2" back focal length to match f/2 clearance and 1.5"
working distance of Versa-Dewar.
48201
Uniform Visible Light Source.
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