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MEIDEX - Crew TutorialInstrumentation Adam D.
Devir, MEIDEX Payload Manager
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Payload Instrumentation

• Sekai RSC-310
• General View
• Components and Interfaces
• Operating Procedures
• Sekai ADVCR-101
• General View
• Basic Interfaces
• Operating Procedures
• Vibration Tests
• Instrumentation and Avionics on AMP

• Introduction
• Payload Instruments
• Xybion IMC
• General View
• Components
• Basic Interfaces
• Baffle, Optical Bench and Truss Mechanism
• Optics
• Principle of Operation
• The MCP
• Command Tree
• Operating Procedures

3
Introduction

• The Mediterranean Israeli Dust Experiment
  (MEIDEX) will fly on a shared STS mission as a
  complex secondary payload. Its primary mission
  objective is to monitor and provide by a Xybion
  Intensified Multispectral Camera (IMC-201)
  radiometric image data of atmospheric desert
  aerosol plumes. A secondary wide field of view
  (FOV) camera will be used to monitor the larger
  area surrounding the narrow FOV of the
  radiometric camera. Imaging data will be recorded
  on an on-board digital VCR for analyses. Using a
  portable laptop computer, the astronaut in the
  shuttle will control the camera operation, VCR
  record status, and experiment pointing during the
  course of the mission.

4
Payload Instruments

• Payload instruments
• Xybion Intensified Multispectral Camera (IMC)
  serves as the main
• radiometric scientific equipment
• SEKAI RSC-310 Wide Field of View (WFOV) camera
  serves at a view finder color camera
• SEKAI ADVCR-101 digital VCR (3 units)
• All payload instrumentation is located in HH
  canister (with 5 extension ring)
• The Xybion IMC-201 and the SEKAI RSC-310 are on
  the movable Truss.
• The 3 SEKAI ADVCR-101 are located under the
  Avionics Mounting Plate (AMP) which is 6 above
  the Lower End Plate (LEP) of the canister.
• On the AMP are located the following avionics are
  
• The Electrical Power Supply (EPS) with the Sekai
  CCD P/S.
• Control and Data Handling unit (CDH).
• The Junction Box.

5
Xybion IMC - General View
6
Xybion IMC - Components
7
Xybion IMC - Basic Interfaces
8
Xybion IMC-210 - Baffle Design
9
Lens Support Bracket and Optical Bench
10
Optical Bench in The Truss Mechanism- Drive Train
Side
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Optical Bench in The Truss Mechanism- Brake Side
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Truss Mechanism - Top View
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Optical Bench and Truss Mechanism in the
Canister Assembly
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The HH Canister on the Bridge
MEIDEX
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The HH Canister on the Bridge
MEIDEX
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Xybion IMC-201 - Optics
The Hamamatsu A4869 lens has a focal length of is
50.4mm (F/3.5). The lens is composed of 5
elements (Fluorite and Fused Silica) in 5 groups.
Total transmittance of the lens is gt70. The
total FOV of the lens is 13.93o (H) x 10.66o (V).
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Xybion IMC-201 - Principle of Operation
18
Xybion IMC-201 - Principle of Operation

• Photons are passing through the filter and
  hitting the photocathode (PC)
• The PC is converting the photons to
  photo-electrons.
• The quantum efficiency of the PC varies from20
  in the UV 200nm) to 2 in the NIR (850nm) - see
  next page.
• The electrons are accelerated from the PC by a
  gated voltage difference - VPC towards the
  negative plate of the Multi-Channel Plate (MCP)
  that is at voltage of about -800V.
• The gating of this voltage difference turns the
  PC negative in relation to the MCP thus allowing
  the electrons to reach the MCP during the gate
  interval
• The gating pulse is rectangular with varying
  width that varies from 50nsec to 4msec.
• The gating pulse is synchronized with the
  position of the filter wheel in such way that it
  coincides with the exact overlapping of the
  filter diameter (25mm) with that of the PC.

19
Xybion IMC-201 - Quantum Efficiency
20
Xybion IMC-201 - Principle of Operation

• The MCP amplifies the number of the electrons as
  a function of the voltage difference between its
  two sides - see next slide
• The relation between the voltage difference and
  the amplification of the number of electrons is
  shown in the next slide as a function of the
  voltage - V applied to the MCP and the parameter
  a that is the ratio between the MCP channel
  length to the channel diameter.
• The value of a is in common MCP equal to 40.
• The gain of the MCP is controlled by setting the
  gain of the camera to certain percentage of the
  maximal gain that depends on the maximal allowed
  voltage.
• The maximal voltage of the MCP in Xybion camera
  is 890V
• In MEIDEX main mission the gain of the Xybion
  camera will be adjusted to be G65. This means
  that the MCP voltage will be 580V. According to
  the gain curves of the MCP with a 40 the
  amplification of the Xybion will be 200.
• During the calibration process we discovered that
  for an increase of 5 in the value of G (from 65
  to 75) the amplification is increase by a factor
  of 2.
• This fact is confirmed by the amplification
  curve.

21
The MCP - Schematics and Operating Principle
22
The MCP - Gain Factor
AMPLIFICATION
23
Xybion IMC-201 - Principle of Operation

• Once the electrons leave the MCP they are
  accelerated by 6KV to the photoanode.
• The photoanode is a P-20 phosphor anode that has
  a peak response (radiation) at 550nm.
• The photons emitted from the photoanode are
  detected by a CCD. At this wavelength the CCD is
  less sensitive to temperature changes.
• Between the CCD and the photoanode there is a
  fiber-optics minifier that reduces the diameter
  of the image that comes from the photoanode
  (Dia.1) to the size (diagonal) of the CCD
  (2/3).

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Xybion IMC-201 - Principle of Operation
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Xybion IMC-201 - Technical Specifications
CCD Sensor (786H x 493V) RS-170, NTSC (30
frames/sec) Dynamically determined exposure
time 50 ns to 4.0 ms (for rotating filter) in
50 ns steps 10 decades of light level input,
Auto-gated Spectral Response 200-810nm (U Gen II
UV photocathode) Sensitivity not less than
1x10-6 fc (Lumens/ft2) for photopic source (no
filter) 18mm Gen II MCP Intensifier with 30
lp/mm Intensifier gain 0-15,000 luminance gain
(0 to 100 of the maximal gain) in 255
steps P-20 Phosphor Anode (550nm peak
response) Image annotation 1) Date 2)
Time 3) Exposure time 4) Gain 5)
Temperature of the CCD 6) Video frame
(N/A) 7) External event counter (N/A) () For
stationary filer wheel the maximal exposure time
is 33.3 msec. () Overcast night sky have
Illuminance of 1x10-5 to 1x10-4 fc (Lumens/ft2)
26

Xybion IMC-201 - The Command Tree
27
Xybion IMC-201 - Command Tree

• The Xybion camera is controlled via a back-panel
  key-pad (N/A in MEIDEX) or via RS-232.
• The main commands that are delivered to the
  camera are shown in the following command tree.
• All commands that are shown in frames are
  delivered to the camera via the Xybion Command
  Display in the PGSC4310 Software (see following
  explanations).

boxes
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Xybion IMC-201 - Full Image layout
1
5
6
Filter Exposure time (msec) Gain () CCD Temp.
(Co) Date (mm/dd/yy) Time (hhmmss) Coded data
2
3
4
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Xybion IMC-201 - Operating Procedures
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Xybion IMC-201 - Operating Procedures

• The Xybion camera is controlled via a back-panel
  key-pad (N/A in MEIDEX) or via RS-232.
• The main commands that are delivered to the
  camera were shown in the following command tree.
• These commands will be delivered to the Xybion
  camera through the PGSC4130 software by the use
  of
• The Relay Commanding Display
• The Xybion Command Display
• The Command Generator Display via the line
  XYBIONCMD

34
Xybion IMC-201 - Switching the camera ON

• The Xybion camera is switched On via the PGSC4130
  software by the use of the Relay Commanding
  Display
• Pointing on the command Xybion-On.
• Pressing the mouse left button.
• A message RELAY5 ON will appear.
• Pressing Xmit button.
• The white dot will turn green

35
Xybion IMC-201 - Operating The Camera

• To select a command to the Xybion camera, click
  on the command name.
• Enter the parameter value (if the command has a
  parameter).
• Click the Xmit button to send the command.

36
Xybion IMC-201 - More Operating Procedures

• Commands and their parameter(s) value(s) are
  entered manually in the command buffer display.
• For example the Configuration of the Date in the
  Xybion camera by entering the Month, Day, Year
  settings.
• Clicking the Xmit button sends the command.

37
Xybion IMC-201 - Switching the camera OFF

• The Xybion camera is switched Off via the
  PGSC4130 software by the use of the Relay
  Commanding Display
• Pointing on the command Xybion-On.
• Pressing the mouse left button.
• A message RELAYK5 OFF will appear.
• Pressing Xmit button.
• The white dot will turn white

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Sekai RSC-310 CCD
39
Sekai RSC-310 CCD - Components and Interfaces
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Sekai RSC-310 CCD - Operating Procedures
41
Sekai RSC-310 CCD - Operating Procedures

• The Sekai camera is controlled via commands that
  are delivered to the camera through the PGSC4130
  software by the use of
• The Relay Command Display
• The Sekai camera operates without any additional
  command after it is switched on.

42
Sekai RSC-310 - Operating Procedures

• The Sekai camera is switched On via the PGSC4130
  software by the use of the Relay Commanding
  Display
• Pointing on the command Sekai-On.
• Pressing the mouse left button.
• A message RELAYK4 ON will appear.
• Pressing Xmit button.
• The white dot will turn green

43
Sekai RSC-310 - Operating Procedures

• The Sekai camera is switched Off via the PGSC4130
  software by the use of the Relay Commanding
  Display
• Pointing on the command Sekai-Off.
• Pressing the mouse left button.
• A message RELAYK4 OFF will appear.
• Pressing Xmit button.
• The white dot will turn white

44
Sekai ADVCR-101
45
Sekai ADVCR 101 - Components
46
Sekai ADVCR 101- Basic Interfaces
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Sekai ADVCR-101 - Operating Procedures
48
Sekai ADVCR-101 - Operating Procedures

• The Sekai ADVCR-101 is controlled via commands
  that are delivered to the camera through the
  PGSC4130 software by the use of
• The Relay Command Display

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Sekai ADVCR-100 - Operation Procedures

• The Sekai ADVCR-100 (1) is switched On via the
  PGSC4130 software by the use of the Relay
  Commanding Display
• Pointing on the command Vcr1-On.
• Pressing the mouse left button.
• A message RELAYK1 ON will appear.
• Pressing Xmit button.
• The white dot will turn green
• The ADVCR is now in STBY mode.

50
Sekai ADVCR-100 - Operation Procedures

• The Sekai ADVCR-100 (1) is switched to Record
  mode via the PGSC4130 software by the use of the
  Relay Commanding Display
• Pointing on the command Record1-On.
• Pressing the mouse left button.
• A message RELAYK2 ON will appear.
• Pressing Xmit button.
• The white dot will turn green

51
Sekai ADVCR-100 - Operation Procedures

• The Sekai ADVCR-100 (1) is switched to Stop
  Record mode via the PGSC4130 software by the use
  of the Relay Commanding Display
• Pointing on the command Record1-Off.
• Pressing the mouse left button.
• A message RELAYK2 OFF will appear.
• Pressing Xmit button.
• The white dot will turn white
• The ADVCR is no in the STBY mode

52
Sekai ADVCR-100 - Operation Procedures

• The tape in the Sekai ADVCR-100 (1) is now
  Unthreaded via the PGSC4130 software by the use
  of the Relay Commanding Display
• Pointing on the command Unthrd1-On.
• Pressing the mouse left button.
• A message RELAYK3 ON will appear.
• Pressing Xmit button.
• The white dot will turn green

53
Sekai ADVCR-100 - Operation Procedures

• The Sekai ADVCR-100 (1) is switched Off via the
  PGSC4130 software by the use of the Relay
  Commanding Display
• Pointing on the command Vcr1-Off.
• Pressing the mouse left button.
• A message RELAYK1 Off will appear.
• Pressing Xmit button.
• The white dot will turn white

54
Sekai ADVCR-100 - Operation Procedures

• The Unthread Relay has to be restored to its
  initial position. This is done via the PGSC4130
  software by the use of the Relay Commanding
  Display
• Pointing on the command Unthrd1-Off.
• Pressing the mouse left button.
• A message RELAYK3 Off will appear.
• Pressing Xmit button.
• The white dot will turn white

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Vibration Tests
56
Instrumentation - Vibration Tests

• Random Vibration Qualification Level (CARS Table
  3.6)
• Xybion Camera with lens and baffle were vibrated
  to CARS Qualification Levels
• Sekai Camera with lens were vibrated to CARS
  Qualification Levels
• All three Sekai ADVCR were vibrated to CARS
  Qualification Levels
• Test was at NASAs facility

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Instrumentation and Avionics on LEP
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END Crew Tutorial - Instrumentation