Isual sprite imager interface and status review
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ISUAL Sprite Imager Interface and Status Review. Stewart Harris. Outline. Imager Overview Interface Details Design and Fabrication Status. Imager Objectives. Provide high temporal and spatial resolution imaging of Sprites and other emissions related to lightning storms

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ISUAL Sprite Imager Interface and Status Review

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Isual sprite imager interface and status review

ISUALSprite Imager Interface and Status Review

Stewart Harris


Outline

Outline

  • Imager Overview

  • Interface Details

  • Design and Fabrication Status

NCKU UCB Tohoku Sprite Imager S. Harris


Imager objectives

Imager Objectives

  • Provide high temporal and spatial resolution imaging of Sprites and other emissions related to lightning storms

  • Provide imaging of aurora and airglow

NCKU UCB Tohoku Sprite Imager S. Harris


Imager optical path

Imager Optical Path

NCKU UCB Tohoku Sprite Imager S. Harris


Optical specifications

Optical Specifications

  • Filters

    • 1:660 - 900 nm

      • notch at 756 - 790

    • 2:762 nm

    • 3:427.8 nm

    • 4:630 nm

    • 5:557.7 nm

    • 6:400 - 900 nm

      • IR/thermal block

NCKU UCB Tohoku Sprite Imager S. Harris


Optical specifications con t

Optical Specifications, con’t.

  • Lens

    • Focal length:61.8 mm

    • Field of View:±10º (h) (20º full angle)

    • Focal ratio:f/1.56

    • Image size:21.4 mm horizontal

    • Spectral band:420 - 780 nm

    • Spot Diameter:on-axis:16 m(80% encircled energy)7º:22 m10º:30 m(Note: Input pixel size:41.8 m)

NCKU UCB Tohoku Sprite Imager S. Harris


Detector specifications

Detector specifications

  • Image Intensifier

    • Type:25 mm Gen II

    • Manufacturer:DEP

    • Photocathode:Super S25, 6 mm quartz window

    • MCP:Single, 100 ns gating

    • Phosphor:P46, fiber optic window2 µs decay time constant

  • Fiber Optic Taper

    • Input diameter25.0 mm

    • Output diameter14.4 mm

    • Ratio1.74 : 1

NCKU UCB Tohoku Sprite Imager S. Harris


Detector specifications con t

Detector specifications, con’t.

  • CCD

    • Type:1024 x 1024, frame transfer

    • Manufacturer:Dalsa, IA-D4

    • Antiblooming:Vertical anti-blooming (VAB)

    • Primary mode:512 x128 (binned 2x2 and masked)

    • Pixel size (unbinned):12 µm x 12 µm

    • Pixel size (binned):24 µm x 24 µm

    • # of Outputs:2

    • Pixel readout rate:8 MHz

NCKU UCB Tohoku Sprite Imager S. Harris


Ccd block diagram

CCD Block Diagram

IA-D4 Image Sensor

Image Area

Output

Storage Area

NCKU UCB Tohoku Sprite Imager S. Harris


Ccd active area masking

CCD Active Area Masking

  • Imaging Earth Limb

    • Narrow, 4:1 Aspect Ratio

    • CCD Active Area

    • Mask applied to f/o taper

    • Size: 1024 x 256 (unbinned)

    • Size: 512 x 128 (binned)

    • FOV: 20° x 5º

Top view of Dalsa CCD with f/o window

NCKU UCB Tohoku Sprite Imager S. Harris


Imager mechanical layout

Imager Mechanical Layout

NCKU UCB Tohoku Sprite Imager S. Harris


Imager connector locator

Imager Connector Locator

J3MCP High Voltage

J4Phosphor High Voltage

J1Imager Electrical Board

J2Front End Electronics

NCKU UCB Tohoku Sprite Imager S. Harris


Imager electrical board functions

Imager Electrical Board Functions

  • Active Electronics

    • Photocathode Power Supply

      • On/off control

      • Gate control from FEC

    • DayLight Sensor Buffer

      • Analog output (left and right)

    • Filter Wheel Motor Driver

      • Stepper motor (2 phases)

      • Position indicators (2 bits)

  • Connections

    • Thermistors

      • TEC hot side

      • Lens (front and rear)

      • Filter Wheel

      • Filter Motor

      • Daylight Sensor

      • Survival (spacecraft)

    • Heater Circuits

      • Lens (front and rear)

      • Filter Wheel

      • Survival (spacecraft)

    • Thermoelectric Cooler (TEC)

      • Power controlled from AEP

    • Stim Source

NCKU UCB Tohoku Sprite Imager S. Harris


J1 imager electrical interface

J1 - Imager Electrical Interface

Reference Designator: J1Location: Imager Electrical Board Interface

Connector Type: SDD44F4000GMating Connector: SDD44M1000G

SDD44F4 -- Face View

NCKU UCB Tohoku Sprite Imager S. Harris


Image intensifier interface

Image Intensifier Interface

Image Intensifier - 25 mm

J3 - 9 pin

J4 - 9 pin

MCP-Out-1kVHV Supply

Phosphor (Anode -6kV) HV Supply

MCP-In GND

Photocathode Power Supply

GATE

FEC Connector

Imager Electrical Board

J1 - 44 pin

NCKU UCB Tohoku Sprite Imager S. Harris


J3 mcp hvps interface

J3 - MCP HVPS Interface

Reference Designator: J3Location: Imager, MCP (stbd) HVPS

Connector Type: SND9F5000GMating Connector: SND9M1000G

SND9F5 -- Face View

NCKU UCB Tohoku Sprite Imager S. Harris


J4 phosphor hvps interface

J4 - Phosphor HVPS Interface

Reference Designator: J4Location: Imager, Phosphor (port) HVPS

Connector Type: SND9F5000GMating Connector: SND9M1000G

SND9F5 -- Face View

NCKU UCB Tohoku Sprite Imager S. Harris


Front end electronics block diagram

Front End Electronics Block Diagram

Correlated Double Sample

A/D Converters

Clock Drivers: Analog SPDT Switches

R/C waveform shaping

Digital I/O

Timing Generator

Based on FPGA

CCD

Preamps

Develops Bias & Clock Voltages

Linear Regulators

Voltage Monitor

J2

NCKU UCB Tohoku Sprite Imager S. Harris


Front end electronics interface

Front End Electronics Interface

Images are transferred to the AEP in data frames,each frame is 128 lines x 512 pixels

  • Data[0..11]

    • 12 bits per pixel

  • PixelClock (PIXCLK)

    • pixel data strobe

  • FrameValid (FRMV)

    • indicates duration of frame

  • LineValid (LINV)

    • indicates duration of line

    • used only during test

  • Busy (BUSY)

    • signals start of EXP

  • Acquire (ACQ)

    • signals start of exposure in Aurora mode

    • signals Event in Sprite mode

  • CommandData (CDI)

    • serial data interface for upload of camera parameters

  • VoltageMonitor (MON)

    • switched analog output

  • Power

    • dc voltages

NCKU UCB Tohoku Sprite Imager S. Harris


J2 fec electronics interface

J2 - FEC Electronics Interface

Reference Designator: J2Location: Imager, rear panel FEC

Connector Type: SDD62F4000GMating Connector: SDD62M1000G

NCKU UCB Tohoku Sprite Imager S. Harris


Data transfer timing

Data Transfer Timing

Line Timing

Tframe = 9.6 ms

Tline = 75 s

Pixel Timing

Tpixel = 125 ns

N > 512

NCKU UCB Tohoku Sprite Imager S. Harris


Image readout order

509

511

510

1

3

512

4

2

1021

513

1023

516

514

515

1024

1022

64513

65021

65023

65024

65022

64516

64514

64515

65027

65025

65533

65535

65534

65028

65026

65536

Image Readout Order

CCD array is illustrated showing the order in which pixels are transferred from Imager to AEP

Line

1

2

127

128

1. Each cell represents one pixel

2. Since the CCD is read from two outputs, the image is split in the middle

NCKU UCB Tohoku Sprite Imager S. Harris


Aurora mode imaging

Aurora Mode Imaging

N - 1

N - 1

N - 1

Read out image

Shift image entire vertical register

Take exposure

The time to shift and readout one image: ~15 ms

Exposure duration can be as long as ~ 1 second

NCKU UCB Tohoku Sprite Imager S. Harris


Frame timing aurora mode

Frame Timing - Aurora Mode

Notes:

1. Images are taken while ACQ held high.

2. Exposure duration specified by parameter EXP 1 ms  TExp  1 sec

3. Frame repetition period specified by parameter REPRATE(TExp + TFrame +TVshift)  TReprate  5 sec

4. Frame readout period is fixed, TFrame = 9.6 ms

5. Vertical shift duration is fixed, TVshift ~ 5 ms (Aurora Mode)

* EXP and VSHIFT are only indicating the relative timing of the exposure period and CCD vertical shift period

NCKU UCB Tohoku Sprite Imager S. Harris


Sprite continuous mode clocking

Sprite Continuous Mode Clocking

N

N + 1

N + 2

N - 1

N + 1

N + 1

Image Area

N

N

N - 2

N - 1

N - 1

N

N

N - 3

N - 1

N - 1

N - 2

N - 2

N - 3

N - 2

Storage Area

N - 2

N - 3

N - 4

N - 3

N - 4

N - 5

N - 4

N - 3

Expose New Image

AND

Shift & Read image from Storage Area

Shift Image & Storage Areas

Transferanother image into Storage Area

Repeat Cycle

Note: Storage area is shifted twice as often

Tframe

NCKU UCB Tohoku Sprite Imager S. Harris


Frame timing sprite continuous

Frame Timing - Sprite Continuous

Notes:

1. Imaging begins when FSW sets mode to Sprite Continuous

2. ACQ signals the Sprite Event occurrence

3. Exposure duration specified by parameter EXP 1 ms  TExp  100 ms

4. Frame repetition period specified by parameter REPRATE( max(TExp , TFrame) + TVshift)  TReprate  100 ms

5. Frame readout period is fixed, TFrame = 9.6 ms

6. Vertical shift duration is fixed, TVshift = 1.3 ms (Continuous Mode)

7. No attempt is made to synchronize EXP with GDelay

NCKU UCB Tohoku Sprite Imager S. Harris


Sprite burst mode clocking

Sprite Burst Mode Clocking

N - 1

N + 2

N + 1

N + 3

N

N

N + 1

N + 2

N - 1

N - 1

N

N + 1

Acquisition Phase

N - 1

N

N - 1

Tframe

N • Tframe

Begin acquisition of N images at leading edge of Event Trigger

Readout Phase

N + 3

N + 2

N + 3

N + 3

N + 1

N + 2

N + 2

N + 3

N

N + 1

N + 3

N - 1

N + 1

N + 2

N

N - 1

N + 1

N + 2

N + 3

N

Treadout

Image readout time ~ (N+1) • Treadout

NCKU UCB Tohoku Sprite Imager S. Harris


Frame timing sprite burst mode

Frame Timing - Sprite Burst Mode

Notes:

1. Continuous fast exposures begin when FSW sets mode to Sprite Burst

2. When ACQ occurs, NPost exposures are taken, then 8 images are readout

3. Exposure duration specified by parameter EXP 1 ms  TExp  100 ms

4. Frame repetition period specified by parameter REPRATE(TExp+ TVshift)  Treprate  10 ms

5. Frame readout period is fixed, TFrame = 9.6 ms

6. Vertical shift duration is fixed, TVshift < 750 s (Burst Mode)

NCKU UCB Tohoku Sprite Imager S. Harris


Principal camera parameters

Principal Camera Parameters

  • Gated operation enable

  • Photocathode gate open/close

  • Set Mode (Aurora, Sprite Continuous, Sprite Burst)

  • Set number of Post Trigger Images, NPOST

    • Only used in Burst Mode (TBD)

  • Set Exposure (EXP) duration

  • Set repetition (REPRATE) period

  • Set photocathode Gate Delay (GDELAY)

  • Note:

    • Dark image acquire accomplished by disabling gated operation,force gate closed, set mode and acquire dark image.

NCKU UCB Tohoku Sprite Imager S. Harris


Camera parameters complete list

Camera Parameters (Complete List)

NCKU UCB Tohoku Sprite Imager S. Harris


Imager design status

Imager Design Status

  • Breadboard fabrication and testing complete

  • Detailed design in progress

    • FEC Electronics Design

      • Schematics: 6 of 7 completed

      • PCB Layout: 5 of 7 completed

    • Imager Electrical Board Design

      • In progress

    • Imager Mechanical Design

      • In progress

NCKU UCB Tohoku Sprite Imager S. Harris


Fec breadboard

FEC Breadboard

A breadboard version of the FEC electronics was built to test the design of clock drivers, preamps, correlated double sample (CDS) circuitry and 12-bit A/D conversion.

NCKU UCB Tohoku Sprite Imager S. Harris


Breadboard camera measurements

Breadboard Camera Measurements

  • Measured system gain

    • 29 e-/ADU

  • Measured readout noise

    • < 50 e- rms

  • CCD full well

    • ~ 120,000 e-

  • Dynamic range

    • > 2400:1

  • Operating Parameters

    • Master clock: 22.5MHz

    • Pixel clock: 7.5 MHz

    • Line clock: 340 kHz

NCKU UCB Tohoku Sprite Imager S. Harris


Breadboard camera image

Breadboard Camera Image

NCKU UCB Tohoku Sprite Imager S. Harris


Imager fabrication status

Imager Fabrication Status

  • Assembly of ETU Imager to start 15 May

    • All PC boards need to be etched by this date

      • FEC Board etch has already started

    • All Mechanical parts to be fabricated by this date

    • Electrical / Electronic (EE) Parts status

      • see next page

    • Optics Parts status

      • see next page

NCKU UCB Tohoku Sprite Imager S. Harris


Ee parts and optics status

EE Parts and Optics Status

NCKU UCB Tohoku Sprite Imager S. Harris


Isual sprite imager interface and status review

The End

NCKU UCB Tohoku Sprite Imager S. Harris


Pcb assembly drawing

PCB Assembly Drawing

FEC Analog Processor PC Board: Assembly Dwg. 8747-A4A

Return

NCKU UCB Tohoku Sprite Imager S. Harris


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