clarreo uw harvard team proposed iip activities with description of underlying research n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
CLARREO UW & Harvard Team Proposed IIP Activities (with description of underlying research) PowerPoint Presentation
Download Presentation
CLARREO UW & Harvard Team Proposed IIP Activities (with description of underlying research)

Loading in 2 Seconds...

play fullscreen
1 / 32

CLARREO UW & Harvard Team Proposed IIP Activities (with description of underlying research) - PowerPoint PPT Presentation


  • 91 Views
  • Uploaded on

CLARREO UW & Harvard Team Proposed IIP Activities (with description of underlying research). Fred Best. University of Wisconsin. CLARREO Meeting at NIST 12 June, 2008. Topics. CLARREO IIP Scope Proposed IIP Technologies with Background Development Summary

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'CLARREO UW & Harvard Team Proposed IIP Activities (with description of underlying research)' - sancha


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
clarreo uw harvard team proposed iip activities with description of underlying research

CLARREOUW & Harvard TeamProposed IIP Activities(with description of underlying research)

Fred Best

University of Wisconsin

CLARREO Meeting at NIST

12 June, 2008

topics
Topics
  • CLARREO IIP Scope
  • Proposed IIP Technologies with Background Development Summary
    • On-orbit Absolute Radiance Standard (OARS)
    • On-orbit Cavity Emissivity Module (OCEM)
    • On-orbit Spectral Response Module (OSRM)
    • Dual Absolute Radiance Interferometers (DARI)
  • TRL Progressions and Program Milestones

CLARREO Meeting at NIST 12 June 2008

Proposed IIP Activities & Required NIST Capabilities for CLARREO

a new class of advanced accuracy satellite instrumentation aasi for the clarreo mission
A New Class of Advanced Accuracy Satellite Instrumentation (AASI) for the CLARREO Mission
  • The objective of the proposed IIP work is to develop and demonstrate the technologies necessary to measure IR spectrally resolved radiances with ultra high accuracy (< 0.1 K 3-sigma brightness temperature at scene temperature) for the CLARREO benchmark climate mission.

CLARREO Meeting at NIST 12 June 2008

Proposed IIP Activities & Required NIST Capabilities for CLARREO

clarreo radiometric performance
CLARREO Radiometric Performance
  • Estimated 3-sigma calibrated brightness temperature uncertainty shown as a function of scene brightness temperature, based on use of the AASI.

The uncertainty of the blackbody radiating temperature (45 mK, 3-sigma) dominates, except for large wavenumbers at cold temperatures where the assumed telescope temperature change of 20 mK between earth and calibration views becomes important. We assumed an emissivity of 0.999 with 0.0006 uncertainty and a blackbody temperature of 300 K, while the instrument is at 285 K.

CLARREO Meeting at NIST 12 June 2008

Proposed IIP Activities & Required NIST Capabilities for CLARREO

clarreo viewing configuration
CLARREO Viewing Configuration

Developed under

this IIP

  • Viewing configuration providing immunity to polarization effects.

CLARREO FTS Scene Mirror Provides Earth and Space Views as well as Views to Targets Involving Technologies Developed Under this IIP, That Give Unprecedented Absolute Calibration Accuracy on-orbit.

CLARREO Meeting at NIST 12 June 2008

Proposed IIP Activities & Required NIST Capabilities for CLARREO

proposed technologies oars
Proposed Technologies (OARS)
  • On-orbit Absolute Radiance Standard (OARS) that uses multiple phase change material signatures to establish absolute temperature knowledge to 10 mK throughout the lifetime of the satellite. The OARS is a source that will be used to maintain SI traceability of the radiance spectra measured by separately calibrated dual interferometer sensors.

CLARREO Meeting at NIST 12 June 2008

Proposed IIP Activities & Required NIST Capabilities for CLARREO

slide7

UW-SSEC Developed GIFTS EDU BlackbodyPerformance Significantly Exceeds Specifications

GIFTS Engineering Development Unit

Blackbody

Controller

Card

Blackbody (2)

1” Cavity

Aperture

Specification

As Delivered

Key Parameter

Thermofoil

Heater

Aluminum

Enclosure

Aluminum

Cavity

Thermistor

Temperature

Sensors

Support

Tube/

Thermal

Isolator

CLARREO Meeting at NIST 12 June 2008

Proposed IIP Activities & Required NIST Capabilities for CLARREO

slide8

GIFTS Blackbody

1” Cavity

Aperture

Aluminum

Enclosure

Aluminum

Cavity

Thermofoil

Heater

Cavity

Surface

Aeroglaze

Z306

Thermistor

Assemblies (5)

Glass-filled Noryl Cavity Support Tube / Thermal Isolator

Mechanical

Support for

Enclosure

Glass-filled

Noryl Base

Base

Thermistor

CLARREO Meeting at NIST 12 June 2008

Proposed IIP Activities & Required NIST Capabilities for CLARREO

a new approach compared to the traditional laboratory approach
A new approachcompared to the traditional laboratory approach

Blackbody

Cavity

A

Temperature

Probe

A

Heater

  • View AA -
  • (expanded)

Blackbody

Cavity

Melt Materials

(3 different)

Outer insulation not shown

Fixed Point

Reference Material

Melt Material

Temperature

Sensors (3)

Temperature Controlled Bath

Traditional Laboratory Calibration Scheme

Melt Signature Configuration

(based on long-term thermal stability at melt temperatuere)

(based on temperature signature while

transitioning through melt temperature)

CLARREO Meeting at NIST 12 June 2008

Proposed IIP Activities & Required NIST Capabilities for CLARREO

question
Question
  • Can a melt material mass of < 1/1000th of the cavity mass give the accuracy needed for CLARREO?
  • YES!

CLARREO Meeting at NIST 12 June 2008

Proposed IIP Activities & Required NIST Capabilities for CLARREO

anatomy of a melt signature
Anatomy of a Melt Signature

Cavity response if no melt material present

With melt complete, cavity temperature rises

Temperature

melt plateau

When Ga melt material is present, the added power goes into changing the phase to liquid - no cavity temperature rise.

Time

Cavity held at constant temperature

Constant ∆Power Applied

Ga Melt

CLARREO Meeting at NIST 12 June 2008

Proposed IIP Activities & Required NIST Capabilities for CLARREO

ssec engineering test cavity configured for melt tests
SSEC Engineering Test Cavity(configured for melt tests)

1 cm

Thermistor

Melt Material

Thermistor potted into custom housing then threaded into aluminum cavity.

0.38 g of Ga melt material placed into thermistor housing modified with stainless steel sleeve and nylon plug.

Blackbody Cavity

CLARREO Meeting at NIST 12 June 2008

Proposed IIP Activities & Required NIST Capabilities for CLARREO

gallium melt repeatability
Gallium Melt Repeatability

20 mK

Zoom view

  • Ramps with similar melt times match very closely
  • Ramp 66 was 8 months after other ramps
  • Ramps 38 and 41 were done inside the chamber; the rest outside

CLARREO Meeting at NIST 12 June 2008

Proposed IIP Activities & Required NIST Capabilities for CLARREO

melt time comparisons
Melt Time Comparisons

CLARREO Meeting at NIST 12 June 2008

Proposed IIP Activities & Required NIST Capabilities for CLARREO

longer melt time better accuracy
Longer Melt Time = Better Accuracy

20 mK

*

*

Asymptote of Model Fit is within 1mK of Ga Melt Point

Ga Melt

CLARREO Meeting at NIST 12 June 2008

Proposed IIP Activities & Required NIST Capabilities for CLARREO

cavity gradient very low during melt
Cavity Gradient Very Low During Melt

Circumferential

Heater

Aluminum

Blackbody

Cavity

-

(HBB-B

HBB-A)

Thermistor

HBB-B

Ga Melt

Material

Thermistor

HBB-A

1.2 mK

∆ Temp. ( C)

Temperature gradient between spatially separated temperature sensors only ~1.2mK, even during “fast” 4800 sec. melt.

CLARREO Meeting at NIST 12 June 2008

Proposed IIP Activities & Required NIST Capabilities for CLARREO

thermal modeling
Thermal Modeling

A thermal model was developed and tuned to agree with test data, and then used to:

  • Explore relationships between important system parameters and melt behavior.
    • Heat leak effects due to cabling.
    • Mass and aspect ratio of melt material.
    • Ramp Power.
    • Thermal Resistance between melt material and cavity.
    • Thermal Resistance between thermistor and melt material.
  • Explore and predict the impact of variations in the external temperature environment on Melt Signatures.
  • Predict and optimize melt signature behavior of different materials.

Axisymmetric Thermal Model

CLARREO Meeting at NIST 12 June 2008

Proposed IIP Activities & Required NIST Capabilities for CLARREO

measured melt signatures using gifts bb configuration
Measured Melt Signatures(using GIFTS BB Configuration)

-40 °C

-20 °C

0 °C

20 °C

40 °C

-38.87 °C

Mercury

0.00 °C

Water

29.77 °C

Gallium

Mercury Melt (test data)

Water Melt (test data)

Gallium Melt (test data)

Approach Exponential Fit

Mercury Melt = -38.87 °C

Temperature [°C]

Water Melt = 0 °C

Gallium Melt = 29.765 °C

Thermistor

Temperature

Thermistor

Temperature

Thermistor

Temperature

Time [s]

Melt Signatures Provide Absolute Temperature Calibration Accuracies Better Than 10 mK

CLARREO Meeting at NIST 12 June 2008

Proposed IIP Activities & Required NIST Capabilities for CLARREO

implementation for clarreo gifts blackbody embodiment
Implementation for CLARREO(GIFTS Blackbody Embodiment)
  • Small quantities of Water, Gallium, Mercury, and possibly more materials are imbedded in the blackbody cavity, providing three or more known temperature reference points.
  • The thermistors will be interleaved in the cavity between these reference materials.
  • Temperature calibration points are established by sequentially passing through the melt plateaus of the reference materials.
  • During the melt plateaus, the thermistor resistances corresponding to the phase change points are measured.
  • The thermistors are fully characterized over the entire range of temperatures represented by the three (or more) reference materials, by using the traditionally obtained Steinhart & Hart Coefficients.

CLARREO Meeting at NIST 12 June 2008

Proposed IIP Activities & Required NIST Capabilities for CLARREO

benefits of this novel approach
Benefits of This Novel Approach
  • Absolute temperature calibration is provided on-orbit on-demand.
  • Scheme provides temperature calibration of all the blackbody cavity thermistor sensors, over a significant temperature range – allowing normal blackbody operation at any temperature within this range.
  • Concept is simple and requires very little mass.
  • Implementation requires straight-forward modification of an existing flight hardware design (GIFTS).
  • Very high accuracy is obtained – each temperature calibration point associated with a melt material can be established to well within 10 mK, and more accuracy is obtainable with longer melt times.

CLARREO Meeting at NIST 12 June 2008

Proposed IIP Activities & Required NIST Capabilities for CLARREO

iip focus for oars
IIP Focus for OARS
  • Optimize Containment System used for the Miniature Phase Change Cells.
    • Surface Tension dominating Gravitational effects.
    • Melt signature enhancement.
    • Containment and Melt Material Compatibility.
      • Melt contamination from Dissolution
      • Liquid Metal Embrittlement of containment system
  • Demonstrate performance after accelerated life testing to simulating full mission lifetime.
  • Optimize melt algorithm refinements.
  • Refine thermal modeling.

CLARREO Meeting at NIST 12 June 2008

Proposed IIP Activities & Required NIST Capabilities for CLARREO

proposed technologies ocem
Proposed Technologies (OCEM)
  • On-orbit Cavity Emissivity Module (OCEM) that directly determines the on-axis emissivity of the OARS throughout the instrument lifetime on-orbit. Two versions will be developed:
    • one using a quantum cascade laser source (Harvard), and
    • one based on a heated halo source (Wisconsin).

Harvard QCL Approach

UW Heated Halo Approach

CLARREO Meeting at NIST 12 June 2008

Proposed IIP Activities & Required NIST Capabilities for CLARREO

iip focus for ocem
IIP Focus for OCEM
  • Quantum Cascade Laser Source OCEM (Harvard)
    • Optimize power coupling of the QCL to the infrared optical fiber.
    • Embed detectors directly into the blackbody cavity wall allowing a direct measurement of surface emissivity.
    • Conduct end-to-end Interferometer tests to determine cavity emissivity.
  • Heated Halo Source OCEM (Wisconsin)
    • Configure system to be integrated into the 1” OARS Blackbody.
    • Conduct end-to-end interferometer tests with OCEM to verify required noise performance and stability.

CLARREO Meeting at NIST 12 June 2008

Proposed IIP Activities & Required NIST Capabilities for CLARREO

proposed technologies osrm
Proposed Technologies (OSRM)
  • On-orbit Spectral Response Module (OSRM) that uniquely determines the spectral instrument line shape of the interferometers over the lifetime of the instrument on-orbit.

Signature of the instrument lineshape superimposed on a blackbody spectrum. The baseline spectrum is that of a room temperature blackbody. The monochromatic radiation from a QCL at 1263 cm-1 is directed into the cavity and the resulting spectrum resolved at 0.5 cm-1 reveals the spectrometer lineshape.

CLARREO Meeting at NIST 12 June 2008

Proposed IIP Activities & Required NIST Capabilities for CLARREO

iip focus for osrm
IIP Focus for OSRM
  • Develop OSRM Cavity with optimized diffuse reflectivity.
  • Develop appropriate stable QCL power driver allowing the long integration times needed to determine the ILS to the desired level of precision.
  • Conduct end-to-end interferometer testing to verify performance and stability.

CLARREO Meeting at NIST 12 June 2008

Proposed IIP Activities & Required NIST Capabilities for CLARREO

proposed technologies dari
Proposed Technologies (DARI)
  • Dual Absolute Radiance Interferometers (DARI) for measuring spectrally-resolved radiances over a major part of the thermal infrared spectral domain. Fourier Transform Spectrometer (FTS) systems with strong flight heritage will be configured for detailed performance testing and design trades as part of this IIP.
    • UW Focus - High Performance FTS
    • Harvard Focus - Far IR

CLARREO Meeting at NIST 12 June 2008

Proposed IIP Activities & Required NIST Capabilities for CLARREO

dari iip configurations focus
DARI IIP Configurations & Focus

CLARREO Meeting at NIST 12 June 2008

Proposed IIP Activities & Required NIST Capabilities for CLARREO

clarreo iip high performance fts absolute radiance interferometer
CLARREO IIP High Performance FTS Absolute Radiance Interferometer

CLARREO Meeting at NIST 12 June 2008

Proposed IIP Activities & Required NIST Capabilities for CLARREO

clarreo iip far ir fts absolute radiance interferometer
CLARREO IIP Far IR FTS Absolute Radiance Interferometer

CLARREO Meeting at NIST 12 June 2008

Proposed IIP Activities & Required NIST Capabilities for CLARREO

iip high performance fts subsystem key elements
IIP High Performance FTS Subsystem - Key Elements

The High Performance FTS subsystem to be developed by UW-SSEC will include an interferometer with diode laser-based metrology and multiple beamsplitter options (at least ZnSe and Si), a detector/dewar subassembly, and a small pulse-tube mechanical cooler, all chosen for their strong spaceflight heritage such that detailed performance testing can be conducted on a subsystem with a clear path to space.

  • FTS: GOSAT/TANSO ACE-FTS Hybrid adapted for Far IR
  • representative of flight model interferometer requirements
  • commercial ABB electronics.
  • Cooler: NGST Pulse Tube Microcooler
  • To minimize cost and schedule NGST will provide, on a temporary basis, a micro-compressor and tactical electronics while fabricating a coaxial cold head, reservoir tank and inertance line as part of the program. These subassemblies will be assembled and performance testing conducted to validate the cooler system operation.
  • Low power, low mass, low vibration, long life
  • Detector/Dewar Assembly
  • Single dewar
  • Cold-finger/bellows interface to cooler
  • Similar to existing UW-SSEC S-HIS detector/dewar subassembly
  • single cold field stop, refractive elements to focus the aperture stop onto the detectors
  • at least two semi-conductor detectors chosen for high linearity.

CLARREO Meeting at NIST 12 June 2008

Proposed IIP Activities & Required NIST Capabilities for CLARREO

iip technology advancement
IIP Technology Advancement

CLARREO Meeting at NIST 12 June 2008

Proposed IIP Activities & Required NIST Capabilities for CLARREO

trl progression and program milestones
TRL Progression and Program Milestones

CLARREO Meeting at NIST 12 June 2008

Proposed IIP Activities & Required NIST Capabilities for CLARREO