Recent results towards verification of measurement uncertainty for clarreo ir measurements
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Recent results towards verification of measurement uncertainty for CLARREO IR measurements. John Dykema CLARREO SDT, 2012 Hampton, VA. On-orbit Test/Validation (OT/V) Modules. (Measures instrument line shape). Heated Halo. (used in combination with space view for instrument calibration).

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Recent results towards verification of measurement uncertainty for clarreo ir measurements

Recent results towards verification of measurement uncertainty for CLARREO IR measurements

John Dykema

CLARREO SDT, 2012

Hampton, VA


On orbit test validation ot v modules
On-orbit Test/Validation (OT/V) Modules uncertainty for CLARREO IR measurements

(Measures instrument line shape)

Heated Halo

(used in combination with space view for instrument calibration)

(Includes Multiple Phase Change Cells for absolute temperature calibration and Heated Halo for spectral reflectance measurement )

QCL Laser

(used for blackbody reflectivity and Spectral Response Module)

  • Viewing configuration providing immunity to polarization effects.

Wisconsin & Harvard Technology Developments Under NASA IIP


Dari testbed 1
DARI Testbed (1) uncertainty for CLARREO IR measurements


Qcl housing optics thermal management electronics
QCL Housing: Optics, Thermal Management, Electronics uncertainty for CLARREO IR measurements

New kinematic lens mount


Quantum cascade laser housing exploded view
Quantum Cascade Laser Housing – Exploded View uncertainty for CLARREO IR measurements

Purge valve

Relief valve (for use during purge)

House-keeping sensor unit (T,p,RH)

Emission window (AR coated ZnSe)

QCL device mounting clamp

Collimating optic/mount

Thermal cold plate

TEC and electrical connection

Mounting structure


Qcl electronics and built in housekeeping
QCL Electronics and Built-In Housekeeping uncertainty for CLARREO IR measurements


Collimation of 60 40 output qcl device
Collimation of 60°-40° output QCL device uncertainty for CLARREO IR measurements

QCL

Asphere

Collimated

Beam


Qcl electronics chassis
QCL Electronics Chassis uncertainty for CLARREO IR measurements


Vacuum and thermal management
Vacuum and Thermal Management uncertainty for CLARREO IR measurements


Osrm trl 5
OSRM: TRL 5 uncertainty for CLARREO IR measurements

Flip mirror

Blackbodies for thermal testing

Laser power meter

QCL w/

integrated

housekeeping

Chilled

ethanol

QCL thermal management

Electronics

bus


Vacuum test results
Vacuum Test Results uncertainty for CLARREO IR measurements


Vacuum test results 2
Vacuum Test Results (2) uncertainty for CLARREO IR measurements

Results of vacuum test runs

Thermal requirements for different QCL packaging options


Dari testbed 2
DARI Testbed (2) uncertainty for CLARREO IR measurements


Osrm trl 6
OSRM: TRL 6 uncertainty for CLARREO IR measurements

System level test with CO2 laser, integrating sphere: an absolute IR lineshape standard


Osrm co 2 to qcl ils comparison 1
OSRM : CO uncertainty for CLARREO IR measurements2 to QCL ILS Comparison (1)

QCL, when T and I specifications are met, matches CO2 laser lineshape

MCT Detector


Osrm co 2 to qcl ils comparison 2
OSRM : CO uncertainty for CLARREO IR measurements2 to QCL ILS Comparison (2)

Pyroelectric Detector


Dari testbed ils
DARI Testbed ILS uncertainty for CLARREO IR measurements


Ocem qcl trl 6
OCEM-QCL TRL 6 uncertainty for CLARREO IR measurements

Inferring emissivity from laser reflection


Calibrated illuminated blackbodies
Calibrated, Illuminated Blackbodies uncertainty for CLARREO IR measurements

Pyroelectric Detector

MCT Detector


Calculation of power on detector
Calculation of Power on Detector uncertainty for CLARREO IR measurements


Optical modeling for ocem qcl
Optical Modeling for OCEM-QCL uncertainty for CLARREO IR measurements

f: div angle

Reflected Laser Light to FTS and Detector

d

q


Compute cavity emissivity
Compute Cavity Emissivity uncertainty for CLARREO IR measurements

Cf=39 (Knuteson et al.

J.TECH 2004)


Qcl subsystem pathway to trl 7
QCL Subsystem: Pathway to TRL 7 uncertainty for CLARREO IR measurements


Tec controller

Current uncertainty for CLARREO IR measurements

Sensing

Power

Conditioning

Filter

+

+

Output

Power In

Switching

RegulatorController

-

-

FB

β

Setpoint

Temperature

Offset

TEC Controller


Tec controller1
TEC Controller uncertainty for CLARREO IR measurements

  • Single Supply Operation

  • High Efficiency

  • No Heat Sink Necessary

  • Buffered Temperature Readout

  • Remote/Local Setpoint


V i board
V/I Board uncertainty for CLARREO IR measurements

Modified

Howland

Current

Source

+

Input

Waveform

LASER

Protection

-

Voltage Monitoring

V

Power

Monitoring

Current Monitoring

I

Temperature Monitoring

T

IOUT

+

VIN

-

To LASER


V i board1
V/I Board uncertainty for CLARREO IR measurements

  • Single Supply Operation

  • No Heat Sink Required

    • (depending on LASER current)

  • Multiple Monitoring Options:

    • LASER Voltage, Current (Power)

    • LASER Temperature

  • ESD Protection


In situ temperature
In Situ Temperature uncertainty for CLARREO IR measurements


Temporal drift in measurement
Temporal Drift in uncertainty for CLARREO IR measurementsMeasurement

= Satellite overpass


Spatial drift in measurement
Spatial Drift in Measurement uncertainty for CLARREO IR measurements


First assessment of uncertainty practices
First Assessment of Uncertainty Practices uncertainty for CLARREO IR measurements

From Immler et al., AMT 2010


Atmospheric satellite measurement
Atmospheric Satellite Measurement uncertainty for CLARREO IR measurements

Satellites make wavelength-dependent measurements of radianceR: retrieve x (temperature, humidity, clouds, trace gases, surface properies)


Infrared profiling process
Infrared Profiling Process uncertainty for CLARREO IR measurements


Site atmospheric state best estimate
Site Atmospheric State Best Estimate uncertainty for CLARREO IR measurements

Radiosondes drift in time and space

Radiosondes ascent time much greater than satellite measurement length

Solution: use ancillary measurements to interpolate in space and time

One approach: Tobin et al., “Atmospheric Radiation Measurement site atmospheric state best estimates for Atmospheric Infrared Sounder temperature and water vapor retrieval validation,” JGR 2006

See also Calbet et al., AMT, 2011


Tobin 2006 approach to sasbe
Tobin 2006 Approach to SASBE uncertainty for CLARREO IR measurements

Two sondes were launched within 2 hours of overpass time

Interpolate sonde profiles in time with IR-based atmospheric profiling

Interpolate sonde profiles in space with geostationary measurements

Perform weighted average of interpolated profiles to get best estimate of atmospheric column


Blackbody Calibration and Uncertainty uncertainty for CLARREO IR measurements

  • Practical Blackbody:

  • Finite Aperture •Temperature Gradients


Uncertainty assessment for vector quantities
Uncertainty Assessment for Vector Quantities uncertainty for CLARREO IR measurements

Uncertainty Assessment: In Situ Temperature Profile TSASBE

Uncertainty Assessment: Infrared Temperature Profile x


Acknowledgements
Acknowledgements uncertainty for CLARREO IR measurements

Thanks to NASA for:

IIP funding (ESTO)

IPT funding (LaRC)

SDT funding


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