Ames Research Center Airborne Sensor Facility MAS Spectral Measurements Review Period covered:March 2001 – March 2003 Deployments:Texas 2001 (3/15-4/5/01)

Ames Research CenterAmes Research Center Airborne Sensor FacilityAirborne Sensor Facility

MAS Spectral Measurements ReviewMAS Spectral Measurements Review

Period covered: March 2001 – March 2003

Deployments: Texas 2001 (3/15-4/5/01)

CLAMS (7/9-8/2/01)

CAMEX (8/15-9/26/01)

CRYSTAL (7/1-7/30/02)

Texas 2002 (11/19-12/12/02)

THORPEX (2/1-4/10/03)

Period covered: March 2001 – March 2003

Deployments: Texas 2001 (3/15-4/5/01)

CLAMS (7/9-8/2/01)

CAMEX (8/15-9/26/01)

CRYSTAL (7/1-7/30/02)

Texas 2002 (11/19-12/12/02)

THORPEX (2/1-4/10/03)


Noteworthy Shifts During Deployments:Noteworthy Shifts During Deployments:

TX 01 : spectral shifts: p2=+8nm, p3=+10nm, p4=+20nmCLAMS : very small shifts but p2 out of spec going inCAMEX4: no shifts in ports 1, 2, and 4.

uneven shift in port 3 (0nm in b26 to –30nm in b41)CRYSTAL: spectral shifts: p1=+1nm, p3=+25nm, p4=+3nm

band 45 failed in the field – not available for post-deployment calibration

TX 02: spectral shifts: p2=+2nm, p3=-1nm, p4=+5nmTHORPEX : spectral shifts: p2=+1nm, p3=+1nm, p4=+16nm

TX 01 : spectral shifts: p2=+8nm, p3=+10nm, p4=+20nmCLAMS : very small shifts but p2 out of spec going inCAMEX4: no shifts in ports 1, 2, and 4.

uneven shift in port 3 (0nm in b26 to –30nm in b41)CRYSTAL: spectral shifts: p1=+1nm, p3=+25nm, p4=+3nm

band 45 failed in the field – not available for post-deployment calibration

TX 02: spectral shifts: p2=+2nm, p3=-1nm, p4=+5nmTHORPEX : spectral shifts: p2=+1nm, p3=+1nm, p4=+16nm


MAS port 1 SRF history, 3/01-3/03

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1

0.4 0.45 0.5 0.55 0.6 0.65 0.7 0.75 0.8 0.85 0.9 0.95 1 1.05

spec

tral r

espo

nse

0103.c02 0103.c07 0103.c09 0303.c02 0303.c07 0303.c090401.c02 0401.c07 0401.c09 0602.c02 0601.c07 0602.c090801a.c02 0801a.c07 0801a.c09 0801b.c02 0801b.c07 0801b.c090601.c02 0601.c07 0601.c09 0802.c02 0802.c07 0802.c091002.c02 1002.c07 1002.c09 1202.c02 1202.c07 1202.c09



0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1

1.5 1.55 1.6 1.65 1.7 1.75 1.8 1.85 1.9 1.95 2 2.05 2.1 2.15 2.2 2.25

spec

tral r

espo

nse

0103.c10 0103.c20 0303.c10 0303.c20 0401.c10 0401.c20 0602.c10

0602.c20 0801a.c10 0801a.c20 0801b.c10 0801b.c20 0601.c10 0601.c20

0802.c10 0802.c20 1002.c10 1020.c20 1202.c10 1202.c20


CLAMS spectral shift

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1

1.5 1.55 1.6 1.65 1.7 1.75 1.8 1.85 1.9 1.95 2 2.05 2.1 2.15 2.2 2.25

spec

tral r

espo

nse

pre-CLAMS 0601.c10 pre-CLAMS 0601.c11 pre-CLAMS 0601.c20

post-CLAMS 0801b.c10 post-CLAMS 0801b.c11 post-CLAMS 0801b.c20

after alignment 0801a.c10 after alignment 0801a.c11 after alignment 0801a.c20



0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1

3.5 3.6 3.7 3.8 3.9 4 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 5 5.1 5.2 5.3 5.4 5.5 5.6

spec

tral r

espo

nse

0103.c30 0103.c35 0103.c40 0303.c30 0303.c35 0303.c400401.c30 0401.c35 0401.c40 0602.c30 0602.c35 0602.c400801a.c30 0801a.c35 0801a.c40 0801b.c30 0801b.c35 0801b.c400601.c30 0601.c35 0601.c40 0802.c30 0802.c35 0802.c401002.c30 1002.c35 1002.c40 1202.c30 1202.c35 1202.c40



0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1

7.5 8 8.5 9 9.5 10 10.5 11 11.5 12 12.5 13 13.5 14 14.5 15

spec

tral r

espo

nse

0103.c42 0103.c45 0103.c49 0303.c42 0303.c45 0303.c49

0401.c42 0401.c45 0401.c49 0602.c42 0602.c45 0602.c49

0801a.c42 0801a.c45 0801a.c49 0801b.c42 0801b.c45 0801b.c49

0601.c42 0601.c45 0601.c49 0802.c42 0802.c45 0802.c49

1002.c42 1002.c45 1002.c49 1202.c42 1202.c45 1202.c49


30” Sphere Stability30” Sphere StabilityMeasurement dates:•May 2001 (John Cooper with 746/ISIC)•June 2001 (Pavel Hajek with ASD•September 2001 (Pavel Hajek with ASD)•December 2001 (Pavel Hajek with ASD)•April 2002 (Pavel Hajek with ASD)•June 2002 (John Cooper with 746/ISIC, Pavel Hajek with ASD)•September 2002 (Pavel Hajek with ASD)•December 2002 (Pavel Hajek with ASD)•March 2003 (Pavel Hajek with ASD)

Measurement dates:•May 2001 (John Cooper with 746/ISIC)•June 2001 (Pavel Hajek with ASD•September 2001 (Pavel Hajek with ASD)•December 2001 (Pavel Hajek with ASD)•April 2002 (Pavel Hajek with ASD)•June 2002 (John Cooper with 746/ISIC, Pavel Hajek with ASD)•September 2002 (Pavel Hajek with ASD)•December 2002 (Pavel Hajek with ASD)•March 2003 (Pavel Hajek with ASD)


Sphere radiance change from 5/01 to 6/02 (by JC)

-8.0%

-6.0%

-4.0%

-2.0%

0.0%

2.0%

4.0%

6.0%

8.0%

0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4

microns

perc

enta

ge c

hang

e

12 lamps

9 lamps

6 lamps

3 lamps


Sphere radiance change from 5/01 to 6/02 (by JC)

-6.0%-5.0%-4.0%-3.0%-2.0%-1.0%0.0%1.0%2.0%3.0%4.0%5.0%6.0%

0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4

microns

perc

enta

ge c

hang

e

12 lamps


30" Sphere Radiance Comparison: 12 Lampsby Jim Butler from 1999 crosscal. experiment at

AMES

-4

-2

0

2

4

6

8

10

12

14

200 600 1000 1400 1800 2200 2600

Wavelength (nm)

% D

iffer

ence

from

AS

D

VXR

UAVNIR

UASWIR

SWIXR

746/ISIC


30" sphere radiance comp. (JC01-PH01)

0.0%

1.0%

2.0%

3.0%

4.0%

5.0%

6.0%

7.0%

8.0%

9.0%

10.0%

11.0%

12.0%

0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4

microns

% d

iffe

ren

ce f

rom

AS

D

jc0501-ph0601


30" sphere radiance comp. (JC02-PH02)

-2.0%-1.0%0.0%1.0%2.0%3.0%4.0%5.0%6.0%7.0%8.0%9.0%

10.0%

0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4

microns

% d

iffer

ence

from

AS

D

jc0602-ph0602


2001/2002 sphere history (by ASD)

-4.0%-3.5%-3.0%-2.5%-2.0%-1.5%-1.0%-0.5%0.0%0.5%1.0%

0.400

0.600

0.800

1.000

1.200

1.400

1.600

1.800

2.000

2.200

2.400

microns

perc

enta

ge c

hang

e fr

om 0

601

601-901

601-1201

601-402


2002/2003 sphere history (by ASD)

-6.0%-5.0%-4.0%-3.0%-2.0%-1.0%0.0%1.0%2.0%3.0%4.0%5.0%

0.400

0.600

0.800

1.000

1.200

1.400

1.600

1.800

2.000

2.200

2.400

microns

perc

enta

ge c

hang

e fr

om 0

602

0602-0902

0602-1202

0602-0303


Cary 14 SpectrophotometerCary 14 Spectrophotometer

• Upgraded to modern computer controls (OLIS)– But is still large, heavy– But, has great optics (and we have it)

• Options for use in calibration transfer:– 45° mirror– Transfer integrating sphere– Fiber-optic head

• Upgraded to modern computer controls (OLIS)– But is still large, heavy– But, has great optics (and we have it)

• Options for use in calibration transfer:– 45° mirror– Transfer integrating sphere– Fiber-optic head


Cary 14 Block DiagramCary 14 Block Diagram


Cary photo 1


Cary photo 2


Cary photo 3


Cary photo 4


New 30” SphereNew 30” Sphere

• 12 lamps, 30W ea.• 2/3 of old sphere rad.• Vertical or horizontal

orientation• Labview Controlled• Power supplies,

metering mounted on unit

• 12 lamps, 30W ea.• 2/3 of old sphere rad.• Vertical or horizontal

orientation• Labview Controlled• Power supplies,

metering mounted on unit


Extended BBExtended BB

• Being rebuilt• Best Cal Method?• Automated data

logging to be added

• Being rebuilt• Best Cal Method?• Automated data

logging to be added


Polarization Sensitivity MeasurementPolarization Sensitivity Measurement

Equipment: 30” integrating sphere

VIS polarizer: extinction ratio > 99.9% in 400-700nm, size > sphere aperture

NIR polarizer with mask:extinction ratio > 99.9% in 750-2000nm, size = 3*3 inches

Procedure: Record sphere radiance for max and min positions of polarizer. Calculate percentage difference.Repeat for 15 and 20 degree MAS tilt

Equipment: 30” integrating sphere

VIS polarizer: extinction ratio > 99.9% in 400-700nm, size > sphere aperture

NIR polarizer with mask:extinction ratio > 99.9% in 750-2000nm, size = 3*3 inches

Procedure: Record sphere radiance for max and min positions of polarizer. Calculate percentage difference.Repeat for 15 and 20 degree MAS tilt


Experiment SetupExperiment Setup


VIS polarizer 400-700nm (bands 1 through 4)

4.00%

6.00%

8.00%

10.00%

12.00%

14.00%

16.00%

18.00%

20.00%

1 2 3 4 5

band

% c

han

ge

(max

-min

) 0 degree

15 degree

20 degree

0 degree (2months earlier)


NIR polarizer 750-2000nm (bands 5 through 17)

3.00%6.00%9.00%

12.00%15.00%18.00%21.00%24.00%27.00%30.00%

5 6 7 8 9 10 11 12 13 14 15 16 17

band

% c

hang

e (m

ax-m

in)

0 degree

15 degree

20 degree


Silver: s,p reflectivity vs. angleSilver: s,p reflectivity vs. angle

Rp

Rs

1.24 µ


Silver: two-mirror throughput vs. angleSilver: two-mirror throughput vs. angle

1.24 µ

Normalized to 1 at 0°

Two mirrors, 45° incidence,with relative axial rotation

Ames Research Center Airborne Sensor Facility MAS Spectral Measurements Review Period covered:March 2001 – March 2003 Deployments:Texas 2001 (3/15-4/5/01)

Documents

nm slide

asd slide

pavel hajek

nm thorpex

nm clams

nm band

spectral shifts

small shifts