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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)
Ames Research CenterAmes Research Center Airborne Sensor FacilityAirborne Sensor Facility
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
Ames Research CenterAmes Research Center Airborne Sensor FacilityAirborne Sensor Facility
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
Ames Research CenterAmes Research Center Airborne Sensor FacilityAirborne Sensor Facility
MAS port 2 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
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
Ames Research CenterAmes Research Center Airborne Sensor FacilityAirborne Sensor Facility
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
Ames Research CenterAmes Research Center Airborne Sensor FacilityAirborne Sensor Facility
MAS port 3 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
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
Ames Research CenterAmes Research Center Airborne Sensor FacilityAirborne Sensor Facility
MAS port 4 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
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
Ames Research CenterAmes Research Center Airborne Sensor FacilityAirborne Sensor Facility
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)
Ames Research CenterAmes Research Center Airborne Sensor FacilityAirborne Sensor Facility
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
Ames Research CenterAmes Research Center Airborne Sensor FacilityAirborne Sensor Facility
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
Ames Research CenterAmes Research Center Airborne Sensor FacilityAirborne Sensor Facility
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
Ames Research CenterAmes Research Center Airborne Sensor FacilityAirborne Sensor Facility
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
Ames Research CenterAmes Research Center Airborne Sensor FacilityAirborne Sensor Facility
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
Ames Research CenterAmes Research Center Airborne Sensor FacilityAirborne Sensor Facility
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
Ames Research CenterAmes Research Center Airborne Sensor FacilityAirborne Sensor Facility
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
Ames Research CenterAmes Research Center Airborne Sensor FacilityAirborne Sensor Facility
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
Ames Research CenterAmes Research Center Airborne Sensor FacilityAirborne Sensor Facility
Cary 14 Block DiagramCary 14 Block Diagram
Ames Research CenterAmes Research Center Airborne Sensor FacilityAirborne Sensor Facility
Cary photo 1
Ames Research CenterAmes Research Center Airborne Sensor FacilityAirborne Sensor Facility
Cary photo 2
Ames Research CenterAmes Research Center Airborne Sensor FacilityAirborne Sensor Facility
Cary photo 3
Ames Research CenterAmes Research Center Airborne Sensor FacilityAirborne Sensor Facility
Cary photo 4
Ames Research CenterAmes Research Center Airborne Sensor FacilityAirborne Sensor Facility
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
Ames Research CenterAmes Research Center Airborne Sensor FacilityAirborne Sensor Facility
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
Ames Research CenterAmes Research Center Airborne Sensor FacilityAirborne Sensor Facility
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
Ames Research CenterAmes Research Center Airborne Sensor FacilityAirborne Sensor Facility
Experiment SetupExperiment Setup
Ames Research CenterAmes Research Center Airborne Sensor FacilityAirborne Sensor Facility
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)
Ames Research CenterAmes Research Center Airborne Sensor FacilityAirborne Sensor Facility
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
Ames Research CenterAmes Research Center Airborne Sensor FacilityAirborne Sensor Facility
Silver: s,p reflectivity vs. angleSilver: s,p reflectivity vs. angle
Rp
Rs
1.24 µ
Ames Research CenterAmes Research Center Airborne Sensor FacilityAirborne Sensor Facility
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