swir out-of-band response › ... › 22_mcst_3.1.pdfmcst 10/14/97 3.1-8 b5-temp.3.exl chart3 (3)...
TRANSCRIPT
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EOS F C S
CGS B R
3.1-1
SWIR Out-of-Band Response
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EOS F C S
CGS B R
3.1-2
Out-of-Band Response
• Blocking Filter/Detector have a spectral gap at ~5.3 µm
• SWIR Bands observed to respond to external blackbody (BCS) and internal blackbody– Effect Follows Planck Radiance curve, scaled individually for each
band• scaling is equivalent to the transmittance of the leak
• Impact on Radiances from Calibration Sources appears to be minimal--some open issues remain– T/V Calibration sees chamber window, but not room– Solar Diffuser reflects very little solar light at 5.3 µm; heating TBR– SRCA impact TBR
• Impact on Earth signal under evaluation by various Science Team members
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Band 5 Out-of-Band Response
*Plot has in-band response for Bands 5, 6, 7, and 26 superimposed on the out-of-baud response for Band 5 3.1-4
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SWIR-B6 OOBD
Band 6 Out-of-Band Response
7
3.1-5
*Plot has in-band response for Bands 5, 6, 7, and 26 superimposed on the out-of-band response for Band 6
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SWIR-B7 OOBD
Band 7 Out-of-Band Response
*Plot has in-band response for Bands 5, 6, 7, and 26 superimposed on the out-of-band response for Band 7
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SWIR-B26 OOBD
Band 26 Out-of-Band Response
3.1-l*Plot has in-band response for Bands 5,6,7, and 26 superimposed on the out-of-band response for Band 26
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Band 5 Response to Thermal Source(Channel 10 Subframe 1 Nominal 1 Dataset)
Scene Temperature (K)
MCST 10/14/973.1-8
b5-temp.3.exl Chart3 (3)
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Band 6 Response to Thermal Source(Channel 10 Subframe 2 Nominal 1 dataset)
Scene Temperature (K)
MCST 10/16/973.1-9
b6-temp.3.exl Chart3 (3)
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0.5
0.45
0.05
0
Band 7 Response to Thermal Source(Channel 10 Subframe 1 Nominal 1 Dataset)
T-tropical(268.5 K)
T_midlat_winter (258.5 K)
dn_Ltyp=136.4dn_(SIS=0)=6.7
Ltyp= 1.0 W/(m2-sr-µm)p cos (τ) @ Ltyp= 0.013
3.5%
150 170 190 210 230 250 270 290 310 330 350Scene Temperature (K)
MCST 10/14/973.1-10
b7-temp.3.exl Chart3 (3)
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0.14
0.12
-0.02
-0.04
Band 26 Response to Thermal Source(Channel 5 Nominal 1 Dataset)
Note: t for dry atm. =~0.07
T-tropical (268.5 K)
150
MCST 10/16/97
dn_Ltyp=225.3dn_(SIS=0)=-3.7 T_midlat_winter (258.5 K)
Ltyp= 6.0 W/(m2-sr-µm)p cos (θ) @ Ltyp= 0.05
350170 190 210 230 250 270
Scene Temperature (K)
290
3.1-11b26-temp.3.dat Chart3
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200
195
190
185
180
RAW DNsBand 26 Channel 10 Nominal 1 Dataset
165
160
155
200
195
190
185
180
175
170
165
160
155
150150 170 190 210 230 250 270 290 310 330 350
BCS Temperature (K)
MCST 10/17/973.1-12
B26 raw DNs Chart2
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EOS F C S
CGS B R
3.1-13
T/V Chamber window blocks 5.3 µm light
• Window emission itself must be accounted for (dn_(SIS=0) in prev. charts) in SIS(100) calibration
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EOS F C S
CGS B R
3.1-15
SRCA stability in SWIR may allow useful calibration (TBR)
Comparison of SRCA radiance output for 1-10W lamp at different temperature plateaus
0
50
100
150
200
250
300
0 0.25 0.5 0.75 1 1.25 1.5 1.75 2 2.25
Wavelength (um)
Eff
ecti
ve r
adia
nce
(W
m-2
sr-
1um
-1)
Cold High Cold Low Nominal High Nominal Low Hot High Hot Low
Lamp temperature : 2625+/- 7K
Comparison of SRCA radiance output for 1-1W lamp at different temperature plateaus
0
5
10
15
20
25
30
35
40
0 0.25 0.5 0.75 1 1.25 1.5 1.75 2 2.25
Wavelength (um)
Eff
ecti
ve r
adia
nce
(W
m-2
sr-
1um
-1)
Cold High Cold Low Nominal High Nominal Low Hot High Hot Low
Lamp temperature: 2112+/-5K
The SRCA effective radiance change is less than ±2.0% over 2.5 months (12/96 to 2/97) at ambient and is less than ±2.5% at TV between different temperature plateaus.
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EOS F C S
CGS B R
3.1-16
Impacts on Science (Level 2 Products)
• 2.7 µm leak– “None”
• 5.4 µm leak– Under examination by Platnick, Gao, Mueller etc.
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EOS F C S
CGS B R
3.1-17
Subframe variations in Bands 5-7
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EOS F C S
CGS B R
3.1-18
Subframe variations appear in all bands
• Bands 1-4 show differences of a few DNs– attributed to small differences in integration times– manifests as a slight offset and gain difference
• offset difference disappears when SV signal subtracted off (i.e., when working in dn)
• gain difference can be removed in calibration by applying individual coefficients to the subframes
• Bands 5-7 show differences of 10s to 100s of DNs– Mechanism not yet established
– Subframe that is clocked second goes negative in the presence of large amounts of thermal light
• leads to difference in offsets between subframes even when SV signal subtracted off
– Subframe that is clocked second response is strongly dependent on instrument temperature
– ability to calibrate TBR
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EOS F C S
CGS B R
3.1-19
“Subframe that is clocked first” is subframe 1 for Bands 5 and 7 and
subframe 2 for Band 6
LWIRFPA
SWIR/MWIRFPA
NIRFPA
VISFPA
30
051015202530
292827333435363132
2524267
202223 21
17161514a
121819
766
55
14'b
13a
13'b
109811124
4
Figure 30-3. FPA Band Offsets Relative to Band 30
1 km IFOV Offsets Relative to B3015 = Optical Center
Notes:1. Band single detector locations are shown in terms of 1 km IFOV offsets from Band 30, which is first band to see a scene. FPA optical center is at IFOV 15.2. Ground scan direction of projected pattern is to the right (west to east). FPA's have false vertical separation to clarify individual FPA extent.3. During one 1km sample, 250 m Bands 1 & 2 produce 16 samples/each and 500 m Bands 3-7 produce 4 samples/each.4. The formatter assembles a science packet with bands aligned by the depicted offsets to view a common ground sample. This requires the collection of 30 frames of data before all bands have observed the same ground sample.5. Science packet locations for TDI Bands 13, 13' and 14, 14' will be at first sample location of 13 and 14. High and low gain data is provided for Band 13 and Band14. Bands 27-30 are sampled 4X, but single sample is sent to ground.
3
3
11323 151840 REV B SHEET 30-9
Ground Scan Direction of above patterns
WEST to EAST
[4][4]
[4][4]
[4] [4] [4]
3/96
Track Direction
SOUTH
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EOS F C S
CGS B R
3.1-20
Subframe pattern in Bands 1-4
Figure. Raw DN(SV) for band 1 to 4 as a function of sample numbers, at middle scan and middle FD of UAID 1504/45.dat
245
255
265
275
285
295
305
315
0 16 32 48 64 80 96 112 128 144 160
Sample number
DN(S
V)
band 1
180185
190195
200205
210
215220
225230
0 16 32 48 64 80 96 112 128 144 160
Sample number
DN(S
V)
band 2
220
230
240
250
260
270
280
290
300
310
320
0 4 8 12 16 20 24 28 32 36 40
Sample number
DN(S
V)
band 3
230
240
250
260
270
280
290
0 4 8 12 16 20 24 28 32 36 40
Sample number
DN(S
V)
band 4
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EOS F C S
CGS B R
3.1-21
Subframe variation in SWIR Bands
Figure. Raw DN(SV) for SWIR bands as a function of sample numbers at middle scan, middle FD of UAID 1504/45.dat
sample 1
200
250
300
350
400
450
500
550
600
0 4 8 12 16 20 24 28 32 36 40Sample number
DN(S
V)
band7
500
550
600
650
700
750
800
0 4 8 12 16 20 24 28 32 36 40Sample number
DN(S
V)
band6
160
165
170
175
180
185
190
0 1 2 3 4 5 6 7 8 9 10Channel number
DN(S
V)
band26
400
450
500
550
600
650
700
750
800
850
0 4 8 12 16 20 24 28 32 36 40Sample number
DN(S
V)
band5
subframe 1
subframe 2 subframe 1
subframe 2
subframe 1
subframe 2
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EOS F C S
CGS B R
3.1-22
Band 1: Subframe variation temperature independent; zero radiance
Subframe variations at different instrument temperatures(UAID 1339, 1504, 1443)
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
1 4 7 10 13 16 19 22 25 28 31 34 37 40
Channel.subframe, NIR band 1
dn(E
V-S
V)
at
SIS
= 0
cold
nom
hot
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EOS F C S
CGS B R
3.1-23
Subframe variations at different instrument temperatures(UAID 1339, 1504, 1443)
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
1 4 7 10 13 16 19 22 25 28 31 34 37 40
Channel.subframe, NIR band 2
dn(E
V-S
V)
at S
IS =
0
cold
nom
hot
Band 2: Subframe variation temperature independent; zero radiance
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EOS F C S
CGS B R
3.1-24
Subframe variations at different instrument temperatures(UAID 1339, 1504, 1443)
-0.5
-0.4
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
0.4
0.5
1 4 7 10 13 16 19
Channel.subframe, VIS band 3
dn(E
V-S
V)
at
SIS
= 0
cold
nom
hot
Band 3: Subframe variation temperature independent; zero radiance
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EOS F C S
CGS B R
3.1-25
Subframe variations at different instrument temperatures(UAID 1339, 1504, 1443)
-0.2
-0.1
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
1 4 7 10 13 16 19
Channel.subframe, VIS band 4
dn(E
V-S
V)
at S
IS =
0
cold
nom
hot
Band 4: Subframe variation temperature independent; zero radiance
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EOS F C S
CGS B R
3.1-26
Subframe variations at different instrument temperatures(UAID 1339, 1504, 1443)
106
108
110
112
114
116
118
120
122
1 4 7 10 13 16 19 22 25 28 31 34 37 40
Channel.subframe, NIR band 1
dn(E
V-S
V)
at ~
Lty
p
cold
nom
hot
Band 1: Subframe variation temperature independent; Ltyp (no consistent pattern between subframes)
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EOS F C S
CGS B R
3.1-27
Subframe variations at different instrument temperatures(UAID 1339, 1504, 1443)
230
235
240
245
250
255
260
1 4 7 10 13 16 19 22 25 28 31 34 37 40
Channel.subframe, NIR band 2
dn(E
V-S
V)
at ~
Lty
p
cold
nom
hot
Band 2: Subframe variation temperature independent; Ltyp (no consistent pattern between subframes)
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EOS F C S
CGS B R
3.1-28
Subframe variations at different instrument temperatures(UAID 1339, 1504, 1443)
200
201
202
203
204
205
206
207
208
209
1 4 7 10 13 16 19
Channel.subframe, VIS band 3
dn(E
V-S
V)
at
SIS
= ~
Lty
p
cold
nom
hot
Band 3: Subframe variation temperature independent; Ltyp (no consistent pattern between subframes)
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EOS F C S
CGS B R
3.1-29
Subframe variations at different instrument temperatures(UAID 1339, 1504, 1443)
197
198
199
200
201
202
203
204
1 4 7 10 13 16 19
Channel.subframe, VIS band 4
dn(E
V-S
V)
at ~
Lty
p
cold
nom
hot
Band 4: Subframe variation temperature independent; Ltyp (no consistent pattern between subframes)
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EOS F C S
CGS B R
3.1-30
Band 5 Subframe 2 Response goes negative when looking at BCS
RAW DN'sBand 5 channel 10 Nominal 1 data set
300
400
500
600
700
800
900
150 200 250 300 350
BCS Temperature (K)
DN_b
cs
300
400
500
600
700
800
900
DN_s
vs
DN_bcs(sf=1)DN_bcs(sf=2)DN_svs(sf=1)DN_svs(sf=2)
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EOS F C S
CGS B R
3.1-31
Subframe variations at different instrument temperatures(UAID 1339, 1504, 1443)
-70
-50
-30
-10
10
30
50
1 4 7 10 13 16 19
Channel.subframe, SWIR band 5
dn(E
V-S
V)
at
SIS
= 0
cold
nom
hot
Band 5: Subframe variation temperature dependent; zero radiance
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EOS F C S
CGS B R
3.1-32
Band 6 Subframe 1 Response goes negative when looking at BCS
RAW DN'sBand 6 channel 10 Nominal 1 Data set
480
530
580
630
680
730
780
150 200 250 300 350
BCS Temperature (K)
DN_bc
s
480
530
580
630
680
730
780
DN_sv
s
DN_bcs(sf=1)DN_bcs(sf=2)DN_svs(sf=1)DN_svs(sf=2)
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EOS F C S
CGS B R
3.1-33
Subframe variations at different instrument temperatures(UAID 1339, 1504, 1443)
-70
-60
-50
-40
-30
-20
-10
0
10
20
1 4 7 10 13 16 19
Channel.subframe, SWIR band 6
dn(E
V-S
V)
at S
IS =
0
cold
nom
hot
Band 6: Subframe variation temperature dependent; zero radiance
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EOS F C S
CGS B R
3.1-34
Band 7 Subframe 2 Response goes negative when looking at BCS
RAW DN'sBand 7 Channel 10 Nominal 1 data set
0
100
200
300
400
500
600
700
150 200 250 300 350
BCS Temperature (K)
DN_bc
s
0
100
200
300
400
500
600
700
DN_sv
s
DN_bcs(sf=1)DN_bcs(sf=2)DN_svs(sf=1)DN_svs(sf=2)
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EOS F C S
CGS B R
3.1-35
Subframe variations at different instrument temperatures(UAID 1339, 1504, 1443)
-100
-80
-60
-40
-20
0
20
40
1 4 7 10 13 16 19
Channel.subframe, SWIR band 7
dn(E
V-S
V)
at S
IS =
0
cold
nom
hot
Band 7: Subframe variation temperature dependent; zero radiance
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Temperature Dependence ofSWIR
sample 1 (*), sample 2(o)Temperature dependence of SWIR bands, middle channel, at Ltyp, from primary UAID 1338/1339, 1442/1443, 1504
3.1-36
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EOS F C S
CGS B R
3.1-37
Crosstalk Status for SWIR Bands
• First analysis of crosstalk data by SBRS showed some crosstalk of about
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Band 5 Crosstalk
3.1-38
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Crosstalk Summary
3.1-39137
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EOS F C S
CGS B R
3.1-40
crosstalk data may be contaminated by OOB leak
Response of Band 26 channel 5 to Band 5 light (1.2)Vdet=110 data gain-matched with Vdet=190 data
UAID 1291
-20
0
20
40
60
80
100
120
140
160
180
15 20 25 30 35 40 45
Frame Number
DN p
eak
b26(190)peakb26(110)peakn
Response whenBand 26 is looking at Source
(OOB leak)
Response when Band 5 is looking at Source
(crosstalk)