SWIR Out-of-Band Response › ... › 22_MCST_3.1.pdfMCST 10/14/97 3.1-8 b5-temp.3.exl Chart3 (3)...

EOS F C S

CGS B R

3.1-1

SWIR Out-of-Band Response

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

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

SWIR-B6 OOBD


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

SWIR-B7 OOBD


*Plot has in-band response for Bands 5, 6, 7, and 26 superimposed on the out-of-band response for Band 7

SWIR-B26 OOBD


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

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)

Band 6 Response to Thermal Source(Channel 10 Subframe 2 Nominal 1 dataset)


MCST 10/16/973.1-9


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


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


290

3.1-11b26-temp.3.dat Chart3

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

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

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.

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.

EOS F C S

CGS B R

3.1-17

Subframe variations in Bands 5-7

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

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

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

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

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

EOS F C S

CGS B R

3.1-23


-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


dn(E

V-S

V)

at S

IS =

0

cold

nom

hot


EOS F C S

CGS B R

3.1-24


-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


EOS F C S

CGS B R

3.1-25


-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


dn(E

V-S

V)

at S

IS =

0

cold

nom

hot


EOS F C S

CGS B R

3.1-26


106

108

110

112

114

116

118

120

122

1 4 7 10 13 16 19 22 25 28 31 34 37 40


dn(E

V-S

V)

at ~

Lty

p

cold

nom

hot

Band 1: Subframe variation temperature independent; Ltyp (no consistent pattern between subframes)

EOS F C S

CGS B R

3.1-27


230

235

240

245

250

255

260

1 4 7 10 13 16 19 22 25 28 31 34 37 40


dn(E

V-S

V)

at ~

Lty

p

cold

nom

hot


EOS F C S

CGS B R

3.1-28


200

201

202

203

204

205

206

207

208

209

1 4 7 10 13 16 19


dn(E

V-S

V)

at

SIS

= ~

Lty

p

cold

nom

hot


EOS F C S

CGS B R

3.1-29


197

198

199

200

201

202

203

204

1 4 7 10 13 16 19


dn(E

V-S

V)

at ~

Lty

p

cold

nom

hot


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)

EOS F C S

CGS B R

3.1-31


-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

EOS F C S

CGS B R

3.1-32


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


EOS F C S

CGS B R

3.1-33


-70

-60

-50

-40

-30

-20

-10

0

10

20

1 4 7 10 13 16 19


dn(E

V-S

V)

at S

IS =

0

cold

nom

hot


EOS F C S

CGS B R

3.1-34


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


EOS F C S

CGS B R

3.1-35


-100

-80

-60

-40

-20

0

20

40

1 4 7 10 13 16 19


dn(E

V-S

V)

at S

IS =

0

cold

nom

hot


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

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

Band 5 Crosstalk

3.1-38

Crosstalk Summary

3.1-39137

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)

SWIR Out-of-Band Response › ... › 22_MCST_3.1.pdfMCST 10/14/97 3.1-8 b5-temp.3.exl Chart3 (3)...

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Transcript of SWIR Out-of-Band Response › ... › 22_MCST_3.1.pdfMCST 10/14/97 3.1-8 b5-temp.3.exl Chart3 (3)...