2010 hyspiri science workshop - nasa · 2010 hyspiri science workshop nirst marraco 2 of 17 august...

2010 HyspIRI Science Workshop

21-24 August 2010Pasadena, California, USA

NIRSTDescription & operation

H. Marraco

2010 HyspIRI Science WorkshopNIRST Marraco

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BANDS

<2K @ 300K1.5K @ 300K2.5K @ 400KTemp. accuracy

11.4 – 12.3 µm10.4 – 11.3 µm3.4 – 4.2 µmBand Limits

Detectable size of fire event

NE∆T

Temperature

Central wavelength 11.85 µm10.85 µm3.8 µm

250K400KMin.

200m2 @ 1000K

<0.4K @ 300K<0.8K @ 300K<1.5K @ 400K

500K1000KMax.

LWIR3 (Band 3)LWIR2 (Band 2)MWIR2 (Band 1)

2010 HyspIRI Science WorkshopNIRST Marraco

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Sun direction (-y)

Conceptual design

2010 HyspIRI Science WorkshopNIRST Marraco

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GREEN: INO-CSABROWN: IARYELLOW: TINI AEROSPACEBLUE: GEMAMAGENTA: CDA INTERCORPORANGE: CIOP-GEMALIGHT BLUE: SFK-AMPEPRED: AXSYS TECHNOLOGIES

NIRST COMPONENTS

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Power connector

Data connector

Observing windowcovered with orange

plexiglass

SurvivalconnectorTransporting legs

Thermal radiator

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LWIRMWIR

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co-registration

11.8 µm

10.8 µm

3.8 µm

1 2 3 1 2 3

MWIR LWIR

OpticalAxes

Active lines:

Band 1: MWIR2Band 2: LWIR2Band 3: LWIR3

FPA

Pixel 1

Pixel 512

2010 HyspIRI Science WorkshopNIRST Marraco

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NIRST Fields of View

Accessible Swath

FOV: 75.6 deg

Swath-Width FOV: 15.6 deg

2010 HyspIRI Science WorkshopNIRST Marraco

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Revisit Scenario

Latitude Example location

Average revisit

interval (days)

Maximum missing

days

±67º Northern Canada 0.5 0

±55ºTierra del Fuego,

mid Canada0.7 1

±23º Jujuy 1.2 2

Virtual (1000 km swath) Nadir pointing (182 km swath)

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System Transfer Function

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Power vs counts

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Observing Canada/Italy/Argentina

0m-4m ~+10m

timeline

Heaters offCameras on

TECs offCameras offHeaters on

TECs on(stabilization

in less than 2m)

Move mirror0s to 30s

Acquire data26s to XXs

Repeat as necessary

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NIRST over Argentina & Canada

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Inland waters

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Weekly memory budget

Data acquisition rate: 53 kbytes/sec

Weekly (103 rev.) statistics:

29 downloads when SAC-D is 5 over horizon at Córdoba Ground station.92 virtual overflights of Canada and Italy.185 possible inland waters acquisitions (only those necessary to get weekly

complete data).

Assumptions:

1.All acquisitions over Argentina and inland waters in neighboring countries are downloaded in real time.2.Data stored in mass memory is downloaded at 130 kbytes/sec.3.Canada and Italy are covered in a TBD%.4.Inland waters are covered in a TBD%.

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Weekly memory budget

2010 HyspIRI Science WorkshopNIRST Marraco

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Weekly memory budget

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Back up slides

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What we measure

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DVF (counts)

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DVF (power)

NEP@400k

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Pixel variety

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Active and reference (blind) pixels

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Blind pixel

Profile of BB at 4 μ

BAND |Signal@C| / |signal@B|[%]

MWIR 51% 18%

LWIR 13% 2%

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Blind pixel (MWIR)

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Priorities

1. Emergencies2. Instrument Health Care3. Science Group & AOs4. Common Users

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Calibration setup

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28C

19C

23C

16C

220C

34C

23C

Scans at the optical lab

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Pixel variety

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Pixels alongtrack (nadir)

(59ms @ 6.9 km/s ≅ 410 m 0.53 mrad @ 657 km ≅ 350 m)

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Integration

NIRST