review.ppt

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Cassini CIRS Heritage
CLARREO Infrared Instrument Meeting4-6 March 2009
Don Jennings
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Nimbus 4 IRIS
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Voyager IRIS
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It Takes a Village
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CIRS Instrument Description
Telescope Diameter(cm) 50.8 Interferometers FAR
-IR MID-IR Type Polarizing Michelson Spectral
range(cm-1) 10 - 650 600 -1450 Spectral
range(microns) 15.4 - 1000 6.9 -16.6 Spectral
resolution(cm-1) 0.5 to 20 0.5 to
20 Integration time(sec) 2 to 50 2 to
50 FOCAL PLANES FP1 FP3 FP4 Spectral
range(cm-1) 10 - 650 600 - 1125 1100 -
1450 Detectors Thermopile PC HgCdTe PV
HgCdTe Pixels 2 1 x 10 1 X 10 Pixel
FOV(mrad) 3.9 0.273 0.273 Peak D(cm hz1/2
W-1) 4 x 109 2 x 1010 5 x 1011 Data Telemetry
Rate(kbs) 2, 4 Instrument Temperature(K) 170 Foc
al Planes 3 4 Temperature(K) 75 - 90
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Optical Layout
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CIRS Mechanical Layout with Raytrace
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CIRS Conceptual Layout
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CIRS Fields of Views

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CIRS FP1 spectrum at 0.5 cm-1 resolution
C4H2
C2N2
C4H2 C3H4
CH4
HC3N
C3H4
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CO HCN
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Titan in the Mid-Infrared (FP4)
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CIRS Engineering Model

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CIRS Telescope
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CIRS Reference Interferometer

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CIRS Scan Mechanism

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SPIRE Flexure Carriage
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CIRS Retroreflectors

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CIRS Mid-IR and Far-IRInterferometers

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Far-IR Beamsplitter Cold Adjustment on EM

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CIRS Mid-IR Far-IR Focal Planes

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CIRS Mid-IR Focal Plane

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CIRS Electronics

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DLaTGS pyroelectric detectors

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Data from Selex, Southhampton UK.
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Nimbus, Mariner, Voyager, Cassini
Spectral ?? Scan FOV Range
(apod) Time ______________________________
_________________________________ Nimbus 3
IRIS 400-2000 cm-1 5 cm-1 10 sec 8
deg Nimbus 4 IRIS 400-1600 2.8 16
5 Mariner 9 IRIS 200-2000 2.4 18.2
4.4 Voyager IRIS 200-4000 4.3 45.6
0.25 Cassini CIRS 10-600-1500 0.5 50
0.02, 0.2
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