KPL/IK D-CIXS Instrument kernel =========================================================================== This instrument kernel (I-kernel) contains SMART-1 Demonstration of a Compact Imaging X-ray Spectrometer (D-CIXS) optics, detector, and FOV parameters. Version and Date --------------------------------------------------------------------------- Version 3.0 -- June 22, 2005 -- Jorge Diaz del Rio, RSSD/ESA Comments updated and typos and spelling corrected after review by D-CIXS instrument team. Version 2.0 -- May 30, 2005 -- Jorge Diaz del Rio, RSSD/ESA Field-of-View definitions updated. Detector Parameters included. Detector Layout included. Preliminary Version. Pending review and approval by D-CIXS instrument team. Version 1.0 -- April 21, 2005 -- Jorge Diaz del Rio, RSSD/ESA XSM sections included in a separate IK. Preliminary Version. Pending review and approval by D-CIXS instrument team. Version 0.0 -- January 14, 2005 -- Jorge Diaz del Rio, RSSD/ESA Very Preliminary Version. Pending review and approval by D-CIXS/XSM instrument team. References --------------------------------------------------------------------------- 1. ``Kernel Pool Required Reading'' 2. ``C-kernel Required Reading'' 3. ``D-CIXS/XSM EID-B'', S1-CIX-EID-3001, Issue 5.0, September 30, 2002 4. SMART-1 Frames Definition Kernel (FK), latest version. 5. E-mail from C. Howe (6/January/2005) 6. ``R&D of the Manufacturing of a Micro-Machined Collimator For a Compact X-Ray Spectrometer For Planetary Missions'', Geoff McBride et al. Contact Information --------------------------------------------------------------------------- Jorge Diaz del Rio, RSSD/ESA, (31) 71-565-5175, jdiaz@rssd.esa.int Implementation Notes --------------------------------------------------------------------------- Applications that need SPICE I-kernel data must ``load'' the I-kernel file, normally during program initialization. Loading the kernel using the SPICELIB routine FURNSH causes the data items and their associated values present in the kernel to become associated with a data structure called the ``kernel pool''. The application program may then obtain the value(s) for any IK data item using the SPICELIB routines GDPOOL, GIPOOL, GCPOOL. Routine GETFOV may also be used if the file contains instrument field-of-view (FOV) specifications. See [1] for details. This file was created with, and can be updated with, a text editor or word processor. Conventions for Specifying Data --------------------------------------------------------------------------- Data items are specified using ``keyword=value'' assignments [1]. All keywords referencing values in this I-kernel start with the characters `INS' followed by the NAIF SMART-1 instrument ID code, constructed using the spacecraft ID number, -238, followed by the NAIF three digit ID number for D-CIXS instrument base (300) or individual D-CIXS facets (310, 320, 330). These IDs are defined in [4] as follows: Instrument name ID -------------------- ------- SMART1_DCIXS -238300 SMART1_DCIXS_FACET1 -238310 SMART1_DCIXS_FACET2 -238320 SMART1_DCIXS_FACET3 -238330 The remainder of the keyword is an underscore character followed by the unique name of the data item. For example, the number of pixels of the FACET2 is specified by INS-238320_NUMBER_OF_PIXELS The upper bound on the length of all keywords is 32 characters. If a keyword is included in more then one file, or if the same keyword appears more than once within a single file, the last assignment supersedes any earlier assignments. Instrument Overview --------------------------------------------------------------------------- From [TBD]: "D-CIXS description. To be copied from TBD source provided by the D-CIXS team." Mounting Alignment --------------------------------------------------------------------------- Refer to the latest version of the SMART-1 Frames Definition Kernel (FK) [4] for the D-CIXS reference frame definitions and mounting alignment information. Field-of-View Layout --------------------------------------------------------------------------- D-CIXS instrument has three different facets, namely FACET-1, FACET-2 and FACET-3. Each facet has a Field-of-View associated with it. FACET-2 is considered to be the center facet of D-CIXS. FACET-1 is the left facet when viewed from the instrument, pointing with a 10 degree offset from the +Z axis of the D-CIXS base frame -- SMART1_DCIXS -- in the direction of the -Y axis of base frame. FACET-3 is the right facet when viewd from the instrument, pointing with a 10 degree offset from the +Z axis of the D-CIXS base frame towards the +Y axis of the base frame. The following table describes these relationships. The facet boresight directions are obtained by rotating +Z axis about the +X axis of the SMART1_DCIXS frame by the following angles: Facet name Rotation Angle, deg ---------------------- ------------------- SMART1_DCIXS_FACET1 + 10.0 SMART1_DCIXS_FACET2 0.0 SMART1_DCIXS_FACET3 - 10.0 These relationships are shown in the following diagrams: +X D-CIXS side view: -------------------- ^ |+Zf2/+Zdb +Zf1 | \ o | o /+Zf3 +Zf1 = boresight FACET1 \ 10 | 10 / +Zf2 = boresight FACET2 \ .-|-. / +Zf3 = boresight FACET3 \.' | `./ \ | / \ | / +Xdb is out of the page \ | / \|/ --------o---------> +Ydb D-CIXS Field-of-View: --------------------- ----- .--------------------. .--------------------. ^ | | | | | | | | | | | |-----------| |----- | | | | | ^ | | | | | ~12 deg | FACET-1 | FACET-2 | FACET-3 | ~8 deg | | | | | | | | | | v | | |-----------| |----- | | | | | v | | | | ----- `--------------------' `--------------------' | | | | |<---- ~12 deg ----->|<- ~8 deg->|<---- ~12 deg ----->| D-CIXS instrument is based on several detectors made of sets of collimator cells, as described in [3] and [6]. Due to this technology, the FoV of the detector array is exactly the same as the FoV of a single collimator cell. Each facet contains a detector array of 4x2 detectors. The FoV of each facet can be computed as follows: - FACET-1 and FACET-3: 1.6 mm FoV = 2 x ( 90 - ATAN ( ---------- ) ) = 11.9882 deg. 0.168 mm .--------------. --- . FoV . | | ^ |`. .-. .'| | | | | `.' ` .' | | | | | `. .' | | | 1.6mm | `' | |--------------| | | .' `. | | | | | | | .' `. | |--------------| v |.' `.| `--------------' --- `--------------' | | | | |<- 0.168 mm ->| |<- 0.168 mm ->| - FACET-2: 2.4 mm FoV = 2 x ( 90 - ATAN ( ---------- ) ) = 8.00835 deg. 0.168 mm .--------------. --- . FoV . | | ^ |`. .-. .'| | | | | `.' ` .' | | | | | `. .' | | | 2.4mm | `' | |--------------| | | .' `. | | | | | | | .' `. | |--------------| v |.' `.| `--------------' --- `--------------' | | | | |<- 0.168 mm ->| |<- 0.168 mm ->| Optics and Detector Parameters --------------------------------------------------------------------------- This section contains assignments specifying the D-CIXS optics parameters. The D-CIXS facets' optical and detector parameters are included in the data section below, taken from [3] and [5]: ------------------------------------------------------------------- parameter FACET-1 FACET-2 FACET-3 ------------------------------------------------------------------- Focal Length, mm (1) 0.800 1.20000 0.800 IFOV, mrad/pixel (2)(3) 209.23356 139.77208 209.23356 Detector shape square square square Field of view (rad) (3) Nominal 0.20923356 0.13977208 0.20923356 ------------------------------------------------------------------- Collimator Cell Size, microns Cross-track 168.0 168.0 168.0 Along-track 168.0 168.0 168.0 Pixel Size, mm (4) Cross-track (X-axis) 10.0 10.0 10.0 Along-track (Y-axis) 10.0 10.0 10.0 Detector Array Size Cross-track (X-axis) 4 4 4 Along-track (Y-axis) 2 2 2 Detector Array Center Cross-track (X-axis) 2.5 2.5 2.5 Along-track (Y-axis) 1.5 1.5 1.5 ----------------------------------------------------------------- (1) D-CIXS has a square collimator cell of 0.168mm x 0.168mm and a square FoV of 11.9882 x 11.9882 Degrees (Facet-1 and Facet-3) or 8.00835 Degrees (Facet-2). The concept of a Focal Length with respect to the D-CIXS optics is not applicable, although it is possible to define a ``Virtual'' Focal Length. The ``Virtual'' Focal Length can be computed as: 0.084 F = --------------- tan(alpha/2) where 0.084 corresponds to the half collimator cell side and alpha is the FoV angle. (2) Facet-1 and Facet-3 have a square field of view of 11.9882 degrees while Facet-2 has a square field of view of 8.00835 degrees, as described in the Field-of-View Layout section of this kernel. (3) Due to the collimator technology, collimator cells, pixel (or detectors -- we consider each detector as a single pixel) and detector array have the same Field-of-View (4) D-CIXS has no pixels but detectors made of collimator cells. Each of these detectors is, nevertheless, considered as a single pixel. The real size of the detectors is 18.0mm x 15.45mm, although the active area is only 10mm x 10 mm. These values are provided in the assignments below, with the same units as in the table. \begindata INS-238310_FOCAL_LENGTH = ( 0.80000000 ) INS-238310_FOV_ANGULAR_SIZE = ( 0.20923356 , 0.20923356 ) INS-238310_IFOV = ( 209.23356 ) INS-238310_COLLIM_CELL_SIZE = ( 168.0 , 168.0 ) INS-238310_PIXEL_SIZE = ( 10.0 , 10.0 ) INS-238310_PIXEL_SAMPLES = ( 4 ) INS-238310_PIXEL_LINES = ( 2 ) INS-238310_CCD_CENTER = ( 2.5 , 1.5 ) INS-238320_FOCAL_LENGTH = ( 1.2000000 ) INS-238320_FOV_ANGULAR_SIZE = ( 0.13977208 , 0.13977208 ) INS-238320_IFOV = ( 139.77208 ) INS-238320_COLLIM_CELL_SIZE = ( 168.0 , 168.0 ) INS-238320_PIXEL_SIZE = ( 10.0 , 10.0 ) INS-238320_PIXEL_SAMPLES = ( 4 ) INS-238320_PIXEL_LINES = ( 2 ) INS-238320_CCD_CENTER = ( 2.5 , 1.5 ) INS-238330_FOCAL_LENGTH = ( 0.80000000 ) INS-238330_FOV_ANGULAR_SIZE = ( 0.20923356 , 0.20923356 ) INS-238330_IFOV = ( 209.23356 ) INS-238330_COLLIM_CELL_SIZE = ( 168.0 , 168.0 ) INS-238330_PIXEL_SIZE = ( 10.0 , 10.0 ) INS-238330_PIXEL_SAMPLES = ( 4 ) INS-238330_PIXEL_LINES = ( 2 ) INS-238330_CCD_CENTER = ( 2.5 , 1.5 ) \begintext FOV Definitions --------------------------------------------------------------------------- This section contains assignments defining the FOV. These definitions are based on the D-CIXS detector and optics parameters provided in this section along with the previous section and are provided in a format consistent with/required by the SPICE (CSPICE) function GETFOV (getfov_c). \begindata INS-238310_FOV_FRAME = 'SMART1_DCIXS' INS-238310_FOV_SHAPE = 'RECTANGLE' INS-238310_BORESIGHT = ( 0.0000000 -0.17364818 0.98480775 ) INS-238310_FOV_CLASS_SPEC = 'ANGLES' INS-238310_FOV_REF_VECTOR = ( 1.0 0.0 0.0 ) INS-238310_FOV_REF_ANGLE = ( 5.99410 ) INS-238310_FOV_CROSS_ANGLE = ( 5.99410 ) INS-238310_FOV_ANGLE_UNITS = 'DEGREES' INS-238320_FOV_FRAME = 'SMART1_DCIXS' INS-238320_FOV_SHAPE = 'RECTANGLE' INS-238320_BORESIGHT = ( 0.0 0.0 1.0 ) INS-238320_FOV_CLASS_SPEC = 'ANGLES' INS-238320_FOV_REF_VECTOR = ( 1.0 0.0 0.0 ) INS-238320_FOV_REF_ANGLE = ( 4.00418 ) INS-238320_FOV_CROSS_ANGLE = ( 4.00418 ) INS-238320_FOV_ANGLE_UNITS = 'DEGREES' INS-238330_FOV_FRAME = 'SMART1_DCIXS' INS-238330_FOV_SHAPE = 'RECTANGLE' INS-238330_BORESIGHT = ( 0.0000000 0.17364818 0.98480775 ) INS-238330_FOV_CLASS_SPEC = 'ANGLES' INS-238330_FOV_REF_VECTOR = ( 1.0 0.0 0.0 ) INS-238330_FOV_REF_ANGLE = ( 5.99410 ) INS-238330_FOV_CROSS_ANGLE = ( 5.99410 ) INS-238330_FOV_ANGLE_UNITS = 'DEGREES' \begintext Spectral Parameters --------------------------------------------------------------------------- Platform ID --------------------------------------------------------------------------- This number is the NAIF instrument ID of the platform on which the instrument is mounted. The D-CIXS instrument is mounted directly on the spacecraft. The D-CIXS facets are mounted on the D-CIXS base platform. \begindata INS-238300_PLATFORM_ID = ( -238000 ) INS-238310_PLATFORM_ID = ( -238300 ) INS-238320_PLATFORM_ID = ( -238300 ) INS-238330_PLATFORM_ID = ( -238300 ) \begintext