PDS_VERSION_ID = PDS3 LABEL_REVISION_NOTE = "2003-10-01" OBJECT = INSTRUMENT INSTRUMENT_HOST_ID = "DS1" INSTRUMENT_ID = "MICAS" OBJECT = INSTRUMENT_INFORMATION INSTRUMENT_NAME = "MINIATURE INTEGRATED CAMERA-SPECTROMETER" INSTRUMENT_TYPE = "IMAGING SPECTROMETER" INSTRUMENT_DESC = " In the absence of input from the DS1 team regarding the MICAS instrument, the personnel at the PDS SBN assembled the following basic information. Some additional information can be found in Soderblom et al., 2000, 'Miniature Integrated Camera Spectrometer (MICAS) Validation Report' [SODERBLOMETAL2000] which is included in the documents directory. Instrument Overview =================== The Miniature Integrated Camera Spectrometer (MICAS) is an integrated multi-channel instrument that includes two visible-wavelength imagers; a charged coupled device (VISCCD) and active pixel sensor (APS), and two imaging spectrometers; short-wavelength infrared (SWIR) and ultraviolet (UV). This instrument was flown as a technology demonstration on the New Millennium Program (NMP) Deep Space 1 (DS1) Mission. Table 1 provides a summary of MICAS instrument optical specifications. MICAS has no moving parts, uses a shared multi-wavelength long-focal length primary 10-cm telescope and provides a multi-temperature set of focal planes. The DS1 spacecraft also uses MICAS imaging for autonomous optical navigation. Technology Objectives ===================== The technology objectives of the MICAS instrument project were to flight validate the integrated, self-sequencing camera spectrometer to enable future low-mass, low-power payloads for NASA missions with severe mass and power constraints. MICAS represents a new class of sensors for NASA science missions and has broad applicability to a wide range of missions. The principal MICAS technology (and major NMP DS1 investment) is the integrated low-mass SiC multi-temperature, multi-focal-plane structure, optical bench, and multi-wavelength optics. Using methods and processes developed by SSG, both hot-pressed SiC (for overall structure and optics) and composite SiC/SiC (for the SWIR structure) were incorporated. The optics were fabricated from hot-pressed SiC forms that were clad with silicon and then diamond turned. The optical and thermal designs of MICAS have novel elements as well. The SWIR focal plane uses a direct-drive radiative cooler; the optical configuration using off-axis diamond-turned aspheres and off-axis toroidal gratings enable higher throughput with improved point spread function performance. The goal for multi-wavelength optical performance (e.g., providing acceptable transmission from ultraviolet through near infrared: ~50 to 5000 nanometers) was achieved with a series of optical coatings: Pt for the primary mirror, SiC for the UV alone, Al for combined VISCCD and SWIR, and Au for SWIR alone. The triangular structure with externally mounted optical elements provided easy access to all focal planes. Table 1. MICAS Information and Specification -------------------------------------------- Detector UV Imaging APS VISCCD SWIR Imaging Imager Imager Imaging Spectrometer Spectrometer Type 1024x2048 JPL APS 1024x1024 Rockwell FT CCD 256x256 FT CCD PICNIC Wavelength Range (nm) 80-195 500-1000 500-1000 1200-2400 Aperture Diameter(mm) 100 100 100 100 Effective Focal Length(mm) 171 677 677 752 F/number 1.7 6.8 6.8 7.5 Array Size 35x164 256x256 1024x1024 256x256 Pixel Size (micron) 54 12 9 40 FOV (deg) 0.63x0.03 0.26x0.26 0.69x0.78 0.7x0.003 IFOV (microrad/pixel) 316 17.9 13.4 54 Spectral Sampling Interval(mm/pixel) 0.64 n/a n/a 6.6 Average Spectral Resolution (nm) 2.1 n/a n/a 12 " END_OBJECT = INSTRUMENT_INFORMATION OBJECT = INSTRUMENT_REFERENCE_INFO REFERENCE_KEY_ID = "SODERBLOMETAL2000" END_OBJECT = INSTRUMENT_REFERENCE_INFO END_OBJECT = INSTRUMENT END