The Field Camera Unit Project definition, organization, planning S. Scuderi INAF – Catania

FCU subsystems WIC Meeting, Moscow, June 2006

Phase A objectives Definition of scientific objectives –Science team constitution –FCU top level requirements definition –Filter passbands definition Analysis of technical (optics, mechanics, electronics) solutions to satisfy system and scientific requirements. Identification of solutions through trade-off processes Development of AIV and GSE principles WIC Meeting, Moscow, June 2006

Phase B1 objectives Identification of critical elements Analysis of expected performances Finalization of trade off processes Consolidation of the project through feasibility of subsystems Costs assessment WIC Meeting, Moscow, June 2006

Project development plan PhaseDurationMilestonesDates Kick-off MeetingTo Phase A4 monthsPRRTo + 4 months Phase B14 monthsSRRTo + 4 months Phase B12 monthsEnd B1To + 2 months T o = 09/2006? Time

FCU Work Breakdown Structure

Cameras: objectives Definition of cameras performances specifications: iterative process with science team Opto-mechanical design of the cameras Definition of the architecture of the detector (science & availability) –Geometric characteristics (dimensions, format, pixel size…) –Opto-electronics characteristics (QE, temporal resolution, dynamical range, operational modes, dark current, read-out noise…) Definition of mechanisms –filter wheels –shutters Preliminary design of electronics architecture (detector & mechanisms front-end electronics) Definition of cameras mass, power and thermal budget Definition of interface requirements with main frame (optics, mechanics, electronics, thermal) Preliminary definition of operational modes of the cameras Preliminary definition of calibration requirements: pre-flight & in-flight Telemetry requirements WIC Meeting, Moscow, June 2006

Cameras: top level requirements CameraSF-UVLF-UVOC Wavelength range nm nm Focal Ratiof/10f/50 Field of View~5’~1’ Scale0.15”/pixel0.03”/pixel Resolution0.3”0.1” WSO-VIL-INST-CNF-0003 (21 Feb 2006)

FCU accommodation

FCU constraints definition Available volume:  =550mm h=170mm Power Budget: 51W –15W Imagers –36W DHU & PSU Mass Budget: 24kg –2kg per camera –8kg Imager case –10kg DHU & PSU Optical bench temperature: 20°C ( E 3°C)

Mechanical Frame Mechanical Frame Design Concept –Requirements definition of mechanical frame –Analysis of mechanical interfaces –Analysis of materials –Analysis of masses and volumes –3D Model Thermal Control Design Concept –Requirements definition of FCU thermal control –Analysis of thermo-mechanical interfaces –Analysis of materials WIC Meeting, Moscow, June 2006

Data Handling Unit Analysis of interfaces requirements –Requirements of transmission protocol –Requirements of data bus –Definition of packets format –Definition of bit rate –Specification of electrical & mechanical interfaces with cameras and spacecraft DHU Analysis of central DHU characteristics –Definition of handshake sequences –Definition of operational sequences Reliability requirements: detection and recovery of failures Definition of mass and power budget Environmental requirements (radiation, EMC, thermal, mechanical…) SW budget Specification of telemetry and commands WIC Meeting, Moscow, June 2006

Power Supply Unit Power budget analysis Definition of electrical characteristics of PSU in its various operational modes (Stand- by, normal, peak values, ecc.). Definitions of environmental requirements for PSU (temperature, radiation, EMC, vibration, pressure etc…) Analysis of power distribution from PSU towards FCU subsystems (cameras, filter wheels, shutters, DHU, etc.) Analysis of PSU thermal output WIC Meeting, Moscow, June 2006

Ground Support Equipment Definition of subsystem requiring GSE GSE design concept: definition of requirements and procedures for FCU pre-flight calibration and definition of in-flight calibrations Optical design of OGSE calibration system and proposals for in-flight calibrations Definition of interfaces requirements among OGSE, EGSE, MGSE Definition of data format, procedures for data archiving, database access, pipeline procedures for data reduction Definition of GSE development plan Costs assessment for realization of PFU GSE WIC Meeting, Moscow, June 2006

Assembly Integration Verification Identify the approach for all the activities for assembling, integrating and verifying the Field Camera Unit in terms of objectives, procedures, facilities, resources e type of test to perform The AIV Plan will deal with the activities starting since the delivery of the subsystems (UV cameras Optical camera, mechanical frame,…) until the end of the integration phase and the verification of FCU performances WIC Meeting, Moscow, June 2006

Performance requirements –MTF at specified spatial frequencies –Radial energy distribution –Encircled energy at specific wavelengths or numerical aperture Focal length Magnification Angular or linear field of view Entrance and exit pupil sizes and locations Spectral transmission requirements Image orientation for a given object Sensor characteristics –Dimensions –Spectral Response –Element Size and spacing and/or frequency response Size, shape, weight limitations Survival and operating environmental conditions Interfaces (optical, mechanical, electrical, etc.) Thermal stability requirements Duty cycle and useful life requirements Maintenance and servicing provisions (access, fits, clearances, torquing, etc.) Emergency or overload conditions Center of gravity location and lifting provisions Human-instrument interface requirements (including safety aspects) Electrical requirements and restrictions (power consumption, frequency, phase, grounding, etc.) Material selection recommendations and limitations Finish/color requirements Inspection and test provisions Electromagnetic interference restrictions and susceptibility Storage, packaging, and shipping requirements Specifications and Constraints for Optical Instruments

General topics –Focal plane layout, numbers and types of camera, related general question –Optical and mechanical design Camera digital interface –Choice between existent MIL1553 interface and other hi-speed interface. –General discussion about cameras protocol with onboard computer Camera calibration problem –Flat field calibration problems for optical and UV camera. –Discussion about additional flat field source (optical/UV) Optical camera details –Type of detector, general characteristic –Shutter. –Filters. –Analog binning on chip (if CCD chosen) –Pre-flash system (if CCD chosen) –Read-Out speed, ADC –Required temperature for detectors. –Type of cooling system. –Power consumption and dissipation. UV camera details –Type of detector, general characteristics –Filters. –Read-Out speed, ADC –Estimation for power consumption