1 Airborne Science Program EMASHSI Kick Off Meeting Interfaces NASA Ames Research Center University of California Santa Cruz Airborne Science & Technology Laboratory

Ames Research Center Purpose: Identify interfaces between ASF and SDL Interfaces between SDL and Subs (Judson, JDSU etc) are beyond the scope of this discussion Identify important ICDs to create/control Domains of interfaces: Optical Mechanical/Environmental Electrical Software Maintenance Purpose: Identify interfaces between ASF and SDL Interfaces between SDL and Subs (Judson, JDSU etc) are beyond the scope of this discussion Identify important ICDs to create/control Domains of interfaces: Optical Mechanical/Environmental Electrical Software Maintenance Interface Identification and Control

3 Interfaces Summary  Optical  Telescope XP to COB EP interface  Port 3 dichroic, lens and detector interface  Mechanical and Environmental  Mechanical load bearing interface  Unpressurized superpod environment  Electrical  Aircraft Power from EIP  Housekeeping sensors  Port 3 detector amplifier packaging and connection  Port 4 amplifiers to MAS Digitizer connection  Software  Cryocooler serial commands/API  Maintainence  pressure vessel servicing  optical alignment servicing

4 Optical Interfaces Telescope XP to COB EP  Dick Cline has made a Zemax model of the MAS spectrometer that we have confidence in - we will share with Roy Esplin  this will help control the optical interface from the MAS spectrometer to the

5 n Port 3 dichroic to lens and detector interface  ASF supplies several optical parts after the dichroic in port 3: Lens, bandpass filter, detector  incidental parts, eg mirrors, mounts etc?  SDL designs and integrates these parts and delivers the specs to ASF for procurement Optical Interfaces

6 Mechanical Interfaces Mechanical Load Bearing Attachment  The COB will attach to the existing MAS whiskbroom spectrometer baseplate  Either existing bolt hole configuration will have to be shared with SDL or else a new baseplate may be advised  The EMAS scanner will be notionally be designed for the ER-2 superpods, but consideration should be given to how it might fit in the Global Hawk.

7 Environmental Interfaces Nominal Pressure and Temperature During Flight  instrument will operate in an pressurized ER-2 superpod at a nominal altitude of 65000ft.  Separate drive electronics can go in the presurized bay, which experiences a lower altitude equivalent environment.  Temperatures in pressurized area: approx. 0C in unpressurized area: Approx -30C

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Electrical Power Interface AC Circuit #2 AC Circuit #1 DC Circuit #2 DC Circuit #1 Safety Interlock Circuit IRIG-B (coax insert) GPS (coax insert) Box Connector: D38999/20WG-16SN (16x AWG #16 contacts) Harness Connector: D38999/26WG-16PN Signals – Two (2) sets of 3ф, 400Hz AC (Phases A,B,C + 10A/ф recommended – Two (2) sets of 28VDC power + 15A/circuit recommended – Safety Interlock circuit – both contacts of a normally open relay – GPS – L1, L2, Omnistar – IRIG-B Note: The current ratings listed here are based on an SAE AS50881/C ampacity analysis for the Global Hawk platform. Ratings may vary for other installations with different thermal, altitude, and bundling requirements.

Data Interface (Optional) Ethernet Connectors – Two Types – Amphenol D38999/III Quadrax Inserts n ARINC-664 recommendation n Very high reliability, more expensive, longer lead time. n One insert for 100Mbit, two for Gig-E n ARINC-664 pinout ≠ Amphenol pinout! – Alternative: Amphenol PCD RJ Field – RJ45 in 38999/III Shell n Less reliability, cheap(er), available at Newark, Mouser, etc. – Recommendation: n Quadrax for everything that “lives” on the plane (NASDAT, EIP, feed- throughs, etc.) n Instruments have option of quadrax or RJ Field; use adapters as needed QuadraxRJ Field

11 Electrical Interfaces Housekeeping sensors  Temperature sensor to monitor?  Pressure sensor to monitor?  Any other sensors (not counting the serial/software control for the cryocooler)  Port 3 detector to amplifier packaging and connection  Port 3 amplifier are an ASF deliverable. We need to connect electrically to the detector somehow, detector placement will be SDL’s discretion  Port 3 amp cooled?  what dimensions shall the port 3 amp board have?  Port 4 amplifiers to MAS Digitizer connection  MAS digitizer will live nearby in the pressurized compartment. how shall the signals from the port 4 amplifiers reach the digitizer?

12 Software Interfaces Software API/serial commands for the Cryocooler  MAS control PC will be able to turn the cryocooler on and off with serial commands, as well as poll temp.

13 Maintenance Interfaces  Pressure Vessel  A means to pump out the pressure vessel  accessible when install in the aircraft?  Optical Alignment  Explanation of how to perform internal spectrometer alignment  Explanation of how to perform COB alignment to telescope is part of the first interface?

14 Interfaces Review  Optical  Telescope XP to COB EP interface  Port 3 dichroic, lens and detector interface  Mechanical and Environmental  Mechanical load bearing interface  Unpressurized superpod environment  Electrical  Aircraft Power from EIP  Housekeeping sensors  Port 3 detector amplifier packaging and connection  Port 4 amplifiers to MAS Digitizer connection  Software  Cryocooler serial commands/API  Maintainence  pressure vessel servicing  optical alignment servicing