1Airborne Science ProgramAirborne Science Program

EMASHSI Kick Off Meeting InterfacesNASA Ames Research Center

University of California Santa CruzAirborne Science & Technology Laboratory

EMASHSI Kick Off Meeting InterfacesNASA Ames Research Center

University of California Santa CruzAirborne Science & Technology Laboratory

Ames Research CenterAmes 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

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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

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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

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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

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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.

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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 #2AC Circuit #1

DC Circuit #2DC 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 + Neutral) @ 10A/ф recommended– Two (2) sets of 28VDC power + return @ 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 ARINC-664 recommendation Very high reliability, more expensive, longer lead time. One insert for 100Mbit, two for Gig-E ARINC-664 pinout ≠ Amphenol pinout!

– Alternative: Amphenol PCD RJ Field – RJ45 in 38999/III Shell Less reliability, cheap(er), available at Newark, Mouser, etc.

– Recommendation: Quadrax for everything that “lives” on the plane (NASDAT, EIP, feed-

throughs, etc.) Instruments have option of quadrax or RJ Field; use adapters as needed

Quadrax RJ Field

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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?

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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.

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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?

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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