# Presentation: 010467

## Section 8

_***Section 8***_
***Instrument Status***

## Advanced Land Imager (ALI)

*** ******. . . Ralph Welsh***
*ALI Instrument Manager*

## Instrument Status

***Instrument Status***

***The instrument is in excellent condition, has passed all the environmental tests and has been fully calibrated***
***A contaminant has appeared at times on the focal plane and was removed by raising the focal plane temperature to 270 K. We are prepared to take similar action in flight, as necessary.***
***The hardware is in flight configuration***
***In the course of T/V testing the launch latch for the aperture cover will be released and it will have to be reset at the completion of the T/V tests***
***The software is in flight configuration***
***Unchanged (except for project mandated RSN upgrades) since the completion of the MIT/LL T/V tests (Dec. 1998)***

## Changes Since the Last T/V Test

***Changes Since the Last T/V Test***

***One of the aperture cover HOPA’s (High Output Paraffin Actuators) was found in a partially retracted position and was reset***
***It is believed that it was not properly reset the last time that it had been triggered***
***The RSN software was upgraded to a more recent version***
***Part of project-wide action***

## Remaining Work Prior to T/V

***Remaining Work Prior to T/V***

***No open Problem Reports***
***No work on ALI required prior to pump-down***
***Critical limits in the ASIST data base have been updated***
***Review of Test Procedures to be completed by 6/8/00***

## Preparation for T/V Tests

***Preparation for T/V Tests***

***The thermal analysis and design of appropriate heating and/or cooling plates for the T/V tests have been performed by Swales***
***MIT/LL provided the thermal model for ALI***
***Trending parameters to support T/V have been established.  No significant change expected from last T/V***
***Important conditions:***
***The solar calibration diffuser launch latch and fail-safe HOPA’s are not to be triggered***
***The aperture cover fail-safe HOPA’s are not to be triggered***

## MIT/LL T/V Test Support Team

***MIT/LL T/V Test Support Team***

***Jeff Mendenhall, ALI System Engineer***
***Don Lencioni, ALI Scientist***
***Costas Digenis, ALI Program Manager***
***Dave Hearn, ALI Performance Analyst***
***Jennifer Evans, ALI Ground Systems***

## Readiness Statement

***Readiness Statement***

***The Advanced Land Imager is ready for the second series of EO-1 thermal vacuum tests***

## Hyperion Hyperspectral Imager

*** ******. . . Bill Browne***
*Hyperion Instrument Manager*

## Hyperion Instrument Readiness

***Hyperion Instrument Readiness***

***Instrument ready for thermal vacuum test***
***No open problem reports***
***Changes since last EO-1 Thermal Vacuum Test***
***No changes to flight hardware or software. VNIR ASP temperature set point was increased (by command)***
***Hyperion Electronics Assembly (HEA) and Cryocooler Electronics Assembly (CEA) have been twice re-integrated after having been removed to accommodate removal and replacement of the WARP***
*Functional tests have verified operation following re-integration*
***Test Heaters have been added to the HEA and CEA because of a different chamber arrangement, which does not have a thermal control panel for these boxes***
***One test heater on the Hyperion Sensor Assembly (HSA) was replaced because it did not work during the last test (open circuit)***

## Special T/V Tests Involving Hyperion

***Special T/V Tests Involving Hyperion***

***Hyperion/Leisa Atmospheric Corrector (AC) Spectral Registration Comparison (SRC)***
***An arc lamp outside the chamber will be viewed through a fiber optic cable and associated optics simultaneously by Hyperion and AC to enable comparison of spectral data in the SWIR range***
***A dry run in air before chamber pump down will use the VNIR image to verify optical alignment of the fiber***
***VNIR Analog Signal Processor (ASP) Temperature Test***
***Based on data from the first EO-1 T/V tests, the VNIR ASP temperature set point has been increased from -10 C to +32C to avoid increased noise in the image data (see following charts)***
***VNIR dark current data will be collected every 2 minutes during the ASP temperature rise to extend the data baseline beyond that available, and confirm the noise is reduced***
***The VNIR ASP data will be acquired twice, once at a hot plateau, and once at a cold plateau***

## VNIR ASP Temperature Versus Noise

***VNIR ASP Temperature Versus Noise***

***The noise increase has been characterized and can be avoided by operating the ASP at temperatures above 32°C***
***Thermal models predict ASP temperature ranges of 32°C to 41°C when the ASP heater setpoints are 32°C on and 34°C off.  This is based on heating which occurs during a standard Data Collection Event.  Note that 41°C is acceptably below the upper ASP operating limit of 50°C.  Also setpoint can be reset on-orbit through command upload.***
***The power required for the higher heater setpoints is 2W at the beginning of life.  No additional power is required for end of life operations due to gradual increase in solar radiation absorption of the silver Teflon radiator surface.***
***Resolution:  Increase heater setpoint temperatures to 32/34°C***

## Hyperion Thermal Control

***Hyperion Thermal Control***

***TRW shipped to GSFC the computer-based thermal control system used during instrument-level T/V tests to provide control the array of Hyperion test heaters***
***First EO-1 T/V test used manually adjusted controls***
***System has been checked out following arrival 6/5 in preparation for EO-1 T/V II ***
***Experienced TRW technicians will oversee the system during T/V II***
***Cryocooler operations will be limited to three cycles to minimize the accumulated cycles on the SWIR focal plane***
***Each cycle adds to limit of 100 cycles recommended by manufacturer (Boeing-Anaheim)***
***Limit is based on bump-bonded focal plane assembly; bonds are life-cycle limited***
***Aircraft-based TRWIS has accumulated many more that 100 cycles without any problems***
***About 25 (TBR) cycles have been accumulated to date on Hyperion***

## Hyperion Staffing Support to EO-1 T/V II

***18 people cover 3 shifts at GSFC plus others provide remote support at TRW***

## Hyperion Data Processing

***Hyperion Data Processing***

***Quick look data processing at GSFC***
***Some image data can be analyzed at GSFC, using available software tools, when a quick confirmation is needed***
*For example, the Pre-launch Aliveness test internal cal image*
***Level 1 data processing at TRW***
***SIMs & CPT Data Collection Events (DCEs) will be processed to level 0 and made available to TRW***
*Via FTP or mailed tape*
***TRW will process them through the level 1 algorithms and return a tape to GSFC***
***Instrument performance analysis***
***Comprehensive tools used at TRW Hyperion Ops Center to evaluate instrument performance***

## Atmospheric Corrector (AC)

*** ******. . . Dennis Reuter***
*EO-1 LEISA Atmospheric Corrector*

## Since Last T/V

***Since Last T/V***

***Operation Limited to Mount Temperatures < 30°C ***
***Operational Constraints Added to Flight Software***
***Unnecessary Function Call to Switch Bytes in TSM 207***
***Function Call Removed from TSM 207 in Rev H***
***Red Limits Reviewed and Modified***
***Default Focal Plane Temperatures Set to -10°C and 2°C ***

## Status

***Status***

***Instrument in Final Flight Configuration***
***No Hardware or Software Modifications Required Before T/V (or Flight)***
***No Open Issues***
***No Work Required on Instrument Before Pump-down (AC/ Hyperion Spectral Comparison Test Set-up Still in Progress)***

## Hyperion

***(AC Spectral Registration Comparison Test)***

*** ******. . . Tim Zukowski***
*Instrument Systems*

## Test Description (1)

***Test Description (1)***

***Test presents both Hyperion and LEISA/AC with a light source having spectral features.***
***Comparison of spectral retrievals will demonstrate instrument spectral calibration accuracies.***
***Test source consists of an arc lamp with filters: light is delivered to the instruments via silica fibers, with all source elements external to T/V chamber.***
***Measurements of output from a source “breadboard” setup are basis for predicted SNRs of  >200 for both instruments for a single frame - frame averaging will increase this.***
***Test procedure drafted - consists of a series of short scene collects of unmodified lamp spectrum, then lamp plus long-pass filters at 1.1, 1.2, 1.3, and 1.4 microns.***

## Test Description (2)

***Test Description (2)***

***Technical Issues:***
***Alignment - Test has been designed to rely on mechanical tolerance, but ...***
***Hyperion requires “collimating”, so test images before chamber roll-in will verify source alignment (VNIR only). This is possible because of contamination control measures already planned.***
***Implementation - Large core fibers required for adequate light collection have large bend radius requiring special routing. Fibers are custom order with last minute delivery,  so source characterization will be post-test.***

## SRC Test GSE

***SRC Test GSE***