RESULTS OF TESTS RELATED TO
TARGET ACQUISITION, MARCH-AUGUST, 1988

A. L. Kinney

FEBRUARY, 1989 CAL/FOS-052



ABSTRACT

Severai tests rela.ted to target acqu.isition were ca.rried out nt
LMSO in Ma.rch and August of this year. These concerned the
sensitivity of the interstices of the diodes a.nd relative aperture
location when illuminated by die TA LEDs compared to their location
when illuminated by the Ambient ST Optical Simulator (ASTOS).

The interstices were found to have effectively half die sensitivity of
the diode. them.elves when illuminated with n. spot of approximately
14 ~. The aperture images rema.ined in the same position on the blue
side when illunünated by the TA LED. sud by the AST OS. However, on
the red side the apps.rent aperture position was different by about 12
microns in Y (perpendicular to the diode array) when illuminated by
the ASTOS in compa.rison to the position when illuminated by the TA
LED.. Th. difference in position must be removed when offsetting to
FOS aperture. after perforn3ing an LED aperture acquisition, since the
shift is compnrable to the size of the A4 (14 ~s) a.perture image.


The apertures were illuminated by the LEDs sud
mapped. Reconimendations for exposure times for aperture acquisitions
arc made based on the counts in these maps.