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NASA Goddard Engineers Testing Webb Telescope's OSIM and BIA Instruments 04.12.12
Several critical items related to NASA's next-generation James Webb Space Telescope
are being tested in the giant thermal vacuum test chamber at NASA's Goddard Space
Flight Center, Greenbelt, Md. These photos show the OTE (Optical Telescope
Element) Simulator or OSIM wrapped in a silver blanket on a platform, being lowered
down into a vacuum chamber (called the Space Environment Simulator, or SES) by a
crane to be tested to withstand the cold temperatures of space.
 (Credit: NASA Goddard/Chris
Gunn)
› Larger image
The OSIM simulates the Webb telescope for the purposes of testing the science
instruments that will fly on the observatory. The OSIM itself will never fly into
space, but it is a vital part of the testing program to verify that the science
cameras and spectrographs will function as planned. The actual telescope
known as the OTE is the eye of the James Webb Space Telescope observatory. The OTE
will gather the light coming from space and provide it to the Webb's science instruments.
Webb needs a large mirror to collect as much light as possible to see galaxies from
the beginning of the Universe and to detect other faint astronomical sources.
 (Credit: NASA Goddard/Chris
Gunn)
› Larger image
A second piece of equipment called the Beam Image Analyzer (BIA) will shortly
be mounted on top of the OSIM for the cryo-vacuum test. The BIA incorporates a number
of sensors that are used to verify the quality of the OSIM simulation of the OTE.
Once the fidelity of the OSIM as an OTE surrogate has been confirmed by the upcoming
cryo-test, the next use of the OSIM will be next year, when the science instruments
mounted in the Integrated Science Instrument Module (ISIM) will go into the test
chamber, to be fed by the OSIM light beams, for critical focus and alignment checks
at cryogenic temperatures. The ISIM is one of three major elements that comprise
the Webb Observatory flight system. It will house the four main instruments that
will detect light from distant stars and galaxies, and planets orbiting other stars.
The structure is like a chassis in a car providing support for the engine and other
components. The upcoming careful and exacting testing of the OSIM and BIA
"stand-ins" is essential as it helps to ensure that this complex mission will be
successful and will perform in the harsh environment of space. The NASA Goddard
Space Flight Center Space Environment Simulator (SES) is a big vacuum chamber where
scientists and engineers cryo-tested the OSIM and BIA and lowered the temperature
of the structures to 42 Kelvin (-384.1 Fahrenheit or -231.1 Celsius) and below to
ensure that it can withstand the frigid temperatures of space. Test articles
are loaded through the top of the chamber using the building bridge crane. Smaller
test articles, personnel, and equipment enter through a side door at the chamber.
Randy Kimble, Integration and Test Project Scientist for the James Webb Space Telescope
at NASA's Goddard noted, "Another critical set of equipment for this test is a pair
of precise cameras on a rotating boom, which hang from the ceiling of the thermal
shroud inside the chamber; these cameras provide precise positional measurements
to further confirm the fidelity of the OSIM simulation of the optical output of
the OTE."
Related Links:› James Webb
Space Telescope › More information on the OTE Rob Gutro
NASA's Goddard Space Flight
Center, Greenbelt, Md.
Posted April 14, 2012
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