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Herschel under test

Researchers are checking the spacecraft's ability to withstand vibration loads.
Provided by ESA, Noordwijk, Netherlands
herschel
This picture shows the Herschel spacecraft being prepared for acoustic tests.
ESA (A. Le Floc'h)
July 1, 2008
The Herschel spacecraft is now undergoing a series of mechanical tests at ESA's European Space Research and Technology Centre (ESTEC). The tests are carried out to ensure that the spacecraft can withstand the acoustic and vibration loads that it will encounter during launch.

The vibration tests were started June 20 and will be completed next week. In a video, available here, the spacecraft can be seen fastened on an electrodynamic shaker inside a clean room. It is seen being shaken along its longitudinal (the X-axis) at frequencies starting from 4 Hertz, increasing to 100 Hertz over a period of about 80 seconds.

Such vibrations tests will also be performed along the two lateral axes (the Y and the Z axis), four times each, with differing loads each time. The spacecraft's electronic components are checked for normal functionality before and after each run.

Earlier last month, Herschel successfully passed the acoustic test. During the test, the spacecraft was subjected to acoustic noise, generated to simulate the noise levels that it will encounter during launch. The test was carried out at ESTEC's Large European Acoustic Facility (LEAF).

The Herschel infrared observatory's telescope will carry the largest mirror ever flown in space. With this telescope and its three science instruments, it will observe and study relatively cool objects everywhere in the universe, in unprecedented detail. Herschel will study the birth and evolution of a wide range of celestial bodies &#8212 from stars in our own backyard to distant galaxies.
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