| Home. | Universe Galaxies And Stars Archives. | 
Universe Galaxies Stars logo.
     | Universe | Big Bang | Galaxies | Stars | Solar System | Planets | Hubble Telescope | NASA | Search Engine |

Mars Express Instrument Working Again.


Ten Years Since The Revolution at Amazon.

SAS Black Ops at Amazon.
Amazon Kindle EBook Reader: Click For More Information.

Mars Express.
Artist illustration of Mars Express. Image credit: ESA.

When Mars Express' Planetary Fourier Spectrometer (PFS) malfunctioned a few months ago, mission controllers weren't sure they could get it working again. Well, they were wrong. It turns out that the pendulum motor, which drives various parts of the PFS had failed, and they were able to recover by using a back-up motor. PFS is a very sensitive instrument capable of detecting minute traces of various gasses in the Martian atmosphere, including methane which could indicate current life on the Red Planet.

The Planetary Fourier Spectrometer (PFS) on board ESA’s Mars Express spacecraft is now back in operation after a malfunction, reported a few months ago.

The instrument had been successfully investigating the chemical composition of the Martian atmosphere since the beginning of 2004, when Mars Express began orbiting the Red Planet.

PFS is a very sensitive instrument, capable of measuring the distribution of the major gaseous components of the atmosphere, the vertical distribution of their temperature and pressure, and determining their variation and global circulation during the different Martian seasons.

PFS is also capable of detecting minor gaseous species and the presence of dust in the atmosphere and, during favourable observing conditions, even deducing the mineralogical composition of the soil.

PFS was the first instrument ever to make direct 'in situ' measurements of methane in the atmosphere of Mars, and provided first indications of traces of formaldehyde, both candidate ingredients for life.

To identify the nature of chemical compounds of the Martian atmosphere and their physical status, PFS detects the distinctive Infrared radiation re-emitted by different molecules when they are exposed to the light of the Sun.

The complex PFS instrument uses the interferometry technique, a high-precision measurement method in which beams of electromagnetic radiation are split and subsequently recombined after travelling different path-lengths. The beams interfere and produce an ‘interference pattern’.

This pattern, or ‘interferogram’, is then used to measure physical properties such as temperature, pressure and chemical composition.

The PFS instrument was unable to produce scientific data from July to September 2005. A series of tests and investigations took place between September and October this year.

The ‘pendulum motor’, used to drive various elements in the instrument optics, was shown to be at fault. The recovery was made possible through using internal instrument redundancy.

After switching to the instrument’s back-up motor, more powerful than the first one - the instrument has been shown to be able to produce science data just as before. Following this recovery activity, PFS will start to take new measurements routinely in early November 2005.

Original Source: ESA News Release




  Go To Print Article  


Universe - Galaxies and Stars: Links and Contacts

the web this site
 | GNU License | Contact | Copyright | WebMaster | Terms | Disclaimer | Top Of Page. |