Instrument Information
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| IDENTIFIER |
urn:esa:psa:context:instrument:mex.pfs::1.2
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| NAME |
Mars Express Orbiter Planetary Fourier Spectrometer
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| TYPE |
Interferometer
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| DESCRIPTION |
The Mars Express Orbiter (MEX) Planetary Fourier Spectrometer (PFS) is a double pendulum interferometer working in two wavelength ranges (1.2-5 um and 5-45 um). Martian radiation is divided into two beams by a dichroic mirror. The two ranges correspond to two planes (one on top of the other) containing the two interferometers, so that the same motor can simultaneously move the two pendulums and the two channels are sampled simultaneously and independently. The pendulum motion is accurately controlled via a laser diode reference channel using the same optics as the martian radiation. The same laser diode also generates the sampling signal for the analogue- digital converter (ADC), measuring the 600 nm displacements of the double pendulum mirror. The measurements are double-sided interferograms, so that the onboard FFT can be computed without needing the zero optical path difference location.
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| MODEL IDENTIFIER |
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| NAIF INSTRUMENT IDENTIFIER |
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| SERIAL NUMBER |
not applicable
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| REFERENCES |
unk
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