8, August 2014

ESA Open Invitation To Tender AO7463
Open Date: 08/03/2013
Closing Date: 01/05/2013

Status: ISSUED
Reference Nr.: 11.1EE.23
Prog. Ref.: TRP;Strategic Initiative
Budget Ref.: E/0901-01 – TRP;E/0800-07 – Strategic Initiative
Tender Type: C
Price Range: 200-500 KEURO
Establishment: ESTEC
Directorate: Directorate of Technical & Quality Manag
Department: Electrical Engineering Department
Division: Electromagnetics and Space Environment D
Contract Officer: Gian Lorenzo Casini
Last Update Date: 18/04/2013
Update Reason: Loaded a new Clarification(English version)
Background: The magnetic cleanliness of past or present programmes for Science and Earth Observation has been extensively based on multiple dipole modelling at unit level using so-called Mobile Coil Facilities (MCF) and at system level e.g. in the Magnetic Field Simulation Facility (German: Magnetfeldsimulationsanlage, MFSA) of IABG. These facilities use a small number of magnetometers and employ rotational measurements to obtain a magnetic signature around a unit under test. Disturbances of the ambient field during the test can require several repetitions.

The rotation could be replaced by an increased number of fixed magnetometers. This could increase reproducibility and reduce measurement uncertainty while considerably reducing test time and operator expertise. Activity:
1) Study possible multi-magnetometer setups, which reduce measurement time below 1 s to allow obtaining a “snap-shot” of the magnetic signature for a unit. Focus on optimum number of magnetometers and optimal locations for minimum uncertainty and maximum reproducibilityof results. This includes consideration of combining individual magnetometers to gradiometer configurations.
2) Develop new softwareor adapt existing programs to solve the discrete inverse problem of finding the minimum number of magnetic sources able to cause the measured magnetic signature within an allowed uncertainty margin.
3) Build prototype facility for proof-of-concept, including a. hardware facility with magnetometers and/or gradiometers and mechanical unit support, b. automatic data acquisition system, c. modelling software based on 2) and report generator.
4) Verify with known magnetic sources like arrangements of dipole magnets, quadrupolesources and current-fed coils.

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