Abstract
A limited number of Anisotropic Magnetoresistive (AMR) commercial-off-the-shelf (COTS) magnetic sensors of the HMC series by Honeywell, with and without integrated front-end electronics, were irradiated with gamma rays up to a total irradiation dose of 200 krad (Si), following the ESCC Basic Specification No. 22900. Due to the magnetic cleanliness required for these tests a special set-up was designed and successfully employed. Several parameters of the sensors were monitored during testing and the results are reported in this paper. The authors conclude that AMR sensors without front-end electronics seem to be robust against radiation doses of up to 200 krad (Si) with a dose rate of 5 krad (Si)/hour and up to a resolution of tens of nT, but sensors with an integrated front-end seem to be more vulnerable to radiation.
Highlights
Magnetic sensors have attained considerable importance as part of the positioning and compassing systems in the field of automation, and their use today ranges anywhere from ground vehicles to aerospace platforms and devices such as cell phones and video consoles
Results on the degradation of four Anisotropic Magnetoresistive (AMR) sensors when irradiated with gamma rays up to a total irradiation dose (TID) of 200 krad are presented in this paper and described [8]
The tested sensors were exposed to an extended gamma radiation TID of 200 krad, and testing included a sufficient number of steps so as to be representative of the radiation dose of other current missions: OPTOS and MetNet
Summary
Magnetic sensors have attained considerable importance as part of the positioning and compassing systems in the field of automation, and their use today ranges anywhere from ground vehicles to aerospace platforms and devices such as cell phones and video consoles. Among the different types of solid state sensors, since the nineties magnetoresistive sensors have been proven to be the sensors with the highest technology readiness level (TRL) in the market Due to their lower power consumption and weight, magnetometers based on AMR technology (as opposed to fluxgate, cesium or proton magnetometers) have been successfully employed on-board. Results on the degradation of four AMR sensors when irradiated with gamma rays up to a TID of 200 krad are presented in this paper and described [8] Parameters such as linear response and saturation field, offset and set/reset strip deviations and power consumption were monitored for the four different types of sensors during the irradiation with powered and non-powered units. The tested sensors were exposed to an extended gamma radiation TID of 200 krad, and testing included a sufficient number of steps so as to be representative of the radiation dose of other current missions: OPTOS and MetNet
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