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    Bosch BME680 baseline drift

    Bosch BME680 baseline drift

    Oseania
    New Poster

    Hi,

    We have been testing Bosch BME680 baseline drift by reading the raw resistance output (without BSEC). We have been using heating cycle of 150 ms at 320 C and we perform this measuremetn every two seconds. We have noticed considerable baseline drift as can be seen from teh figure below, however the baseline drift seems to stabilize after a week or so (see below, measurement 300 000). There is a considerable linear drift up to measurement 250 000 and the periodic down-peaks are due to daytime when the lab is populated by people. Is this normal behaviour and related to MOX sensors in general, i.e. is there a "burn-in" time that we have to incorporate into our manufacturing and calibration cycle?

    We have tested with BSEC and obviously the raw values are the same. However the BSEC seems to provide compensated value (IAQ) which show quite flat trends. We assume that BSEC does some kind of baseline drift removal?

     

    bosch_bme680_baseline_drift.png

     

    1 REPLY 1

    handytech
    Community Moderator
    Community Moderator

    @Oseania wrote:

    Is this normal behaviour and related to MOX sensors in general, i.e. is there a "burn-in" time that we have to incorporate into our manufacturing and calibration cycle?


    Yes, this is a standard behaviour for MOX sensors in general.This behaviour is impacted by ambient conditions, therefore it is recommend to consider this effect in the field rather than during manufacturing.


    @Oseania wrote:

    We have tested with BSEC and obviously the raw values are the same. However the BSEC seems to provide compensated value (IAQ) which show quite flat trends. We assume that BSEC does some kind of baseline drift removal?


    BSEC always runs several kinds of compensation and self-calibration processes in the background.

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