US 12,241,760 B2
Method and arrangement for long term drift analysis
Mats Byggmästar, Pietarsaari (FI)
Assigned to BEAMEX OY AB, Pietarsaari (FI)
Appl. No. 17/601,760
Filed by Beamex Oy AB, Pietarsaari (FI)
PCT Filed Apr. 7, 2020, PCT No. PCT/FI2020/050225
§ 371(c)(1), (2) Date Oct. 6, 2021,
PCT Pub. No. WO2020/208300, PCT Pub. Date Oct. 15, 2020.
Claims priority of application No. 20195298 (FI), filed on Apr. 12, 2019.
Prior Publication US 2022/0196447 A1, Jun. 23, 2022
Int. Cl. G01D 18/00 (2006.01); G01D 3/032 (2006.01); G01D 3/08 (2006.01); G05B 23/02 (2006.01); G08B 21/18 (2006.01)
CPC G01D 18/008 (2013.01) [G01D 3/032 (2013.01); G01D 3/08 (2013.01); G05B 23/0232 (2013.01); G08B 21/182 (2013.01)] 19 Claims
OG exemplary drawing
 
1. An arrangement to detect and store cumulative drift in measurements performed by a measurement device, the arrangement comprising:
a calibrator connectable to the measurement device at given time instants, wherein the calibrator measures at least one quantity at given measurement instants, and to save respective measurement results into a memory, and if a measurement error of the respective measurement result exceeds a predetermined threshold value, the calibrator is arranged to correct the respective measurement result within a respective measurement instant according to an adjustment step,
a controller comparing the unadjusted result of the measurement instants to the adjusted result of the previous measurement instant, thus obtaining a latest drift value during a latest calibration time interval between two consecutive measurement instants,
wherein
the controller updates a cumulative drift value in the memory by summing the latest drift value to the previous cumulative drift value, which cumulative drift value then comprises the drift of the results of the measurement device occurred since an operation of the measurement device has started or since a predetermined reference time instant during an operation of the measurement device,
wherein a magnitude of the cumulative drift value and a number of measurement instants associated with the magnitude of the cumulative drift value are applied for changing the calibration time interval of the measurement device.