Characteristics of the evaluation of the calibration factor when transmitting a unit of average laser power

The issues of transmission of a unit of average power of laser radiation from the reference converter of the corresponding standard to the control measuring converter of the standard in a serial information transmission scheme are considered. It has been established that a large difference in the time constants of these converters leads to an increase in the measurement error. To reduce it, an algorithm is proposed based on averaging the results of multiple measurements when determining the main transmission parameter of a unit of average power – the calibration coeffi cient. The statistical characteristics of the estimation of the calibration coeffi cient are analyzed analytically. In the model of measuring transducers with lumped parameters of the fi rst order when averaging the results of multiple measurements, relationships are obtained that characterize the infl uence of the correlated stationary fl uctuation component of the instability of the laser radiation power on the determination of the calibration coeffi cient. It is shown that in this case it is advisable to use the median of the distribution of its estimate as a calibration coeffi cient, since this estimate is unbiased and consistent. Expressions are obtained for the error in estimating the calibration coeffi cient and dependences are presented that allow one to set the required measurement averaging time and the number of readings of the measured signals. The application of the proposed algorithm in the State primary standard of the unit of average power of laser radiation GET 28-2016 makes it possible to improve its metrological characteristics.

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