Uncertainty in pressure sensitive paint (PSP) measurement is investigated from a standpoint of system modeling. A functional relation between the imaging system output and luminescent emission from PSP is obtained based on studies of radiative energy transports in PSP and photodetector response to luminescence. This relation provides insights into physical origins of various elemental error sou...

INTRODUCTION Angular encoder accuracy is often the key limiting factor in rotational metrology systems. Inconsistent spacing of the graduations and spindle error motion are major sources of encoder error. Through calibration, the repeatable components of encoder error can be eliminated. Calibration systems have been developed to measure the error map at 128 angular intervals, achieving 0.01" (a...

BACKGROUND Estimating the total fertility rate is challenging for many developing countries because of limited data and varying data quality. A standardized, reproducible approach to produce estimates that include an uncertainty assessment is desired. METHODS We develop a method to estimate and assess uncertainty in the total fertility rate over time, based on multiple imperfect observations ...

Typical statistical analysis of epidemiologic data captures uncertainty due to random sampling variation, but ignores more systematic sources of variation such as selection bias, measurement error, and unobserved confounding. Such sources are often only mentioned via qualitative caveats, perhaps under the heading of 'study limitations.' Recently, however, there has been considerable interest an...

Purpose. the main purpose of this study is to verify the accuracy of body composition measurements by the bIA method, using tANItA 418 MA unit. Basic procedures. For purposes of our study we decided to use the type-A uncertainty evaluation method (statistical processing of mea sured data). to formulate diagnostic error for the bIA method we used typical (standard) error of measurement from diff...

A setup for the calibration of the normalized spectral response of digital imaging sensors/cameras has been developed. In this work, we report on the experimental procedure and results of the normalized spectral response measurement for a digital imaging sensor by using LEDbased tunable uniform monochromatic source. Measurement accuracy is verified by evaluating the measurement uncertainty and ...

Gyroscopic survey technology is one of the key technologies to promote progress directional drilling technology. It great practical significance study error well trajectory measurement based on gyro surveys and identify main sources. This paper introduces sources which lead uncertainty borehole position in gyroscopic survey, six models, calculation model contribution rate ellipse. The differenc...