Absolute falling-ball viscometer: evaluation of measurement uncertainty
نویسندگان
چکیده
منابع مشابه
Active magnetic levitation and 3-D position measurement for a ball viscometer
We present a new technique for 3-D position sensing and active magnetic levitation of a steel ball for use in a levitating ball viscometer. In order to achieve a stable levitation, a very sensitive positioning measurement system is mandatory. For this task the differential transformer principle was chosen to realize a 3-D position measurement. This leads to a purely magnetic sensor and actuator...
متن کاملUncertainty evaluation of a fiber-based interferometer for the measurement of absolute dimensions
The evaluation of the measurement uncertainty of a robust all-fiber-based low-coherence interferometer for the measurement of absolute thickness of transparent artifacts is described. The performance of the instrument is evaluated by measuring the length of air-gaps in specially constructed artifacts and the observed measurement errors are discussed in the context of the uncertainty associated ...
متن کاملEffect of Thermal Convection on Viscosity Measurement in Vibrational Viscometer
This paper describes the experimental study of viscosity measurement error in the vibrational type viscometer, which measures viscous damping of the oscillating circular plate in a fluid in continuously increasing temperatures. The experiments are carried out to measure non-uniformity of the temperature field in the test cup of the vibrational viscometer in continuously increasing temperatures,...
متن کاملMeasurement Uncertainty Evaluation Associated with Calibration Functions
− Calibration procedures are widely implemented in metrology. This paper considers the evaluation of measurement uncertainty associated with the use of a calibration function. Three methods for uncertainty evaluation are described and the differences in the results returned are discussed. A simple calibration function is used to illustrate these differences.
متن کاملAutomated measurement of plasma viscosity by capillary viscometer.
Plasma viscosity has several advantages over the erythrocyte sedimentation rate as a measurement of an acute phase response of more than 24 hours' duration. A new capillary viscometer (Coulter Viscometer II), which gives an automated measurement of plasma viscosity, was compared with the selected manual method (Harkness viscometer) of the International Committee for Standardization in Haematolo...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Metrologia
سال: 2005
ISSN: 0026-1394,1681-7575
DOI: 10.1088/0026-1394/42/4/015