Precision mechatronics are essential for the future manufacturing of nano devices and systems. Without accurate means to pattern, assemble, image and measure nano structures, we will be unable to meet the challenges of the next decade. In this paper we discuss the current state-of-theart in metrology used for motion control systems and make suggestions regarding possible future technologies that might improve the situation. What is required is a method to reduce the errors in stage position measurement which is currently interferometric on most production machines. The limitations of this...
New intelligent and miniaturized sensors for physiological parameters, frequently increasing computer performance and an information exchange via wireless networks and Bluetooth modules are supporting remote patient monitoring concepts. Moreover, advanced signature analysis and adaptive decision algorithms make innovative diagnostic tools possible for physicians. These developments are useful for patients living at home during rehabilitation and for chronically ill or handicapped persons. The new systems are discussed on the basis of our experience in sleep laboratory remote patient...
The measurement techniques developed in the last thirty-five years for the accurate measurement of thermophysical properties at high temperatures (800-3700 K) using subsecond current-heating are reviewed. Only experiments of total duration around 1 s are considered, with data acquisition performed at the sub-millisecond level. Emphasis is placed on the physics of the different techniques, as developed in major national measurement institutes around the world. A complete survey is provided, covering multiproperty experiments, extensions to thermal expansion and thermal conductivity and...
The current definition of the kelvin refers to a property of a special substance, the triple-point temperature of water. However, the stability of triple point realisations in space and time and the agreement between different cells can not be warranted as shown by experimental indications. Therefore, as a base unit of the SI the kelvin should better be defined by fixing the value of a fundamental constant, a definition already successfully exercised with the metre relying on the speed of light in vacuum. The fundamental constant linked with the kelvin is the Boltzmann constant k, which...
In this paper the recent developments in the uncertainty evaluation are outlined, by describing the activity of the Joint Committee for Guides in Metrology- Working Group 1 on the Expression of Uncertainty in Measurement, and the documents that this WG is preparing on uncertainty.
In these paper, innovative developments in sine approximation and time interval analysis methods (SAM and TIA) for primary vibration calibration by heterodyne interferometry are described in detail. The frequency demodulation of novel TIA is based on estimation of time intervals between neighbouring peaks and valleys instead of traditional positive or negative zero-crossings of Laser Doppler Interferometer (LDI) signal, while the simplified SAM uses digital reference signal to generate quadrature signals and perform phase demodulation and differentiation to restore time history of velocity....
XVIII IMEKO World Congress · TC22 · 2006 · Download
A method for estimating an upper bound of the dynamic measurement error in the time domain is derived, starting from the transfer function of the system. Labeled response uncertainty, this dynamic error bound can be included in the conventional measurement uncertainty. A typical system for measuring force, pressure or acceleration is here evaluated using this measure. The linear dynamic error arises for two reasons: Varying amplification and delay with frequency. The latter is analogous to the wellknown bandwidth limiting dispersion of signals in transmission systems. For wide spectrum...
XVIII IMEKO World Congress · TC22 · 2006 · Download