Cross-float experiments between a 500 MPa free-deformation (FD) piston gauge and a 200 MPa controlled-clearance (CC) one were carried out at a series of system pressures and jacket pressures. The two characteristics of the CC piston gauge, the zero clearance jacket pressure and the jacket pressure coefficient, were determined based on the Heydemann-Welch model. After that, the pressure dependence of the effective area for the FD piston was calculated using the cross-float data, from which the pressure distortion coefficient was determined to be 8.46 × 10^-7 MPa^-1. The result was about 19% larger than the one obtained by the Lame equation.

Two 1.6 GPa pressure-measuring multipliers were developed and built. Feasibility analysis of their operation up to 1.6 GPa, parameter optimisation and prediction of their behaviour were performed using Finite Element Analysis (FEA). Their performance and metrological properties were determined experimentally at pressures up to 500 MPa. The experimental and theoretical results are in reasonable agreement. With the results obtained so far, the relative standard uncertainty of the pressure measurement up to 1.6 GPa is expected to be not greater than 2·10^-4. With this new development the range of the pressure calibration service in Europe can be extended up to 1.5 GPa.

Up to now, there is no the international certified standard calibrator of dynamic pressure because the definition of dynamic pressure is not determined. Even though a few dynamic calibrators were designed, manufactured and used in a variety of industrial areas, they are not traceable to the international standards in practical. At present, the determination of response characteristics to pressure transducers is routinely limited to static calibration, while using a deadweight pressure standard. The deadweight device is a primary static pressure standard used to generate precise pressure under the assumption that the static and dynamic responses of the transducer in static calibration are equivalent. However, the differences in transducer response between static and dynamic events can lead to serious measurement errors. Dynamic techniques are required to calibrate pressure transducers to meet dynamic events in milliseconds In this paper, the calibration techniques are surveyed and classified in the area of dynamic pressure and finally analyzed in terms of the waveform, range, transition time and method of dynamic pressure so that its analysis result can be informative and helpful for those who are interested in dynamic pressure for better measurement.

The specification of mechanical properties is essential for adequate choice of material, as well as for design and manufacturing of components and products. recognised that the present state of uncertainties in testing activities is not as comprehensive as in the calibration fields. This paper presents guidelines calculation of measurement uncertainty (tensile strength and percentage elongation after fracture making the type A evaluation from historical data. also demonstrated that the application of deviation has larger representativeness than the use of diameter and load standard deviations.

To evaluate opto-mechanical performances under a certain level of windy environment, an estimation of the image motion is useful for a wide field telescope optical system. The wide field telescope is a Cassegrain telescope composed of two hyperbolic mirrors, a 0.5 m primary mirror and a 0.2 m secondary mirror, and correction lenses and then covers a 2° field of view. We performed the image motion analyses from the dynamic response based on the line of sight (LOS) sensitivity equations, which had been derived from the optical design program Code V, integrated in the finite element models by using NX NASTRAN.