In industry, calibration beams are frequently coupled directly to the measurement transducer. This paper aims to quantify the effect of using such a method in contrast to the bearing supported case for a range of commercially available transducers.

The weight is a very significant property for several rocket projects’ calculations. The cost of satellite mass is very high and a reduction of 1% can save thousands of dollars. Then it’s necessary to know the most important uncertainty sources to obtain a reliable result. In this paper, a developed method is shown to find the smaller uncertainty of a rocket’s weight among several available weighing instrument parks.

Nowadays more widely is taken to use the road vehicles periodical inspection with aim to have knowledge of the technical level of item and to assure the safety. To have the assured right inspection results there shall be used various testing and measurement procedures. Among of the important are measurements of the parameters showing the road vehicles brakes correct operation. To give proper conformity estimation to the vehicles brakes operation shall be used uncertainty of measurement result. To give more confidence to the estimated uncertainty components suitable way is to carry out measurement comparisons of brakes parameters.

The main purpose of this paper is to study the uncertainty budget of hydrometers calibration and the error of Cuckow’s method according the Signal-to-Noise Ratio Taguchi approach in order to analyse this two different kinds of methodology. The calibration of density hydrometers is influenced by some parameters; in order to research the influence of these factors in the measuring value, an experimental design with dynamic characteristics was applied. With this methodology, five control factors were considered, at two levels each and a L32 Orthogonal Array was defined. It was evaluated the influence of each parameter (factor) and the interaction between them according Cuckow’s method and Taguchi methodologies. The simultaneous analysis of the error and the sensitivity leads to a proper choice of significant control factors and respective best levels in order to reduce the variability of the measurement system.

Mechanical forces can be sensed over a very broad input range (10 nN up to 100 kN) with high resolution and linearity by applying the photo-elastic effect in small solid-state lasers (diode-pumped Nd:YAG crystals). The input force vector modulates the optical frequency of the laser crystal. In our experiments sinusoidal, pulse, and transient forces are generated by a PCT drive in a special dynamic test set up. By simple autodyne detection of the laser beam and concurrent signal processing of the electrical beat signal, we can measure sinusoidal forces from DC up to 100 kHz modulation frequency. Frequency counter measurement of pulse forces can be performed within few microseconds. By digital filtering, the final value of structure-induced transient forces can be predicted with high precision in milliseconds.