This paper describes a weighing system used under the conditions in which various movements exist. These various movements are heaving motion, rolling motion, pitching motion, etc. In this paper, these various movements are collectively called as “vibration-like movement”. The term of “vibration-like moving conditions” means the conditions in which vibration-like movements exist. In the previous paper, the new weighing method was proposed. This method basically requires 4 loadcells which observe the vibration-like moving conditions. These loadcells are called as “dummy loadcell”. Installing 3 dummy loadcells properly and estimating two angular velocities, this weighing method is feasible to measure the mass value of a weighed object by means of 3 dummy loadcells. In this paper, the estimating method of these velocities is explained in detail. We manufactured the weighing system which consists of a weighing loadcell and 3 dummy loadcells on trial. Several numerical simulations and experiments by using this weighing system were conducted. It is confirmed that the estimation of the angular velocities is feasible and the accurate weighing under the vibration-like moving conditions is also feasible.

Our aim is to establish a measurement system that enables highly accurate measuring mass and length of moving products with a relatively high speed on a conveyor belt. In this paper, effectiveness of the proposed measurement system is demonstrated by an analysis of a digital image taken by a digital camera. In our experimental results, it can be found in the following: First, our discrimination method of colors is that there is no need to count the number of pixels for all three primary colors, but the only one component indicated the highest value of graduation should be counted. Second, the length measurements are performed using these six kinds of the reference unit pixels for the products having lengths within a range from 200 to 1200 mm. It is quite obvious that even through any reference lengths used, the required accuracies less than ±5 mm cannot be achieved without calibration method.

The 1.1 MN lever amplification dead weight force standard machine (FSM) and a new 3 MN hydraulic type build up FSM were installed at UME in 1995 and 2002 respectively. Both machines were regularly intercompared to each other and to PTB to maintain the performances. After making a new cooperation contract, a new intercomparison measurment were organised to see the existing performances of the both machines. The measurement results show that relative measurement uncertainty of the machines are better than 1·10^-4 for 1.1 MN machine and better than 4·10^-4 for 3 MN build-up machine of UME.

Mechanical noise due to Brownian motion, electronic noise introduced by the interface circuit due to thermal noise sources in the electronic devices and quantisation noise due to the analog to digital conversion process are the main three noise sources presented in a sigma-delta modulator (ΣΔM) type system applied to a micromachined accelerometer: Based on theory of limit cycles in nonlinear closed loop systems, the mathematical model and formulae for power spectral density calculation of a micromachined accelerometer will be derived in the paper. The theoretical considerations will be verified with the simulation results in MatlabSIMULINK.

The rapid development of micro-electronics has produced an increasing demand for small sensors offering high quality performance. Strain gauges are an important aid in all areas of experimental stress analysis, for determining the strain on the surface of components. In addition, the uses of strain gauges in the manufacture of transducers for measuring mechanical quantities has proven to be extremely reliable technology, giving excellent results.