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Source publication
The use of measurement apparatus under conditions which differ
significantly from those under which the apparatus was adjusted carries
the risk of altering the previously determined measurement
characteristics. This is of special concern in the case of apparatus
which is sensitive to external measurement conditions. Advanced
measurement systems are...
Context in source publication
Context 1
... simulation it was shown, that a series of pairs of settings of potentiometers P 11 and P 21 exists, for which the dynamic response of the system is consistent with optimum characteris- tics presented in Figure 2. Results of exemplary simulation illustrating the number of such pairs are presented in Figure 8, in which the black colour designates the areas in which the dynamic of the system is in line with the optimum characteristics. Simulations were carried out using the model of the 3-µm probe and for the velocity of 1 and 35 m/s. ...
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Citations
... Inertia of such instruments is the reason why the completion of the measurement before the ambient conditions (represented by the value measured with the response of the measuring instrument) are stable, creates an additional uncertainty component, the so-called dynamic error. The concept of the impact exerted by the dynamic error during air temperature and velocity measurements using hot-wire sensors can be found in (Jamróz et al., 2012;Jamróz, 2011) and (Nabielec, 2011). The investigations concerned instantaneous values of the parameters of a non-stationary gas flow. ...
This paper discusses the problem of measuring the average velocity at the cross-section of mine heading with the use of the continuous traverse method. Based on model testing, it has been shown that measurement signals, obtained along the traversing trajectory, belong to the group of non-stationary signals. The methodology of the traversing method measurements, with the aspect of capabilities of measuring instruments used for that purpose, has been analysed. Results of simulation tests concerning the dynamic response of a vane anemometer to the measurement signal for selected trajectories of the continuous traverse have been presented. For this purpose, a velocity profile presenting an expanded stream of undisturbed air flow in the excavation has been used. Attention has been paid to the problem of selecting an adequate trajectory of anemometer movement, as the value of the velocity measured at the cross-section depends on the trajectory.
