2012 - Europe Direct Iasi

EUROINVENT 2012
as input. The number of intervals, the number of averaged
values in each interval and the standard deviation of the
Gaussian function are user defined parameters. Modeling results
consist of the list of fuzzy interpolation function coefficients.
The approximated values and errors for all the measurements
points are also computed.
The 3 rd order spline model uses a list of measured attenuation
values for different values of the atmospheric visibility and the
wavelength as input. The number of interpolation points and the
number of averaged values are user defined parameters.
Modeling results consist of the spline function coefficients. The
approximated values and errors for all the measurements points
are also computed.
10.4.
Title Method and System for Time Interval Measuring
Authors Horia-Nicolai Teodorescu, Mircea Hulea
Institution Gheorghe Asachi Technical University of Iasi
Patent no. Patent application no: 00157/ 02. 2011
Description
The invention introduces a hybrid method for high-precision
time intervals measurements suitable for implementation on lowcost
microcontrollers such as PIC18FXXX series from
MICROCHIP. Using the build-in ADC and TIMER, the method
combines the advantages of direct counting and time-to-voltage
conversion (TtV) time measuring methods. The direct counting
method is suitable for longer time intervals measuring, but it is
less precise while the time-to-voltage conversion increases the
precision of the time measurements being applicable for
measuring shorter time intervals. The microcontroller measures
the intervals by determining the elapsed time between the rising
and the falling edges of a digital signal that represents the event.
Because the event signal and the counter clock are not
synchronous, we used the TtV method for compensating this
misalignment. The event signal transitions are detected using the
Class 10
141