Wa. Halang, Sampling and representation of continuous time signals by direct local integration and spline approximation, MEASUREMENT, 29(2), 2001, pp. 95-104
The periodic sampling and acquisition of experimental continuous time funct
ions by integrating analogue-to-digital conversion is discussed. With speci
al regard to intrinsic suppression of disturbances, the theoretical justifi
cation of the superiority of this approach over point measurement schemes,
and an appropriate mathematical method based on positive spline approximati
on operators for the computer internal representation and processing of emp
irical functions are established. Then, the hardware design of a correspond
ing multichannel interfacing unit, its physical interconnection with comput
ers, and the required software support are described. The technique yields
considerable complexity and workload reductions, and eases the time constra
ints imposed on process control computers. (C) 2001 Elsevier Science Ltd. A
ll rights reserved.