fractional sampling

fractional sampling

[¦frak·shən·əl ′sam·pliŋ]
(mining engineering)
Mechanical selection of samples of uniformly graded material without segregation.
References in periodicals archive ?
MATLAB code examples illustrate the implementation of FIR and IIR filters for sampling rate conversion, fractional sampling rate conversion, the design of Lth-band filters, complementary filter pairs, multi-rate techniques for filter design, frequency-response masking techniques, and comb-based filters.
ISO 8178 practices allow for the use of fractional sampling systems in which a portion of engine exhaust is extracted from the stack, diluted with clean dry air to a maximum of 52[degrees]C, passed through a pair of filter membranes, and weighed.
Of primary concern with existing fractional sampling systems is the transfer tube that transports hot undiluted exhaust from the engine stack to the dilution tunnel, Graze explained.
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