# Indirect Measurements

Chapter

## Abstract

As introduced in Chap. 1General Concepts in the Theory of Measurementschapter.1.6, indirect measurement is a measurement in which the value of the unknown quantity sought is calculated using measurements of other quantities related to the measurand by some known relation. These other quantities are called measurement arguments or, briefly, arguments.

In an indirect measurement, the true value of a measurand A is related to the true values of arguments A j (j = 1, , N) by a known function f. This relationship can be represented in a general form as
$$A = f({A}_{1},\cdots \,,\,{A}_{N}).$$
(5.1)
This equation is called a measurement equation. The specific forms of measurement equations can be considered as mathematical models of specific indirect measurements.

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