Method and device for the determination of at least one parameter of a mixture of a support, water and gas
AssigneeHaissam Mouhasseb
InventorHaissam Mouhasseb
Life of this patent
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Abstract
In order to measure at least one parameter of a mixture of carrier substance, water and gas, the permittivity value of the mixture is measured at different frequencies by means of a network analyzer (1) and a sensor. The measurements are entered into a mixing formula for forming a system of equations. From the system of equations, at least one parameter of the mixture can be determined. The method is also suited for the measurement of the location dependence of a parameter, e.g. for the measurement of the humidity distribution in concrete.
Claims5
A method for determining at least one parameter of a mixture of a carrier substance, water and gas, comprising the following steps:
- bringing the mixture into a measuring range of a sensor,
- measuring complex permittivity values εm(fi) of the mixture at several measuring frequencies fi by feeding an electromagnetic wave to the sensor and by means of calibration data of the sensor,
- establishing a system of equations by entering the permittivity values εm(fi) into a mixing formula
- ɛ
- m
- =
- ɛ
- b
- +
- ∑
- i
- =
- 1
- n
-
-
- v
- i
- 3
- ·
- (
- ɛ
- i
- -
- ɛ
- b
- )
- ·
- ∑
- j
- =
- 1
- 3
-
-
- ɛ
- m
- ɛ
- m
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- N
- ij
- ·
- (
- ɛ
- i
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- with ε1 and v1 being the permittivity value and the volume fraction of the gas, ε2 and V2 the permittivity value and the volume fraction of the free water, ε3 and v3 the permittivity value and the volume fraction of the bound water, εb the permittivity value of the carrier substance, and N1j, N2j and N3j the depolarization factors of an ellipsoidal cavity of the gas or the free water or the bound water, respectively, wherein n=3 when taking the bound water into account and n=2 when neglecting the bound water, and
- determining at least one unknown parameter of the mixing formula, or of a value derived from the unknown parameter, by evaluating the system of equations.
Dependencies are inferred from the claim text.