System and corresponding method and sensor for assessing chloride concentration
A chloride and sensor technology, applied in the field of material durability, can solve problems such as the fragility of optical fibers
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no. 1 approach
[0090] In this embodiment, the method for assessing chloride concentration using the sensor described above is in Figure 7 described in detail in the flowchart.
[0091] In a first step S1 , the sensor 1 measures the capacitance C between each pair of facing electrodes 11 . Capacitance is measured by applying an alternating current between electrodes. This capacitance value is measured by analyzer 2 .
[0092] In a second step S2, the relative permittivity value ε is calculated from the capacitance value C using the following equation r :
[0093]
[0094] in:
[0095] -ε 0 is the vacuum permittivity (ε 0 =8.85×10 -12 F / m);
[0096] -d is the distance between the two electrodes, and
[0097] -S is the area of the electrode exposed to the calcium aluminate layer (S=a'*b).
[0098] The relative permittivity ε is calculated by analyzer 2 and / or processing module 4 r .
[0099] In the third step S3, by the processing module 4 based on the relative permittivity va...
no. 2 approach
[0116] In this embodiment, the method for assessing chloride concentration using the sensor described above is in Figure 12 detailed in the flow chart.
[0117] In a first step S'1 the sensor 1 measures the impedance value between each pair of facing or coplanar electrodes 11 . Impedance is measured by applying an alternating current between two electrodes. This impedance value is measured by the analyzer 2 .
[0118] In a second step S'2, a chloride concentration estimate is calculated by the processing module 4 based on the measured impedance values.
[0119] In this embodiment, analyzer 2 is, for example, an Agilent 4294A analyzer coupled to a Kelvin clip 16089A. The instrument operates with a voltage of 0.5V in the frequency range of 100Hz-100kHz. Since the CA is in Figure 8 In the steady state shown in , a reduction in this frequency is possible.
[0120] This method has been experimented by using the same sensor as the first embodiment.
[0121] During the exper...
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