Apparatus and method for measuring chlorine ions in concrete

An apparatus for measuring chlorine ions in concrete, the apparatus comprising:

• a first optical path system;
• a second optical path system,
• a spectrometer;
• and
• a central control unit,
• wherein the first optical path system comprises:
• a femtosecond laser device configured to emit ablative femtosecond laser;
• an ablative focusing lens group configured to focus the ablative femtosecond laser to obtain focused ablative femtosecond laser;
• and
• a sample configured to receive the focused ablative femtosecond laser to generate a plasma;
• the second optical path system comprises:
• a heating light source configured to emit heating laser, wherein the heating light source is wavelength-adjustable nanosecond laser;
• a dichroic mirror configured to transmit the heating laser to obtain transmitted heating laser;
• a reflecting mirror configured to reflect the transmitted heating laser to obtain reflected heating laser;
• and
• a heating laser focusing lens group configured to:
• focus the reflected heating laser to obtain focused heating laser, and irradiate the focused heating laser on the plasma to obtain a plasma with enhanced spontaneous emission strength,
• wherein the heating laser focusing lens group is further configured to focus spontaneous emission of the plasma with enhanced spontaneous emission strength to obtain focused plasma spontaneous emission,
• the reflecting mirror is further configured to reflect the focused plasma spontaneous emission to obtain reflected plasma spontaneous emission,
• the dichroic mirror is further configured to reflect the reflected plasma spontaneous emission for a second time to obtain plasma spontaneous emission that is reflected for a second time,
• the spectrometer is configured to receive the plasma spontaneous emission that is reflected for a second time to obtain spectral information, and
• the central control unit is configured to perform a clustering analysis on the spectral information to obtain content of the chlorine ions, and is specifically configured to:
• perform the clustering analysis on the spectral information to obtain a spectral intensity of the chlorine ions;
• and determine the content of the chlorine ions according to a relational expression between the spectral intensity of chlorine ions and the content of chlorine ions, wherein the relational expression between the spectral intensity of chlorine ions and the content of chlorine ions is follows:
• I
• =
• FC
• s
• ⁢
• A
• ⁢
• g
• k
• ⁢
• e
• -
• E
• k
• k
• B
• ⁢
• T
• U
• ⁡
• (
• T
• )
• ,
• wherein
• I is the spectral intensity of the chlorine ions, F is a system constant, Cs is the content of the chlorine ions, A is a transition probability at a corresponding energy level, gk is energy level degeneracy, Ek is energy at an energy level, kB is a Boltzmann constant, T is a plasma temperature, and U(T) is a partition function of the chlorine ions at the plasma temperature;
• wherein the first optical path system and the second optical path system are configured to perform excitation in a manner in which double beams are obliquely incident at an angle of 45°, so as to balance an area and a power density;
• and
• before content of chlorine ions of a to-be-tested sample is tested, a sample group with known content of chlorine ions is calibrated and measured to establish a composite calibration model of different components;
• calibration curves are established according to the different components and sampling points;
• calibration results are recorded in the central control unit;
• and the central control unit divides the different components according to the calibration results.