Method of and a system for determining a parameter of a fluid

A system for determining a refractive index of a fluid, the system comprising:

• a sensing element having a plurality of pores,
• a controllable radiation provider configured to launch radiation of one or more wavelengths toward the pores,
• a detector configured to detect launched radiation reflected and/or scattered by the pores and output corresponding information,
• a controllable fluid providing element configured to provide fluid to the pores, and
• a controller configured to control the radiation provider and the fluid providing element and to:
• control the detector to obtain a first optical signal when the pores comprise a first fluid having a predetermined first refractive index and predetermined first absorptions at at least a first and a second wavelength,
• control the detector to obtain a second optical signal when the pores comprise a second fluid having predetermined second absorptions at at least the first and second wavelengths and a second predetermined refractive index, the second refractive index being different from the first refractive index,
• control the detector to obtain a third optical signal when the pores comprise a third fluid, and determine a refractive index of the third fluid, based on the first, second and third optical signals, the first and second absorptions, and the first and second refractive indexes.

A system for determining a parameter of a fluid, the system comprising:

• a sensing element having a plurality of pores,
• a controllable radiation provider configured to launch radiation of one or more wavelengths toward the pores,
• a detector configured to detect launched radiation reflected by the pores and output corresponding information,
• a controllable fluid providing element configured to feed fluid to the pores, and
• a controller configured to control the radiation provider and the fluid providing element and to:
• control the detector to obtain a first optical signal when the pores comprise a first fluid having a predetermined first refractive index and a predetermined first absorption at at least one of one or more wavelengths,
• control the detector to obtain a second optical signal when the pores comprise a second fluid having a second predetermined refractive index, the second refractive index being different from the first refractive index, and
• determine, based on the first and second optical signals, the predetermined first absorption as well as the first and second refractive indexes, a concentration of a component of the second fluid, the component absorbing radiation at at least one of the one or more wavelengths.