Abstract: A method (100) and a system for determining pH values of fermented/acidified animal/vegetable milk products from inline optical measurements, the method comprising: emitting light into a fermented/acidified animal/vegetable milk product (101); optically detecting scattering light coming from said fermented/acidified animal/vegetable milk product, generated from said emitted light once received therein, to collect scattered light data (102); calculating by a computing device including one or more processors running an algorithm at least one value of a variable from the collected scattered light data (103); and obtaining, by said computing device a pH value of the fermented/acidified animal/vegetable milk product by using said at least one calculated value of a variable (104), wherein a single wavelength is used for collecting the scattered light data.

Abstract: A method (100) and a system for determining pH values of fermented/acidified animal/vegetable milk products from inline optical measurements, the method comprising: emitting light into a fermented/acidified animal/vegetable milk product (101); optically detecting scattering light coming from said fermented/acidified animal/vegetable milk product, generated from said emitted light once received therein, to collect scattered light data (102); calculating by a computing device including one or more processors running an algorithm at least one value of a variable from the collected scattered light data (103); and obtaining, by said computing device a pH value of the fermented/acidified animal/vegetable milk product by using said at least one calculated value of a variable (104), wherein a single wavelength is used for collecting the scattered light data.

Abstract: A method and a system for determining gel firmness values from inline optical measurements. The method comprises:—emitting light into a gel which is hardening to develop firmness;—optically detecting light coming from said gel to collect light data;—calculating a value of a rheological variable from the collected light data;—defining a mathematical model of the evolution in time of said rheological variable;—defining a mathematical model of the evolution in time of an optical variable generated from a light generation mechanism responsible for generating said detected light;—combining both mathematical models in order to obtain an expression which does not include time and which relates said rheological variable with said optical variable; and—introducing said collected light data into said expression to calculate said value of the rheological variable. The system comprises means for implementing the method of the invention.