US 12,253,502 B2
Method and system for calibrating a non-selective chemical sensor
Ivan Romanytsia, Toulouse (FR)
Assigned to ELLONA, Toulouse (FR)
Appl. No. 17/758,346
Filed by ELLONA, Toulouse (FR)
PCT Filed Feb. 1, 2021, PCT No. PCT/EP2021/052288
§ 371(c)(1), (2) Date Jul. 1, 2022,
PCT Pub. No. WO2021/156193, PCT Pub. Date Aug. 12, 2021.
Claims priority of application No. 2001251 (FR), filed on Feb. 7, 2020.
Prior Publication US 2023/0003703 A1, Jan. 5, 2023
Int. Cl. G01N 33/00 (2006.01)
CPC G01N 33/0006 (2013.01) 10 Claims
OG exemplary drawing
 
1. A method for calibrating at least one sensor to be calibrated by means of at least one reference sensor, the at least one sensor to be calibrated and the at least one reference sensor being in contact with a same chemical medium, said at least one sensor to be calibrated being configured to determine a chemical signal (S1) of the amount of a group of chemical compounds in said chemical medium, said at least one reference sensor being configured to determine a reference signal whose temporal variation is correlated to that of said chemical signal (S1), said at least one sensor to be calibrated comprising:
an element for measuring an electrical signal (U), which is a function of the amount of said group of chemical compounds in said chemical medium, and
an element for calculating said chemical signal (S1) based on a conversion function (f) specific to said at least one sensor to be calibrated and configured to associate the corresponding chemical signal (S1) with said measured electrical signal (U) according to the following relationship: S1=f(U),
said method for calibrating said at least one sensor to be calibrated by means of said at least one reference sensor comprising:
a step of measuring, during a reference period, a first chemical signal (S1P1) by means of said at least one sensor to be calibrated and a first reference signal (S2P1) by means of said at least one reference sensor,
a step of determining a first regression function (gP1) defined as follows: S2P1=gP1(S1P1),
at least one step of measuring, during a test period subsequent to the reference period, a second chemical signal (S1P2) by means of said at least one sensor to be calibrated and a second reference signal (S2P2) by means of said at least one reference sensor,
at least one step of determining a second regression function (gP2) defined as follows: S2P2=gP2(S1P2),
at least one step of calculating a deviation (ε) between the first regression function (gP1) and the second regression function (gP2) and
when the deviation (ε) is greater than a reference deviation, at least one step of determining an optimized conversion function (f*) so that the second regression function (gP2) is equal to the first regression function (gP1) to enable calibrating said at least one sensor to be calibrated.