US 11,988,624 B2
Method for detecting at least one gas quantity of at least one predetermined gas by a measurement sensor of a plurality of gases
Franck Ben Hamouda, Toulouse (FR); and Jean-Christophe Mifsud, Goudourville (FR)
Assigned to ELLONA, Toulouse (FR)
Appl. No. 17/294,242
Filed by RUBIX S&I, Toulouse (FR); and CIDEV EURL, Toulouse (FR)
PCT Filed Nov. 22, 2019, PCT No. PCT/EP2019/082209
§ 371(c)(1), (2) Date May 14, 2021,
PCT Pub. No. WO2020/109160, PCT Pub. Date Jun. 4, 2020.
Claims priority of application No. 1871971 (FR), filed on Nov. 28, 2018.
Prior Publication US 2022/0003702 A1, Jan. 6, 2022
Int. Cl. G01N 27/02 (2006.01); G01N 33/00 (2006.01)
CPC G01N 27/02 (2013.01) [G01N 33/0027 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A method for detecting at least one amount of gas of at least one predetermined gas from a sensor for measuring a plurality of gases, said sensor comprising a sensitive layer configured to measure the plurality of gases having an impedance Zs and a heating layer on which the sensitive layer is mounted, said heating layer being configured to be supplied with electric energy in order to vary the temperature of the sensitive layer, said method comprising:
a step of supplying the heating layer with at least one first increasing voltage ramp defining a linear variation in the supply voltage and then with a second decreasing voltage ramp defining a linear variation in the supply voltage between a low voltage value and a high voltage value in order to modify the temperature of the sensitive layer during a variation period according to a temperature ramp comprising an increasing portion and a decreasing portion, the temperature ramp comprising a plurality of temperature ranges ΔT each corresponding to a gas to be measured,
a step of measuring:
a first variation in the impedance Zs of the sensitive layer at a given temperature range ΔT of the sensitive layer during the first increasing ramp, and
a second variation in the impedance Zs of the sensitive layer measured at the same given temperature range ΔT of the sensitive layer during the second decreasing ramp, the given temperature range ΔT corresponding to a given gas to be measured;
a step of comparing, to a database, the first variation in the impedance Zs and the second variation in the impedance Zs in order to determine the amount of gas associated with said given gas.