US 12,247,964 B2
Chemical capture system with integrated calibration and method of using such a system
Ivan Romanytsia, Toulouse (FR)
Assigned to ELLONA, Toulouse (FR)
Appl. No. 18/000,867
Filed by ELLONA, Toulouse (FR)
PCT Filed Jun. 29, 2021, PCT No. PCT/EP2021/067920
§ 371(c)(1), (2) Date Dec. 6, 2022,
PCT Pub. No. WO2022/002979, PCT Pub. Date Jan. 6, 2022.
Claims priority of application No. 2006965 (FR), filed on Jul. 1, 2020.
Prior Publication US 2023/0213491 A1, Jul. 6, 2023
Int. Cl. G01N 33/00 (2006.01)
CPC G01N 33/0006 (2013.01) [G01N 33/0032 (2013.01); G01N 33/0039 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A method of using a chemical capture system with integrated calibration for measuring a gaseous mixture, said system comprising:
a chamber delimiting an inner volume and comprising at least one opening for fluidic communication of the gaseous mixture and the inner volume and at least one member for closing said at least one opening moveably mounted between a closed position delimiting a closed inner volume and an open position delimiting an open inner volume,
at least one chemical sensor, called sensor to be calibrated, positioned in the inner volume of the chamber and comprising a measuring element configured to emit an electrical signal (U1) which is a function of the quantity of at least one predetermined chemical compound in the inner volume, said at least one sensor to be calibrated comprising an element for calculating a first physical signal (C1) of said at least one chemical compound from said electrical signal (U1) and a conversion function (f) specific to said at least one sensor to be calibrated according to the following relationship: C1=f(U1),
at least one photoionization sensor positioned in the inner volume, deemed not to be subject to drift, and configured, on the one hand, to emit ultraviolet rays so as to photoionize at least one predetermined chemical compound in the inner volume, and, on the other hand, to determine a second physical signal which is a function of the quantity of said at least one photoionized chemical compound, and
at least one control device,
method in which, during at least one measurement step:
the at least one control device controls the movement of the at least one closing member in the open position so that the chamber delimits an open inner volume into which the gaseous mixture enters,
said at least one sensor to be calibrated and said at least one photoionization sensor measure respectively at least one first physical measurement signal and at least one second physical measurement signal of the gaseous mixture, and
the at least one control device identifies the gaseous mixture from the at least one first and second physical measurement signals,
method wherein during at least one calibration step:
the at least one control device controls the movement of the at least one closing member in the closed position so that the chamber delimits a closed inner volume,
when the closed inner volume is free of gaseous mixture and ozone, said at least one photoionization sensor generates ozone in the closed inner volume by emitting according to a given power ultraviolet rays configured to photoionize the dioxygen present,
said at least one sensor to be calibrated measures a physical calibration signal of the ozone generated,
the at least one control device calculates the difference between the physical calibration signal and a physical reference signal, according to the given power of said at least one photoionization sensor, and
if the difference is greater than a reference difference, the at least one control unit determines an optimized conversion function for said at least one sensor to be calibrated from this difference in order to calibrate it.