METHOD OF CONTROLLING CONCENTRATION OF ACETONE IN AIR EXHALED BY A HUMAN, AND A DEVICE FOR REALIZING IT Russian patent published in 2019 - IPC G01N33/497 

FIELD: measuring equipment.

SUBSTANCE: group of inventions relates to the diagnosis of the presence of acetone in the air exhaled by a human. Method of controlling acetone concentration in air exhaled by a human comprises using a housing, a DC power supply, a spectrometer, a discharge cell, a sampling line equipped with an adjustable valve, an analysis and processing unit, intake of air exhaled by a person, followed by its supply to a sampling line, control of air leakage exhaled by a person, through a sampling line is carried out by means of a controlled valve, initiating discharge in the discharge cell, reducing the pressure of the air exhaled by the person, in a discharge cell by means of a pumping pump, registration of emission spectrum, normalization of the emission spectrum of a sample of air exhaled by a person. At that, additionally the alternating current source is used, which is performed by additional excitation of glow discharge in the discharge cell, and standardization of intensity spectrum of acetone in the air, exhaled by the person, is carried out by separating nitrogen emission lines to divide said emission spectrum intensity by the total intensity of all nitrogen emission lines in the visible emission spectrum, comparing values of background and critical values of the acetone emission spectrum, control values of the acetone concentration in the air exhaled by the person are determined, and the control values of the acetone concentration in the air exhaled by the person are visualized. Also disclosed is an apparatus for controlling concentration of acetone in air.

EFFECT: group of inventions provides reduction of glow-discharge plasma noise, reduced noise in the electronic signal from fluorescence of acetone vapor, high accuracy of measuring acetone concentration of not less than 30 and increased sensitivity of device 10–15 times.

2 cl, 6 dwg