Olfactory analog instrument and on-site analysis method for odor grade of specific substance

Abstract

The invention provides an olfactory analog instrument and an on-site analysis method for the odor grade of a specific substance. The invention has the following characteristics: 1, a gas sensor array constant temperature operation room, a computer and an autoinjection system are integrated in a test box; 2, utilization of a sample bottle with a volume of 250 ml and 25 ml of a to-be-tested sample enables a gas-liquid ratio to be 9: 1; 3, parallel resistance wires respectively wind in a semi-circle manner to generate 45-W power, so the sample and headspace volatilized gas are heated to a temperature of 80 DEG C in only 8 min and maintained at the temperature for 30 min; 4, 25 ml of an aqueous ethanol solution with a concentration of 100 ppm is used to generate standard reference gas in the sample bottle with a volume of 250 ml, and correction on gas sensors are carried out based on the generated standard reference gas; 5, headspace sampling flow is 500 ml / min, sampling time is 30 s, and gas sensor response signals undergo lowpass filtering and dimensionality reduction pretreatment; and 6, a database is established, and the olfactory analog instrument carries out on-site detection and grade prediction and identification on the odor of specific substances consisting of an adhesive, petroleum wax, leather, glycerin and edible vegetable oil.

Description

technical field [0001] The present invention - an olfactory simulation instrument and a method for on-site analysis of the gas (smell) taste level of specific substances, relates to the fields of computer, precision measurement, automatic control, precision machinery, analytical chemistry, and applied mathematics, and mainly solves the problems of adhesives, petroleum wax, leather, glycerin On-site analysis of gas (smell) and taste grades of specific substances such as edible vegetable oil, including precision high temperature and constant temperature of the measured sample and headspace volatile gas, large-capacity headspace volatile gas generation, optimal liquid-gas ratio, large flow precision automatic top Empty sampling, signal preprocessing, feature selection and extraction, quantitative analysis of gas (smell) and taste. Background technique [0002] The application objects of the present invention are mainly adhesives, petroleum wax, leather, glycerin, edible vegetab...

AI Technical Summary

Problems solved by technology

Through a lot of experiments, we found that simply replacing the old gas sensor with a new one of the same model is not enough; even two new gas sensors of the same model have obvious differences in their response to the same gas

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