Odor sensing system
First Claim
1. An odor sensing system for discrimination of closely parallel odors, said system comprising:
- a sample vapor supply line having a gas supply means to supply gas flow through said system, a mass flow controller connected to said gas supply means to maintain said flow constantly, a cleaning circuit including a switch-over means connected to said mass flow controller allowing said gas flow to pass through said circuit, and a sampling circuit connected to said mass flow controller, said switch-over means switching between said cleaning circuit and said sampling circuit, said sampling circuit including a plurality of sample vapor generators selectively allowing said gas flow to pass therethrough to generate a sample vapor therein,a signal output line connected to said sample vapor supply line having a plurality of gas sensors to convert said plurality of sample vapors received from said line to a plurality of pattern signals; and
a recognition line connected to said signal output line to receive said plurality of signals therefrom, said recognition line having distinction means to calculate a respective subtraction between said signals to distinguish differences therebetween, and a discrimination means connected to said distinction means to discriminate odor included in said sample from said subtracted signals.
2 Assignments
0 Petitions
Accused Products
Abstract
An odor sensing system is comprised of a sensor cell including a plurality of quartz resonator sensors aligned therein to detect odor by variation of resonance frequencies derived from weight loading on surfaces thereof, a recognition line including a neural network which recognizes data obtained by subtraction between an output signal of the sensor as frequency variation and, a reference signal selected by one of the output signals of the sensor. The sensor cell is thermostatically regulated by circulating thermostatic water therein to maintain the temperature higher than an advance line of the system. A sample to be recognized is supplied to the sensor cell in a form of vapor generated by blowing a standard gas onto the surface of the sample.
57 Citations
30 Claims
-
1. An odor sensing system for discrimination of closely parallel odors, said system comprising:
-
a sample vapor supply line having a gas supply means to supply gas flow through said system, a mass flow controller connected to said gas supply means to maintain said flow constantly, a cleaning circuit including a switch-over means connected to said mass flow controller allowing said gas flow to pass through said circuit, and a sampling circuit connected to said mass flow controller, said switch-over means switching between said cleaning circuit and said sampling circuit, said sampling circuit including a plurality of sample vapor generators selectively allowing said gas flow to pass therethrough to generate a sample vapor therein, a signal output line connected to said sample vapor supply line having a plurality of gas sensors to convert said plurality of sample vapors received from said line to a plurality of pattern signals; and a recognition line connected to said signal output line to receive said plurality of signals therefrom, said recognition line having distinction means to calculate a respective subtraction between said signals to distinguish differences therebetween, and a discrimination means connected to said distinction means to discriminate odor included in said sample from said subtracted signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
-
-
19. A method for discriminating odors having closely parallel characteristics comprising the steps of:
-
supplying a gas flow to a plurality of samples to selectively generate a sample vapor therefrom; gathering said selectively generated sample vapors; converting said plurality of sample vapors to a plurality of signals having a frequency variation, individually; selecting one of said signals, detecting said selected signal to memorize as a reference signal, detecting the remainder of said signals sequentially, calculating a subtraction between said reference signal and said remainder signals, respectively to distinguish a difference therebetween, and discriminating said subtracted signals to recognize odor included in said sample using a pattern algorithm. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
-
Specification