SU520019A3 - Device for detecting a human smell - Google Patents

Description

Listed by regulators 20-22. Air reaches mixing sites 25-27. A sample of an objectionable odor test substance is placed in an elastic wall reservoir 28, introduced into container 29 and connected to the odoric air flow means. The air compressor 30 creates a certain compression in the container so that the unpleasant odor in the tank with elastic walls can spread into the said flow system. An unpleasant odor air flow is connected through valves 13-15 to mixing zones 25-27, where this stream is mixed with odorless air for dilution. In addition, in the flow system that creates unpleasant rooms, a motor valve 31 is installed, which during any period of time continuously increases and decreases in a certain way the flow rate in a certain range of values (for example, from 0.1 l / min to 1 l / min ), this change in speed is recorded by a recorder 32. Thus, the ratio of the amount of air with odor to the amount of odorless air flowing at the same speed continuously changes. Sensitive flow rate regulators 33-35 and valves 10-12 serve to "define at each dilution stage a stream of mixed air derived from air, in which the content of the odor-giving component is continuously changing. The mixed air is supplied to the mask that is put on the subject's face. Excess mixed air is ejected from the system via bypass 36-38. The amount of mixed air supplied at a certain speed is controlled by the flow meter 47. From mask 39, the mixed air is discharged at a certain speed through the solenoid valve 40.

The odorless air supplied by the pump 19 through the switching valve 9 is regulated at a certain flow rate by speed controller 24 and reaches the solenoid valve 42, the passage through the flow meter 48. The electromagnetic valves 40 and 42 alternately open and close at certain time intervals using a dual relay time 62.

After the mixed air flows with the unpleasant odor for a certain period of time, the valve 40 closes and the valve 42 opens instead of it for supplying the odorless air at a certain speed so that the subject’s smell does not dull. When the solenoid valves of the mixed air system and the odorless air system are closed, the valves 41 and 43 are opened and the air is blown out of the system, which prevents the flow rate from changing. Furthermore, when the solenoid valve of the mixed air system is closed, into which the air with a non-smelling smell is to be introduced, the action of the motor valve 31 of the flow system creating an unpleasant odor stops for some time, so that the degree of dilution does not change.

5 With the above dilution mechanism, various combinations of dilution levels can be obtained by passing odorless air and unpleasant odor air through switching

10 valves 6 and 10, 7 and 11, 8 and 12-1: 5.

As already mentioned, the amount of air with an unpleasant odor, which is continuously sensed or diminished at a certain speed, is added to the odorless air,

5 flowing at a certain speed. Consequently, when the subject senses the appearance or disappearance of odor, he can operate with a push-button pointer 49 so that the flow rate, creating a "distinct odor," is automatically recorded by a recorder.

When using temperature and humidity control in the proposed device, odor can be easily determined when

5 constant temperature and humidity conditions. Odorless air containing 21% oxygen and 79% nitrogen, after passing from the cylinder 54 (6 m) through the reducing valve 53 and the flow meter 63, is precisely controlled

through the flow quantity and pressure through the regulator 64, the purge pressure and the pressure in the flow being monitored by gauges 55 and 56. In addition, the pipeline switching valve 65

5 and the flowmeter 66, branched from the flow line, is intended to dilute the odor-bearing air that is stored in a reservoir with elastic walls.

Odorless air supplied from

The cylinder 0 is regulated by means 50 and 51 to predetermined values of temperature and humidity and is stored in vessel 57 with constant values of temperature and humidity. The contents of the vessel is m and

5, the air contained in it is mixed by means of a fan. Temperature control ranges from 0 to 40 ° C (± 0.5 ° C), humidity from 20 to 100% (± 5%), and they are monitored and kept constant by an automatic control device 52 connected to the cooling the coils 58 and the heating coils 59 of the temperature adjusting means 51, to the sprinkler 67 of the means 50,

5 to the sensor system 61 for recording the temperature and humidity in the vessel. The temperature and humidity in the vessel are also sensed by the sensor system 68 and recorded automatically by the recorder 69.

Example. The determination of the disagreeable odor of ethylmethyl mercaptan using the proposed device is carried out on persons with a normal sense of smell at a temperature of

external environment 18 ° C and humidity 70%. The temperature with odor is regulated within 22 ° C, the humidity is within 35%. The results are presented in the table. The moment of occurrence of the smell and the moment of its disappearance are determined immediately after sample preparation and

two hours later. As can be seen from the table, the differences due to the individual characteristics of people are very small. Similar results could never be obtained using well-known methods.

Claims (1)

Invention Formula A device for determining a human perceived odor, comprising means for delivering air at a certain rate, no odor, means for adding and adjusting the amount of air that is up, and means for supplying air, with or without odor, to the nasal orifices characterized by that, in order to improve the accuracy of determining the perception threshold odor, it is equipped with interconnected means for automatically registering the amount of added air with odor and means for freely controlling the temperature and humidity of the air, and the means for supplying air flow, with or without odor to the human nasal openings, is designed to alternately supply air smell and without it at regular intervals. , ()