JPH0599868A - Measurement system and device of organoleptic value - Google Patents

Abstract

PURPOSE:To measure odor intensity, an odor concentration, an odor index and a discomfort index by the use of the device. CONSTITUTION:The device is composed of a preprocessing part 1 and a measurement part 2, furthermore the preprocessing part 1 comprises an air pump 3, a flow controller 4, a silica filler vessel 5, a constant temperature bath 6, a humidifier 7, a mixture bath 8 and a humidity sensor 9 and the measurement part 2 consists of a measurement gas pump 9 and an odor sensor 10. Thereby values of odor intensity, an odor concentration, an odor index and a discomfort index measured in an organoleptic test can be measured by the use of the device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system and apparatus for measuring odorous gas and environmental conditions.

[0002]

2. Description of the Related Art Conventionally, as a unit for expressing a measured value of odorous gas, a method of expressing by a gas component concentration and a method of expressing by a unit of odor concentration, odor index, odor intensity, etc. by a sensory test by a human panelist's olfaction have been used. ing. Further, a unit called discomfort index is used as a value representing the state of the environment.

[0003]

[Problems to be Solved by the Invention] At present, the odor concentration, odor index, and odor intensity are displayed as a unit by a method of displaying the gas component concentration as a measurement index of odorous gas and a so-called sensory test measured by the human sense of smell. There is a way. But,
The gas component concentration display has a drawback that it is not possible to judge the odor intensity. Only when the odor is displayed in the unit of odor, it is possible to judge the strength. Further, as a method of displaying the comfort level of the environment, there is a method of displaying as a discomfort index by a sensory test. However, a system and a device for measuring the value measured by the sensory test with an instrument have not been put into practical use. In addition, the measurement value of the so-called odor sensor currently on the market is that the odor is relatively grasped by the hertz display or the curve drawn by the graph which has no relation to the odor unit or the unit of measurement. .. An object of the present invention is to realize the values of odor concentration, odor index, odor intensity, and discomfort index measured by these sensory tests by instrumental analysis.

[0004]

[Means for Solving the Problem] Although the theory of olfaction has not been established at present, it is clear that human olfaction is measured by logarithmically converting odor. That is, a straight line is obtained by plotting the logarithmic value of the concentration and the measured value. Currently, a semiconductor gas sensor or an artificial lipid bilayer membrane attached to a crystal oscillator can be used as an odor sensor. When the logarithmic value of the odor sensor measurement value and the odor concentration is taken and shown in a graph, it becomes a straight line like the human sense of smell. However, when represented on the same graph, the two straight lines intersect because the slopes of the straight lines are different. As a result of research, when the zero value of the measuring instrument can be set correctly, that is, when there is no measurement error due to moisture, the value obtained by human sensory measurement can be obtained by instrumental measurement by designing a system tailored to the olfactory mechanism. It turned out to be.

First, in order to set a correct zero value, standard air having the same temperature and humidity as the measurement gas is prepared, and the zero value is set using the standard air, whereby the measurement error due to moisture is eliminated. Next, the value obtained by the odor sensor is adjusted to the human olfactory mechanism to obtain a logarithmic value, and then the slope is corrected to match the straight line with the human olfaction. That is, the odor intensity or discomfort index can be obtained by multiplying the logarithmic value of the measured value by a value of 1.0 or more by the sensitivity adjustment dial. The multiplication factor for sensitivity adjustment naturally depends on the quality of the odor, but for a specific gas or odor of a specific field, first pass a known gas with an odor intensity or discomfort index and adjust the sensitivity so that it is equal to that. After that, the value of the odor intensity or the discomfort index corresponding to the gas in the field can be obtained with the sensitivity.

Next, the odor index is obtained by multiplying the logarithmic value of the water-corrected measured value by 1.0 or more and then multiplying it by 10 to obtain the odor index. At this time, the sensitivity adjustment coefficient is set such that a gas having a known odor index is passed and the sensitivity adjustment coefficient is made equal to that. With a specific gas or a gas in the same field, once the sensitivity is adjusted, the odor index can be subsequently measured with the same sensitivity.

The odor concentration measured by the three-point odor bag method is measured by obtaining the inverse logarithmic value of the sensitivity-adjusted value obtained by multiplying the moisture-corrected logarithmic value by 1.0 or more. can get. As in the case described above, the multiplication factor for sensitivity adjustment is set with a sensitivity adjustment dial so that a gas having a known odor concentration is made to flow and it is matched. The multiplication factor is 1.0 or more,
This is because the human sense of smell is superior to artificial sensors. The majority of odors are possible with a multiplication factor between 1.0 and 2.0, but may be 2.0 or more for the measurement of special odors or odors in water.

Further, in order to carry out continuous measurement and continuous monitoring, a reference sensor is installed and standard air whose temperature and humidity are always equal to the humidity in the measurement gas, which fluctuates with time, is used. The objective can be achieved by automatically and continuously correcting.

Operation: The pretreatment section (1) has the function of creating standard air for setting the zero value of the odor sensor to eliminate the measurement error due to humidity, and the measurement section (2) takes the logarithmic value of the measurement value and adjusts the sensitivity. This has the effect of imitating the human sensory mechanism in a device.

[0009]

[Effect] The value measured by human sensory, odor intensity, odor concentration, odor index, and discomfort index can be measured by equipment.

[0010]

EXAMPLE An example will be described with reference to the drawings. In the zero value setting step in FIG. 1, when the power source (20) is turned on and the zero step switch (22) is pressed, the air pump (3) and the measurement gas pump (9) are turned on. The solenoid valves (16) and (18) are opened and the solenoid valve (17) is closed. The measurement gas is taken into the system through the measurement gas inlet (13), converted into a constant temperature in the thermostatic chamber (6), the humidity is measured by the humidity sensor (12), and the gas is discharged through the gas outlet (15). It is discharged outside the system. Air intake (14) according to the measured humidity
The amount of dry air passing through the silica gel filling tank (5) and the amount of saturated humidity produced in the humidification tank (7) so that the fresh air taken in becomes equal to the absolute humidity of the measurement gas by the flow rate controller (4). Control, and mix in the mixing tank (8) to make standard air having the same temperature and humidity as the measurement gas. The standard air passes through the solenoid valve (18), passes through the odor sensor (10) and is discharged from the gas discharge port (15) to the outside of the system. When the value of the measurement display unit (21) of the odor sensor (10) is sufficiently stable, the zero value is set with the zero value setting dial (25).

In the measuring process, when the measuring process switch (23) is pushed, the solenoid valve (17) is opened, the air pump (3) is stopped, and the solenoid valves (16) and (18) are closed.
The measurement gas passes through the odor sensor (10) and is discharged from the gas discharge port (15) to the outside of the system. At this time, in the case of a gas whose sensitivity adjustment coefficient is already known, the sensitivity is adjusted by the sensitivity adjustment dial (26). When measuring the odor intensity or discomfort index, press the odor intensity / discomfort index measurement switch (27), and the odor intensity or discomfort corrected by the multiplication factor by sensitivity adjustment to the logarithmic value of the value measured by the odor sensor (10). The index value is displayed on the measured value display section (21). When the odor index is measured, the odor index measurement switch (28) is pushed, and the odor index value obtained by multiplying the logarithmic value of the odor sensor (10) by 10 is added to the measured value display section (21). Displayed in. Similarly, when the odor concentration measurement switch (29) is pressed, the odor sensor (10)
The inverse logarithmic value of the value whose sensitivity is adjusted to the logarithmic value of the measured value is displayed as the odor concentration on the measured value display section (21).

In the sensor cleaning process, the so-called purging process, when the cleaning process switch (24) is pressed, the solenoid valves (16) and (17) are closed and the solenoid valve (18) is opened. The flow rate controller (4) is 100% open, and all the fresh air taken in passes through the silica gel filling tank (5), becomes dry air, and passes through the solenoid valve (18) to the odor sensor (1).
After cleaning 0), it is discharged from the system through the gas discharge port (15).

FIG. 2 shows a sensory measurement system for continuous measurement and continuous monitoring. Reference sensor (11)
The purpose can be achieved by installing. Power supply (20)
And press the zero process switch (22), the measurement gas pump (9) and the air pump (3) are activated, and the solenoid valve (1
7) is closed and solenoid valves (16), (18) and (19) are opened. Based on the same principle as the zero process described above,
Standard air having the same humidity as the standard air is produced, and the standard air is discharged from the gas discharge port (15) to the outside of the system through the odor sensor (10) and the reference sensor (11).

In the measuring process, the measuring process switch (23)
When is pressed, the air pump (3) and the measurement gas pump (9) are activated, the solenoid valves (16), (17) and (19) are opened, and the solenoid valve (18) is closed. The measurement gas continuously flows through the humidity sensor (12) and the odor sensor (10). On the other hand, similar to the measurement process described above, the standard air having the same temperature and humidity as the measurement gas passes through the solenoid valve (19), passes through the reference sensor (11), and is discharged from the gas discharge port (15) to the outside of the system. It Since the influence of moisture can be automatically corrected without being affected by the humidity of the measurement gas that changes with time, continuous measurement is possible. It should be noted that the humidity sensor (12) for measuring the humidity of the original odor gas is installed in the pretreatment unit (1) and is also installed in the measurement unit (2), and of course, there is no effect, and the humidity sensor (12) is installed in the measurement unit (2). Even when installed, it naturally belongs to the scope of the present invention. The electromagnetic valve (17) is preferably a pinch valve because it directly contacts the measurement gas.

[0015]

[Brief description of drawings]

FIG. 1 shows a flow sheet of the system.

FIG. 2 shows a system raw sheet for continuous measurement.

[Explanation of symbols]

 1 Pretreatment Part 2 Measuring Part 3 Air Pump 4 Flow Controller 5 Silica Gel Filling Tank 6 Constant Temperature Tank 7 Humidification Tank 8 Mixing Tank 9 Measuring Gas Pump 10 Odor Sensor 11 Reference Sensor 12 Humidity Sensor 13 Measuring Gas Intake 14 Air Inlet 15 Gas outlet 16, 17, 18, 19 Solenoid valve 20 Power supply 21 Measured value display 22 Zero process switch 23 Measuring process switch 24 Washing process switch 25 Zero value setting dial 26 Sensitivity adjustment dial 27 Odor intensity / discomfort index switch 28 Odor index Switch 29 Odor concentration switch

Claims (5)

[Claims] 1. A pretreatment unit (1) and a measurement unit (2), which further include an air pump (3), a flow controller (4), a silica gel filling tank (5), and a constant temperature bath. (6),
It is composed of a humidification tank (7), a mixing tank (8), and a humidity sensor (12), and a measuring unit (2) is a measurement gas pump (9) and an odor sensor (10) for measuring a value corresponding to a sensory numerical value.
And a sensory numerical value measurement system and device. 2. The value obtained by multiplying the logarithmic value of the value measured by the odor sensor (10) by the sensitivity adjusting dial (26) by 1.0 or more is displayed as the odor intensity or discomfort index. The sensory numerical value measuring system and device according to claim 1. 3. The odor index is obtained by measuring the logarithmic value of the value measured by the odor sensor (10), multiplying the value multiplied by a value of 1.0 or more by the sensitivity adjustment dial (26) by 10 and multiplying the value by 10. The sensory numerical value measuring system and apparatus according to claim 1, wherein 4. After measuring the logarithmic value of the value measured by the odor sensor (10), the sensitivity adjusting dial (26) displays the inverse logarithmic value of the value multiplied by 1.0 or more as the odor concentration. The sensory numerical value measuring system and device according to claim 1. 5. The sensory numerical value measuring system and apparatus according to claim 1, wherein a continuous sensor is provided by providing a reference sensor (11) for the odor sensor (10).