JP2846590B2 - Temperature compensation method for physical quantity of fluid - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for compensating a physical quantity of a test fluid for temperature.

[0002]

2. Description of the Related Art The Brix value, which is frequently used as an index indicating the sugar content of an undiluted juice, a juice beverage, and a soft drink, is measured by, for example, a measuring instrument capable of measuring density, refractive index, etc. with high accuracy, and the measured physical quantity is measured. It is calculated based on a more predetermined relationship.

In this case, the Brix value is determined when the fluid temperature is 20.
° C, the temperature of the test fluid is measured together with the density or the refractive index, and the density or the refractive index is measured based on the temperature compensation formula (1) shown below, for example. Temperature compensation is performed on the measured value, and the Brix value is calculated using the standard value after the temperature compensation.

D _A0 = d _AT × {1−αΔt−β (Δt) ² } (1) In the above temperature compensation equation (1), d _AT is a physical quantity (density or refractive index) of a certain test fluid A. D _A0 : standard value under standard temperature T ₀ , Δt: temperature T / standard temperature T ₀ (= 20 ° C.) Temperature difference between α and β
Is a compensation coefficient specific to the test fluid A.

[0005]

Since the compensation coefficients α and β in the temperature compensation equation (1) are specific to the test fluid A, the physical quantities are similarly calculated for the test fluid having another composition. In order to perform the temperature compensation described above, it is necessary to use a compensation coefficient having a different value from the compensation coefficients α and β.

Therefore, when the above-mentioned temperature compensation is applied to soft drinks, different kinds of soft drinks have different compositions. Therefore, a combination of a large number of compensation coefficients must be experimentally determined in advance for each kind of soft drink. did not become. In addition, there is a problem that a function of storing such a large number of compensation coefficients and switching a compensation coefficient used in the temperature compensation equation according to the type of the soft drink must be added to the measuring instrument.

[0007] Furthermore, soft drink manufacturers are constantly developing new products. Before measuring the Brix value of a new product, a compensation coefficient corresponding to the new product must be determined with a great deal of labor and labor. Spent time and had to be determined experimentally.

The present invention has been proposed in view of the above-mentioned conventional circumstances. If the physical quantity of a test fluid at a certain temperature and the temperature are measured, the composition of the test fluid is considered. It is an object of the present invention to provide a temperature compensation method capable of obtaining a physical quantity after temperature compensation without any problem.

[0009]

In order to achieve the above object, the present invention employs the following means. That is, the measured value d _T of the density or refractive index of the test fluid displaced in accordance with the temperature T of the test fluid is converted into the temperature of a physical quantity that compensates for the standard value d ₀ at the standard temperature T ₀ based on the temperature T. In the compensation method, a continuous curved surface D in a three-dimensional space as shown in FIG. 1 is experimentally specified using the measured value d _T and the temperature difference Δt between the temperature T and the standard temperature T ₀ as variables. A method of compensating for a physical quantity of a fluid in which a standard value d ₀ is calculated from the measured value d _T and the temperature difference Δt based on the continuous curved surface D.

[0010]

As shown in FIG. 1, according to the continuous curved surface D specified in the three-dimensional space, if only the measured value d _T and the temperature difference Δt are measured, a point corresponding to the combination of the two is obtained. Is obtained on the continuous curved surface D, the standard value d ₀ is immediately calculated, and there is no need to take into account the composition of the test fluid in the temperature compensation.

[0011]

1 is a conceptual diagram showing an embodiment in which the present invention is applied to temperature compensation of specific gravity using a soft drink as a test fluid.

Each point in the three-dimensional space shown in FIG. 1 can be represented by coordinates (d _T , Δt, d ₀ ). However, in the above, d _T : measured specific gravity (density), Δ
t: temperature difference between the temperature of the soft drink at the time of specific gravity measurement and the standard temperature of 20 ° C., d ₀ : standard specific gravity after temperature compensation to the standard temperature of 20 ° C.

In such a three-dimensional space, various temperature conditions are set for the soft drink A having a known standard specific gravity d _A0 , that is, the temperature difference Δt, and the measured specific gravity d _AT under each condition is set. Are measured, and points corresponding to the coordinates (d _AT , Δt, d _A0 ) obtained in this way are sequentially plotted in the three-dimensional space. At this time, since the standard value d _A0 is constant, one curve is drawn on the plane represented by the equation d ₀ = d _A0 in the three-dimensional space.

Further, for other kinds of soft drinks different from the above-mentioned soft drinks, that is, other soft drinks having different standard specific gravities d ₀ , similarly, the measured specific gravity d _T corresponding to various temperature conditions is measured.
Curves that are sequentially plotted in the dimensional space and do not intersect with the curve corresponding to the soft drink A are drawn. More
However, depending on the temperature coefficient of specific gravity,
, But at least in various soft drinks
The results confirmed experimentally do not intersect
Was.

In this manner, a continuous curved surface D as shown in FIG. 1 can be specified based on a plurality of curves drawn in the three-dimensional space. Based on the continuous curved surface D obtained as described above, if the measurement specific gravity of a certain soft drink and the temperature of the soft drink at the time of the measurement are measured, it is not referred to in specifying the continuous curved surface D. The standard specific gravity can be determined for different types of soft drinks.

That is, when determining the standard specific gravity d _B0 of the soft drink B, which was not referred to in specifying the continuous curved surface D, first, the measured specific gravity d _{BT of the} soft drink B was calculated as follows:
The temperature difference Δt _B between the temperature of the soft drink B at the time of the measurement and the standard temperature 20 ° C. is measured, and as shown in FIG. 1, a point P _B corresponding to the corresponding coordinates is obtained on the continuous curved surface D, This point P
_The standard specific gravity d _B0 can be obtained from the coordinates of _B.

The standard specific gravity d thus obtained is
_B0 was in agreement with the measured specific gravity measured after the temperature of the soft drink B was strictly adjusted so that the standard temperature was 20 ° C. within the range of the measurement error.

As described above, by applying the continuous curved surface D to a refreshing beverage in general, a compensation coefficient to be employed is changed every time the type of the refreshing beverage changes, or an operation for specifying the compensation factor experimentally is performed at all. And a standard specific gravity d _{0 that is} more accurate than the two measured values of the measured specific gravity d _T and the temperature difference Δt.
Can be calculated. As a result, the Brix value can be calculated by a unified procedure not only for the measurement of individual soft drinks but also for soft drinks of unknown components accompanying the development of new products.

It should be noted that the present invention is not limited to the above-described embodiment, and it is apparent that a continuous curved surface can be separately specified in the same procedure for a physical quantity such as a refractive index instead of the above specific gravity. It can be said that this method is also useful for the physical quantity of the test fluid on which the temperature compensation is performed.

[0020]

As described above, according to the present invention, every time the type of the test fluid is changed, the complicated operation of using the corresponding compensation coefficient is not required at all, and the density or the refractive index can be reduced. The standard value can be specified more uniquely with the measured value and the temperature of the test fluid at that time.

In particular, since a standard value can be calculated in exactly the same procedure for a new test fluid whose compensation coefficient is unknown, the work load involved in performing temperature compensation is greatly reduced. You.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of one embodiment according to the present invention.

[Explanation of symbols]

d ₀ standard value d _T measured value Δt Temperature difference between measured temperature and standard temperature D Continuous curved surface

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kyoichi Matsuo 380-16 Hidari, Nagano, Kiyama-cho, Miyoki-gun, Saga Prefecture Kitakyushu Coca-Cola Bottling Co., Ltd. (58) Field surveyed (Int.Cl. ⁶ , DB name) ) G01N 9/00-9/36

Claims (1)

(57) [Claims] The measured value (d _T ) of the density or refractive index of the test fluid displaced in accordance with the temperature (T) of the test fluid is calculated as the temperature
Standard values at standard temperature (T ₀₎ on the basis of the (T) at a temperature compensation method of a physical quantity of fluid to compensate (d _0), the measured value (d _T) and the temperature (T) · standard temperature (T ₀ ) And the standard value (d ₀ ) at the standard temperature (T ₀ )
Supports multiple samples that do not intersect with each other
Experimentally identify a continuous surface (D ) in a three-dimensional space based on a plurality of curved lines , and calculate the measured values based on the continuous surface (D).
A temperature compensation method for a physical quantity of a fluid, wherein a standard value (d ₀ ) is calculated from (d _T ) and a temperature difference (Δt).