JPH089632Y2 - Measuring container for infrared moisture analyzer - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an infrared moisture meter for measuring the water content of a sample based on the absorbance of near-infrared measuring light applied to the sample, and an infrared moisture meter used for accommodating the sample at the time of measurement. For measuring containers.

[0002]

2. Description of the Related Art Conventionally, an infrared moisture meter alternately irradiates a sample with a measurement infrared ray in the near infrared region which exhibits a high absorption property for moisture and a reference infrared ray which is difficult to be absorbed by moisture at a wavelength near the measurement infrared ray. Then, the light amount ratio of diffuse reflection light or transmitted light by the sample of the measurement infrared ray and the reference infrared ray is taken as the absorbance value for the measurement infrared ray, and the water content of the sample is calculated based on the regression equation obtained in advance showing the correlation between the absorbance and the water content. Is to seek.

Here, when the sample is a liquid, since the surface diffusion of light is small, it is common to obtain the water content from the ratio of the amount of transmitted light. If the optical path length, that is, the thickness of the sample is large, it is significantly attenuated. For this reason, as shown in FIG. 7, an optical cell 10 made of quartz glass in which a thin gap 10a having a thickness d of, for example, about 1 mm is formed is used as a measuring container.

FIG. 8 is a diagram showing a measurement state in an infrared moisture meter using the optical cell 10. The optical cell 10 into which the liquid sample S is injected is arranged at an inclination, and the light source of the infrared moisture meter is shown. The measurement infrared light and the reference infrared light from 20 are obliquely incident on the optical cell 10 from above. The measurement infrared ray and the reference infrared ray pass through the optical cell 10 and the sample S and enter the light reflecting plate 30.
The light is reflected (diffuse reflection) at 0, passes through the optical cell 10 and the sample S again, and is received by the light receiving unit 40. Then, from the amount of light received by the light receiving section 40, the absorbance of the sample S due to infrared absorption is obtained, and the water content of the sample S is measured.

[0005]

However, according to the conventional optical cell 10 as described above, since the opening of the gap 10a is narrow, not only is it troublesome to take in and out the sample, but also the precipitate and the deposit in the gap 10a are required. It was difficult to clean the kimono. In particular, a highly viscous sample has a problem that it is very difficult to take it in and out, and that the filling state of the sample is likely to be nonuniform, which causes a measurement error at each position of the measurement surface.

Incidentally, the measurement of the water content of such various samples is frequently performed at various production control sites such as the tobacco manufacturing process, but the conventional optical cell is not very convenient as described above. There is a problem of lack of practicality. Further, the conventional optical cell 10 is difficult and expensive to manufacture because quartz glass must be molded.

An object of the present invention is to provide a measuring container which is easy to take in and out, is easy to wash, is easy to manufacture, and is inexpensive.

[0008]

[Means for Solving the Problems] The measuring container for an infrared moisture meter of the present invention made to solve the above problems measures the water content of a sample based on the absorbance of the near-infrared measuring light with which the sample is irradiated. infrared moisture analyzer a measurement vessel used to contain the sample, the two space a circular opening window forming a space for accommodating the sample is formed respectively to
And the thickness of each is uniform and the thicknesses are different
Two spacers that are transparent to the near infrared measurement light
With a sample plate that is adhered to the front and back of a glass plate with a uniform thickness, and is transparent to the near-infrared measurement light, adheres to the spacer and has a thickness not fixed to the spacer.
And a uniform cover glass.

[0009]

In the measuring container for infrared moisture meter of the present invention, the sample pan is composed of the glass plate and the spacer bonded to the glass plate, and the sample is stored in the opening window of the spacer with the glass plate as the bottom. can do. Further, the sample can be easily taken in and out of the opening window and the inside of the opening window can be easily washed. Also, manufactured by adhering members cut out from plate glass, etc.
can do. In addition, two sheets with different thickness
There are two types of housings with different depths.
Infrared rays are transmitted through one measuring container depending on the type of sample.
The versatility is enhanced by selecting the thickness to be applied. Since each spacer has a uniform thickness and the cover glass is in close contact with this spacer, the sample should be housed in the opening window and the opening window should be sealed with the cover glass. You can

[0010]

1 is a perspective view showing a measuring container according to an embodiment of the present invention, FIG. 2 is a sectional view, and FIG. 3 is an exploded perspective view. The measuring container A is composed of a sample dish 1 and a cover glass 2. ing. The sample dish 1 is composed of a circular glass plate 11 and glass-made ring-shaped first and second spacers 12 and 13 having the same outer diameter as the glass plate 11 and having opening windows 12a and 13a. The structure is such that the first and second spacers 12 and 13 are adhered around the front and back sides of the glass plate 11, respectively.
The cover glass 2 is a circular glass plate having the same outer diameter as the sample dish 1.

The first spacer 12 and the second spacer 13
Have different thicknesses and open windows 1 with different depths.
2a and 13a form dish-shaped accommodating portions having different depths on both front and back sides with the glass plate 11 as a bottom, and the sample is accommodated in the accommodating portions. In addition, each spacer 12, 13
The adhesive parts of are water and oil resistant.

The surfaces of the spacers 12 and 13 and the cover glass 2 are each made into a uniform plane, and the cover glass 2 is attached to the spacer 12 in the state where the sample is put in the accommodating portion.
(Or the spacer 13) can be closely attached to the lid.

The cover glass 2 and the glass plate 11 are made of a glass material (for example, "Tempax") which easily transmits near infrared rays, and the spacers 12 and 13 are made of a normal glass material. Also, these cover glasses 2,
The glass plate 11 and the spacers 12 and 13 are obtained by cutting a plate glass into a circular shape or a ring shape and polishing a cut portion, and can be easily manufactured.

FIG. 4 is a diagram showing a usage state of the measuring container A of the embodiment, and as shown in the drawing, the measuring container A is used in a tabletop moisture meter. That is, tabletop moisture meter 3
Is equipped with a circular turntable 31, and the water content is measured by placing the measurement container A containing the sample on the turntable 31. At this time, the turntable 31 is rotated, and the near-infrared measuring light and the near-infrared reference light from the upper infrared light source 32 are applied to the measuring container A, and the measuring container A and the sample S are transmitted as shown in FIG. The infrared rays
The light is reflected by the reflection surface 31 a of the turntable 31, is further transmitted through the measurement container A and the sample S, and is received by the light receiving section (FIG. 4) 33.

When the sample is placed in the sample dish 1, for example, in the case of a powdery sample, the surface of the spacer 12 (or the spacer 13) is slid and filled to cover the glass 2.
If the sample is liquid, the cover glass 2 is put in slightly more than the surface of the spacer 12 (or the spacer 13) and the cover glass 2 is adhered so that air bubbles do not mix inside. By doing so, the thickness of the sample becomes uniform and the measurement error can be reduced.

As described above, the measuring container A has a structure in which the sample is placed in the shallow sample dish 1 and the lid is covered with the cover glass 2. Therefore, the sample container is easy to take in and out and is easy to wash. Is good. Therefore, the measurement does not take time and repeated measurement can be performed quickly.

Further, in the measuring container of this embodiment, the two types of accommodating portions having different depths are formed by the two spacers 12 and 13 having different thicknesses, so that infrared rays are transmitted depending on the type of sample. The thickness to be applied can be selected. In addition, the size of the measuring container of the example is such that the outer diameter is 76 mm, the inner diameter is 60 mm, the thickness of the cover glass 2, the glass plate 11 and the first spacer 12 is 1 mm, and the second spacer 1 is
The thickness of 3 is 3 mm.

When the measurement was carried out using the same measuring container as in the example, a correlation could be obtained between the measured water content (% WB) and the absorbance value, as shown in FIG. like this
Moreover , the measurement can be performed with the same accuracy as that of the conventional optical cell. Note that FIG. 6A shows a measurement result of water in soup when a container with a spacer thickness (sample thickness) of 0.5 mm is used, and FIG. 6B shows a spacer thickness of 1 mm. The measurement results of water such as alcohol when using a container are shown.

In the above embodiment, the glass plate 11, the spacers 12 and 13 and the cover glass 2 are formed by cutting out the plate glass. However, the glass plate 11 and the cover glass 2 transmit near infrared measurement light. The material is not limited to the example as long as it has good properties.

[0020]

As described above, the measuring container for an infrared moisture meter according to the present invention has a circular shape which forms a space for containing a sample.
Two spacers each having an open window of
Two spacers , each of which has a uniform thickness and a different thickness, are provided on the front and back of a glass plate that is transparent to near-infrared measuring light and has a uniform thickness. a sample dish formed by bonding, space as well as in close contact with the transparent the spacer with respect to near-infrared measurement light
It is composed of a cover glass with a uniform thickness that is not fixed to the sensor, and the glass plate is the bottom, so that the sample can be stored in the opening window of the spacer and the opening window can be sealed with the cover glass. It is easy to use because it is easy to put in and take out samples and wash them. Also, attach a member that is cut out from plate glass, etc.
Since it can be worn and manufactured, the measurement container is simple and inexpensive to manufacture. Two types with two spacers of different thickness
The storage units with different depths are
Depending on the type of sample, the thickness of the infrared transmission
The versatility is enhanced by making selections.

[Brief description of drawings]

FIG. 1 is a perspective view of a measuring container according to an embodiment of the present invention.

FIG. 2 is a vertical sectional view of a measuring container according to an embodiment of the present invention.

FIG. 3 is an exploded perspective view of a measuring container according to an embodiment of the present invention.

FIG. 4 is a diagram showing a usage state of the measurement container according to the embodiment of the present invention.

FIG. 5 is a partially enlarged view showing a usage state of the measuring container according to the embodiment of the present invention.

FIG. 6 is a diagram showing an example of measurement results in the embodiment of the present invention.

FIG. 7 is a perspective view of a conventional optical cell.

FIG. 8 is a diagram showing a usage state of a conventional optical cell.

[Explanation of symbols]

 A Measuring container 1 Sample dish 2 Cover glass 11 Glass plate 12 First spacer 13 Second spacer 12a, 13a Open window

Claims (1)

[Scope of utility model registration request] 1. A measuring container used for accommodating the sample in an infrared moisture meter for measuring the water content of the sample based on the absorbance of near-infrared measuring light applied to the sample, for accommodating the sample its circular opening window forming a space
Respective thicknesses a two spacers which are respectively formed
Of two glass plates having a uniform thickness and different thicknesses from each other are formed on a glass plate that is transparent to the near-infrared measuring light and has a uniform thickness .
A sample dish that is adhered to the front and back sides , and transparent to the near-infrared measurement light, adheres closely to the spacer, and is not fixed to the spacer and has a uniform thickness
Infrared moisture meter measuring container, characterized in that it comprises a a cover glass.