JP2013079829A - Measurement cell and transmitted light type quality measurement apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize high measurement accuracy of a measurement of an internal quality of powder or particles, paste, or gel or sol with no specific shape as a measuring target contained in a measurement cell by use of a transmitted light type quality measurement apparatus, comparatively simplify the cleaning of the measurement cell, and improve workability.SOLUTION: A measurement cell 11 is configured by a main body 12 for containing a measuring target A with no specific shape having a horizontal bottom plate and an upper opening, and a lid body 13 to be mounted on the main body 12 so as to cover the upper opening having a horizontal plate part. In a state where the lid body 13 is mounted on the main body 12, the main body 12 and the lid body 13 are positioned so that there is formed a predetermined optical path length between an upper surface 12C of the horizontal bottom plate of the main body 12 and a lower surface 17A of the horizontal plate part of the lid body 13.

Description

  The present invention relates to a measurement cell that accommodates a measurement object and a transmitted light type quality measurement apparatus including the measurement cell.

As a quality measurement device for the measurement object, the transmitted light of the light irradiated from the light source to the measurement object is spectrally separated by the diffraction grating, the spectrum of the required wavelength is measured by the line sensor, and the measurement value measured by the line sensor is signaled. There is a transmitted light quality measuring device that performs arithmetic processing and waveform analysis by a processing / control device and performs arithmetic processing using a calibration curve (see, for example, Patent Document 1 and Patent Document 2).
When measuring the quality of a measurement object (sample) having an irregular shape such as powder, granules, paste, gel, or sol using such a transmitted light quality measuring device, A glass or plastic cuvette (see, for example, Patent Document 3) having a circular or quadrangular cross-sectional shape is widely used as a measurement cell that accommodates an irregularly shaped measurement object.

JP-A-6-213804 Japanese Unexamined Patent Publication No. 7-229840 JP-T-2001-514755

When performing measurement of transmitted light by storing the measurement object having an irregular shape in a cuvette, if the measurement object stored in the cuvette is a substance having low fluidity, the measurement object is inserted when the measurement object is inserted into the cuvette. Bubbles may enter inside the object or a space may be formed between the measurement object and the cuvette in the optical path. In such a state, the transmitted light cannot be measured accurately.
In addition, when the measurement object is a substance having low fluidity, it is very difficult to clean the cuvette.
In addition, if the measurement object accommodated in the cuvette is a powder or a granule, the transmitted light amount varies depending on the density, that is, the transmitted light cannot be measured accurately.
Therefore, it is necessary to perform measurement after the measurement object is made to have a constant density by giving a constant vibration to the measurement object such as powder or granules contained in the cuvette. Becomes worse.

  Therefore, in view of the above-described situation, the present invention intends to solve the problem by accommodating a measurement object having an irregular shape such as powder, granules, paste, gel, or sol in a measurement cell. When measuring the internal quality of an object to be measured with a transmitted light type quality measuring device, the measurement cell and transmitted light have high measurement accuracy and can perform cleaning of the measurement cell relatively easily and have high measurement workability. It is in the point which provides a formula quality measuring device.

  In order to solve the above problems, the measurement cell according to the present invention measures the internal quality of a measurement object having an irregular shape such as powder, granules, paste, gel, or sol. A measurement cell used in the apparatus, comprising: a main body having a horizontal bottom plate and an upper surface opening that accommodates the measurement object having an irregular shape; and a horizontal plate portion mounted on the main body so as to cover the upper surface opening. The main body so that a predetermined optical path length is formed between the upper surface of the horizontal bottom plate of the main body and the lower surface of the horizontal plate portion of the cover body in a state where the main body is attached to the main body. The lid is positioned.

According to such a configuration, when the lid is attached to the main body, the position between the upper surface of the horizontal bottom plate of the main body and the lower surface of the horizontal plate portion of the lid is determined to have a predetermined optical path length. The measurement accuracy can be improved by using the main body and the lid in combination so as to obtain an optical path length that provides an optimal transmitted light intensity according to the transmittance.
In addition, the main body and the lid body are positioned in the vertical direction so that the measurement object having an irregular shape is sandwiched between the horizontal bottom plate of the main body and the horizontal plate portion of the lid body, and the optical path length therebetween is provided. Since the side plate of the lid is not irradiated with light, the side plate of the main body and the lid can be tapered outward as it goes upward. Cleaning can be performed relatively easily.
In addition, since the draft angle can be secured by making the side plate of the main body and the lid body tapered outward as it goes upward, the measurement cell can be used for mass production such as injection molding of synthetic resin. Since it can be manufactured by a suitable manufacturing method, the cost can be reduced. Therefore, if the measurement cell is a measurement object that is difficult or very troublesome to clean, the measurement cell can be made disposable and workability can be reduced. Can be improved.

Here, the cover body is formed with a convex portion that protrudes downward and has a horizontal plate portion at the lower end, and presses the measurement object having an irregular shape by the lower surface of the horizontal plate portion of the convex portion, and It is preferable that a predetermined optical path length is formed between the upper surface of the horizontal bottom plate and the lower surface of the horizontal plate portion of the convex portion of the lid.
According to such a configuration, since the measurement object can be pressed by the lower surface of the horizontal plate part of the convex part of the lid body in a state where the main body and the lid body are relatively positioned, the measurement object is a substance having low fluidity. In some cases, there is no air bubbles inside the measurement object, and no space is created between the measurement object and the measurement cell in the optical path, so that the measurement accuracy is increased.
In addition, since the measurement object is pressed by the lower surface of the horizontal plate part of the convex part of the lid, when the measurement object is powder or granules, the density can be made substantially constant. , The measurement accuracy will be high.
Furthermore, since the density of the measurement object such as powder or granules can be made substantially constant by attaching a lid to the main body, the measurement object such as powder or granules can be made constant. By applying a constant vibration, the workability can be improved as compared with a configuration in which measurement is performed after the measurement object has a constant density, that is, density.

In addition, a concave portion is formed on the outer lower surface of the horizontal plate portion irradiated with the light of the lid body, the measurement object having an irregular shape is pressed by the lower surface of the horizontal plate portion of the lid body, and the horizontal surface of the main body. It is preferable that the distance between the upper surface of the bottom plate and the lower surface of the horizontal plate portion of the lid has a predetermined optical path length.
According to such a configuration, the measurement object is pressed by the lower surface of the horizontal plate portion of the lid body so that a part of the measurement object escapes into the recesses on the outer lower surface of the horizontal plate portion. Since the body can be relatively positioned, when the measurement object is a substance with low fluidity due to the pressure of the measurement object by the lower surface of the horizontal plate part of the lid, bubbles enter the measurement object, Since no space is created between the measurement object and the measurement cell in the optical path, the measurement accuracy is increased.
In addition, since the measurement object is pressed by the lower surface of the horizontal plate portion of the lid, the measurement accuracy can be made constant when the measurement object is powder or granules, that is, the density can be made substantially constant. Becomes higher.
Furthermore, since the density of the measurement object such as powder or granules can be made substantially constant by attaching a lid to the main body, the measurement object such as powder or granules can be made constant. By applying a constant vibration, the workability can be improved as compared with a configuration in which measurement is performed after the measurement object has a constant density, that is, density.

Furthermore, it is preferable that the inside of the portion where the light of the lid is irradiated is transparent, and the other portions are colored to block light in the measurement wavelength region.
According to such a configuration, since the measurement object is irradiated with light only from within the periphery of the portion where the light of the lid is irradiated, the measurement reproducibility can be further improved, and thus the measurement accuracy is further improved. Becomes higher.

Furthermore, a flange extending horizontally outward is formed at the upper end of the main body and the lid, and the lid of the lid is formed on the upper surface of the collar of the main body with the lid attached to the main body. It is preferable that the lower surface of each abut.
According to such a configuration, since the lower surface of the collar portion of the lid body abuts on the upper surface of the collar portion of the main body, it can be easily sealed by bonding these collar portions to each other. Can be prevented, and fluctuations in moisture due to drying of the measurement object can be suppressed.

  The transmitted light quality measuring apparatus according to the present invention includes the measurement cell, a drawer-shaped tray that holds the measurement cell and can be accommodated in or removed from the apparatus main body, and the measurement cell by the tray. In a state of being accommodated in the apparatus main body, light is vertically illuminated with respect to the measurement object having an irregular shape between the upper surface of the horizontal bottom plate of the main body of the measurement cell and the lower surface of the horizontal plate portion of the lid of the measurement cell. Is provided with light projecting means for irradiating light, light receiving means for receiving transmitted light from the measurement object, and spectroscopic analyzing means for spectrally analyzing the transmitted light.

  According to such a configuration, the same effect as that of the measurement cell can be obtained, and the measurement cell can be easily held in the apparatus main body by being held by the drawer-shaped tray. Is received in the apparatus main body, the light projecting means irradiates light to the measurement object in the vertical direction, the light receiving means receives the transmitted light from the measurement object, and the transmitted light is received by the spectroscopic analysis means. By performing spectroscopic analysis, the internal quality of the measurement object can be measured, and after the measurement is completed, the measurement cell can be easily taken out by pulling out the drawer-shaped tray, thus improving workability. it can.

  As described above, according to the measurement cell and the transmitted light quality measurement device according to the present invention, (a) when the lid is attached to the main body, the upper surface of the horizontal bottom plate of the main body and the lower surface of the horizontal plate portion of the lid Is positioned so as to have a predetermined optical path length, so by using a combination of the main body and the lid so as to obtain an optical path length that provides an optimal transmitted light intensity according to the transmittance of the measurement object, The measurement accuracy can be improved, and (a) the side plate of the main body and the lid can be tapered outward as it goes upward. (C) The measuring cell is suitable for mass production such as injection molding of synthetic resin by making the side plate of the main body and lid body taper outward as it goes upward. Manufactured by different manufacturing methods Since it is possible to reduce costs, it is possible to improve the workability by making the measurement cell disposable when the measurement cell is difficult or very troublesome to measure. (D) By attaching the lid to the main body, the measurement object is pressed on the lower surface of the horizontal plate part of the lid, so that the generation of bubbles and the like is suppressed when the measurement object is a low-fluidity substance. (E) Since the measurement object is pressed on the lower surface of the horizontal plate portion of the lid by attaching the lid to the main body, the measurement object is powder or In other words, since the density can be made substantially constant in the case of a granule or the like, significant effects such as improved measurement accuracy and improved workability can be obtained.

It is a perspective view which shows the external appearance of the transmitted light type quality measuring apparatus which concerns on embodiment of this invention. Similarly, it is a front view, and the internal light projecting means and light receiving means are indicated by broken lines. The tray which accommodates a measurement cell is shown, (a) is a top view, (b) is a vertical front view, (c) is a perspective view. The main body of a measurement cell is shown, (a) is a top view, (b) is an arrow X1-X1 sectional view of (a), and (c) is a perspective view. The lid of a measurement cell is shown, (a) is a top view, (b) is an arrow X2-X2 sectional view of (a), and (c) is a perspective view. It is a vertical front view which shows the usage method of a measurement cell, (a) has shown the state which accommodated the measurement object of the irregular shape in a main body, (b) has shown the state which mounted | wore the main body with the cover body. It is a vertical front view which shows the state which attached the measurement cell of FIG.6 (b) to the tray, and was set to the transmitted light type | formula quality measuring device. It is a vertical front view which shows the variation of a cover body, (a) is the example which lengthened optical path length rather than FIG.6 (b), (b) is the example which lengthened optical path length further than (a), ( c) shows an example in which the optical path length is made longer than in (b). 8C shows the lid of FIG. 8A, FIG. 8A is a plan view, FIG. 8B is a sectional view taken along the line X3-X3 in FIG. 8A, and FIG. The example which made the part other than the baseplate of a cover body the color which interrupts | blocks the light of a measurement wavelength range is shown, (a) is a top view, (b) is arrow X4-X4 sectional drawing of (a). It is a vertical front view which shows the structural example which forms the collar part extended horizontally outwards in the upper end part of a cover body, and overlaps this collar part on the upper surface of the collar part of a main body. The example of a structure which abrades and seals a non-standard-shaped measuring object when attaching a cover to a main part is shown, (a) is a vertical side view, (b) is a perspective view.

  Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments shown in the accompanying drawings, and includes all the embodiments that satisfy the requirements described in the claims. It is a waste.

As shown in the perspective view of FIG. 1 and the front view of FIG. 2, the transmitted light quality measuring device 1 according to the embodiment of the present invention is a small and light-weight device that is easy to carry and accommodates a measurement object. In a state where a measurement cell, which will be described later, is held by the drawer-shaped tray 2 and accommodated in the apparatus main body, a required operation is performed by the operation unit 7, and light is projected downward by the light projecting means 9 positioned above the measurement object ( For example, near-infrared light (L) is irradiated, the transmitted light is received by the light receiving means 10 located below the measurement object, and the transmitted light is spectrally analyzed by a spectral analysis means (not shown) to thereby determine the internal quality of the measurement object. The measurement result is displayed on the display unit 8.
Here, the spectroscopic analysis means includes, for example, a spectroscope that spectrally processes the transmitted light from the measurement object received by the light receiving means 10, a line sensor that measures the spectrum of the required wavelength, an arithmetic process and a waveform of the measurement value. It consists of a signal processing / control device and the like that perform analysis and arithmetic processing using a calibration curve.

As shown in the plan view of FIG. 3 (a), the longitudinal front view of FIG. 3 (b), and the perspective view of FIG. 3 (c), the tray 2 is composed of an accommodating part 3 and a knob part 4, for example, polypropylene, nylon or It is made of an opaque synthetic resin such as ABS, and can be taken out by sliding with respect to the main body of the transmitted light quality measuring device 1 of FIG. It is a drawer-shaped one.
The storage portion 3 of the tray 2 is a box having a bottom and an upper surface opening. A step portion 5 is provided at the upper end portion of the storage portion 3, and a through hole 6A and a through hole are provided in the bottom plate and the side plate of the storage portion 3, respectively. 6B and 6B are formed.

As shown in the plan view of FIG. 4 (a), the longitudinal front view of FIG. 4 (b), and the perspective view of FIG. 4 (c), the main body 12 of the measuring cell 11 has a substantially rectangular horizontal bottom plate and its outer peripheral portion. It is formed by a side plate that rises from the top and has a cup shape with an opening on the upper surface.The side plate has a tapered shape that inclines outward as it goes upward, and the upper surface is formed horizontally at the four corners inside the side plate. Are provided, and the upper end of the side plate is bent outward to form a horizontally extending flange 15.
Further, as shown in the plan view of FIG. 5A, the longitudinal front view of FIG. 5B, and the perspective view of FIG. 5C, the lid 13 of the measurement cell 11 has a horizontal shape whose outer periphery is substantially rectangular. A convex portion formed by a lid portion 16 formed by a plate portion and a side plate rising from an outer peripheral portion thereof, a side plate protruding downward, and a horizontal plate portion connected to a lower end edge thereof. 17 and the side plate of the cover part 16 and the side plate of the convex part 17 are tapered so as to incline outward as they go upward.
Here, the main body 12 and the lid body 13 are made of, for example, a transparent synthetic resin such as transparent polystyrene, polyethylene terephthalate, or polycarbonate, or transparent glass.

Next, a method for using the measurement cell will be described.
First, as shown in the longitudinal front view of FIG. 6 (a), a powder, granule, or paste that is a food, agricultural product, cosmetic, chemical, or the like is formed on the bottom 12 of the measurement cell 11 and has an upper surface opening. A measurement object A having an irregular shape such as a gel or sol is inserted.
The amount of the measuring object A accommodated in the main body 12 does not need to be a strict amount, and is an amount that is pressed by the lower surface 17A of the horizontal plate portion of the convex portion 17 when the lid 13 is attached to the main body 12. To do.
After putting the measuring object A in the main body 12 in this way, when the lid 13 is attached to the main body 12 as shown by the arrow in FIG. 6A, as shown in the longitudinal front view of FIG. The outer side surface 16B of the side plate of the lid portion 16 of the lid body 13 abuts on the inner side surface 12B of the side plate of the main body 12 for relative positioning in the horizontal direction, and the upper surface of the step portions 14, 14,. The lower surface 16A of the horizontal plate portion of the portion 16 is brought into contact with and is relatively positioned in the vertical direction, and the measurement object A is pressed by the lower surface 17A of the horizontal plate portion of the convex portion 17, and the horizontal bottom plate upper surface 12C of the main body 12 and the lid A space between the convex portion 17 of the body 13 and the horizontal plate portion lower surface 17A is a predetermined optical path length H1.

In the state where the measurement object A is accommodated in the measurement cell 11 as described above, the measurement cell 11 is accommodated in the accommodation portion 3 of the tray 2 as shown in the longitudinal sectional view of FIG. In this state, the bottom plate of the main body 12 of the measuring cell 11 is in contact with the bottom plate of the housing portion 3, and the lower surface 15 </ b> A of the flange portion 15 at the upper end of the main body 12 is in contact with the upper surface of the step portion 5 of the housing portion 3. Since the upper end portion of the portion 3 and the upper end portion of the main body 2 are engaged, the measurement cell 11 is relatively positioned with respect to the tray 2.
Therefore, the tray 2 holding the measurement cell 11 is housed in the main body of the transmitted light type quality measuring device 1 as described above, and the light L is emitted from the light projecting means 9 as shown in FIGS. By receiving the transmitted light by the light receiving means 10, the internal quality of the measuring object A is measured by the above-described spectroscopic analysis.

With respect to the main body 12 and the lid body 13 used in combination so as to have a predetermined optical path length H1 as shown in FIG. 6B, the optical path lengths H2 and H2 shown in the examples of FIGS. The predetermined optical path length can be easily changed like H3 and H4.
That is, FIG. 8A and FIG. 8B are examples in which the optical path lengths H2 and H3 are set by changing the protruding amount of the convex portion 17 of the lid 13, and FIG. In this example, the predetermined optical path length H4 is eliminated.
Here, the lid 13 of the measurement cell 11 in FIG. 8C is also shown in the plan view of FIG. 9A, the longitudinal sectional view of FIG. 9B, and the perspective view of FIG. 9C. Concave portions 18 are formed on the outer lower surface of the horizontal plate portion irradiated with the light from the lid body 13, and in the measurement cell 11 of FIG. 8C, the measurement is performed by the horizontal plate portion lower surface 16 A of the lid body 13. The object A is pressed and a part of the measurement object A is released in the recesses 18, 18. The main body 12 and the lid body 13 are relatively positioned in this state, and the horizontal bottom plate upper surface 12 C and the lid body of the main body 12 are positioned. A predetermined optical path length H4 is formed between the 13 horizontal plate portion lower surfaces 16A.

According to the measurement cell 11 having the above-described configuration, when the lid body 13 is attached to the main body 12, a predetermined optical path length is formed between the horizontal bottom plate upper surface 12C of the main body 12 and the horizontal plate portion lower surfaces 17A and 16A of the lid body 13. (For example, H1, H2, H3, H4), the main body 12 and the lid body 13 are set so as to have an optical path length that provides an optimum transmitted light intensity according to the transmittance of the measurement object A. Can be used in combination to improve measurement accuracy.
Further, the main body 12 and the lid body 13 are positioned in the vertical direction so that the measuring object A is sandwiched between the horizontal bottom plate of the main body 12 and the horizontal plate portion of the lid body, and the optical path length is provided between them. Since the side plate of the body 13 is not irradiated with light, the side plate of the main body 12 and the lid body 13 can be tapered outwardly as it goes upward. The cell 11 (the main body 12 and the lid body 13) can be cleaned relatively easily.
Further, since the draft angle can be ensured by making the side plates of the main body 12 and the lid body 13 incline outward as they go upward, the measurement cell 11 can be mass-produced such as injection molding of synthetic resin. Therefore, the measurement cell 11 can be made disposable when the measurement cell 11 is a measurement object that is difficult or very troublesome to clean. Workability can be improved.

Furthermore, in a state where the main body 12 and the lid body 13 are relatively positioned, as shown in FIGS. 6B, 8A and 8B, the horizontal plate portion lower surface 17A of the convex portion 17 of the lid body 13 or Since the measuring object A can be pressed by the lower surface 16A of the horizontal plate portion of the lid 13 as shown in FIG. 8C, when the measuring object A is a substance with low fluidity, the measuring object A The measurement accuracy is improved because there is no air bubbles inside and no space is created between the measurement object A and the measurement cell in the optical path.
In addition, since the measuring object A is pressed by the horizontal plate lower surface 17A or the horizontal plate lower surface 16A of the convex portion 17 of the lid 13, when the measuring object A is powder or granules, that is, Since the density can be made substantially constant, the measurement accuracy is increased.
Furthermore, since the density of the measuring object A that is a powder or a granule can be made substantially constant by attaching the lid 13 to the main body 12, the measuring object A that is a powder or a granule or the like. As compared with the configuration in which the measurement object A is made to have a constant density, that is, the measurement is performed by applying a constant vibration to the above, workability can be improved.

Furthermore, as shown in the plan view of FIG. 10 (a) and the longitudinal front view of FIG. 10 (b), in the periphery of the portion irradiated with the light L (see FIG. 7) of the lid 13 (see FIG. 10). In an example, the horizontal plate portion (bottom plate) of the convex portion 17 may be transparent, and the other portion may be colored B that blocks light in the measurement wavelength range by applying paint or changing the material.
By doing in this way, since the measurement object A is irradiated only from within the periphery of the portion irradiated with the light of the lid 13, the measurement reproducibility can be further improved, and further measurement is performed. Increases accuracy.

Further, as shown in the longitudinal front view of FIG. 11, a flange portion 19 extending horizontally outward is formed at the upper end portion of the lid body 13 (lid portion 16), and the lid body 13 is attached to the main body 12. You may comprise so that the lower surface of the collar part 19 of the cover body 13 may contact | abut on the upper surface of the collar part 15 of the main body 12. FIG.
According to such a configuration, since the lower surface of the flange portion 19 of the lid body 13 abuts on the upper surface of the flange portion 15 of the main body 12, the flange portions 15 and 19 can be easily sealed by bonding them together. Therefore, it is possible to prevent leakage of the measuring object A and to suppress fluctuations in moisture due to drying of the measuring object A.
The flanges 15 and 19 may be bonded to each other by manufacturing the main body 12 and the lid body 13 from a thermoplastic material and bonding them by thermal welding or ultrasonic welding, or by an adhesive.

In the above description, the configuration in which the lid 13 is mounted from above the main body 12 as shown in FIG. 6A is shown. However, in the longitudinal side view of FIG. 12A and the perspective view of FIG. As shown, a stepped portion 14A is formed at the upper end portion of the cup-shaped main body 12A, and the horizontal plate lower surface 13B of the substantially rectangular lid body 13A is mounted while sliding from one side of the upper end portion of the main body 12A. It is good also as a structure.
According to such a configuration, the measurement object A having an irregular shape such as powder or granules is piled up on the main body 12A, and the lid 13A is slid as indicated by an arrow C in FIG. The lid 13A can be attached to the main body 12A while scraping the measurement object A. In this example, a predetermined optical path is formed between the horizontal bottom plate upper surface 12C of the main body 12A and the horizontal plate lower surface 13B of the lid 13A. Become long.

A Measurement object B Color L that blocks light in the measurement wavelength range Projected light H1, H2, H3, H4 Optical path length 1 Transmitted light quality measuring device 2 Tray 3 Storage section 4 Pick section 5 Step section 6A, 6B Through hole 7 Operation unit 8 Display unit 9 Light projecting unit 10 Light receiving unit 11 Measurement cell 12, 12A Main body 12B Inner side surface 12C Horizontal bottom plate upper surface 13, 13A Lid 13B Horizontal flat plate unit lower surface 14, 14A Step unit 15 Gutter unit 15A Lower surface 16 Lid unit 16A Horizontal plate lower surface 16B Outer surface 17 Convex portion 17A Horizontal flat plate lower surface 18 Concave portion 19

Claims (6)

A measurement cell used in a transmitted light quality measuring device for measuring the internal quality of a measurement object having an irregular shape such as powder, granules, paste, gel or sol,
A main body having a horizontal bottom plate and an upper surface opening that accommodates the measurement object having an irregular shape;
A lid having a horizontal plate portion, which is attached to the main body so as to cover the upper surface opening,
With the lid attached to the main body, the main body and the lid are positioned so that a predetermined optical path length is provided between the upper surface of the horizontal bottom plate of the main body and the lower surface of the horizontal plate portion of the lid. A measurement cell.   A convex part having a horizontal plate part at the lower end is formed on the lid body, the convex part having a horizontal plate part is formed at the lower end, and the measurement object having an irregular shape is pressed by the lower surface of the horizontal plate part of the convex part, and the upper surface of the horizontal bottom plate of the main body The measurement cell according to claim 1, wherein a predetermined optical path length is formed between the projection and the lower surface of the horizontal plate portion of the lid.   A concave portion is formed on an outer lower surface of the horizontal plate portion irradiated with light from the lid body, and the measurement object having an irregular shape is pressed by the lower surface of the horizontal plate portion of the lid body, and an upper surface of the horizontal bottom plate of the main body The measuring cell according to claim 1, wherein a predetermined optical path length is formed between the lower plate and the lower surface of the horizontal plate portion of the lid.   The measurement cell according to any one of claims 1 to 3, wherein the inside of the portion where the light of the lid is irradiated is made transparent, and the other portions are colored to block light in the measurement wavelength region. .   A flange extending horizontally outward is formed at the upper end of the main body and the lid, and the lower surface of the collar of the lid is on the upper surface of the collar of the main body with the lid mounted on the main body. The measurement cell according to any one of claims 1 to 4, which abuts. The measurement cell according to any one of claims 1 to 5,
A drawer-shaped tray that holds the measurement cell and can be accommodated in the apparatus body or taken out from the apparatus body;
The measurement object having an irregular shape between the upper surface of the horizontal bottom plate of the main body of the measurement cell and the lower surface of the horizontal plate portion of the lid of the measurement cell in a state where the measurement cell is accommodated in the apparatus main body by the tray. A light projecting means for irradiating light vertically with respect to
A light receiving means for receiving transmitted light from the measurement object;
A spectroscopic analysis means for spectroscopically analyzing the transmitted light;
Transmitted light quality measuring device.

Images