JPH07110294A - Sample tool for infrared analysis device - Google Patents

Abstract

PURPOSE:To increase the accuracy in qualitative determination of infrared ray analysis by a liquid sample with specific thickness and position. CONSTITUTION:A first flat plate 1 which has a groove 11 at a specific position and depth and is an infrared ray transparent crystal and a second flat plate 3 which is an infrared ray transparent crystal are stacked opposingly via a groove 11. In this case, at least one of the first flat plate and second flat plate is a visible light transparent crystal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sample jig for an infrared analyzer, and more particularly to a sample jig for a liquid sample.

[0002]

2. Description of the Related Art An infrared analyzer is an apparatus for measuring an infrared absorption spectrum of a substance and performing an infrared spectroscopic analysis. Depending on the type of spectroscopic means, a Fourier transform infrared analyzer), a diffraction grating infrared analyzer There are various devices such as a device and a prism type infrared analyzer, but the former two are mainly on the market.

The Fourier transform infrared analyzer has a diameter of 1 m.
A Fourier transform type infrared microscopic analyzer for measuring a microscopic region of m or less in combination with an infrared microscopic unit is also known. A Fourier transform type infrared microanalyzer collects infrared light from a light source with a microscopic unit to illuminate a micro sample, converts the transmitted infrared light into an electrical signal with a detector, and processes this signal as data. It is a device that displays the infrared spectrum by performing Fourier transform.

In the Fourier transform type microscopic infrared analyzer, when a small amount of liquid sample is analyzed, the liquid sample is dropped on the infrared optical crystal flat plate for measurement. FIG. 5 is a sectional view showing a hemispherical liquid sample. The solid sample in the solvent also shows the same shape after the solvent is evaporated by the same treatment. The thickness of the sample that gives a good infrared spectrum in the infrared analyzer is in the range of 1 to 20 μm.

[0005]

However, the thickness of the conventional hemispherical liquid sample as described above cannot be controlled, and usually exhibits a thickness of several 100 μm. Furthermore, the position of the sample is decided by chance, and it may be fixed at a position where analysis is impossible. The present invention has been made in view of the above points, and an object thereof is to provide a sample jig for an infrared analysis device capable of controlling the thickness and position of a liquid sample by improving the sample jig. .

[0006]

According to the present invention, there is provided a first flat plate and a second flat plate, the first flat plate having a groove at a predetermined position and a depth on the main surface. Having an infrared transparent crystal, the second flat plate is an infrared transparent crystal, at least one of the first flat plate and the second flat plate is a visible transparent crystal, the first flat plate and the second flat plate. The flat plates are achieved by being laminated so as to face each other via the grooves of the first flat plate.

[0007]

Since the first flat plate has the groove at the predetermined position and the predetermined depth on the main surface, the thickness and position of the liquid sample in the infrared analyzer can be accurately controlled. Visible transparent crystals indicate the injection status of the liquid sample.

[0008]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a sectional view showing a sample jig for an infrared analyzer according to an embodiment of the present invention. FIG. 2 is a perspective view showing the first flat plate of the sample jig for an infrared analyzer according to the embodiment of the present invention with the top and bottom reversed.

The flat plate 1 is a disk made of potassium bromide, and has a through hole 12 having a diameter of 5 mm at the center. Rectangular grooves 11 are formed in one main surface of the flat plate 1 radially from the center at equal angles. The flat plate 3 is a disk made of potassium bromide. The flat plate 1 and the flat plate 3 are laminated on each other via the grooved surface of the flat plate 1.

The liquid sample 2 forms a meniscus due to the surface tension, and a part of the groove is completely filled with the liquid sample 2. Outer diameter in the range of 10 to 50 mm, thickness of 1 to 20 m
Discs of potassium bromide in the m range can be used. A through hole having an inner diameter of 1 to 10 mm is formed.

A rectangular groove having a groove width of 1 to 5 mm and a groove depth of 1 to 20 μm is formed. The depth of one groove is constant over the entire length. Both of the two discs are made of infrared transparent optical crystals. The disc close to the naked eye is required to be transparent to visible light. This is to confirm the liquid sample. Crystals that are transparent to infrared light and transparent to visible light can be selected from potassium bromide KBr, KRS-5, zinc selenide ZnSe, or sodium chloride NaCl.

Since the disk away from the naked eye does not necessarily need to be transparent to visible light, silicon or germanium can be used. FIG. 3 is a perspective view showing a step of injecting a liquid sample into a sample jig for an infrared analyzer. The liquid sample is injected via the syringe 4 inserted in the through hole 12. Further, the through hole 12 prevents the liquid sample in the rectangular groove 11 from moving to another groove. A liquid in which a solid is dispersed is also injected in the same manner.

FIG. 4 is a diagram showing a microscopic infrared spectrum (b) according to an embodiment of the present invention in comparison with a conventional infrared spectrum (a). Sample is uncured UV resin Freon 113 solvent 3%
It is a solution. The solvent was sufficiently evaporated before the measurement. When droplets are formed by the conventional method, there is a thickness of about 500 μm even after the solvent is scattered, the peak of strong absorption shows a saturation value of zero transmittance, and the difference from the transmittance of weak absorption peak disappears. To do.

In the infrared absorption spectrum according to the present invention, since the thickness of the liquid sample is controlled to a predetermined value, each peak shows correct transmittance, and accurate information on the partial structure of the molecule can be obtained.

[0015]

According to the present invention, there are provided a first flat plate and a second flat plate, and the first flat plate is an infrared transparent crystal having grooves at predetermined positions and depths on its main surface, The second flat plate is an infrared transparent crystal, at least one of the first flat plate and the second flat plate is a visible transparent crystal, the first flat plate and the second flat plate of the first flat plate. Since it is assumed that the first flat plate is laminated to face each other through the groove, the first flat plate has a groove of a predetermined position and a depth on the main surface so that the thickness and the position of the liquid sample in the infrared analyzer are Control precisely. As a result, an infrared absorption spectrum showing correct transmittance and reproducibility is obtained, and the accuracy of qualitative and quantitative analysis by infrared analysis is improved.

[Brief description of drawings]

FIG. 1 is a sectional view showing a sample jig for an infrared analyzer according to an embodiment of the present invention.

FIG. 2 is a perspective view showing the first plate of the sample jig for an infrared analyzer according to the embodiment of the present invention with the top and bottom reversed.

FIG. 3 is a perspective view showing a step of injecting a liquid sample into a sample jig for an infrared analyzer.

FIG. 4 is a diagram showing a microscopic infrared spectrum according to an example of the present invention in comparison with a conventional infrared spectrum.

FIG. 5 is a sectional view showing a hemispherical liquid sample.

[Explanation of symbols]

 1 flat plate 2 liquid sample 3 flat plate 11 rectangular groove 12 through hole

Claims (4)

[Claims] 1. A first flat plate and a second flat plate, wherein the first flat plate is an infrared transparent crystal having a groove at a predetermined position and a predetermined depth on the main surface, and the second flat plate is Infrared transparent crystal, at least one of the first flat plate and the second flat plate is a visible transparent crystal, the first flat plate and the second flat plate are mutually connected through the groove of the first flat plate. A sample jig for an infrared analysis device, characterized in that the jigs are laminated facing each other. 2. The sample jig for an infrared analyzer according to claim 1, wherein the predetermined depth is in the range of 1 to 20 μm. 3. A sample jig for an infrared analyzer according to claim 1, wherein the first flat plate has a through hole provided at the center of the main surface, and the groove is radially provided from the through hole. A sample jig for an infrared analysis device, characterized in that 4. The sample jig for an infrared analyzer according to claim 1, wherein the first flat plate and the second flat plate are potassium bromide KBr, KRS-.
5, A sample jig for an infrared analyzer, which is zinc selenide ZnSe or sodium chloride NaCl. 5. The sample jig for an infrared analysis device according to claim 1, wherein the infrared analysis device is a Fourier transform type microscopic infrared analysis device.