JPH0240525Y2 - - Google Patents

Description

[Detailed Description of the Invention] A. Field of Industrial Application The present invention relates to a device used for sample exchange in a spectrophotometer.

B. Conventional technology When installing a sample in the sample chamber with a spectrophotometer,
Usually, the lid of the sample chamber of the spectrophotometer is opened and the sample is placed. However, in the case of infrared spectroscopy, there are disadvantages such as the appearance of unnecessary absorption peaks due to absorption by water vapor, carbon dioxide gas, etc. in the atmosphere, making it difficult to obtain appropriate measurement results. In particular, in single beam mode (a mode in which a blank is measured, then a sample is measured, and the ratio is measured), blank side measurement and sample measurement are performed separately, and there is a time difference between them. During this time, the atmosphere changed,
In particular, it was difficult to obtain appropriate measurement results.

In addition, in order to perform measurements without being affected by these atmospheric changes, it is necessary to set up the sample and then sufficiently replace the sample chamber with dry air, _N2, etc. before starting the measurement. It took time.

C. Problems that the invention aims to solve When replacing a sample in a spectrophotometer, the gas atmosphere inside the sample chamber changes, making it difficult to efficiently obtain appropriate measurement results.

The present invention improves these conventional weaknesses and installs a sample exchange device during measurements using a spectrophotometer, thereby reducing changes in the gas atmosphere within the sample chamber and improving measurement efficiency. With the goal.

D. Means for Solving Problems The present invention provides the sample chamber with an opening closing means that is pushed when the sample holder is inserted and removed, thereby making it possible to reduce changes in the gas atmosphere within the sample chamber.

E. Effect The present invention reduces changes in the gas atmosphere inside the sample chamber by installing a sample exchanger equipped with a gas cutoff mechanism that is pushed by the sample in and out of the sample chamber. As a result, measurement efficiency is improved.

F. Example FIG. 1 is a side view of an embodiment of the present invention. 1 is a sample chamber. 1a is the lid of the sample chamber. Reference numeral 4 denotes a sample holder stand, which has a cylindrical shape, has an opening 5 on its lower side surface through which light passes in a direction perpendicular to the axis of the cylinder, and is fixed upright on the bottom surface of the sample chamber 1 with a base plate 8. The upper end of the sample holder stand 4 is designed to pass through the lid 1a of the sample chamber and protrude to the upper surface of the lid when the lid 1a is closed. Gas flow is blocked.

Reference numeral 2 denotes a sample holder, which has a cylindrical shape that fits snugly into the sample holder stand 4, and has a through hole 3 bored in its lower part in a direction perpendicular to the central axis. The sample is formed into a tablet shape and is inserted and held in the through hole 3 provided in the sample holder. When this sample holder 2 is inserted into the sample holder stand 4, the sample holder stand 4 should be inserted so that the center line of the through hole 3 of the sample holder 2 and the center line of the opening 5 of the sample holder stand 4 coincide with each other. A stopper (not shown) is provided. A vertical groove 11 is carved in the side surface of the sample holder 2 parallel to the axial direction, and the sample holder stand 4
A pin 12 that engages with the groove is protruded on the inside of the holder, and when the groove is engaged with the pin and the sample holder 2 is inserted into the sample holder stand 4, the through hole 3 of the sample holder 2 and the sample holder are inserted. The directions of the center lines of the openings 5 of the stand 4 are made to coincide with each other.

A piston-shaped shutter 6 (lower moving bottom) is inserted into the lower part of the sample holder stand 4 and is elastically repelled upward by a spring 7. When the sample holder is inserted into the sample holder stand 4, the shutter 6 is pushed down against the spring by the weight of the sample holder stand, and the sample holder is stopped at a predetermined height by the stopper (not shown). 9 is a light entrance window, 10 is a detector, and 12 is a stop plate for fixing a film or the like.

In FIG. 1, the sample holder 2 is installed, and a light beam from a spectrometer (not shown) enters through the entrance window 9, passes through the opening 5, and passes through the sample in the through hole 3. The light is made incident on the detector 10. Note that the center lines of the opening 5 of the sample holder stand 4 and the through hole 3 of the sample holder 2 are aligned, so that gas can freely flow therethrough. In this state, the gas in the opening 5 and the through hole 3 is prevented from being exchanged with the outside because the sample holder 2 and the sample holder stand 4 are in a compatible state. When the sample holder 2 is pulled up from this state, the shutter 6 is raised together with the sample holder 2 by the force of the spring 7. Then, the side surface of the shutter 6 closes the opening 5 of the sample holder stand 4 to prevent gas exchange between the inside and outside of the sample chamber, thereby preventing the gas atmosphere inside the sample chamber from changing. When the shutter 6 reaches a certain position, the spring is fully extended and the shutter stops at that height, and only the sample holder 2 is pulled out from there (FIG. 2). When the sample holder is removed, gas flows between the sample holder 2 and the shutter 6 through the groove 11. This groove is also used as a guide for correctly installing the through hole 3 when inserting and removing the sample holder. When installing the sample holder 2, conversely, until the sample holder 2 is integrated with the shutter 6, the air inside the sample holder stand 4 is kept in the groove 11.
go out through. Thereafter, the sample holder 2 descends by compressing the spring 7 with its own weight, and is stopped at a fixed position by a stopper (not shown). When the sample holder 2 is integrated with the shutter 6, as it is lowered, the sample holder 2 takes the place of the shutter 6 and isolates the sample chamber 1 from the outside. As described above, it can be seen that the present invention prevents the gas atmosphere in the sample chamber from changing when replacing the sample, and achieves high efficiency in spectrophotometer measurements.

As shown in FIG. 3, the stop plate 12 attached to the through hole 3 is used to hold a sample 13 such as a film by a magnet (not shown) embedded in the side surface of the through hole. used.

G. Effect The present invention uses the method described above, and since the gas in the sample chamber is not released to the outside air when replacing the sample in a conventional spectrophotometer, the atmosphere inside the sample chamber is prevented from changing. Improve the measurement efficiency of spectrophotometers.

[Brief explanation of the drawing]

Fig. 1 is a side view of one embodiment of the present invention;
The drawings are also a side view of one embodiment with the sample holder removed, and FIG. 3 is a three-dimensional view of the sample holder 2.

Claims (1)

[Scope of utility model registration request] The sample holder stand has a cylindrical shape that allows the sample holder to fit and be inserted and removed, and has a through-hole at the bottom that allows the sample to be inserted and fixed, and an opening at the bottom that allows light to pass through in a direction perpendicular to the cylinder axis. , the upper lid of the sample chamber is hermetically penetrated and fixed in the sample chamber, and the lower part of the sample holder stand is provided with a piston-shaped movable bottom that is elastically repelled upward by a spring, so that when the sample holder is inserted into the sample holder stand, the above A sample exchange device for a spectrophotometer, wherein when a movable bottom is pushed down by a sample holder and the sample holder is removed from the holder stand, the movable bottom rises to close an opening at the bottom of the sample holder stand.