JPS581742B2 - Bunko Koudokei - Google Patents

Description

[Detailed description of the invention] The present invention relates to a spectrophotometer having an open sample chamber.

Conventionally, when measuring the absorption of a sample with a spectrophotometer in the ultraviolet and visible ranges, not just a double monochrome spectrophotometer,
The sample is shielded from external light.

The reason for isolating the sample from external light in this way is to keep the sample chamber open so that when external light hits the sample, the reflected external light enters the photodetector and does not distort the measurement results. It is.

In the present invention, the sample chamber is made open to facilitate handling, and a light blocking plate is attached to the spectrometer that receives the light passing through the sample chamber, thereby making it possible to more effectively block external light. The purpose is to provide a spectrophotometer.

Next, preferred embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows an example in which the present invention is implemented in a double monochrome spectrometer. In the figure, 1 and 2 are first and second spectrometers, and a sample chamber 3 is located between them.

This sample chamber 3 is an open type, and includes a sample 4 and a control sample 5.
is installed externally.

As shown in FIG. 1, the first spectroscope 1 includes a monochromator 7 with a slit 10, a pair of spherical mirrors 11, and an exit window 15.
, a light source 17, and an appropriate number of reflecting mirrors, and the second spectrometer 2 includes a monochromator 6 with an entrance slit 13, a photodetector 8, a spherical mirror 12, and an appropriate number of reflecting mirrors. This light blocking plate 14 includes a light blocking plate 14 for blocking light. In order to most effectively block external light, the exit window 15 of the first spectrometer is connected to the spherical mirror 12 of the second spectrometer.
The light blocking plate 1 is installed at a position where the image is formed by
The size of the window hole 4 is smaller than the size of the image of the exit window 15 and larger than the cross-sectional area of the light beam of the signal light.

As shown in the figure, the light blocking plate 14 is usually a flat plate bent at an appropriate angle with window holes formed on each side, one side perpendicular to the light beam passing through the test needle 4 and the other side. It is mounted at right angles to the light beam passing through the control sample 5.

With this configuration, the light from the light source 17 has a wavelength limited by the monochromator I of the first spectroscope 1 and is emitted from the slit 10, and the light is transmitted to the spherical mirror 11.
The image of the slit 10 is formed on the samples 4 and 5 by the spherical mirror 12.
The image is again imaged onto the entrance slit 13 through the window hole 4.

Therefore, the external light that enters from the part off the optical axis of the sample is removed by the entrance slit 13, but in reality, if there is no light beam or cutting plate 14, some of the external light that passes through the entrance window 9 will be removed. passes through the entrance slit 13.

In the spectrometer according to the present invention, in order to remove such external light, a light blocking plate 14 is provided in the second spectrometer 2, and its mounting position is such that the exit window 15 is located on the spherical mirror of the second spectrometer. 12, external light entering through the entrance window 9 cannot pass through the window hole of the light blocking plate 14 and is removed there.

So far, we have shown a double monochrome spectrometer, but
The present invention can also be implemented in a single monochrome spectrometer, as shown in FIG.

That is, as shown in FIG. 2, there is a sample chamber 3 between the light source section 16 and the spectroscope 2, and the light source 17 is configured to form an image at the position of the sample using a spherical mirror 18.

In this case as well, by installing the light blocking plate 14 at a position where the exit window 15 of the light source section 16 forms an image with the spherical mirror 12, the sample chamber 3 can be made open and the sample can be exposed to the outside.

In this way, in the spectrophotometer according to the present invention, by providing a light blocking plate, it is possible to block external light more effectively, and the sample chamber can be made into an open type, making it easier to handle. There are advantages.

[Brief explanation of the drawing]

Fig. 1 shows an optical system of an embodiment of a double monochrome spectrophotometer embodying the present invention, and Fig. 2 shows an optical system of an embodiment of a single monochrome spectrophotometer embodying the invention. . Explanation of symbols, 1... Spectrometer, 2... Spectrometer, 3... Sample chamber, 12... Spherical bell, 14...・Light-blocking plate.

Claims (1)

[Claims] 1. In a spectrophotometer that includes a sample chamber and at least one spectrometer and is used for measurements in the ultraviolet and visible ranges, in order to make the sample chamber open, a light shielding plate is installed so that the exit window to the sample chamber is connected to the sample chamber. It is installed at a position where an image is formed by a spherical mirror in a spectrometer that receives light from a chamber, and the light blocking plate has a hole on the optical path that is smaller than the size of the image and larger than the cross-sectional area of the light beam. spectrophotometer.