JPS5968651A - Instrument for spectrochemical analysis - Google Patents

Abstract

PURPOSE:To perform a simultaneous analysis of multi-element without a movable part by providing plural lamps centering around an optical axis and concave, convex mirrors, and providing a hole through which the light from the convex mirror is passed at the concave mirror. CONSTITUTION:Plural lamps 21 are fixed surrounding an optical axis as a center. Luminous flux 24 from the lamps 21 is received and reflected by a parabolic mirror 22, then reflected again by the convex mirror 23 and is passed through a center hole 22A of the mirror 22 to advance on the optical axis. Here, since the lamps 21 for different kind elements are positioned where the optical axis is on the axis of revolution symmetry, the light advancing on the optical axis become the synthesized light 25 of all lamps 21. Since the light 25 is emitted to the outer part from the hole 22A at the center of the mirror 22, each light source can be regarded as one light source unit and is equivalent to the lamp radiating simultaneously atomic spectra of plural elements.

Description

DETAILED DESCRIPTION OF THE INVENTION [First Field of the Invention] The present invention relates to an apparatus for observing atomic spectra and performing spectroscopic analysis, such as an atomic absorption spectrophotometer.

[Prior art]

For example, in an atomic absorption spectrometer, a dedicated light source is required for each element to be measured. A cathode lamp is required. Furthermore, when measuring At, a hollow cathode lamp with an A4 cathode is required.

Conventionally, in an atomic absorption spectrophotometer, measurements have been made by changing the lamps of about 40 types of elements to be phase-separated each time.

When the lamp was replaced, it took 15 to 40 minutes to stabilize, and the optical axis of each lamp had to be aligned. Therefore, recently, turret type lamp holders have come into use. As shown in FIG. 1, this is attached to the outer periphery of a turret lO having several tubes 1 containing hollow cathodes 6 and a shaft 9, and the optical axes of each lamp 1 are aligned in advance. It is a good idea to go there and pre-light the trench. According to this, the spectral line of the target element can be obtained by rotating the turret 10 and setting the lamp 1 of the target element at the optical axis position. However, this method also has the following drawbacks.

1) It is not possible to see each spectral line of multiple elements at the same time. Therefore, simultaneous analysis of multiple elements is not possible.

2) When multiple elements are subjected to secondary analysis using the seek/shall method, the turret must be rotated to select a lamp for each element.

3) Impact is applied to the lamp when the turret rotates.

[Purpose of the invention]

The present invention solves the drawbacks of the prior art, and simultaneously guides light from several rungs to a spectrometer without moving parts.
The present invention provides a spectroscopic analyzer that enables simultaneous analysis of multiple elements.

[Summary of the invention]

In order to achieve the above object, the present invention includes a plurality of lamps arranged around the optical axis, a concave mirror that reflects the light from the lamps, and a convex mirror that reflects the light from the concave mirror. The concave mirror is provided with a hole at its center through which light from the convex mirror passes.

[Embodiments of the invention]

FIG. 2 is a diagram showing an embodiment of the spectroscopic analyzer according to the present invention. The plurality of lamps 21 are fixed around the optical axis as the middle ru. Luminous flux 2 from each lamp 21
4 is condensed and reflected by the parabolic mirror 22, reflected again by the convex mirror 23, passes through the hole 22A at the center of the parabolic mirror, and travels on the optical axis. Since the plurality of lamps for different elements are arranged at positions where the optical axis is a rotationally symmetrical axis, the light traveling on the optical axis becomes the combined light of all the lamps. The combined light is emitted to the outside from a hole 22A made in the center of the parabolic mirror.

That is, each light source shown in the figure can be considered as one light source unit, and is equivalent to a lamp that simultaneously emits the atomic spectra of a plurality of elements.

Figure 3 shows a more detailed trace of the rays. The light source 31 and the light source 32 correspond to a light emitting point (the center of the hollow cathode). The light beams 33 and 34 from each party #31 and 32 are reflected by a parabolic mirror 37 and then proceed toward a common imaging point (tiger fish 35). However, a convex mirror 36 is inserted in the middle The image reflected by this convex mirror 36 forms an image at the center of a hole 38 provided at the center of the parabolic mirror. After that, the convex lens 39 focuses the image on the focal point 30,
can be imaged. Different light sources in Figure 3 31°32
It can be seen that even after being combined, the light beams emitted from the light beams either proceed along slightly different paths along the optical axis, or the light beams completely coincide with each other at each imaging point.

ic and Figure 3 shows the luminous flux for light sources 31 and 32.If a larger number of light sources were arranged around the axis of the combined luminous flux, the image forming point would also be perfectly coincident. It is possible to obtain a composite luminous flux. In the actual device, the combined light is sent to the atomization section and the entrance slit.

An image is formed on the exit slit.

Next, in the fourth section, a schematic configuration diagram of an atomic absorption spectrophotometer capable of simultaneous multi-element analysis is shown.

The light source shown in FIG. 2 is used.

The composite image C bundle 25 is imaged at the center of the frame 41.

The flame 41 is usually generated by a burner 42Vc that burns acetylene with air, and a sample 43 atomized by an obbulizer is introduced. The composite beam that has passed through the frame 41 is again imaged on the second side of the entrance slit 44. Next, the light is diffracted by the concave diffraction grating 45 and focused on the output slit 46, and then enters the detector 47.The plurality of output slits 46 are placed at the positions of the diffracted light corresponding to the wavelength of each element.

Each detector forming the JFII polychromator can detect atomic absorption signals for each element and perform quantitative analysis for each element.

Figure 4 shows a multi-element simultaneous analysis device using a polychromator sound, but if the above synthetic CC light sound is used in an atomic absorption spectrometer using a conventional monochromator, there is no need to replace the lamp for each element. Sequential analysis of eye movements is possible.

In this embodiment, the present invention is applied to the atomic absorption spectroscopy C-pro change as described above, but it goes without saying that it can also be applied to other atomic spectrum analysis methods such as atomic fluorescence.

〔Effect of the invention〕

As is clear from the above description, the spectrometer according to the present invention allows simultaneous analysis of multiple elements by simultaneously asking the spectrometer for the elements from a plurality of 11 lamps without any moving parts. I can do it.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of the light source section of a conventional spectroscopic analyzer.
Fig. 2 shows an example of the optical depth section of the spectroscopic analyzer according to the present invention. Fig. 3 shows the reason why the object of the present invention can be achieved. Fig. 4 shows a multi-element analyzer to which the present invention is applied. It is a figure which shows an example of u4 analysis atomic absorption light change needle. 21... Hollow cupdra pufferfish, 22... Parabolic mirror, 23... Convex mirror, 24... Luminous flux, 25... Combined light. Rabbit 1 Figure 1 Yu7 Father

Claims (1)

[Claims] 1. It is equipped with a plurality of lamps arranged around the optical axis, a concave mirror that reflects the source from the lamps, and a convex mirror that reflects the source from the concave mirror, and the concave mirror has the source from the convex mirror at its center. A spectroscopic analysis device characterized by being provided with a hole through which a.