Slit base and slit device for ICP spectrometer

Abstract

The utility model discloses a slit seat and a slit device for an ICP spectrometer, the middle part of the front surface of the slit seat is provided with a diversion trench along the vertical direction, and the upper end and the lower end of the diversion trench respectively extend to the edge of the front surface of the slit seat. The flow guide groove is additionally formed in the middle of the front face of the slit base, after the slit base and the blade are assembled, oil dirt or water accumulated between the blade edge and the slit base can be naturally discharged through the flow guide groove in the vertical direction by means of gravity, and on the premise that the performance of the slit device is not reduced, the service life of the slit device is prolonged. And the condition that the slit is filled with oil stain or water to form light path blockage is reduced, so that the reliability and the adaptability of the slit device are obviously improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to ICP spectrometer, concretely relates to a slit seat and slit device for ICP spectrometer. BACKGROUND

[0002] Inductively coupled plasma emission spectrometer (ICP spectrometer for short) is a kind of instrument for element analysis, it is by high-energy excitation using inductively coupled plasma technology, the light wave of specific wavelength is emitted by element, then the light wave of emission is analyzed, to accurately determine the type and content of element in sample.The data acquisition process of ICP is realized through the light signal (wavelength indicates element, light intensity indicates content) carrying element information, two processes of transmission and photoelectric conversion.

[0003] Due to the reason of being in the most front end of information acquisition position, the collection and transmission link of light signal, for the measurement accuracy and stability of ICP spectrometer, have very key effect.Slit is the key component of light signal transmission link, and the basic requirement for its performance is to ensure the minimum attenuation and distortion of light signal in transmission process. Figure 1 As shown in the monochromator of ICP spectrometer, the incident light through the lens barrel is first irradiated to the concave mirror inside the monochromator through the entrance slit, then is reflected to the grating through the mirror, the single wavelength light after diffraction and light splitting is irradiated to another concave mirror through the exit slit, and then is irradiated to the cathode of photomultiplier tube through the exit slit, and finally completes photoelectric conversion.

[0004] As shown in the monochromator of ICP spectrometer, the incident light through the lens barrel is first irradiated to the concave mirror inside the monochromator through the entrance slit, then is reflected to the grating through the mirror, the single wavelength light after diffraction and light splitting is irradiated to another concave mirror through the exit slit, and then is irradiated to the cathode of photomultiplier tube through the exit slit, and finally completes photoelectric conversion. Figure 2-3 As shown in the monochromator of ICP spectrometer, the incident light through the lens barrel is first irradiated to the concave mirror inside the monochromator through the entrance slit, then is reflected to the grating through the mirror, the single wavelength light after diffraction and light splitting is irradiated to another concave mirror through the exit slit, and then is irradiated to the cathode of photomultiplier tube through the exit slit, and finally completes photoelectric conversion.

[0005] Because the slit gap formed between the two knife edges 101 after assembly is generally only (20-25) μm, there is no gap between the mounting surface of the knife edge and the slit seat, so when used in a relatively humid environment, only a small amount of moisture or oil accumulation will fill the slit, causing the light path to be blocked, affecting the normal operation of the ICP spectrometer, and the user himself to remove the slit blockage is easy to damage the normal position of the slit, the position accuracy of the slit is very high, and special instruments are needed to calibrate. UTILITY MODEL CONTENTS

[0006] In view of the defects of the prior art, the utility model aims at providing a slit seat and slit device for ICP spectrometer.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] The utility model provides a slit seat for an ICP spectrometer. A guide groove is provided in the middle of the front side of the slit seat in a vertical direction. The upper end and the lower end of the guide groove respectively extend to the edge of the front side of the slit seat.

[0009] Furthermore, the transverse width of the guide groove is (1±0.15) mm, and the longitudinal depth is (0.7±0.1) mm.

[0010] The utility model also provides a slit device for an ICP spectrometer, comprising at least two blades and the above-mentioned slit seat, wherein the two blades are respectively fixed on both sides of the front side of the slit seat, and a slit gap is formed between the two blades.

[0011] The beneficial effect of the utility model is that, by adding a guide groove in the middle of the front side of the slit seat, after the slit seat and the blade are assembled, the oil or water accumulated between the blade edge and the slit seat can be naturally discharged in the vertical direction by gravity through the guide groove. Under the premise of not reducing the performance of the slit device, the situation in which the slit is filled with oil or water and thus the light path is blocked is reduced, thereby significantly improving the reliability and adaptability of the slit device. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 Schematic diagram of the optical path structure of the monochromator of the ICP spectrometer;

[0013] Figure 2 Schematic diagram of the structure of an existing slit seat, wherein (a) is a side cross-sectional view of the slit seat, (b) is a front schematic diagram of the slit seat, and (c) is an AA cross-sectional view of (a);

[0014] Figure 3 Schematic diagram of the structure of existing blades, wherein (a) is a front view of two blades, and (b) is a top view of (a);

[0015] Figure 4 Schematic diagram of the structure of the slit seat in Example 1 of the present invention, wherein (a) is a side cross-sectional view of the slit seat, (b) is a front schematic diagram of the slit seat, and (c) is an AA cross-sectional view of (a). DETAILED DESCRIPTION

[0016] The present invention will be further described below in conjunction with the accompanying drawings. It should be noted that this embodiment is based on the technical solution and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to this embodiment.

[0017] Example 1

[0018] This embodiment provides a slit holder for an ICP spectrometer, such as Figure 4 As shown, a guide groove 2 is provided in the middle of the front side of the slit seat 1 along the vertical direction, and the upper end and the lower end of the guide groove 2 extend to the edge of the front side of the slit seat 1 respectively.

[0019] By arranging a guide groove 2 in the vertical direction in the middle of the front side of the slit seat 1, after the slit seat and the blade are assembled, the oil or moisture accumulated between the blade edge and the slit seat can be naturally discharged by gravity through the guide groove 2 in the vertical direction, thereby reducing the blockage of the slit.

[0020] Furthermore, through experimental analysis, better results can be achieved when the transverse width of the guide groove 2 is (1±0.15) mm and the longitudinal depth is (0.7±0.1) mm.

[0021] Example 2

[0022] This embodiment provides a slit device for an ICP spectrometer, comprising two blades and the slit base 1 as shown in Example 1. The two blades are respectively fixed to two sides of the front side of the slit base, and a slit gap is formed between the two blades.

[0023] Those skilled in the art can make various corresponding changes and modifications based on the above technical solutions and concepts, and all of these changes and modifications should be included in the scope of protection of the claims of this utility model.

Claims

1. A slit holder for an ICP spectrometer, characterized in that: A guide groove is provided in the middle of the front surface of the slit seat along the vertical direction, and the upper end and the lower end of the guide groove extend to the edge of the front surface of the slit seat respectively.

2. The slit seat according to claim 1, characterized in that The transverse width of the guide groove is (1±0.15) mm, and the longitudinal depth is (0.7±0.1) mm.

3. A slit device for an ICP spectrometer, characterized in that: It comprises at least two blades and the slit seat according to any one of claims 1-2, wherein the two blades are respectively fixed on both sides of the front side of the slit seat, and a slit gap is formed between the two blades.

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