Self-calibration multi-grating monochromator

Abstract

The utility model discloses a self-calibration multi-grating monochromator. The self-calibration multi-grating monochromator comprises a self-calibration assembly, a grating spectrum system assembly and an optical receiver. The self-calibration assembly comprises a focus lens, a standard light source and a single-face reflector. And the standard light source is used for emitting a light beam with a specified wavelength to the single-sided reflector. And the single-sided reflector is used for reflecting the light beam to the focus lens, and the light beam is focused to the incident end of the grating spectrum system assembly through the focus lens. According to the utility model, an automatic calibration structure composed of the standard light source and the single-sided reflector is arranged at the incident end of the grating spectrum system assembly, so that the monochromator can emit a light beam with a specified wavelength through the standard light source when being used for a long time, and automatic calibration of the grating spectrum system assembly is realized in cooperation with the light receiver. Besides, the single-sided reflector is installed on the sliding rotary table, so that the single-sided reflector gives way when the grating spectrum system assembly is normally used, and interference with external light is avoided when the grating spectrum system assembly is normally used.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of spectrum instrument, concretely relates to a kind of self-calibration multiple grating monochromator. BACKGROUND

[0002] In prior art, grating monochromator is integrated spectrum analysis and measuring instrument subordinate to the research of optical and optoelectronic field, is the instrument that grating is dispersed element, composite light is decomposed into a series of high-purity monochromatic light.

[0003] The Chinese patent with disclosure number "CN213877235U" discloses a photoelectric effect experimental device based on grating spectrum, comprising: a light source assembly for emitting a light beam; an M-type grating spectrum system assembly, which comprises: a slit for transmitting the light beam emitted by the light source assembly, a collimating mirror for receiving the light beam transmitted through the slit and reflecting it, a grating for receiving the light beam reflected by the collimating mirror and reflecting it, and a focusing mirror for receiving the light beam reflected by the grating and reflecting it; a phototube assembly for receiving the light beam reflected by the focusing mirror and generating a photoelectric current; and a linear guide rail, wherein the light source assembly, the M-type grating spectrum system assembly, and the phototube assembly are all slidingly arranged on the linear guide rail.

[0004] In the above-mentioned patent, the strip spectrum light source or continuous spectrum light source is spectrally dispersed by the grating, so that students can obtain a large number of monochromatic light during the experiment. However, the grating monochromator has certain deviations under different environmental temperature and humidity conditions, and mechanical errors may occur in the grating mechanical turntable and structural parts, which may cause inconvenience to the normal use of customers. In order to maintain its accuracy, it needs to be returned to the factory for wavelength calibration regularly. UTILITY MODEL CONTENTS

[0005] In order to make up for the shortcomings of the prior art, the utility model provides a self-calibration multiple grating monochromator to solve the technical problem that the grating monochromator is prone to mechanical errors during long-term use and needs to be returned to the factory for wavelength calibration regularly.

[0006] To achieve the above-mentioned purpose, the specific technical scheme of the utility model is as follows:

[0007] A self-calibration multiple grating monochromator, comprising a self-calibration assembly, a grating spectrum system assembly, and a light receiver. The self-calibration assembly comprises a focusing mirror, a standard light source, and a single mirror. The standard light source is used to emit a light beam of a specified wavelength to the single mirror. The single mirror is used to reflect the light beam onto the focusing mirror and focus it onto the entrance end of the grating spectrum system assembly through the focusing mirror.

[0008] The grating spectrum system assembly is used to spectrally disperse the received light beam of the specified wavelength and output the monochromatic light obtained after spectral dispersion to the light receiver.

[0009] The light receiver is used for receiving the output monochromatic light, determining the wavelength size of the monochromatic light output by the standard light source after the light is split by the grating spectrum system component, and recording the angle value corresponding to the grating rotating platform in the grating spectrum system component.

[0010] Further, the self-calibration component further comprises a front slit and a collimating mirror. The front slit, the collimating mirror and the focusing mirror are sequentially arranged on the incident end of the grating spectrum system component. The front slit is used for limiting the amount of incoming light from the outside. The collimating mirror is used for collimating the light path of the external light. The single mirror is installed between the collimating mirror and the focusing mirror. The bottom of the single mirror is provided with a sliding rotating platform.

[0011] Further, the grating spectrum system component comprises an incident slit, an exit slit, a collimating mirror, a focusing mirror, a first mirror, a second mirror and a grating component. The incident slit is arranged at the position where the light beam of the self-calibration component exits, and is used for limiting the amount of incoming light. The exit slit is used for limiting the amount of light emitted to the light receiver. The first mirror and the second mirror are respectively installed on one side of the incident slit and the exit slit, and are both used for turning the light path. The collimating mirror is used for collimating the light beam emitted from the incident slit. The focusing mirror is used for focusing the light path of the monochromatic light after the light is split by the grating component.

[0012] Further, the grating component comprises a grating rotating platform and a multi-faceted grating. Each facet of the grating is circumferentially arranged on the grating rotating platform around the axis of the grating rotating platform.

[0013] Further, the grating has four facets, which are sequentially divided into a first grating, a second grating, a third grating and a fourth grating.

[0014] Further, the light receiver adopts a PMT photomultiplier tube.

[0015] Further, the standard light source adopts a mercury lamp or a sodium lamp.

[0016] Further, the collimating mirror and the focusing mirror both adopt a concave mirror.

[0017] Further, the first mirror and the second mirror both adopt a concave mirror.

[0018] Compared with the prior art, the utility model has the following advantages:

[0019] The utility model discloses a standard light source and single -sided mirror are arranged on the incident end of grating spectrum system component's automatic calibration structure of constitution, make when monochromator can through standard light source emission specified wavelength's light beam when long -term use, cooperate light receiver and realize the automatic calibration of grating spectrum system component. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is whole structure schematic diagram of the utility model;

[0021] Figure 2 It is structure schematic diagram of self -calibrating subassembly initial state in the utility model.

[0022] Reference signs: 1, standard light source;21, incident slit;22, exit slit;23, front slit;31, first mirror;32, second mirror;33, single -sided mirror;41, first grating;42, second grating;43, third grating;44, fourth grating;51, collimating mirror;52, focusing mirror;6, light receiver;71, collimating mirror;72, focusing mirror. DETAILED DESCRIPTION

[0023] In the description of the utility model, it is understood that the orientation or position relation of the terms "one end", "the other end", "outer side", "upper", "inner side", "horizontal", "coaxial", "central", "end", "length", "outer end" and the like is based on the orientation or position relation shown in the drawing, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore can not be understood as a limitation on the utility model.

[0024] The utility model will be further described below in connection with the drawings.

[0025] As Figure 1 Indicated, a kind of self-calibration multi-grating monochromator, including self-calibration component, grating spectrum system component and light receiver 6.Thereinto, self-calibration component is installed on the incident end of grating spectrum system component, for outputting specified wavelength's light beam to grating spectrum system component.Grating spectrum system component is used to the light of receiving specified wavelength is split and is outputted to light receiver 6 after the single color light obtained by splitting.

[0026] Specifically as Figure 1 And 2As shown, the self-calibration assembly comprises a front slit 23, a collimating mirror 71, a focusing mirror 72, a standard light source 1 and a single mirror 33. The front slit 23, the collimating mirror 71 and the focusing mirror 72 are arranged in sequence on the incident end of the grating spectral system assembly. The front slit 23 is used to limit the amount of external light. The collimating mirror 71 and the focusing mirror 72 are both concave mirrors, wherein the collimating mirror 71 is used to collimate the light path of external light. The focusing mirror 72 focuses the light path of external light and focuses the external light on the incident end of the grating spectral system assembly.

[0027] The standard light source 1 is used to emit a light beam of a specified wavelength to the single mirror 33. The single mirror 33 is installed between the collimating mirror 71 and the focusing mirror 72. In the initial state, the single mirror 33 is located outside the light path between the collimating mirror 71 and the focusing mirror 72 and the mirror surface is parallel to the light path. When the self-calibration operation is performed, the single mirror 33 is driven by the bottom sliding turntable to enter between the collimating mirror 71 and the focusing mirror 72 and forms a 45° angle with the light path, thereby blocking the external light while reflecting the standard light source 1 to the focusing mirror 72, thereby realizing that the light beam of the specified wavelength emitted by the standard light source 1 is guided by the single mirror 33 and enters the grating spectral system assembly.

[0028] In this embodiment, the standard light source 1 adopts a mercury lamp or a sodium lamp.

[0029] The grating spectral system assembly comprises an incident slit 21, an exit slit 22, a collimating mirror 51, a focusing mirror 52, a first mirror 31, a second mirror 32 and a grating assembly. The incident slit 21 is arranged at the position where the light beam of the self-calibration assembly exits and is used to limit the amount of light. The exit slit 22 is used to limit the amount of light emitted to the light receiver 6. The first mirror 31 and the second mirror 32 are respectively installed on one side of the incident slit 21 and the exit slit 22 and are both used to turn the light path. The collimating mirror 51 is used to collimate the light beam emitted from the incident slit 21, and the focusing mirror 52 is used to focus the light path of monochromatic light after the light is split by the grating assembly.

[0030] Specifically, the light beam emitted from the incident slit 21 passes through the first mirror 31, the collimating mirror 51, the grating assembly, the focusing mirror 52 and the second mirror 32 in sequence, and the light path is turned by the second mirror 32 to the exit slit 22 and is emitted.

[0031] In this embodiment, the first mirror 31 and the second mirror 32 are both concave mirrors.

[0032] The grating assembly comprises a grating rotating table and a plurality of grating facets. The grating facets are circumferentially distributed on the grating rotating table around the axis of the grating rotating table. In use, by rotating the grating rotating table, the grating facets are driven to rotate, thereby obtaining monochromatic light of different wavelengths.

[0033] In the embodiment, the grating has four sides, which are sequentially divided into a first grating 41, a second grating 42, a third grating 43 and a fourth grating 44.

[0034] The light receiver is installed on the exit end of the exit slit 22 to receive the output monochromatic light, determine the wavelength of the monochromatic light output by the standard light source 1 after being split by the grating spectral system assembly, and record the angle value corresponding to the grating rotating table in the grating spectral system assembly.

[0035] In the embodiment, the light receiver is a PMT photomultiplier tube.

[0036] In some embodiments, the front slit 23, the collimating mirror 71, the focusing mirror 72, the standard light source 1 and the single mirror 33 are integrated in an external calibrator. The calibrator is clamped on the entrance end of the grating spectral system assembly through a buckle structure. When calibration is needed, the calibrator is fixed on the entrance end of the grating spectral system assembly through clamping to perform calibration. When the calibration is completed, the staff disassembles and separates the calibrator from the grating spectral system assembly to enable normal operation.

[0037] The specific working principle is as follows:

[0038] The single mirror 33 is driven by the sliding rotating table at the bottom to move between the collimating mirror 71 and the focusing mirror 72, and is deflected to form a 45° angle with the light path. The standard light source 1 irradiates a light beam of a specified wavelength on the single mirror.

[0039] The grating rotating table drives each grating to rotate in one direction, and records the light intensity value of each rotating angle of the grating rotating table through the light receiver, and outputs the distribution of the angle (X11) and the light intensity value (Y11). The distribution is compared with the spectral graph of the standard light source (i.e. the wavelength X12 and the light intensity value Y12), the relationship between the standard wavelength and the angle is calculated through an algorithm, a polynomial formula is obtained and saved. Subsequently, the wavelength is input on the interface, and the grating rotating table can rotate to the corresponding angle, and the self-calibration mode is ended.

[0040] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A self-calibrating multi-grating monochromator, characterized in that: Includes self-calibration components, grating spectral system components, and optical receivers (6); The self-calibration component includes a focusing lens (72), a standard light source (1), and a single-sided mirror (33); the standard light source (1) is used to emit a light beam of a specified wavelength to the single-sided mirror (33); the single-sided mirror (33) is used to reflect the light beam onto the focusing lens (72) and focus it onto the incident end of the grating spectral system component through the focusing lens (72); The grating spectral system component is used to split the received beam of a specified wavelength and output the resulting monochromatic light to the optical receiver (6); The light receiver (6) is used to receive the output monochromatic light, determine the wavelength of the monochromatic light output by the standard light source (1) after it is split by the grating spectral system component, and record the angle value corresponding to the grating rotating stage in the grating spectral system component.

2. The self-calibrating multi-grating monochromator according to claim 1, characterized in that: The self-calibration component also includes a front slit (23) and a collimating lens (71); the front slit (23), the collimating lens (71) and the focusing lens (72) are arranged sequentially on the incident end of the grating spectral system component; the front slit (23) is used to limit the amount of external light entering; the collimating lens (71) is used to collimate the optical path of external light; the single-sided mirror (33) is installed between the collimating lens (71) and the focusing lens (72); the bottom of the single-sided mirror (33) is provided with a sliding turntable.

3. The self-calibrating multi-grating monochromator according to claim 1, characterized in that: The grating spectral system components include an entrance slit (21), an exit slit (22), a collimating mirror (51), a focusing mirror (52), a first mirror (31), a second mirror (32), and a grating assembly. The entrance slit (21) is located at the exit position of the beam from the self-calibrating assembly and is used to limit the amount of light entering the system. The first mirror (31) and the collimating mirror (51) are used to reflect the incoming beam onto the grating assembly. The focusing mirror (52) is used to focus the light path of the monochromatic light after it has been split by the grating assembly. The exit slit (22) is used to limit the amount of light emitted toward the light receiver (6).

4. A self-calibrating multi-grating monochromator according to claim 3, characterized in that: The grating assembly includes a grating rotating stage and a multi-faceted grating; each faceted grating is circumferentially distributed on the grating rotating stage around its axis.

5. A self-calibrating multi-grating monochromator according to claim 4, characterized in that: The grating has four sides, which are divided into the first grating (41), the second grating (42), the third grating (43) and the fourth grating (44) in sequence.

6. A self-calibrating multi-grating monochromator according to claim 1, characterized in that: The optical receiver uses a PMT photomultiplier tube.

7. A self-calibrating multi-grating monochromator according to claim 1, characterized in that: The standard light source (1) is a mercury lamp or a sodium lamp.

8. A self-calibrating multi-grating monochromator according to claim 2, characterized in that: Both the collimating lens (71) and the focusing lens (72) are concave lenses.

9. A self-calibrating multigrating monochromator according to claim 3, characterized in that: Both the first reflector (31) and the second reflector (32) are plane reflectors.

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