Optical system of single-beam spectrophotometer

Abstract

The optical system comprises a lamp chamber, a control chamber, a sample chamber and a base, the lamp chamber is arranged on the edge of the base, the control chamber is arranged in front of the lamp chamber, the sample chamber is arranged on the side, away from the lamp chamber, of the base, and an ultraviolet light source, a visible light source and a first reflecting mirror are arranged in the lamp chamber. The first reflecting mirror is arranged on an emergent light path of the ultraviolet light source, a switching mirror is arranged between the ultraviolet light source and the first reflecting mirror and comprises a first mirror surface and a second mirror surface, the ultraviolet light source is positioned on the first mirror surface side, the visible light source is positioned on the second mirror surface side, and an entrance slit and the second reflecting mirror are sequentially arranged on a first reflecting light path of the first reflecting mirror; a collimating mirror is arranged on a second reflection light path of the second reflector, an acute angle is formed between the first reflection light path and the second reflection light path, and a receiver is arranged in the sample chamber and located on an emergent light path of the collimating mirror. The structure arrangement and the circuit wiring of the whole machine are greatly facilitated, and the later maintenance is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of spectral instruments, in particular to an optical system of a single-beam spectrophotometer. Background Art

[0002] Visible spectrophotometer can make qualitative and quantitative analysis of sample substances in the near-ultraviolet and visible spectrum regions, and is one of the commonly used spectral analysis instruments in physical and chemical laboratories. It uses advanced blazed grating monochromator, has the advantages of high wavelength accuracy, good monochromaticity, low stray light, etc., adopts microcomputer measurement system, high τ-A conversion accuracy, and has automatic adjustment of 0% and adjustment of 100%, concentration factor setting, concentration direct reading, and can select serial data printer for data printing. It is widely used in medicine and health, clinical testing, biochemistry, petrochemical, environmental protection, quality control and other departments.

[0003] The basic working principle of the spectrophotometer is that the substances in the solution absorb light under the stimulation of light, and the absorption of light by the substance is selective. Different substances have their own absorption spectra, so when a monochromatic light passes through the solution, its energy will be absorbed and weakened. The degree of light energy weakening has a certain proportional relationship with the concentration of the substance. The spectrophotometer uses this principle to compare the light intensity of the sample being analyzed and the standard sample to analyze the composition of the substance.

[0004] The optical path structure of the traditional spectrophotometer is relatively complex, and the number of reflectors and lenses used is large, which greatly weakens the energy at the receiving end, greatly reduces the anti-interference ability of the instrument, and reduces the resolution. At the same time, it is difficult to balance the energy balance of the instrument in the visible light and ultraviolet regions. The switching process between the deuterium lamp and the tungsten lamp easily causes the instrument to work unstably and the failure rate increases. In addition, the traditional optical path will cause poor filtering effects in certain specific bands during the switching of filters, resulting in inaccurate measurement results. In addition, due to the failure to reasonably layout the lamp room, the space occupancy rate is large, which is not conducive to the overall structure arrangement, circuit wiring and later maintenance. Utility Model Content

[0005] The purpose of the utility model is to provide an optical system of a single-beam spectrophotometer to solve the problems raised in the above background technology.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] An optical system of a single-beam spectrophotometer comprises a lamp house, a control house, a sample house and a base, wherein the lamp house is placed at the edge of the base, the control house is arranged in front of the lamp house, the sample house is placed on the base away from the lamp house, an ultraviolet light source, a visible light source and a first reflector are arranged in the lamp house, wherein the first reflector is placed on the outgoing light path of the ultraviolet light source, a switching mirror is arranged between the ultraviolet light source and the first reflector, the switching mirror comprises a first mirror surface and a second mirror surface, the ultraviolet light source is located on the first mirror surface side, the visible light source is located on the second mirror surface side, an incident slit and a second reflector are arranged in sequence on the first reflected light path of the first reflector, a collimating mirror is arranged on the second reflected light path of the second reflector, the first reflected light path and the second reflected light path form an acute angle, and a receiver is arranged in the sample house, and the receiver is located on the outgoing light path of the collimating mirror.

[0008] Optionally, the lamp chamber shaft is connected to a lamp chamber cover. The deuterium lamp or tungsten lamp can be directly replaced by opening the lamp chamber cover, and no debugging is required when replacing the lamp.

[0009] Optionally, a mirror diameter of the first reflector is larger than a mirror diameter of the second reflector.

[0010] Optionally, a grating is provided between the collimating mirror and the receiver, and the grating is placed in the lamp chamber.

[0011] Optionally, an incident lens, a sample cell and an exit lens are sequentially arranged between the grating and the receiver, wherein the incident lens, the sample cell and the exit lens are placed in the sample chamber.

[0012] Optionally, an exit slit is provided between the grating and the incident lens, and the exit slit is disposed on a side wall of the lamp chamber.

[0013] Optionally, the distance from the ultraviolet light source to the switching mirror is equal to the distance from the visible light source to the switching mirror.

[0014] Compared with the prior art, the utility model has the following advantages:

[0015] 1. Reasonable arrangement of visible light source, ultraviolet light source, reflector and lens is convenient for the overall structure arrangement and circuit wiring, which is conducive to later maintenance.

[0016] 2. Fewer optical components are used, resulting in low energy loss.

[0017] 3. Lenses are used both in front and behind the sample end, with clear imaging and simple optical path debugging.

[0018] 4. The lamp room of the external light path is placed in the corner of the instrument to facilitate maintenance by the staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the optical path structure of the utility model;

[0020] Figure 2 A schematic diagram of the internal structure of the optical system of a prior art spectrophotometer;

[0021] Figure 3 It is a schematic diagram of the internal structure of the optical system of the spectrophotometer of the utility model;

[0022] Figure 4 It is a schematic diagram of the overall structure of the optical system of the spectrophotometer of the utility model;

[0023] Figure 5 The schematic diagram is a schematic diagram of the overall structure of the optical system of the spectrophotometer of the utility model after the lamp chamber cover is opened.

[0024] In the figure, 10, lamp chamber, 11, lamp chamber cover, 20, sample chamber, 21, sample chamber cover, 30, control chamber, 40, base, 1001, ultraviolet light source, 1002, visible light source, 1003, switching mirror, 1004, first reflecting mirror, 1005, incident slit, 1006, second reflecting mirror, 1007, collimating mirror, 1008, grating, 1009, exit slit, 1010, incident lens, 1011, sample cell, 1012, exit lens, 1013, receiver. DETAILED DESCRIPTION

[0025] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the specific implementation method, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0026] like Figure 1-5As shown, an optical system of a single-beam spectrophotometer includes a lamp house 10, a control room 30, a sample room 20 and a base 40, wherein the lamp house 10 is placed at the edge of the base 40, the control room 30 is arranged in front of the lamp house 10, and the sample room 20 is placed on the base 40 away from the lamp house 10. An ultraviolet light source 1001, a visible light source 1002 and a first reflector 1004 are arranged in the lamp house 10, and the first reflector 1004 is placed on the outgoing light path of the ultraviolet light source 1001. 04, a switching mirror 1003 is provided, the switching mirror 1003 includes a first mirror surface and a second mirror surface, the ultraviolet light source 1001 is located on the first mirror surface side, the visible light source 1002 is located on the second mirror surface side, an incident slit 1005 and a second reflector 1006 are provided in sequence on the first reflected light path of the first reflector 1004, a collimator 1007 is provided on the second reflected light path of the second reflector 1006, the first reflected light path and the second reflected light path form an acute angle, and a receiver 1013 is provided on the exit light path of the collimator 1007. The receiver 1013 is placed in the sample chamber 20. A grating 1008, an incident lens 1010, a sample pool 1011 and an exit lens 1012 are provided between the collimator 1007 and the receiver 1013. An exit slit 1009 is also provided between the grating 1008 and the incident lens 1010. The incident lens 1010, the sample pool 1011 and the exit lens 1012 are placed in the sample chamber 20; the grating 1008 is placed in the lamp chamber 10, and the exit slit 1009 is placed on the side wall of the lamp chamber 10. In the present application, the ultraviolet light source 1001 is usually a deuterium lamp, and the visible light source 1002 is usually a tungsten lamp.

[0027] Among them, in order to achieve the situation where a small number of reflectors and lenses are used, it is still possible to ensure that the light energy received by the receiver 1013 is not lost, and it is possible to facilitate the arrangement of other components inside the spectrophotometer. The first reflected light path and the second reflected light path form an acute angle, so that the lamp house 10 can be placed at the edge of the base, that is, the internal corner of the entire spectrophotometer. Preferably, the angle range is 30° to 60°. If the first reflected light path and the second reflected light path form a right angle or an obtuse angle, the distance between the first reflector 1004 and the switching mirror 1003 needs to be increased, that is, the outgoing light path from the deuterium lamp or tungsten lamp to the first reflector 1004 will become longer, so that the lamp house cannot be placed at the edge of the base, otherwise the energy will be attenuated due to the lengthening of the light path. Therefore, in the case of a right angle or an obtuse angle, the lamp house must be placed as follows: Figure 2 The position shown, Figure 2The layout of the spectrophotometer will affect the circuit wiring between the lamp room, control room and sample room. The optical path is the core and basic technical foundation of the spectral instrument. Any slight change may cause a huge fluctuation in the test index parameters of the instrument. Therefore, the optical path of the spectrophotometer must be reasonably designed.

[0028] In order to ensure that the spectrophotometer can maintain accuracy and the light energy received by the receiver 1013 does not suffer loss, the mirror diameter of the first reflector 1004 is greater than the mirror diameter of the second reflector 1006 .

[0029] Furthermore, in order to better arrange the components of the whole machine, the distance from the ultraviolet light source 1001 to the switching mirror 1003 is equal to the distance from the visible light source 1002 to the switching mirror 1003. This design can effectively provide ultraviolet light and visible light when the deuterium lamp and the tungsten lamp are installed in different corners of the lamp house 10, and the ultraviolet light and the visible light have the same optical path distance when reaching the receiver 1013, and the energy is basically the same.

[0030] Optionally, the lamp chamber 10 is axially connected to a lamp chamber cover 11. The deuterium lamp or tungsten lamp can be directly replaced by opening the lamp chamber cover, and no debugging is required when replacing the lamp, which greatly facilitates maintenance personnel to repair the spectrophotometer.

[0031] In normal use, the sample chamber cover 21 of the sample chamber 20 is first opened, the sample pool 1011 is placed in the sample chamber 21, and then the sample chamber cover 21 is closed to start the test. When a fault occurs or the deuterium lamp or tungsten lamp needs to be replaced, the lamp chamber cover 11 is first opened, and then the lens or light source to be replaced is removed and replaced.

[0032] In the description of the present invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "two ends", "left and right", "front and back", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0033] In the present utility model, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the utility model according to the specific circumstances.

[0034] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An optical system of a single-beam spectrophotometer, comprising a lamp chamber (10), a control chamber (30), a sample chamber (20) and a base (40), characterized in that: The lamp chamber (10) is placed at the edge of the base (40), the control chamber (30) is arranged in front of the lamp chamber (10), the sample chamber (20) is placed on the base (40) at a side away from the lamp chamber (10), an ultraviolet light source (1001), a visible light source (1002) and a first reflector (1004) are arranged in the lamp chamber (10), the first reflector (1004) is arranged on the outgoing light path of the ultraviolet light source (1001), a switching mirror (1003) is arranged between the ultraviolet light source (1001) and the first reflector (1004), and the switching mirror (1003) comprises A first mirror surface and a second mirror surface, the ultraviolet light source (1001) is located on the first mirror surface side, the visible light source (1002) is located on the second mirror surface side, an incident slit (1005) and a second reflector (1006) are sequentially arranged on a first reflective light path of the first reflector (1004), a collimator (1007) is arranged on a second reflective light path of the second reflector (1006), an acute angle is formed between the first reflective light path and the second reflective light path, a receiver (1013) is arranged in the sample chamber (20), and the receiver (1013) is located on the exit light path of the collimator (1007).

2. The optical system of the single beam spectrophotometer according to claim 1, characterized in that: The mirror diameter of the first reflector (1004) is greater than the mirror diameter of the second reflector (1006).

3. The optical system of the single beam spectrophotometer according to claim 1, characterized in that: A grating (1008) is provided between the collimating mirror (1007) and the receiver (1013), and the grating (1008) is placed in the lamp chamber (10).

4. The optical system of the single beam spectrophotometer according to claim 3, characterized in that: An incident lens (1010), a sample pool (1011) and an exit lens (1012) are sequentially arranged between the grating (1008) and the receiver (1013); the incident lens (1010), the sample pool (1011) and the exit lens (1012) are placed in the sample chamber (20).

5. The optical system of the single beam spectrophotometer according to claim 4, characterized in that: An exit slit (1009) is provided between the grating (1008) and the incident lens (1010), and the exit slit (1009) is disposed on the side wall of the lamp chamber (10).

6. The optical system of the single beam spectrophotometer according to claim 1, characterized in that: The distance from the ultraviolet light source (1001) to the switching mirror (1003) is equal to the distance from the visible light source (1002) to the switching mirror (1003).

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