Light splitting type reference light path system and ultraviolet detector comprising same

Abstract

The invention discloses a light splitting type reference light path system. A first end of a Y-shaped optical fiber is connected with light source equipment, a second end of the Y-shaped optical fiber is connected with a first detection sensor, and a third end of the Y-shaped optical fiber is connected with a second detection sensor; wherein a flow cell is further arranged between the second detection sensor and the light source equipment, the first end of the flow cell is communicated and connected with the Y-shaped optical fiber, and the second end of the flow cell is communicated and connected with the second detection sensor through a transmission optical fiber. The invention also discloses an ultraviolet detector which adopts the light splitting type reference light path to detect a measured substance and then processes and analyzes corresponding data. According to the scheme, the Y-shaped optical fiber with flexibility and customizability is used for replacing an existing multi-group optical element structure for light splitting, the direction of an optical path can be freely adjusted, an optical path system is simplified, the number of fasteners needed by optical elements is reduced, and cost is effectively saved.

Description

Technical Field

[0001] The invention relates to the detection of substances with strong ultraviolet or visible light absorption ability, in particular to an ultraviolet detector, in particular to a reference optical path system of the ultraviolet detector, and belongs to the technical field of material analysis instruments. Background Art

[0002] The detectors in the spectrometer can generally be divided into different types such as UV / VIS, fluorescence, infrared, etc. Among them, the ultraviolet detector (UV detector) is one of the most widely used detectors. It detects samples by measuring the intensity changes of the substance absorbing ultraviolet, visible light or near-infrared light. Among them, the basic components of the ultraviolet detector include light source, spectroscope, sample cell and photodiode (PD), etc. The light source is a light source device that generates ultraviolet, visible or near-infrared light; the spectroscope disperses the light into light of different wavelengths; the sample cell is a container in which the sample is placed, which contains the substance to be detected. The photodiode is the most important part of the detector, which converts the optical signal into an electrical signal, thereby realizing data processing and analysis.

[0003] However, in common UV detectors with reference light paths, the light source is divided into two beams for reference detection and transmission detection by using a beam splitter. In order to introduce the light beam into the target position, other optical elements (such as sample cells, photoelectric converters and amplifiers, etc.) are required to adjust the direction of the light beam, making the light path structure complex. Not only will the light beam be limited by the original optical element structure size, but it will also lead to more corresponding installation and fixing mechanical parts, which is costly. Therefore, it is necessary to improve and optimize the spectroscopic reference light path system of the UV detector to improve the adaptability of the light path and the performance of the entire instrument. Summary of the invention

[0004] The purpose of the present invention is to solve the above problems and provide a spectroscopic reference optical path system and an ultraviolet detector including the system to solve the problem of complex optical path structure and improve the performance of the instrument.

[0005] The technical solution of the present invention is: a spectroscopic reference optical path system, including a Y-type optical fiber, a first detection sensor, a second detection sensor and a light source device, wherein a three-way connection structure is formed between the Y-type optical fiber and the first detection sensor, the second detection sensor and the light source device, and the characteristics are: the first end of the Y-type optical fiber is connected to the light source device; the second end of the Y-type optical fiber is connected to the first detection sensor; the third end of the Y-type optical fiber is connected to the second detection sensor. A flow cell is also provided between the second detection sensor and the light source device, the first end of the flow cell is connected to the Y-type optical fiber, and the second end of the flow cell is connected to the second detection sensor through a transmission optical fiber.

[0006] Furthermore, in the above-mentioned split-beam reference optical path system, the Y-shaped optical fiber is provided with a first branch optical fiber and a second branch optical fiber, the first branch optical fiber is a transmission optical fiber; the second branch optical fiber is a reference optical fiber.

[0007] Furthermore, in the above-mentioned split-beam reference optical path system, a first collimating lens is provided between the first branch optical fiber and the first detection sensor, and a first filter is provided on a side of the first collimating lens close to the first detection sensor.

[0008] Furthermore, in the above-mentioned spectroscopic reference optical path system, the first detection sensor is a reference detection sensor.

[0009] Furthermore, in the above-mentioned split-beam reference optical path system, the second branch optical fiber and the second detection sensor are provided with a second collimating lens, and a second filter is provided on a side of the second collimating lens close to the second detection sensor.

[0010] Furthermore, in the above-mentioned spectroscopic reference optical path system, the second detection sensor is a transmission detection sensor.

[0011] Furthermore, in the above-mentioned spectroscopic reference optical path system, the first filter and the second filter are both made of thin films with a refractive index of 1.8 to 2.43 and thin films with a refractive index of 1.49 to 1.70 stacked alternately. By designing a multilayer film structure with alternating high and low refractive indices, the reflection loss can be effectively reduced, and the wavelength transmittance of the filter can be further optimized, ensuring that the optical performance reaches a higher precision.

[0012] Furthermore, in the above-mentioned spectroscopic reference optical path system, wherein: the diameter of the mobile phase channel of the circulation cell is greater than 1.5 mm, and the circulation cell adopts a larger mobile phase channel to provide a larger light flux, so that the diffusion of the sample in the circulation cell is smaller, and the peak resolution is improved, which is also conducive to reducing the detection limit and improving the accuracy and sensitivity of the detection; the light source equipment is generally a single-wavelength LED containing ultraviolet light, a single-wavelength laser or a light source with a continuous spectrum, such as a tungsten lamp, a mercury lamp, a deuterium lamp and a xenon lamp.

[0013] The present invention also provides an ultraviolet detector, comprising an ultraviolet detector body, wherein the ultraviolet detector body uses the above-mentioned spectroscopic reference optical path system to detect the measured substance and processes and analyzes the corresponding data.

[0014] Compared with the prior art, after adopting the technical solution of the present invention, the Y-shaped optical fiber is used to replace the existing multiple groups of optical element structures for splitting, which not only simplifies the optical path system, but also reduces the number of fasteners required for the optical elements, effectively saving costs; moreover, the Y-shaped optical fiber structure is flexible and customizable, and the direction of the optical path can be freely adjusted so that it is not restricted by the original optical element structure and size, and the position relative to the circulation pool can also be adjusted and placed according to actual needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention;

[0016] Figure 2 It is a structural schematic diagram of an embodiment of the present invention;

[0017] Figure 3 It is a principle distribution diagram of an embodiment of the present invention;

[0018] Figure 4 This is a schematic structural diagram of the connecting portion of the first detection sensor according to an embodiment of the present invention;

[0019] Figure 5 It is a schematic structural diagram of the connecting part of the second detection sensor according to an embodiment of the present invention.

[0020] The meanings of the reference numerals in the figure are: 1-ultraviolet detector body, 2-Y-type optical fiber, 3-first branch optical fiber, 4-second branch optical fiber, 5-circulation cell, 6-transmission optical fiber, 7-first optical fiber terminal, 8-second optical fiber terminal, 9-third optical fiber terminal, 10-fourth optical fiber terminal, 11-fifth optical fiber terminal, 12-first collimating lens, 13-first optical filter, 14-first detection sensor, 15-second collimating lens, 16-second optical filter, 17-second detection sensor, 18-light source equipment. DETAILED DESCRIPTION

[0021] The technical solution of the present invention is further described below in conjunction with the accompanying drawings to make it easier to understand and grasp. The components involved, such as the ultraviolet detector body 1, the circulation pool 5 and the light source device 18, are all commonly used by ordinary technicians in the field, and there is no special requirement for them in this case. The "first", "second", etc. used in the description process are only for distinction rather than sorting.

[0022] like Figure 1 to Figure 3As shown, the present invention provides a spectroscopic reference optical path system, including a Y-type optical fiber 2, a first detection sensor 14, a second detection sensor 17 and a light source device 18, wherein a three-way connection structure is formed between the Y-type optical fiber 2 and the first detection sensor 14, the second detection sensor 17 and the light source device 18, thereby simplifying the optical path system, reducing the number of original optical elements and the corresponding number of fasteners required for use, and saving a large amount of component costs.

[0023] The technical solution of the present invention is: the first end of the Y-type optical fiber 2 is connected to the light source device 18 through the first optical fiber connector 7; the second end of the Y-type optical fiber 2 is connected to the first detection sensor 14 through the fourth optical fiber connector 10; the third end of the Y-type optical fiber 2 is connected to the second detection sensor 17 through the fifth optical fiber connector 11. A flow cell 5 is also provided between the second detection sensor 17 and the light source device 18, the first end of the flow cell 5 is connected to the Y-type optical fiber 2 through the second optical fiber connector 8, the second end of the flow cell 5 is connected to the first end of the transmission optical fiber 6 through the third optical fiber connector 9, and the second end of the transmission optical fiber 6 is connected to the second detection sensor 17.

[0024] Preferably, in the above system: the Y-type optical fiber 2 is provided with a first branch optical fiber 3 and a second branch optical fiber 4, which can directly divide the light source into two light beams, a reference light beam and a transmission light beam, wherein the first branch optical fiber 3 is a transmission optical fiber; the second branch optical fiber 4 is a reference optical fiber.

[0025] Preferably, if Figure 4 As shown, in the above system: a first collimating lens 12 is provided between the first branch optical fiber 3 and the first detection sensor 14, and a first filter 13 is provided on the side of the first collimating lens 12 close to the first detection sensor 14. After the light beam is focused by the first collimating lens 12, the target wavelength is filtered out by the first filter 13.

[0026] Specifically, the first detection sensor 14 is a reference detection sensor, which has high sensitivity and can be used to detect a reference light beam.

[0027] Preferably, if Figure 5 As shown, in the above system: the second branch optical fiber 4 and the second detection sensor 17 are provided with a second collimating lens 15, and the second collimating lens 15 is provided with a second filter 16 on the side close to the second detection sensor 17. After the light beam is focused by the second collimating lens 15, the target wavelength is filtered out by the second filter 16.

[0028] Specifically, the second detection sensor 17 is a transmission detection sensor, which has high resolution and accuracy, fast response time and anti-electromagnetic interference capability, and can be used to detect the transmission light beam.

[0029] More preferably, the first filter 13 is formed by alternatingly stacking a film with a refractive index of 2.43 and a film with a refractive index of 1.70; the second filter 16 is formed by alternatingly stacking a film with a refractive index of 1.98 and a film with a refractive index of 1.52; the mobile phase channel diameter of the circulation pool 5 is 2 mm; the light source device 18 is a light source LED with a continuous spectrum containing ultraviolet light, and is a tungsten lamp.

[0030] The present invention also provides an ultraviolet detector, including an ultraviolet detector body 1, which uses the aforementioned spectroscopic reference optical path system to detect the measured substance, and processes and analyzes the corresponding data. In actual use, the original ultraviolet detector body 1 uses an optical path structure because its optical path needs to be fixed, so that the overall guiding structure of its optical path must also be fixed and cannot be changed, otherwise it will affect the detection. After using the Y-type optical fiber 2, it has the characteristics of soft performance and free deformation, and can be directly bent within the limited curvature, which is suitable for actual site installation. Therefore, the ultraviolet detector body 1 uses the spectroscopic reference optical path system of the ultraviolet detector to efficiently detect the measured substance and maintain the accuracy of the data processing and analysis structure.

[0031] Among the technical solutions of the present invention, the Y-type optical fiber 2 configured as a three-way type is the technical key of this case. Figure 1 to Figure 3 The focus is on the relevant components involved in the Y-type optical fiber 2 and the two optical fiber lines connected thereto. The Y-type optical fiber can directly divide the light source into two light beams, namely the reference light beam and the transmission light beam, thereby replacing multiple sets of optical element structures for light splitting, thereby comprehensively simplifying the light path structure. For components such as the ultraviolet detector body 1, the flow cell 5, and the light source device 18, ordinary technicians in this field can perform conventional settings according to the existing technology, and this case has no special requirements for their model selection and combined use.

[0032] In this way, the technical solution of the present invention is adopted, and the light source device 18 (i.e., an LED tungsten lamp with a continuous spectrum light source containing ultraviolet light) is used to release the ultraviolet light source. The ultraviolet light source is directly divided into two light beams, a reference light beam and a transmission light beam, through the Y-type optical fiber 2. One beam of light (i.e., the reference light beam) is provided to the first detection sensor 14 (i.e., the reference detection sensor) through the second branch optical fiber 4 (i.e., the reference optical fiber). After the reference light beam is focused by the first collimating lens 12, the target wavelength is filtered out by the first filter 13, and finally irradiated on the first detection sensor 14, so as to monitor the fluctuation of the light source, and then provide the basic light intensity parameters for the transmission end; the other beam of light (i.e., the transmission light beam) is provided to the first detection sensor 14 (i.e., the reference detection sensor) through the first branch optical fiber 3 (i.e., the transmission light beam). The transmitted light beam is provided to the second detection sensor 17 (i.e., the transmission detection sensor) through the first branch optical fiber 3, and enters the circulation pool 5 with a diameter of 2 mm. After the solution in the circulation pool 5 with a diameter of 2 mm absorbs and attenuates the transmitted light beam, the transmitted light beam is focused by the second collimating lens 15, and then the target wavelength is screened out by the second filter 16, and finally irradiated on the second detection sensor 17. According to the basic light intensity parameters provided by the first detection sensor 14 after the detection operation, the second detection sensor 17 is used to obtain the relevant information of the object by measuring the change of the light of the transmitted light beam before and after the object, and calculate the ultraviolet absorbance, which can be used to detect the existence or position of the measured substance or for non-destructive testing of other materials.

[0033] From the above description, it can be found that compared with the prior art, after adopting the technical solution of the present invention, multiple optical elements used for splitting in the prior art are replaced by Y-type optical fibers, and the light source equipment, transmission detection sensor and reference detection sensor are connected through the Y-type optical fiber tee, which not only simplifies the optical path system, but also reduces the number of mechanical parts required for the optical elements, so that non-professionals can also quickly install and operate, effectively saving costs; moreover, the set Y-type optical fiber structure is flexible and customizable, and the direction of the light path can be freely adjusted so that it is not limited by the structure and size of the original optical element, and the position relative to the circulation pool can also be placed according to actual needs.

[0034] The technical scheme, working process and implementation effect of the present invention are described in detail above. It should be noted that what is described is only a typical example of the present invention. In addition, the present invention may also have many other specific implementation methods. Any technical scheme formed by equivalent replacement or equivalent transformation falls within the scope of protection required by the present invention.

Claims

1. A spectroscopic reference optical path system, characterized in that: The invention comprises a Y-shaped optical fiber (2), a first detection sensor (14), a second detection sensor (17) and a light source device (18); a three-way connection structure is formed between the Y-shaped optical fiber (2), the first detection sensor (14), the second detection sensor (17) and the light source device (18); a first end of the Y-shaped optical fiber (2) is connected to the light source device (18), a second end of the Y-shaped optical fiber (2) is connected to the first detection sensor (14), and a third end of the Y-shaped optical fiber (2) is connected to the second detection sensor (17); a circulation pool (5) is also provided between the second detection sensor (17) and the light source device (18); a first end of the circulation pool (5) is connected to the Y-shaped optical fiber (2), and a second end of the circulation pool (5) is connected to the second detection sensor (17) via a transmission optical fiber (6).

2. The spectroscopic reference optical path system according to claim 1, characterized in that: The Y-shaped optical fiber (2) is provided with a first branch optical fiber (3) and a second branch optical fiber (4); the first branch optical fiber (3) is a transmission optical fiber; and the second branch optical fiber (4) is a reference optical fiber.

3. The spectroscopic reference optical path system according to claim 2, characterized in that: A first collimating lens (12) is provided between the first branch optical fiber (3) and the first detection sensor (14), and a first filter (13) is provided on a side of the first collimating lens (12) close to the first detection sensor (14).

4. The spectroscopic reference optical path system according to claim 3, characterized in that: The first detection sensor (14) is a reference detection sensor.

5. The spectroscopic reference optical path system according to claim 2, characterized in that: The second branch optical fiber (4) and the second detection sensor (17) are provided with a second collimating lens (15), and a second filter (16) is provided on a side of the second collimating lens (15) close to the second detection sensor (17).

6. The spectroscopic reference optical path system according to claim 5, characterized in that: The second detection sensor (17) is a transmission detection sensor.

7. The spectroscopic reference optical path system according to claim 3 or 5, characterized in that: The first optical filter (13) and the second optical filter (16) are both formed by alternately stacking thin films with a refractive index of 1.8 to 2.43 and thin films with a refractive index of 1.49 to 1.

70.

8. The spectroscopic reference optical path system according to claim 1, characterized in that: The diameter of the mobile phase channel of the circulation pool (5) is greater than 1.5 mm.

9. The spectroscopic reference optical path system according to claim 1, characterized in that: The light source device (18) is a single-wavelength LED containing ultraviolet light, a single-wavelength laser, or a light source with a continuous spectrum.

10. An ultraviolet detector, comprising an ultraviolet detector body (1), characterized in that: The ultraviolet detector body (1) uses the spectroscopic reference optical path system as described in any one of claims 1 to 9 to detect the measured substance, and processes and analyzes the corresponding data.

Images