Optical path switching acquisition calibration system

Abstract

The utility model relates to a light path switching acquisition calibration system, which comprises a shell, a gold-plated reflecting cup mounted in the middle of the top of the shell, a halogen light source mounted in the middle of the gold-plated reflecting cup, an optical mounting valve mounted in the shell, a mounting column mounted in the optical mounting valve, and a reflecting concave mirror mounted at the top of the mounting column. A reflector is installed at the bottom of the installation column, an optical channel switching assembly is arranged on one side of the reflector in the optical installation valve body, the bottom of the optical channel switching assembly is connected with a rotating shaft, the rotating shaft is connected with a driving motor, an installation base is arranged below the optical installation valve body in the shell, and a concave lens is installed in the installation base. A collimating mirror mounting seat corresponding to the optical mounting valve body is arranged on the side wall of the shell, a collimating mirror is mounted in the collimating mirror mounting seat, and a calibration light source is mounted on the collimating mirror mounting seat. According to the utility model, one optical channel switching assembly is adopted to meet the requirements of sample detection and system calibration, so that the measurement precision and reliability are improved, and the stability of acquired signals is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of optical detection, in particular to an optical path switching acquisition and calibration system. Background Art

[0002] Near-infrared spectroscopy analysis technology can perform rapid and non-destructive analysis on samples. This technology has the advantages of being fast, non-destructive, accurate, and capable of detecting multiple indicators simultaneously, not consuming chemical reagents, and being green and environmentally friendly. Compared with conventional detection methods, it is more suitable for online detection. With the continuous advancement of near-infrared analysis technology and the increasing demand for intelligent factory construction, the trend of using online near-infrared spectroscopy instruments to monitor production links in the field of industrial analysis is becoming more and more obvious.

[0003] When using online near-infrared spectrometers in complex industrial environments, due to the fluctuation of near-infrared light sources and the influence of ambient temperature and humidity, it is necessary to timely perform automatic reference calibration and wavelength calibration on the collected spectra. Considering the adverse effects of the vibration environment, the key optical components inside the instrument must be fixed and reliable to avoid potential analysis deviations caused by movement as much as possible. When performing in-situ online testing in industrial environments, the morphology, particle size, uniformity, purity, impurities, etc. of the materials to be tested are difficult to control. Near-infrared instruments need to collect as much sample information as possible that is representative of the whole area to eliminate random analysis errors caused by sample heterogeneity.

[0004] Most optical path switching parts of existing spectral analysis devices have high control requirements for moving parts, resulting in certain risks in the reliability of detection. Utility Model Content

[0005] The utility model aims to solve the deficiencies of the prior art and provides an optical path switching acquisition and calibration system.

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

[0007] An optical path switching acquisition calibration system comprises a shell, a gold-plated reflective cup is installed in the middle of the top of the shell, a lamp holder is installed in the middle of the gold-plated reflective cup, a halogen light source is installed inside the gold-plated reflective cup on the lamp holder, an optical mounting valve body is installed inside the shell, a mounting column is installed inside the optical mounting valve body, a reflective concave mirror is installed on the top of the mounting column, the reflective concave mirror is located directly below the halogen light source, the bottom of the mounting column is an inclined surface and a reflector is installed on the inclined surface, an optical mounting valve body is provided with an optical channel switching component on one side of the reflector, and the optical channel switching component A rotating shaft is connected to the bottom, which is connected to a driving motor. A mounting seat is provided in the outer shell below the optical mounting valve body, a through hole is provided in the mounting seat just below the mounting column and the reflector, and a concave lens is installed in the through hole, the driving motor is fixed on the mounting seat, a collimating mirror mounting seat is provided on the side wall of the outer shell corresponding to the optical mounting valve body, a collimating mirror is installed in the collimating mirror mounting seat, a through channel is provided on the side of the optical mounting valve body facing the collimating mirror, a calibration light source is installed on the collimating mirror mounting seat, the calibration light source extends into the optical mounting valve body and is located below the optical channel switching component.

[0008] The collimator mirror mounting base is connected with a spectrometer via an optical fiber.

[0009] The optical channel switching component includes a cylinder, a light channel runs through the side wall of the cylinder, the central axis of the light channel rotating toward the reflector and the collimator is arranged corresponding to the central axis of the channel, the central axis of the collimator, and the center of the reflector, the top of the cylinder is beveled toward the side wall with a first bevel, a reference module is arranged on the first bevel, the bottom of the cylinder is beveled toward the side wall with a second bevel, an aluminum reflector is processed on the second bevel.

[0010] A first mounting through hole is provided at the top of the optical mounting valve body corresponding to the cylinder, a second mounting through hole is provided at the top of the optical mounting valve body corresponding to the mounting column, and a third mounting through hole is provided at one side of the optical mounting valve body corresponding to the calibration light source.

[0011] The beneficial effects of the utility model are as follows: the utility model provides an optical path switching acquisition and calibration system, which meets the needs of sample detection and system calibration by adopting an optical channel switching component, and automatically and regularly calibrates the influence of factors such as environmental temperature and humidity, light source energy, and baseline drift, thereby improving measurement accuracy and reliability; at the same time, it avoids the movement of core optical components, eliminates measurement deviations caused by the requirements for movement accuracy to the greatest extent, and improves the stability of the acquisition signal. It is suitable for online and offline near-infrared diffuse reflectance measurements of solids, liquids, suspensions, etc. with different particle sizes, and has wide application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of one direction of the utility model;

[0013] Figure 2It is a structural schematic diagram of another direction of the utility model;

[0014] Figure 3 This is a schematic diagram of the utility model after the housing is omitted;

[0015] Figure 4 It is a schematic diagram of the internal structure of the optical mounting valve body, the mounting seat, and the collimating mirror mounting seat in one direction;

[0016] Figure 5 This is a schematic diagram of the internal structure of the optical mounting valve body, the mounting seat, and the collimating mirror mounting seat from another direction;

[0017] Figure 6 It is a schematic diagram of the structure of the optical mounting valve body;

[0018] Figure 7 A schematic diagram of the bottom structure of the mounting base;

[0019] Figure 8 This is a light principle diagram for collecting sample signals in the utility model;

[0020] Fig. 9 This is a light principle diagram for collecting reference signals in the utility model;

[0021] Fig.10 This is a light principle diagram for the utility model when collecting wavelength calibration signals;

[0022] In the figure: 1-housing; 2-gold-plated reflective cup; 3-lamp holder; 4-halogen light source; 5-optical mounting valve body; 6-mounting column; 7-reflective concave mirror; 8-reflector; 9-optical channel switching component; 10-rotating shaft; 11-driving motor; 12-mounting seat; 13-concave lens; 14-collimating mirror mounting seat; 15-collimating mirror; 16-through channel; 17-calibration light source; 18-optical fiber; 19-spectrometer; 20-bracket; 21-connection plate; 22-sample to be tested;

[0023] 501-first mounting through hole; 502-second mounting through hole; 503-third mounting through hole;

[0024] 901-cylinder; 902-light channel; 903-first inclined plane; 904-second inclined plane;

[0025] 1201-U-shaped groove;

[0026] 2001- bracket tube; 2002- connecting ear plate; 2003- diagonal support ring plate;

[0027] The following is a detailed description of the embodiments of the present invention with reference to the accompanying drawings. DETAILED DESCRIPTION

[0028] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention. The present invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become clearer according to the following description. It should be noted that the drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0029] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a component centered. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a component centered. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a component centered. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0031] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0032] An optical path switching acquisition calibration system, such as Figure 1-Figure 7 As shown, it includes a shell 1, a gold-plated reflective cup 2, a lamp holder 3, a halogen light source 4, an optical mounting valve body 5, a mounting column 6, a reflective concave mirror 7, a reflector 8, an optical channel switching component 9, a rotating shaft 10, a driving motor 11, a mounting seat 12, a concave lens 13, a collimating mirror mounting seat 14, a collimating mirror 15, a through channel 16, a calibration light source 17, a bracket 20 and a connecting plate 21.

[0033] A gold-plated reflector cup 2 is installed in the middle of the top of the shell 1, a lamp holder 3 is installed in the middle of the gold-plated reflector cup 2, a halogen light source 4 is installed on the lamp holder 3 inside the gold-plated reflector cup 2, an optical installation valve body 5 is installed inside the shell 1, a mounting column 6 is installed inside the optical installation valve body 5, a reflective concave mirror 7 is installed on the top of the mounting column 6, the reflective concave mirror 7 is located directly below the halogen light source 4, the bottom of the mounting column 6 is an inclined surface and a reflector 8 is installed on the inclined surface, an optical channel switching component 9 is provided on one side of the reflector 8 in the optical installation valve body 5, a rotating shaft 10 is connected to the bottom of the optical channel switching component 9, and the rotating shaft 10 is connected to A driving motor 11 is provided, and a mounting seat 12 is provided in the outer shell 1 below the optical mounting valve body 5. A through hole is provided in the mounting seat 12 just below the mounting column 6 and the reflector 8, and a concave lens 13 is installed in the through hole. The driving motor 11 is fixed on the mounting seat 12. A collimating lens mounting seat 14 is provided on the side wall of the outer shell 1 corresponding to the optical mounting valve body 5. A collimating lens 15 is installed in the collimating lens mounting seat 14. A through channel 16 is provided on the side of the optical mounting valve body 5 facing the collimating lens 15. A calibration light source 17 is installed on the collimating lens mounting seat 14. The calibration light source 17 extends into the optical mounting valve body 5 and is located below the optical channel switching component 9.

[0034] A connection plate 21 is provided at the bottom of the housing 1 , and a connection hole is provided on the connection plate 21 .

[0035] The collimator mirror mounting seat 14 is connected to a spectrometer 19 via an optical fiber 18 .

[0036] A U-shaped groove 1201 is provided at the bottom of the mounting seat 12 , and the driving motor 11 is installed in the U-shaped groove 1201 .

[0037] The optical channel switching assembly 9 includes a cylinder 901, a light channel 902 passes through the side wall of the cylinder 901, the central axis of the light channel 902 rotating to face the reflector 8 and the collimator 15 is arranged corresponding to the central axis of the channel 16, the central axis of the collimator 15, and the center of the reflector 8, the top of the cylinder 901 is beveled toward the side wall with a first bevel 903, a reference module is provided on the first bevel 903, the bottom of the cylinder 901 is beveled toward the side wall with a second bevel 904, an aluminum reflector is processed on the second bevel 904.

[0038] The reference module may be fixed on the first inclined surface 903 by bonding, or may be disposed on the first inclined surface 903 by coating.

[0039] A first mounting through hole 501 is provided at the top of the optical mounting valve body 5 corresponding to the cylinder 901 , a second mounting through hole 502 is provided at the top of the optical mounting valve body 5 corresponding to the mounting column 6 , and a third mounting through hole 503 is provided at one side of the optical mounting valve body 5 corresponding to the calibration light source 17 .

[0040] A bracket 20 is fixed inside the optical mounting valve body 5, just below the reflector 8 and above the mounting seat 12. The bracket 20 includes a bracket tube 2001, and two connecting ear plates 2002 are provided on the side wall of the bracket tube 2001. The connecting ear plates 2002 are fixed to the mounting seat 12 by bolts. The bracket tube 2001 is provided with an inclined support ring plate 2003, and the inclined support ring plate 2003 is supported on the side of the bottom of the reflector 8 away from the optical channel switching component 9.

[0041] The halogen light source 4 is used to emit near-infrared light.

[0042] The reflective concave mirror 7 is used to diverge the light emitted by the halogen light source 4 .

[0043] The gold-plated reflective cup 2 is used to reflect the light emitted by the halogen light source 4 to the sample 22 to be tested and the reference module.

[0044] The concave lens 13 is used to collect as much light diffusely reflected by the sample 22 as possible into the sample collection channel.

[0045] The reflector 8 is used to change the direction of the light collected in the sample collection channel and enter the collimator 15 .

[0046] The collimator 15 is used to converge the collected divergent light to the receiving end face of the optical fiber 18, so as to ensure the best coupling efficiency between the interface of the optical fiber 18 and the collimator 15.

[0047] The reference module is used to receive the signal directly emitted by the halogen light source 4 , and collect the diffusely reflected light with changed direction into the collimator 15 .

[0048] The calibration light source 17 is used to emit a wavelength calibration standard spectrum line.

[0049] The optical installation valve body 5 is used for installing and fixing the concave lens 13 , the reflector 8 , and the optical channel switching component 9 .

[0050] The driving motor 11 is connected to a control circuit for realizing the change of the detection channels of the halogen light source 4 and the calibration light source 17 under different detection states.

[0051] The optical fiber 18 is used to receive the optical signal transmitted by the signal acquisition channel, and transmit the optical signal to the receiving end of the spectrometer 19 in real time.

[0052] When the utility model is used, the sample 22 to be tested is placed under the near-infrared light source irradiation mechanism, and the reference module, the wavelength calibration part, and the sample detection are integrated into a set of devices. The sample signal, the reference signal, and the wavelength calibration signal are respectively recovered through the built-in optical channel switching component 9, and are converged and transmitted to the spectrometer 19 through the optical fiber 18. The switching of signals between different channels is achieved by driving the motor 11 to control the rotation of the optical channel switching component 9. The collection of the diffuse reflection light signal of the sample 22 to be tested is through a group of lens devices, which can effectively expand the collection area of ​​the diffuse reflection light of the sample 22 to be tested.

[0053] Specifically:

[0054] The light emitted by the halogen light source 4 is diverged by the reflective concave mirror 7 and irradiates the surface of the gold-plated reflective cup 2. After being collimated, the light is irradiated onto the external sample 22 to be tested and the reference module respectively.

[0055] like Figure 8 As shown, when the signal of the sample to be tested 22 is collected in real time, the halogen light source 4 is in the on state, the calibration light source 17 is in the off state, and the driving motor 11 drives the optical channel switching component 9 to switch to the sample signal collection channel, that is, the optical channel 902 is aligned with the reflector 8 and the collimator 15. At this time, a part of the light irradiated on the external sample to be tested 22 will be absorbed by the sample to be tested 22 itself, and the unabsorbed part of the light will be diffusely reflected back, converged by the concave lens 13 and irradiated onto the reflector 8. The direction of the light is changed by the reflector 8, so that the light passes through the optical channel 902 again, reaches the horizontally placed collimator 15, converges to the optical fiber 18, and is finally transmitted to the spectrometer 19. Finally, the spectrometer 19 obtains the near-infrared signal of the sample to be tested 22.

[0056] like Fig. 9 As shown, when the reference signal is automatically and periodically collected, the halogen light source 4 is in the on state, because frequent switching of the halogen light source 4 will affect the stability, so it needs to be always on, and the calibration light source 17 is in the off state, and the driving motor 11 drives the optical channel switching component 9 to switch to the reference signal collection channel, that is, the first inclined surface 903 faces the collimator 15, and the light emitted by the halogen light source 4 is irradiated on the reference module, and a part of it will be absorbed by the reference module itself, and the part of the light that is not absorbed is diffusely reflected back and changes the transmission direction, and is converged to the optical fiber 18 through the horizontally placed collimator 15, and finally transmitted to the spectrometer 19. Finally, the spectrometer 19 obtains the near-infrared signal of the reference module.

[0057] like Fig.10As shown, when the wavelength calibration signal is automatically and periodically collected, the halogen light source 4 is in the on state. Because frequent switching of the halogen light source 4 will affect the stability, it needs to be always on. The calibration light source 17 is in the on state, and the drive motor 11 drives the optical channel switching component 9 to switch to the wavelength calibration signal collection channel, that is, the second bevel 904 faces the collimator 15, and the light emitted by the calibration light source 17 is reflected by the second bevel 904, and then converged to the optical fiber 18 through the horizontally placed collimator 15, and transmitted to the spectrometer 19. Finally, the spectrometer 19 obtains the near-infrared signal of the wavelength calibration module.

[0058] After the instrument is turned on and stabilized for at least one hour, the halogen light source 4 and the calibration light source 17 are turned off, and the optical channel switching component 9 is switched to the reference signal acquisition channel by driving the motor 11 to ensure the signal transmission path of the reference light path. Finally, the spectrometer 19 obtains the dark background near-infrared signal of the reference light path.

[0059] After the instrument is turned on and stabilized for at least one hour, the halogen light source 4 and the calibration light source 17 are turned off, and the optical channel switching component 9 is switched to the sample signal acquisition channel by driving the motor 11 to ensure the sample signal transmission path. Finally, the spectrometer 19 obtains the dark background near-infrared signal of the sample light path.

[0060] According to the standard method of spectral instrument absorbance and wavelength calibration, combined with the near-infrared signal obtained above, the diffuse reflectance near-infrared spectrum of the sample 22 to be tested is finally calculated for subsequent qualitative and quantitative analysis of the sample 22 to be tested.

[0061] The utility model provides an optical path switching acquisition and calibration system, which adopts an optical channel switching component 9 to meet the sample detection and system calibration requirements, automatically and regularly calibrates the influence of factors such as environmental temperature and humidity, light source energy, baseline drift, etc., and improves the measurement accuracy and reliability; at the same time, it avoids the movement of core optical components, eliminates the measurement deviation caused by the requirement for movement accuracy to the greatest extent, improves the stability of the acquisition signal, is suitable for online and offline near-infrared diffuse reflectance measurement of solids, liquids, suspensions, etc. with different particle sizes, and has wide application value.

[0062] The utility model is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the utility model is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the utility model, or are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. An optical path switching acquisition calibration system, characterized in that: The invention comprises a housing (1), a gold-plated reflective cup (2) is installed at the middle position of the top of the housing (1), a lamp holder (3) is installed at the middle position of the gold-plated reflective cup (2), a halogen light source (4) is installed on the lamp holder (3) inside the gold-plated reflective cup (2), an optical installation valve body (5) is installed inside the housing (1), a mounting column (6) is installed inside the optical installation valve body (5), a reflective concave mirror (7) is installed on the top of the mounting column (6), the reflective concave mirror (7) is located directly below the halogen light source (4), the bottom of the mounting column (6) is an inclined surface and a reflective mirror (8) is installed on the inclined surface, an optical channel switching component (9) is provided on one side of the reflective mirror (8) in the optical installation valve body (5), a rotating shaft (10) is connected to the bottom of the optical channel switching component (9), and the rotating shaft (10) ) is connected to a driving motor (11), a mounting seat (12) is provided in the housing (1) below the optical mounting valve body (5), a through hole is provided in the mounting seat (12) directly below the mounting column (6) and the reflector (8), and a concave lens (13) is installed in the through hole, the driving motor (11) is fixed on the mounting seat (12), a collimating lens mounting seat (14) is provided on the side wall of the housing (1) corresponding to the optical mounting valve body (5), a collimating lens (15) is installed in the collimating lens mounting seat (14), a through channel (16) is provided on the side of the optical mounting valve body (5) facing the collimating lens (15), a calibration light source (17) is installed on the collimating lens mounting seat (14), and the calibration light source (17) extends into the optical mounting valve body (5) and is located below the optical channel switching component (9).

2. The optical path switching acquisition calibration system according to claim 1, characterized in that: The collimator mirror mounting seat (14) is connected to a spectrometer (19) via an optical fiber (18).

3. The optical path switching acquisition calibration system according to claim 2, characterized in that: The optical channel switching component (9) comprises a cylinder (901), a side wall of the cylinder (901) having an optical channel (902) passing through it, the central axis of the optical channel (902) rotating toward the reflector (8) and the collimator (15) being arranged correspondingly to the central axis of the passing channel (16), the central axis of the collimator (15), and the center of the reflector (8), the top of the cylinder (901) being obliquely cut toward the side wall to form a first inclined surface (903), the first inclined surface (903) being provided with a reference module, the bottom of the cylinder (901) being obliquely cut toward the side wall to form a second inclined surface (904), and an aluminum reflector being processed on the second inclined surface (904).

4. The optical path switching acquisition calibration system according to claim 3, characterized in that: A first mounting through hole (501) is provided on the top of the optical mounting valve body (5) corresponding to the cylinder (901), a second mounting through hole (502) is provided on the top of the optical mounting valve body (5) corresponding to the mounting column (6), and a third mounting through hole (503) is provided on one side of the optical mounting valve body (5) corresponding to the calibration light source (17).

5. The optical path switching acquisition calibration system according to claim 4, characterized in that: A bracket (20) is fixed inside the optical mounting valve body (5) directly below the reflector (8) and above the mounting seat (12); the bracket (20) comprises a bracket tube (2001); two connecting ear plates (2002) are provided on the side wall of the bracket tube (2001); the connecting ear plates (2002) are fixed to the mounting seat (12) by bolts; an inclined support ring plate (2003) is provided on the bracket tube (2001); the inclined support ring plate (2003) is supported on a side of the bottom of the reflector (8) away from the optical channel switching component (9).

6. The optical path switching acquisition calibration system according to claim 5, characterized in that: A U-shaped groove (1201) is provided at the bottom of the mounting seat (12), and the driving motor (11) is mounted in the U-shaped groove (1201).

7. The optical path switching acquisition and calibration system according to claim 6, characterized in that: A connecting plate (21) is provided at the bottom of the housing (1), and a connecting hole is provided on the connecting plate (21).

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