Optical fiber probe
By designing a fiber optic probe with a single optical path structure, the problem of measurement inaccuracy caused by bubble retention was solved, achieving higher measurement accuracy and reliability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHINA INSTITUTE OF ATOMIC ENERGY
- Filing Date
- 2026-01-04
- Publication Date
- 2026-05-08
AI Technical Summary
Existing immersion fiber optic probes are prone to air bubble retention in the measurement of samples with short optical paths and high viscosity, which leads to abnormal optical signals and affects measurement accuracy.
A fiber optic probe was designed, which uses a reflective component and a probe window component to form a single optical path structure. The optical signal penetrates the sample only once at the liquid inlet and propagates through a third optical path in the reflective component, avoiding air bubble retention and ensuring that the optical signal is separated from the sample.
This effectively prevents air bubbles from accumulating at the liquid outlet, improves the accuracy of measurement results, reduces abnormal signals caused by light signals passing through air bubbles, and enhances the reliability of measurements.
Smart Images
Figure CN121994719A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of spectral measurement technology, and in particular to an optical fiber probe. Background Technology
[0002] Spectroscopic measurement technology is a crucial analytical technique in scientific research and industrial applications. Immersion fiber optic probes, which can directly contact samples and acquire sample spectral data without sampling, have become the core component of online and in-situ analysis equipment and are increasingly widely used in various fields.
[0003] In related technologies, immersion fiber optic probes employ a double optical path design, with the physical gap of the liquid passage being half the optical path, allowing the optical signal to penetrate the sample twice. However, in measurements of short optical paths and samples with high viscosity, air bubbles in the sample are easily trapped in the narrow liquid passage. The optical signal passing through the air bubbles causes abnormal spectral signals, leading to inaccurate measurement results. Summary of the Invention
[0004] In view of this, the main objective of the embodiments of this application is to provide an optical fiber probe that can improve measurement accuracy.
[0005] To achieve the above objectives, the technical solution of this application embodiment is implemented as follows: This application provides an embodiment of an optical fiber probe, including: The probe body has a first incident optical path and an outgoing optical path; An optical path component includes a reflective component and a probe window component. The reflective component has an incident area and an exit area, and is spaced apart from the first incident optical path to form a gap space. The probe window component includes a first window and a second window. The first window is located in the gap space near the reflective component, and the second window is located in the gap space near the probe body. The first window and the second window are spaced apart to form a liquid passage opening communicating with the outside. A first optical path is formed between the first incident optical path and the incident area, passing through the second window, the liquid passage opening, and the first window. The exit area is sealed with the exit optical path, and a second optical path is formed. The light propagation directions in the first optical path and the second optical path are opposite. A third optical path is formed within the reflective component from the incident area to the exit area.
[0006] In one embodiment, the reflective component includes a beam splitter located on the third optical path. The third optical path includes a second incident optical path, a reflected optical path, and a transmitted optical path. The beam splitter is located at the intersection of the second incident optical path, the reflected optical path, and the transmitted optical path. The second incident optical path is formed between the incident area and the beam splitter, and the reflected optical path and the transmitted optical path are formed between the beam splitter and the exit area.
[0007] In one embodiment, the second optical path includes a first beam splitter and a second beam splitter, wherein the first beam splitter and the second beam splitter are separated, the first beam splitter is connected to the reflected optical path, and the second beam splitter is connected to the transmitted optical path.
[0008] In one embodiment, the fiber optic probe includes a first lens and a second lens, the first lens being located on the reflected light path and the second lens being located on the transmitted light path, so that the light passing through the first lens and the second lens propagates in the same direction.
[0009] In one embodiment, the reflective component includes at least one optical reflective surface, the second incident light path includes a first sub-light path and a second sub-light path, the first sub-light path is formed between the incident area and the optical reflective surface, and the second sub-light path is formed between the optical reflective surface and the beam splitter, wherein the light propagation directions in the first sub-light path and the second sub-light path are opposite.
[0010] In one embodiment, at least a portion of the first sub-optical path has a light propagation direction opposite to that of at least a portion of the reflected optical path; and / or, At least a portion of the first sub-optical path has a light propagation direction opposite to that of at least a portion of the transmitted optical path.
[0011] In one embodiment, the reflective assembly includes a first housing, the first housing including a window platform having the incident area, a first window slat disposed on the window platform, and at least a portion of the first window slat protruding from the window platform toward one side of the second window slat to collectively form a stepped structure.
[0012] In one embodiment, the optical path component is detachably connected to the probe body.
[0013] In one embodiment, the fiber optic probe includes a light source fiber optic line and a detection spectrum fiber optic line. The light source fiber optic line is connected to the first incident optical path. The detection spectrum fiber optic line includes a detection fiber bundle, a first detection fiber bundle, and a second detection fiber bundle. One end of the detection fiber bundle is connected to the outgoing optical path, and the other end is connected to the first detection fiber bundle and the second detection fiber bundle, respectively.
[0014] In one embodiment, the detection fiber bundle includes a plurality of first optical fibers, and each of the first optical fibers is arranged in an array on a cross-section perpendicular to the first optical fibers; and / or, The first detection fiber bundle includes multiple second optical fibers, and on a cross-section perpendicular to the second optical fibers, each second optical fiber is arranged in a column; and / or, The second detection fiber bundle includes multiple third fibers, which are arranged in columns on a cross section perpendicular to the third fibers.
[0015] This application provides an optical fiber probe, which includes a probe body and an optical path component. The optical path component includes a reflective component and a probe window component. The reflective component has an incident area and an exit area, and is spaced apart from a first incident optical path to form a gap space. The probe window component includes a first window and a second window. The first window is located within the gap space near the reflective component, and the second window is located within the gap space near the probe body. The first and second windows form a liquid passage opening that communicates with the outside. A first optical path is formed between the first incident optical path and the incident area, passing through the second window, the liquid passage opening, and the first window. A second optical path is formed between the exit area and the exit optical path, and the light propagation directions in the first and second optical paths are opposite. A third optical path is formed within the reflective component from the incident area to the exit area. That is, the optical signal enters the reflective component from the first optical path and propagates along the third optical path to the second optical path. Furthermore, the optical signal in the first optical path only penetrates the sample once at the liquid passage opening, while the second optical path is sealed and separated from the sample. Therefore, the optical signal does not penetrate the sample twice in the first optical path, and the physical gap of the fiber optic probe's liquid inlet can be as close as possible to the optical path. In the same optical path measurement, the fiber optic probe has a larger physical gap, making it easier for air bubbles in the sample to flow out of the liquid inlet. This reduces the risk of air bubbles getting stuck at the liquid inlet, effectively preventing the optical signal from passing through the air bubbles and causing abnormal spectral signals, resulting in more accurate measurement results. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the structure of an optical fiber probe according to an embodiment of this application; Figure 2 for Figure 1 Schematic diagram of the intermediate optical path component; Figure 3 for Figure 1 Schematic diagram of the optical path design of the intermediate optical path component and the probe body; Figure 4 for Figure 1 Schematic diagram of the AA section of the intermediate optical path component; Figure 5 for Figure 1 A schematic diagram of the structure of the optical fiber for detecting the spectrum; Figure 6 for Figure 5 A schematic diagram of the BB cross-section of the detection fiber bundle; Figure 7 for Figure 5 A schematic diagram of the CC cross-section of the first detection fiber bundle in the middle; Figure 8 for Figure 5 A schematic diagram of the CC cross-section of the second detection fiber bundle; Figure 9 Ni is an embodiment of this application 2+ UV-Vis absorption spectrum of the standard solution; Figure 10 This is a near-infrared absorption spectrum of an HNO3 solution according to an embodiment of this application; Figure 11 This is the ultraviolet-visible to near-infrared absorption spectrum of a mixed sample solution according to an embodiment of this application.
[0017] Explanation of reference numerals in the attached figures 10. Probe body; 10a. First incident optical path; 10b. Outgoing optical path; 11. Third lens; 12. Light source fiber optic interface; 13. Detection spectrum fiber optic interface; 20. Optical path component; 21. Reflection assembly; 21a. Incident area; 21b. Outgoing area; 21c. Third optical path; 211. Optical reflecting surface; 212. Window platform; 22. Probe window assembly; 22a. Liquid outlet; 22b. First optical path; 22c. Second optical path; 221. First window; 222. Second window; 223. Sealing cover; 223a. First beam splitter; 223b. Second beam splitter; 30. Light source fiber optic line; 40. Detection spectrum fiber optic line; 41. Detection fiber bundle; 411. First fiber; 42. First detection fiber bundle; 421. Second fiber; 43. Second detection fiber bundle; 431. Third fiber. Detailed Implementation
[0018] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings. The described embodiments should not be regarded as limitations on this application. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0019] In the description of the embodiments of this application, the technical terms "first", "second", "third", etc. are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.
[0020] Unless otherwise defined, all technical and scientific terms used in the embodiments of this application have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in the embodiments of this application is for the purpose of describing the embodiments of this application only and is not intended to limit this application.
[0021] One embodiment of this application provides an optical fiber probe; please refer to [link / reference]. Figures 1 to 3 The fiber optic probe includes a probe body 10 and an optical path component 20.
[0022] The probe body 10 has a first incident optical path 10a and an outgoing optical path 10b.
[0023] The optical path component 20 includes a reflective component 21 and a probe window component 22. The reflective component 21 has an incident area 21a and an exit area 21b. The reflective component 21 is spaced apart from the first incident optical path to form an intervening space. The probe window component 22 includes a first window 221 and a second window 222. The first window 221 is located in the intervening space on the side closer to the reflective component 21, and the second window 222 is located in the intervening space on the side closer to the probe body 10. The first window 221 and the second window 222 form a liquid passage 22a that communicates with the outside. A first optical path 22b is formed between the first incident optical path and the incident area 21a, passing through the second window 222, the liquid passage 22a, and the first window 221. The exit area 21b is sealed with the exit optical path 10b and forms a second optical path 22c. The propagation directions of the light in the first optical path 22b and the second optical path 22c are opposite. A third optical path 21c is formed in the reflective component 21 from the incident area to the exit area.
[0024] Specifically, there are no restrictions on the type of fiber optic probe. For example, a fiber optic probe can be a single-path immersion fiber optic probe. Another example is a split-type fiber optic probe.
[0025] The first incident light path 10a and the outgoing light path 10b of the probe body 10 serve as channels for the propagation of light signals. The optical path component 20 includes a reflection component 21 and a probe window component 22. Thus, the light signal reaches the optical path component 20 through the first incident light path 10a, penetrates the sample at the probe window component 22, and is reflected by the reflection component 21 into the outgoing light path 10b.
[0026] The specific structure forming the first incident optical path 10a is not limited. For example, the probe body 10 includes an incident optical fiber, which has the first incident optical path 10a.
[0027] Of course, the specific structure forming the outgoing optical path 10b is not limited. For example, the probe body 10 includes an outgoing optical fiber, which has an outgoing optical path 10b.
[0028] The reflective component 21 has an incident area 21a and an exit area 21b. The incident area 21a is the region on the reflective component 21 used for receiving light signals. The exit area 21b is the region on the reflective component 21 used for receiving light signals.
[0029] The reflective component 21 is spaced apart from the first incident light path to form a gap space. In reality, the incident area 21a and the first incident light path form this gap space. Both the first window 221 and the second window 222 are located within this gap space and form a liquid passage 22a. The optical signal enters the optical path component 20 from the first incident light path, passes sequentially along the first light path 22b through the second window 222, the sample liquid in the liquid passage 22a, and the first window 221, and then enters the reflective component 21 from the incident area 21a. Thus, the optical signal directly contacts the sample liquid, causing a characteristic change, which is then measured by the spectrometer.
[0030] The liquid outlet 22a is connected to the outside, meaning that the sample liquid inside the liquid outlet 22a is connected to the sample cell, allowing the sample liquid to flow through the liquid outlet 22a. This allows for the acquisition of more sample liquid detection signals, resulting in more accurate detection results.
[0031] The exit region 21b and the exit optical path 10b are sealed together, forming a second optical path 22c. Thus, the optical signal in the second optical path 22c is completely isolated from the sample, and the optical signal only passes through the sample liquid once through the liquid inlet 22a. This ensures that the gap thickness between the first window 221 and the second window 222 forming the liquid inlet 22a is as close as possible to the measurement optical path, and that the distance between the measurement optical path and the gap inlet 22a is as close as possible. This guarantees that the optical path of the optical path component 20 is a single optical path, effectively reducing the impact of optical path error on the spectral detection results.
[0032] The exit area 21b and the exit optical path 10b are sealed, meaning that the second optical path 22c is separated from the outside world, and the specific separation method is not limited.
[0033] For example, the second optical path 22c is separated from the outside world by an opaque sealing cover 223. Thus, the sealing of the second optical path 22c prevents external light signals from entering, effectively reducing the influence of external signals on the measurement results.
[0034] The propagation directions of light in the first optical path 22b and the second optical path 22c are different, and their specific positional relationship can be set according to the actual situation.
[0035] For example, the first optical path 22b is parallel to the second optical path 22c, but the directions of light propagation are opposite.
[0036] For example, the extension directions of the first optical path 22b and the second optical path 22c intersect, forming an angle greater than 0°.
[0037] The third optical path 21c refers to the optical signal emitted in the first optical path 22b, which propagates from the incident area to the exit area within the reflective component 21. The optical signal changes its propagation direction within the reflective component 21, thereby allowing the first incident optical path 10a and the exit optical path 10b to be simultaneously located within the probe body 10, greatly improving the probe's flexibility and applicability.
[0038] The specific configuration of each optical path within the probe body 10 is not limited.
[0039] For example, please see Figure 3 A third lens 11 is provided in the first incident light path 10a. The light signal in the first incident light path 10a enters the lens, and the third lens 11 can efficiently convert the light signal into parallel light and reduce the loss of the light signal.
[0040] The materials of the optical path component 20 and the probe body 10 can be set according to the actual situation.
[0041] For example, the outer shell materials of the optical path component 20 and the probe body 10 include stainless steel, which has the characteristics of being resistant to organic solvents, acid and alkali corrosion and radiation. The structural connections of each part of the optical path component 20 are sealed by a circular ring, which can prevent sample liquid from entering the optical path component 20 and the probe body 10, effectively protecting the internal structure of the probe and ensuring the long-term stable operation of the probe.
[0042] In related technologies, immersion fiber optic probes employ a double optical path design, with the physical gap of the liquid passage being half the optical path (e.g., a 2mm optical path corresponds to a 1mm physical gap), allowing the optical signal to penetrate the sample twice. However, in measurements of short optical paths and samples with high viscosity, air bubbles in the sample are easily trapped in the narrow liquid passage. The optical signal passing through the air bubbles causes abnormal spectral signals, leading to inaccurate measurement results.
[0043] In the fiber optic probe of this embodiment, a liquid inlet 22a communicating with the outside is formed by the first window 221 and the second window 222, and a first optical path 22b is formed between the first incident optical path and the incident area 21a, passing through the second window 222, the liquid inlet 22a, and the first window 221. A second optical path 22c is formed between the exit area 21b and the exit optical path 10b, which is sealed. That is, the optical signal enters the reflective component 21 from the first optical path 22b and propagates along the third optical path 21c to the second optical path 22c. Furthermore, the optical signal in the first optical path 22b penetrates the sample once at the liquid inlet 22a, while the second optical path 22c is sealed and separated from the sample. Therefore, the optical signal does not penetrate the sample twice in the first optical path 22b, and the physical gap of the liquid inlet 22a of the fiber optic probe can be as close as possible to the optical path length. In the same optical path measurement, the fiber optic probe has a larger physical gap, and the bubbles in the sample are more likely to flow out from the liquid outlet 22a. This reduces the risk of bubbles getting stuck at the liquid outlet 22a and effectively prevents the light signal from passing through the bubbles and causing abnormal spectral signals, making the measurement results more accurate.
[0044] In one embodiment, the reflective component 21 includes a beam splitter located on a third optical path 21c. The third optical path 21c includes a second incident optical path, a reflected optical path, and a transmitted optical path. The beam splitter is located at the intersection of the second incident optical path, the reflected optical path, and the transmitted optical path. A second incident optical path is formed between the incident area 21a and the beam splitter, and a reflected optical path and a transmitted optical path are formed between the beam splitter and the exit area 21b.
[0045] Specifically, a beam splitter is an optical element that divides an incident light signal into transmitted and reflected light signals in a specific ratio. The light signal enters the beam splitter through a second incident light path, the reflected light signal exits through the reflected light path, and the transmitted light signal exits through the transmitted light path. Thus, a beam of light is split into two beams by the beam splitter. Fiber optic probes are connected to two spectrometers, enabling simultaneous ultraviolet-visible and near-infrared spectral detection, achieving full-band spectral measurement.
[0046] After the light is split by a beam splitter, the ratio of the intensity of the light signal in the reflected light path to the intensity of the light signal in the transmitted light path is called the beam splitting ratio. The specific beam splitting ratio of the beam splitter is not limited.
[0047] For example, the beam splitter has a beam splitting ratio of 50:50. As a result, the two light signals passing through the beam splitter have equal intensity, and both light signals have sufficient light intensity. When the light signals are transmitted to the spectrometer, it can effectively prevent low signal-to-noise ratio and ensure the accuracy of detection.
[0048] For example, the beam splitting ratio of a beam splitter is 30:70.
[0049] For example, the beam splitting ratio of a beam splitter is 70:30.
[0050] In one embodiment, please refer to Figure 4 The second optical path 22c includes a first beam splitter 223a and a second beam splitter 223b, which are separated from each other. The first beam splitter 223a is connected to the reflected light path, and the second beam splitter 223b is connected to the transmitted light path. Thus, the light signal reflected by the beam splitter can enter the first beam splitter 223a through the reflected light path, and the light signal transmitted by the beam splitter can enter the second beam splitter 223b through the transmitted light path. Since the first beam splitter 223a and the second beam splitter 223b are separated, the light signals in the first beam splitter 223a and the second beam splitter 223b do not interfere with each other, resulting in more accurate detection results.
[0051] In one embodiment, the fiber optic probe includes a first lens and a second lens, with the first lens located on the reflected light path and the second lens located on the transmitted light path, so that the light passing through the first lens and the second lens propagates in the same direction.
[0052] Specifically, the first lens and the second lens refer to optical elements capable of changing the direction of light signals and efficiently transmitting light. The first lens is placed in the reflected light path of the beam splitter, and the second lens is placed in the transmitted light path of the beam splitter. A beam of light is split into two beams by the beam splitter, and the two beams propagate in opposite directions. After passing through the first or second lens, the light propagates in the same direction in both the reflected and transmitted light paths. Thus, the light signals entering the first beam splitter 223a and the second beam splitter 223b propagate in the same direction. The first beam splitter 223a and the second beam splitter 223b are arranged in parallel, allowing them to be neatly arranged within the probe body 10, resulting in a smaller footprint for the probe body 10 and greater flexibility in sample liquid detection.
[0053] It should be noted that there are no restrictions on the optical elements that make the light propagation direction in the reflected light path and the transmitted light path the same.
[0054] For example, the direction of propagation of a light signal changes when it passes through the first lens, and the light signal passing through the first lens has the same direction as the light signal passing through the second lens.
[0055] For example, when a light signal passes through a second lens, its propagation direction changes, and the light signal passing through the second lens has the same direction as the light signal passing through the first lens.
[0056] For example, the propagation direction of the light signal changes in both the first and second lenses, and the light signal passing through the second lens has the same direction as the light signal passing through the first lens.
[0057] For example, the light signal changes its propagation direction through the optical reflective surface 211, and the light signal entering the first lens has the same direction as the light signal entering the second lens.
[0058] The specific material of the first lens is not limited.
[0059] For example, the first lens is made of quartz material, which is suitable for spectral detection in the wavelength range of 200 nm or greater and 2500 nm or less. Within the above wavelength range, the first lens has excellent optical performance and physical stability, and its light transmittance is extremely high, which can reduce the loss of optical signal and achieve low-attenuation transmission of optical signal, effectively meeting the needs of spectral detection.
[0060] The specific material of the second lens is not limited.
[0061] For example, the second lens is made of quartz material, which is suitable for spectral detection in the wavelength range of 200 nm or greater and 2500 nm or less. Within the above wavelength range, the second lens has excellent optical performance and physical stability, and its extremely high transmittance can reduce the loss of optical signal, realize low-attenuation transmission of optical signal, and effectively meet the needs of spectral detection.
[0062] The surface shape of the first lens is not limited.
[0063] For example, the first lens is a biconvex lens. Or, the first lens is a plano-convex lens. Or, the first lens is a concave-convex lens.
[0064] The surface shape of the second lens is not limited.
[0065] For example, the second lens is a biconvex lens. Or, the second lens is a plano-convex lens. Or, the second lens is a concave-convex lens.
[0066] In one embodiment, please refer to Figure 3 The reflective component 21 includes at least one optical reflective surface 211, and the second incident light path includes a first sub-light path and a second sub-light path. The first sub-light path is formed between the incident area 21a and the optical reflective surface 211, and the second sub-light path is formed between the optical reflective surface 211 and the beam splitter. The propagation directions of the light in the first sub-light path and the second sub-light path are different.
[0067] Specifically, the optical reflecting surface 211 refers to an optical element capable of changing the direction of the light signal. The light signal reaches the optical reflecting surface 211 through the first sub-optical path and is reflected by the optical reflecting surface 211 into the second sub-optical path. As a result, the propagation direction of the light signal changes, and the propagation direction of the light in the second optical path 22c connected to the second sub-optical path and the outgoing optical path 10b connected to the second optical path 22c also changes. This allows the first incident optical path 10a and the outgoing optical path 10b to be located in the same component, resulting in a smaller probe body 10 and greatly improving the flexibility and applicability of the probe.
[0068] The number of optical reflective surfaces 211 of the reflective component 21 is unlimited.
[0069] For example, the reflective component 21 includes at least two optical reflective surfaces 211. On the one hand, the optical reflective surfaces 211 are arranged at a specific angle so that they can change the propagation direction of a beam of light signal by 180°. On the other hand, by adjusting the distance between the optical reflective surfaces 211, the distance between the incident light signal and the reflected light signal can be precisely controlled. Thus, the reflective component 21 can accurately shift the light signal in the first optical path 22b by a certain distance and transmit it in the opposite direction to the second optical path 22c. Changing the arrangement of the optical reflective surfaces 211 adjusts the distance between the first incident light path 10a connected to the first optical path 22b and the exit light path 10b of the second optical path 22c, making the structure of the optical path component 20 and the probe body 10 smaller, greatly improving the flexibility and applicability of the probe.
[0070] It should be noted that the first sub-optical path can be a straight line. The first sub-optical path can also be a broken line.
[0071] Of course, the second sub-optical path can be a straight line. The second sub-optical path can also be a broken line.
[0072] In one specific embodiment, the reflective component 21 includes a plurality of optical reflective surfaces 211. By arranging the optical reflective surfaces 211 at a specific angle, the light signal reflected by the optical reflective surfaces 211 is totally internally reflected. This effectively prevents the loss of light signal in the reflective component 21, resulting in more accurate spectral measurement results.
[0073] In one embodiment, please refer to Figure 3 At least a portion of the first sub-optical path has light propagation in the opposite direction to at least a portion of the reflected optical path.
[0074] Specifically, the light propagation direction in the portion of the first sub-optical path near the first optical path 22b is opposite to that in the portion of the reflected optical path near the first beam splitter 223a. Therefore, the light propagation directions in the first optical path 22b and the reflected optical path connected to it, and in the first beam splitter 223a and the output optical path 10b connected to it, are opposite. This change in the direction of optical signal propagation allows the first incident optical path 10a and the output optical path 10b to be located in the same component, resulting in a smaller probe body 10 and greatly improving the probe's flexibility and applicability.
[0075] In one embodiment, at least a portion of the first sub-optical path has the opposite direction of light propagation to at least a portion of the transmission optical path.
[0076] Specifically, the light propagation direction in the portion of the first sub-optical path near the first optical path 22b is opposite to that in the portion of the transmitted optical path near the second beam splitter 223b. Therefore, the light propagation directions in the first optical path 22b and the reflected optical path connected to it, and the second beam splitter 223b and the emitted optical path 10b connected to it, are opposite. This change in the direction of optical signal propagation allows the first incident optical path 10a and the emitted optical path 10b to be located in the same component, resulting in a smaller probe body 10 and significantly improving the probe's flexibility and applicability.
[0077] In one embodiment, please refer to Figure 2 and Figure 4 The reflective component 21 includes a first housing, the first housing includes a window platform 212 having an incident area 21a, a first window slab 221 is disposed on the window platform 212, at least a portion of the first window slab 221 protrudes from the window platform 212 toward the side of the second window slab 222 to form a stepped structure together.
[0078] Specifically, the first housing is the housing that encloses the reflective component 21, and the window platform 212 is the side of the first housing near the second window 222. The first window 221 covers the incident area 21a of the window platform 212, and at least a portion of the first window 221 protrudes towards the second window 222 to form a protrusion. The protrusion of the first window 221 and the window platform 212 together form a stepped structure, and the protrusion is located on the first optical path 22b. Thus, the liquid passage 22a formed between the first window 221 and the second window 222 has a stepped shape. When the sample liquid enters the liquid passage 22a, the air bubbles in the sample liquid collide with the steps and break, effectively preventing sample air bubbles from interfering with short-path spectral detection, resulting in more accurate detection results.
[0079] It should be noted that the stepped structure can be a staggered structure formed between the entire first window panel 221 and the window platform 212. Alternatively, the stepped structure can be a step formed by a partial protrusion of the first window panel 221.
[0080] The specific shape of the protrusion on the first window 221 is not limited. It can be a circular protrusion or a rectangular protrusion.
[0081] The specific height of the protrusion in the first window panel 221 is not limited.
[0082] For example, the height difference between the first window panel 221 protrusion and the window platform 212 is 3mm.
[0083] The specific material of the first window piece 221 is not limited.
[0084] For example, the first window 221 is made of quartz material, which is suitable for spectral detection in the wavelength range of 200 nm or greater and 2500 nm or less. Within the above wavelength range, the first window 221 has excellent optical performance and physical stability, and its light transmittance is extremely high, which can reduce the loss of optical signal and realize low-attenuation transmission of optical signal, effectively meeting the needs of spectral detection.
[0085] The specific material of the second window panel 222 is not limited.
[0086] For example, the second window 222 is made of quartz material, which is suitable for spectral detection in the wavelength range of 200 nm or greater and 2500 nm or less. Within the above wavelength range, the second window 222 has excellent optical performance and physical stability, and its light transmittance is extremely high, which can reduce the loss of optical signal and realize low-attenuation transmission of optical signal, effectively meeting the needs of spectral detection.
[0087] In related technologies, when a sample absorbs incident light particularly strongly, a short-path fiber optic probe is required for measurement. However, the physical gap of the window opening of a short-path fiber optic probe is very small, and bubbles are easily generated during the process of liquid entering the gap, especially for samples with high viscosity. Once bubbles enter the gap, they are extremely difficult to expel.
[0088] In the fiber optic probe of this embodiment, at least a portion of the first window 221 protrudes towards the second window 222, forming a raised portion. The raised portion of the first window 221 and the window platform 212 together form a stepped structure, and the raised portion is located on the first optical path 22b. Therefore, the liquid inlet 22a formed between the first window 221 and the second window 222 is also stepped. When the sample liquid enters the liquid inlet 22a, air bubbles in the sample liquid collide with the steps and break, effectively preventing sample bubbles from interfering with short-path spectral detection and making the detection results more accurate.
[0089] In one specific embodiment, the reflective component 21 includes a second housing, and a second window 222 is disposed on the second housing. At least a portion of the second window 222 protrudes from the second housing towards the side of the first window 221. Thus, the liquid passage 22a formed between the first window 221 and the second window 222 is stepped. When the sample liquid enters the liquid passage 22a, air bubbles in the sample liquid collide with the step and break, effectively preventing sample air bubbles from interfering with short-path spectral detection, resulting in more accurate detection results.
[0090] In related technologies, the optical fiber probe forms a planar liquid passage window. When using short optical path measurement, the physical gap of the liquid passage is very small, especially when used for the detection of high viscosity sample liquids. Once air bubbles enter the liquid passage in the sample liquid, they will be extremely difficult to expel.
[0091] In the fiber optic probe of this embodiment, the liquid inlet 22a is set in a stepped shape. Therefore, when the sample liquid enters the liquid inlet 22a, the air bubbles in the sample liquid collide with the step and break, effectively preventing sample air bubbles from interfering with short optical path spectral detection, and the detection results are more accurate.
[0092] In one embodiment, the optical path component 20 is detachably connected to the probe body 10.
[0093] Specifically, the optical path component 20 is detachably connected to the probe body 10, rather than being fixed to the probe body 10 in a non-detachable manner. Therefore, when the optical path component 20 is damaged, only the optical path component 20 needs to be replaced, instead of replacing the entire fiber optic probe, which greatly improves the convenience of replacing the optical path component 20 in a radioactive environment.
[0094] As a detachable component, the optical path element 20 can be designed in a series with various optical path lengths. For example, the optical path element 20 has an optical path length of 2mm. Another example is that the optical path element 20 has an optical path length of 5mm. Yet another example is that the optical path element 20 has an optical path length of 10mm. Therefore, the detachable connection between the optical path element and the probe body 10 allows for convenient switching when the optical path needs to be adjusted in spectral detection, improving the flexibility of the detection process.
[0095] The specific connection method between the optical path component 20 and the probe body 10 is not limited.
[0096] For example, the optical path component 20 is connected to the probe body 10 by a thread. In actual use, users can easily connect the optical path component 20 with different optical paths directly to the probe body 10 according to specific detection needs, which greatly improves the flexibility and applicability of the fiber optic probe.
[0097] For example, the optical path component 20 is connected to the probe body 10 by a snap-fit connection.
[0098] In related technologies, fiber optic probes employ an integrated structural design, with the fiber optic components and the probe body being non-detachably connected. This makes the installation and removal of the fiber optic components in radioactive environments inconvenient. For example, the glove box is a radioactive environment with limited space, making the installation and removal of the fiber optic components difficult.
[0099] In this embodiment of the fiber optic probe, the optical path component 20 is detachably connected to the probe body 10, rather than being fixed to the probe body 10 in a non-detachable manner. Therefore, when the optical path component 20 is damaged, only the optical path component 20 needs to be replaced, instead of the entire fiber optic probe, significantly improving the convenience of replacing the optical path component 20 in a radioactive environment.
[0100] In one embodiment, please refer to Figure 1 and Figure 5The fiber optic probe includes a light source fiber optic line 30 and a detection spectrum fiber optic line 40. The light source fiber optic line 30 is connected to the first incident optical path 10a. The detection spectrum fiber optic line 40 includes a detection fiber bundle 41, a first detection fiber bundle 42, and a second detection fiber bundle 43. One end of the detection fiber bundle 41 is connected to the outgoing optical path 10b, and the other end is connected to the first detection fiber bundle 42 and the second detection fiber bundle 43, respectively.
[0101] Specifically, the light source fiber optic line 30 is connected to the first incident optical path 10a. The optical signal passes through the light source fiber optic line 30 sequentially through the first incident optical path 10a and the second window 222 into the sample liquid at the liquid outlet 22a. The optical signal undergoes a characteristic change upon contact with the sample liquid. Thus, the optical signal that produces the characteristic change can be detected and analyzed by a spectrometer to achieve spectral measurement.
[0102] One end of the detection fiber bundle 41 is connected to the output optical path 10b, meaning that one end of the detection spectral fiber line 40 is connected to the output optical path 10b. Thus, the optical signal generating characteristic changes can pass through the first window 221, the third optical path 21c, the output optical path 10b, and the detection spectral fiber line 40, and enter the spectrometer connected to the detection fiber line. This allows the optical signal generating characteristic changes to be detected and analyzed by the spectrometer, achieving spectral measurement.
[0103] It should be noted that the other end of the detection fiber bundle 41 is connected to the first detection fiber bundle 42 and the second detection fiber bundle 43, respectively. This achieves a one-to-two multi-fiber coupling, allowing the first detection fiber bundle 42 and the second detection fiber bundle 43 to be connected to two spectrometers respectively, enabling simultaneous ultraviolet-visible and near-infrared spectral detection, thus achieving full-band spectral measurement from ultraviolet-visible to near-infrared.
[0104] The specific length of the light source fiber optic cable 30 is not limited. Operators can select the length according to specific equipment layout and signal transmission distance requirements. For example, the length of the light source fiber optic cable 30 is 2m.
[0105] In one specific embodiment, one of the first detection fiber bundle 42 and the second detection fiber bundle 43 is connected to an ultraviolet-visible spectrometer, and the other is connected to a near-infrared spectrometer.
[0106] Specifically, the spectrometer connected to the first detection fiber bundle 42 and the second detection fiber bundle 43 is not limited.
[0107] For example, the first detection fiber bundle 42 is connected to the ultraviolet-visible spectrometer, and the second detection fiber bundle 43 is connected to the near-infrared spectrometer.
[0108] For example, the second detection fiber bundle 43 is connected to the ultraviolet-visible spectrometer, and the first detection fiber bundle 42 is connected to the near-infrared spectrometer.
[0109] In one specific embodiment, the light source fiber optic line 30 is a single quartz fiber with a diameter of 600 μm, and the detection spectrum fiber optic line 40 is composed of seven quartz fibers with a diameter of 200 μm. On one hand, the quartz fiber spectrum covers the visible to near-infrared spectral region, effectively transmitting the light signal emitted by the light source. On the other hand, the detection spectrum fiber optic line 40 and the light source fiber optic line 30 have the same light transmittance, enabling efficient docking and coupling. After the light signal from the light source fiber optic line 30 passes through the probe body 10 and the optical path accessory, the light signal can smoothly enter the detection spectrum fiber optic line 40, ensuring the stability and uniformity of the light signal during transmission.
[0110] In related technologies, when measuring the near-infrared absorption spectrum of aqueous samples, the strong absorption capacity of water for near-infrared light results in a weak near-infrared light signal received by the spectrometer, a low signal-to-noise ratio, and reduced accuracy of the detection results.
[0111] In the fiber optic probe of this embodiment, by increasing the light transmittance of the light source fiber and the detection spectrum fiber optic line 40, the intensity of the near-infrared light signal passing through the aqueous sample can be increased, thereby improving the signal-to-noise ratio and ensuring the accuracy of the detection results.
[0112] In one specific embodiment, the light source fiber optic cable 30 is detachably connected to the probe body 10 via the light source fiber optic interface 12; the detection spectrum fiber optic cable 40 is detachably connected to the probe body 10 via the detection spectrum fiber optic interface 13; and the detection spectrum fiber optic cable 40 is detachably connected to the spectrometer. The light source fiber optic cable 30 and the detection spectrum fiber optic cable 40 are partially designed as separate units from the probe body 10, thereby allowing for the installation and replacement of the probe body 10, the light source fiber optic cable 30, and the detection spectrum fiber optic cable 40 according to actual needs, significantly improving the convenience of fiber optic probes in radioactive environments.
[0113] The specific connection method between the light source fiber optic cable 30 and the probe body 10 is not limited.
[0114] For example, the light source fiber optic interface 12 is an interface compatible with the SMA905 connector. This ensures the stability and compatibility of the connection between the light source fiber optic cable 30 and the probe body 10, allowing the optical signal to smoothly enter the optical path of the probe body 10 through the connector.
[0115] The specific connection method between the detection spectral fiber optic cable 40 and the probe body 10 is not limited.
[0116] For example, the detection spectrum fiber optic interface 13 is an interface compatible with the SMA905 connector. This ensures the stability and compatibility of the connection between the detection spectrum fiber optic cable 40 and the probe body 10, allowing the optical signal to smoothly enter the optical path of the detection spectrum fiber optic cable 40 through the connector.
[0117] The specific connection method between the detection spectral fiber optic cable 40 and the spectrometer is not limited.
[0118] For example, the optical fiber connector for the detection spectrum is an SMA905 connector. This ensures the stability and compatibility of the connection between the optical fiber line 40 for the detection spectrum and the spectrometer, allowing the optical signal to smoothly enter the spectrometer through the connector.
[0119] In one embodiment, please refer to Figure 6 The detection fiber bundle 41 includes multiple first optical fibers 411, and each first optical fiber 411 is arranged in an array on a cross section perpendicular to the first optical fiber 411.
[0120] Specifically, the detection fiber bundle 41 has multiple first optical fibers 411 to increase the light transmission of the detection fiber bundle 41. The specific number of detection fiber bundles 41 is determined through precise design and calculation. This ensures that the light transmission of the detection fiber bundle 41 is greater than or equal to the light transmission of the light source fiber line 30, effectively preventing optical signal loss during transmission.
[0121] The specific shape of the arrangement of the first optical fiber 411 is not limited on the cross section perpendicular to the first optical fiber 411.
[0122] For example, in a cross-section perpendicular to the first optical fiber 411, the first optical fiber 411 is arranged in a circular pattern, minimizing the gaps between the detection fiber bundles 41. Therefore, the detection fiber bundles 41 can be efficiently coupled to the outgoing optical path 10b, ensuring the stability and uniformity of the optical signal during transmission.
[0123] For example, on a cross section perpendicular to the first optical fiber 411, the first optical fiber 411 is arranged in a regular hexagonal pattern.
[0124] For example, on a cross section perpendicular to the first optical fiber 411, the first optical fiber 411 is arranged in an equilateral triangle.
[0125] In one embodiment, please refer to Figure 7 The first detection fiber bundle 42 includes multiple second optical fibers 421, and each second optical fiber 421 is arranged in a column on a cross section perpendicular to the second optical fiber 421.
[0126] Specifically, multiple second optical fibers 421 are arranged in columns, so that the height of the second optical fibers 421 corresponds to the height of the entrance slits of the ultraviolet-visible spectral detector and the near-infrared spectral detector, thereby significantly improving the utilization rate of light energy and the detection accuracy.
[0127] In one embodiment, please refer to Figure 8 The second detection fiber bundle 43 includes multiple third optical fibers 431, and each third optical fiber 431 is arranged in a column on a cross section perpendicular to the third optical fiber 431.
[0128] Specifically, multiple third optical fibers 431 are arranged in columns, so that the height of the third optical fibers 431 corresponds to the height of the entrance slits of the ultraviolet-visible spectroscopy detector and the near-infrared spectroscopy detector, thereby significantly improving the utilization rate of light energy and the detection accuracy.
[0129] It should be noted that the number of first optical fibers 411 is the sum of the number of second optical fibers 421 and third optical fibers 431, and there is a one-to-one correspondence between the first optical fibers 411 and the second optical fibers 421 or the third optical fibers 431. This reduces the optical signal loss when the first optical fiber 411 enters the second optical fiber 421 and the third optical fiber 431, achieving low-attenuation optical signal transmission and improving the accuracy of spectral detection.
[0130] In one specific embodiment, please refer to Figures 6 to 8 The detection fiber bundle 41 has seven first optical fibers 411, the first detection fiber bundle 42 consists of three second optical fibers 421, and the second detection fiber bundle 43 consists of four third optical fibers 431. The first optical fibers 411 corresponding to the second optical fibers 421 are arranged at intervals, and the first optical fibers 411 corresponding to the third optical fibers 431 are also arranged at intervals. Both the first detection fiber bundles 42 and 43 are arranged in columns, and their heights correspond to the heights of the entrance slits of the ultraviolet-visible spectral detector and the near-infrared spectral detector, which can significantly improve the utilization rate of light energy and achieve highly sensitive full-band spectral measurement.
[0131] One embodiment of this application provides a method for using an optical fiber probe. The light source optical fiber is connected to a halogen tungsten lamp, and the first detection optical fiber bundle 42 and the second detection optical fiber bundle 43 are respectively connected to an ultraviolet-visible spectrometer and a near-infrared spectrometer. The optical path component 20 and part of the probe body 10 are immersed in the sample solution. The spectral data of the sample liquid can be acquired by software to obtain the spectral signals of the sample liquid in the ultraviolet-visible and near-infrared full bands. Moreover, the operation is convenient during the experiment and effectively prevents the interference of bubbles with spectral detection.
[0132] In one specific embodiment, a 5mm optical path fiber probe is used, and the sample being detected is Ni. 2+ Standard solution. Its UV-Vis absorption spectrum is as follows: Figure 9 As shown, curve a1 represents 8.0 mol / L Ni 2+ Standard solution, curve b1 represents 7.0 mol / L Ni 2+ The standard solution, and the c1 curve represent 6.0 mol / L Ni. 2+ Standard solution, curve d1 represents 5.0 mol / L Ni 2+ The standard solution, and the e1 curve represent 4.0 mol / L Ni. 2+ Standard solution.
[0133] In one specific embodiment, a 5mm optical path fiber probe was used, and the sample being detected was an HNO3 solution. Its near-infrared absorption spectrum is as follows: Figure 10 As shown, curve a2 represents a 1.5 mol / L pure HNO3 solution, curve b2 represents a 1.0 mol / L pure HNO3 solution, curve c2 represents a 0.5 mol / L pure HNO3 solution, curve d2 represents a 0.2 mol / L pure HNO3 solution, and curve e2 represents a 0.1 mol / L pure HNO3 solution.
[0134] In one specific embodiment, a 5mm optical path fiber optic probe is used to detect a sample containing Ni. 2+ Fe 3+ Cr 2+ A mixed sample solution of HNO3. Its ultraviolet-visible to near-infrared spectrum is as follows. Figure 11 As shown, curve a3 represents the Ni content in the mixed sample solution. 2+ The concentration is 5.5 g / L, Fe 3+ The concentration was 6.0 g / L, Cr 2+ The concentration was 4.5 g / L, and the HNO3 concentration was 1.0 mol / L; curve b3 represents the Ni concentration in the mixed sample solution. 2+ The concentration was 6.0 g / L, Fe 3+ The concentration was 5.0 g / L, Cr 2+ The concentration of Ni was 2.5 g / L, and the concentration of HNO3 was 2.0 mol / L; the c3 curve represents the concentration of Ni in the mixed sample solution. 2+ The concentration is 3.5 g / L, Fe 3+ The concentration was 3.5 g / L, Cr 2+ The concentration is 0.5 g / L, and the HNO3 concentration is 3.5 mol / L.
[0135] In the description of this application, the references to terms such as "in one embodiment," "in some embodiments," "in a specific embodiment," or "exemplary," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the embodiments of this application. In this application, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine the different embodiments or examples described in this application, as well as the features of the different embodiments or examples.
[0136] The above are merely preferred embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application are included within the protection scope of this application.
Claims
1. An optical fiber probe, characterized in that, include: The probe body has a first incident optical path and an outgoing optical path; An optical path component includes a reflective component and a probe window component. The reflective component has an incident area and an exit area, and is spaced apart from the first incident optical path to form a gap space. The probe window component includes a first window and a second window. The first window is located in the gap space near the reflective component, and the second window is located in the gap space near the probe body. The first window and the second window are spaced apart to form a liquid passage opening communicating with the outside. A first optical path is formed between the first incident optical path and the incident area, passing through the second window, the liquid passage opening, and the first window. The exit area is sealed with the exit optical path, and a second optical path is formed. The light propagation directions in the first optical path and the second optical path are opposite. A third optical path is formed within the reflective component from the incident area to the exit area.
2. The fiber optic probe according to claim 1, characterized in that, The reflective component includes a beam splitter located on the third optical path. The third optical path includes a second incident optical path, a reflected optical path, and a transmitted optical path. The beam splitter is located at the intersection of the second incident optical path, the reflected optical path, and the transmitted optical path. The second incident optical path is formed between the incident area and the beam splitter, and the reflected optical path and the transmitted optical path are formed between the beam splitter and the exit area.
3. The fiber optic probe according to claim 2, characterized in that, The second optical path includes a first beam splitter and a second beam splitter, the first beam splitter and the second beam splitter are separated, the first beam splitter is connected to the reflected optical path, and the second beam splitter is connected to the transmitted optical path.
4. The fiber optic probe according to claim 2, characterized in that, The fiber optic probe includes a first lens and a second lens. The first lens is located on the reflected light path, and the second lens is located on the transmitted light path, so that the light passing through the first lens and the second lens propagates in the same direction.
5. The fiber optic probe according to claim 2, characterized in that, The reflective component includes at least one optical reflective surface, and the second incident light path includes a first sub-light path and a second sub-light path. The first sub-light path is formed between the incident area and the optical reflective surface, and the second sub-light path is formed between the optical reflective surface and the beam splitter. The light propagation directions in the first sub-light path and the second sub-light path are opposite.
6. The fiber optic probe according to claim 5, characterized in that, At least a portion of the first sub-optical path has a light propagation direction opposite to that of at least a portion of the reflected optical path; and / or, At least a portion of the first sub-optical path has a light propagation direction opposite to that of at least a portion of the transmitted optical path.
7. The fiber optic probe according to any one of claims 1-6, characterized in that, The reflective assembly includes a first housing, the first housing including a window platform having the incident area, a first window slat disposed on the window platform, and at least a portion of the first window slat protruding from the window platform toward one side of the second window slat to collectively form a stepped structure.
8. The fiber optic probe according to any one of claims 1-6, characterized in that, The optical path component is detachably connected to the probe body.
9. The fiber optic probe according to any one of claims 1-6, characterized in that, The fiber optic probe includes a light source fiber optic line and a detection spectrum fiber optic line. The light source fiber optic line is connected to the first incident optical path. The detection spectrum fiber optic line includes a detection fiber bundle, a first detection fiber bundle, and a second detection fiber bundle. One end of the detection fiber bundle is connected to the outgoing optical path, and the other end is connected to the first detection fiber bundle and the second detection fiber bundle, respectively.
10. The fiber optic probe according to claim 9, characterized in that, The detection fiber bundle includes multiple first optical fibers, and each of the first optical fibers is arranged in an array on a cross-section perpendicular to the first optical fibers; and / or, The first detection fiber bundle includes multiple second optical fibers, and on a cross-section perpendicular to the second optical fibers, each second optical fiber is arranged in a column; and / or, The second detection fiber bundle includes multiple third fibers, which are arranged in columns on a cross section perpendicular to the third fibers.