CN111045200A - Light reflection assembly for prolonging optical path - Google Patents
Light reflection assembly for prolonging optical path Download PDFInfo
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- CN111045200A CN111045200A CN201911198047.2A CN201911198047A CN111045200A CN 111045200 A CN111045200 A CN 111045200A CN 201911198047 A CN201911198047 A CN 201911198047A CN 111045200 A CN111045200 A CN 111045200A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B17/00—Systems with reflecting surfaces, with or without refracting elements
- G02B17/02—Catoptric systems, e.g. image erecting and reversing system
- G02B17/023—Catoptric systems, e.g. image erecting and reversing system for extending or folding an optical path, e.g. delay lines
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N21/03—Cuvette constructions
- G01N21/0303—Optical path conditioning in cuvettes, e.g. windows; adapted optical elements or systems; path modifying or adjustment
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B17/00—Systems with reflecting surfaces, with or without refracting elements
- G02B17/02—Catoptric systems, e.g. image erecting and reversing system
- G02B17/06—Catoptric systems, e.g. image erecting and reversing system using mirrors only, i.e. having only one curved mirror
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- Optics & Photonics (AREA)
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- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention relates to the field of optical measurement, in particular to an optical reflection assembly for prolonging an optical path. The light reflection assembly comprises a first reflection part and a second reflection part which are oppositely matched with each other, and the first reflection part and the second reflection part are provided with a plurality of reflection mirror surface groups. The optical path of the initial incident light in the system to be measured is increased through the reflection of the reflecting mirror surface group between the two reflecting parts. The invention has the beneficial effects that: 1. under the condition of not changing the size and appearance of the light path of the existing optical measuring instrument equipment, the measuring light path of a system to be measured is increased, the detection limit of the existing method is reduced, and the sensitivity is improved. 2. The reflection action between the two reflection parts ensures that the light ray injection and light ray injection directions are perpendicular to a system to be measured, and the existing optical measuring instrument can be matched with the light reflection component through simple light path adjustment.
Description
Technical Field
The invention belongs to the field of optical measurement, and particularly relates to an optical reflection assembly for prolonging an optical path.
Background
The lambert-beer law is the basis for a number of optical analysis methods, the quantitative analysis of which is based on the fact that the measured absorbance a is proportional to the concentration c of the light-absorbing substance and to the thickness b (optical path) of the absorbing layer. The analysis method based on the law is widely applied to the fields of environment, biological health, water conservancy and the like, and has the characteristics of low instrument and equipment cost, relatively simple operation, high result accuracy, good reproducibility and the like.
The optical path size has an important influence on the sensitivity and detection limit of analytical methods based on the lambert-beer law. However, the optical path of the cuvette or the flow optical detection cell for the conventional spectrophotometric analysis is mostly fixed in the range of 1 to 3 cm, and a sample with a small absorption coefficient or low concentration is often difficult to determine, so that the range of the species and concentration of the substance for the conventional spectrophotometric analysis is greatly limited.
The microplate detector, also commonly called as a microplate reader, is a conventional instrument for enzyme-linked immunoassay, is a phase-change professional spectrophotometer, and is mainly different from the traditional spectrophotometric analysis in that the volume of an absorption cell is small (microliter magnitude), and the light path direction is vertical to the solution level. This makes the optical path length of the microplate detector lower than that of conventional spectrophotometric analysis, which also greatly limits the application range of photometric analysis of microplate detectors. In the measurement activity of the immersion type full spectrum analyzer, because the optical path length of the instrument is fixed, the optical path length of the instrument can be increased only when the concentration of a detected object in a water body to be detected is low, so that the manufacturing cost and the weight of the instrument are greatly increased, and the portability and the universality range of the instrument are reduced. The optical detection of gas also faces the trouble of limited optical path length, and the problem can be partially solved only by calibrating and remotely detecting high-concentration standard gas at the present stage.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide a light reflection assembly for extending an optical path, which can effectively increase the optical path of light in a system under test, thereby reducing the detection limit of the system under test and improving the detection sensitivity, and has good practicability.
The invention provides the following technical scheme:
the light reflection assembly is characterized by comprising a first reflection part and a second reflection part, wherein the first reflection part and the second reflection part are respectively arranged at two sides of a light transmission surface of a system to be measured; the first reflecting part comprises m groups of first reflecting mirror surface groups, the second reflecting part comprises n groups of second reflecting mirror surface groups, m is an integer which is greater than or equal to 1, and n is an integer which is greater than or equal to 0; the first reflector surface group and the second reflector surface group are formed by intersecting two reflector surfaces at an included angle of 90 degrees, the included angle of 90 degrees formed by the two reflector surfaces is arranged towards a system to be measured, and an included angle bisection plane is perpendicular to a light transmitting plane of the system to be measured;
the first reflector surface group of the first reflector and the second reflector surface group of the second reflector are arranged in a relatively staggered mode, so that initial incident light sequentially advances under the reflection of the first reflector surface group and the second reflector surface group.
As a further technical solution of the present invention, the light reflection assembly is provided with a light ray injection hole/slit and a light ray injection hole/slit, and the light ray injection hole/slit are both disposed at the second reflection portion or at the second reflection portion and the first reflection portion, respectively.
As a further technical solution of the present invention, the first reflecting mirror surface group on the first reflecting portion and the second reflecting mirror surface group on the second reflecting portion may be set to rotate at different angles on a plane parallel to the light transmission plane of the system to be measured with the corresponding incident light as an axis.
As a preferred technical solution of the present invention, the initial incident light source of the light reflection assembly is a point light source or a line light source.
As a further technical scheme of the invention, the system to be detected can be in a liquid or gaseous form.
As a further technical scheme of the invention, the optical path length depends on the vertical width of the system to be measured between the first reflection part and the second reflection part and the number of times of reflection of the light rays in the system to be measured.
As a preferable technical scheme of the invention, the light reflection assembly can be used in a single set or multiple sets of built-in positioning instrument light path system, and can also be freely arranged outside a container of a system to be measured for use.
As a further technical solution of the present invention, the light reflection assembly may include a first reflection portion, a second reflection portion, and a fixed support frame connecting the two reflection portions, wherein the fixed support frame is a rectangular solid with three sides connected and a U-shaped or hollow opening, and is sleeved on the periphery of a container of a system to be tested during testing.
As a further technical scheme of the invention, the multiple sets of light reflection components which are internally arranged and positioned in the optical path detection system of the instrument can be exchanged and selected in a manual or automatic mode so as to adapt to different optical path requirements.
The invention has the beneficial effects that:
1. the first reflection part and the second reflection part which are matched with each other are arranged on the two sides of the light-transmitting surface of the system to be detected, so that when light rays are emitted into the system to be detected, the measurement optical path is effectively increased through multiple reflections, the detection limit of the existing method is reduced under the condition that the appearance and the size of the existing optical measurement instrument are not changed, and the detection sensitivity is improved.
2. The reflecting mirror surface groups are arranged on the first reflecting part and the second reflecting part, so that the directions of incident light and emergent light are perpendicular to a system to be measured, and the existing optical measuring instrument can be matched with the optical reflecting component through slight adjustment of an optical path system.
3. The invention increases the measuring optical path by arranging the reflecting mirror surface groups which are matched with each other and increase the optical path through light reflection, the reflecting mirror surface groups are not in direct contact with a system to be measured, the possibility of damage of the mirror surface is reduced, and the invention has strong practicability.
Drawings
FIGS. 1a and 1b are block diagrams of a light emitting module of the present invention for use in conventional cuvette detection;
FIGS. 2a and 2b are block diagrams of a light emitting module of the present invention for flow-based optical inspection;
FIG. 3 is a block diagram of a light emitting assembly of the present invention for use in microplate detector testing;
FIGS. 4a and 4b are block diagrams of a light emitting assembly of the present invention for use in immersion plenoptic sensing;
FIGS. 5a and 5b are block diagrams of a light emitting module of the present invention for optical detection of gases;
FIGS. 6a and 6b are schematic diagrams of light rays in two sets of combined-structure mirrors;
FIG. 7 is a schematic view of a light path of a light emitting module of the present invention for a rectangular light-transmitting surface, wherein the center point ⊙ is a light incident point, the center point X is a light emergent point, and L is a distance between the light incident point and the light emergent pointiIs the initial point of incidence of the light, LeThe dotted line represents the front and back sequence of the incident and emergent rays as the final emergent position point of the rays;
FIG. 8 is a schematic view of a light path of a light emitting module for a circular light-transmitting surface of the present invention, wherein a central point ⊙ is a light incident point, a central point X is a light emergent point, and a central point L is a light incident pointiIs the initial point of incidence of the light, LeThe dotted line represents the front and back sequence of the incident and emergent rays as the final emergent position point of the rays;
the designations in the drawings have the following meanings:
1. a first reflection section; 2. a second reflection section; 3. a first set of mirror facets; 4. a second mirror surface group; 5. holes/slits into which light is injected; 6. holes/slits through which light is emitted;
Detailed Description
The present invention will be described in detail with reference to the following examples.
Example 1
As shown in fig. 1a and 1b, a cuvette light-reflecting member having a long optical path includes a first reflecting portion 1, a second reflecting portion 2, a light-injecting hole/slit 5, and a light-injecting hole/slit 6. Wherein, a plurality of first reflecting mirror surface groups 3 which are distributed correspondingly to each other are arranged on the first reflecting part 1, and a plurality of second reflecting mirror surface groups 4 which are distributed correspondingly to each other are arranged on the second reflecting part 2.
As shown in fig. 1a, the number of first reflecting mirror surface groups 3 in the first reflecting part 1 of the cuvette light reflecting member is 1 group larger than the number of second reflecting mirror surface groups 4 provided in the second reflecting part 2. After entering from the light entrance hole/slit 5 on the second reflection part 2, the light is reflected by the first reflection mirror surface group 3 on the first reflection part 1 to the second reflection mirror surface group 4 on the second reflection part 2, and then reflected continuously in turn, and finally the light exits from the light exit hole/slit 6 on the second reflection part 2, and at this time, the initial incident light and the final exit light are located on the same side of the solution.
As shown in fig. 1b, the number of the first reflecting mirror surface groups 3 on the first reflecting part 1 of the cuvette light reflecting assembly is the same as the number of the second reflecting mirror surface groups 4 provided on the second reflecting part 2. After entering from the light entrance hole/slit 5 on the second reflection part 2, the light is reflected by the first reflection mirror surface group 3 on the first reflection part 1, reflected to the second reflection mirror surface group 4 on the second reflection part 2, and then reflected continuously, finally the light exits from the light exit hole/slit 6 on the first reflection part 1, and the initial incident light and the final emergent light are located at the opposite side of the solution.
In this example, the cuvette light reflection assembly may be fixed and built in the light path detection system, or may be designed to be external, such as in the form of a cuvette sleeve.
Example 2
As shown in fig. 2a and 2b, a flow-through cuvette cell and light emitting module for use in a flow-through optical detection system. Wherein the light emitting assembly includes a first reflection part 1, a second reflection part 2, a light incidence hole/slit 5, and a light incidence hole/slit 6. The first reflecting part 1 is provided with a plurality of first reflecting mirror surface groups 3 which are distributed correspondingly, and the second reflecting part 2 is provided with a plurality of second reflecting mirror surface groups 4 which are distributed correspondingly.
As shown in fig. 2a, a flow cuvette for a flow optical detection system has an inlet and an outlet penetrating through a system to be detected, and the cross section of the cuvette is rectangular. The first reflecting part 1 and the second reflecting part 2 of the light reflecting component are respectively arranged on two sides of the light-transmitting cell wall of the cross section to be measured of the flowing cuvette cell. The number of the first reflecting mirror surface groups 3 on the first reflecting part 1 of the cuvette cell light reflecting assembly is the same as the number of the second reflecting mirror surface groups 4 on the second reflecting part 2. After the point light source is injected from the light injection hole/slit 5 on the second reflection part 2, the point light source is reflected to the second reflection mirror surface group 4 on the second reflection part 2 through the first reflection mirror surface group 3 on the first reflection part 1, and then is reflected sequentially, the final light is injected from the light injection hole/slit 6 on the first reflection part 1, and the initial incident light and the final emergent light are positioned at two sides of the solution to be measured.
As shown in fig. 2b, unlike the optical emission module for flow-type optical detection shown in fig. 2a, the number of first mirror surface groups 3 on the first reflection part 1 of the cuvette optical reflection module is one group larger than the number of second mirror surface groups 4 provided on the second reflection part 2. The light incidence hole/slit 5 and the light incidence hole/slit 6 are both on the second reflection part 2, and the initial incident light and the final exit light are on the same side of the solution.
The light emitting component can be arranged in a light path detection system in a single set or multiple sets. When multiple sets of optical path detection components are arranged in the optical path detection system, different optical path lengths are realized by rotating the optical reflection components corresponding to different pairs. The cross section of the flow cuvette pool can be square, circular or other shapes, and can be adjusted by the technicians in the field according to actual needs.
When the system to be detected flows in the flow type cuvette pool, the concentration of the system to be detected changes along the flowing direction of the liquid. According to the invention, the first reflecting mirror surface group 3 and the second reflecting mirror surface group 4 which are distributed correspondingly are respectively arranged on two sides of the light-transmitting wall of the cuvette pool, light rays are emitted into the flow cuvette pool at a certain cross section which is vertical to the flow direction of the solution, and after multiple reflections are carried out on the same cross section, the change of concentration can be captured more sensitively, so that the detection sensitivity and accuracy are improved.
Example 3
As shown in fig. 3, a light emitting assembly for extended path length measurement in a microplate detector.
The first reflection part 1 and the second reflection part 2 of the light reflection assembly are respectively fixed in a micropore plate detector light path detection system and are positioned at two sides of a micropore plate solution, and optical detection of solutions in different micropores in a micropore plate is realized through movement of the micropore plate.
In this embodiment, the first reflective part 1 and the second reflective part 2 are respectively provided with a first reflective mirror surface group 3 and a second reflective mirror surface group 4 which are correspondingly distributed, so that light can enter along a direction perpendicular to the solution in the micro-pores and then exit perpendicular to the solution in the micro-pores.
The light reflection assemblies can be single set or multiple sets and are arranged in the micropore plate detector light path detection system, and different optical path lengths are realized by rotating the light reflection assemblies corresponding to different pairs.
Example 4
As shown in FIGS. 4a and 4b, a light emitting assembly for an immersion full spectrum detector for extended optical path measurement.
The first reflection part 1 and the second reflection part 2 of the light reflection assembly are respectively fixed in the immersion full spectrum detector light path detection system, are positioned at two sides of the water/water solution to be detected, and are sealed in the optical transparent sealing window. The first reflector surface group 3 and the second reflector surface group 4 which are distributed correspondingly enable light to be emitted in a direction perpendicular to the water/aqueous solution to be measured and then emitted perpendicular to the water/aqueous solution.
The light reflection assemblies can be arranged in the immersion full-spectrum detector light path detection system in a single set or multiple sets, and different optical path lengths are realized by rotating the light reflection assembly sets corresponding to different pairs.
Example 5
As shown in fig. 5a and 5b, a light emitting assembly for gas optical extended path detection.
And a first reflection part 1 and a second reflection part 2 of the light reflection assembly are respectively fixed in the optical path detection system of the gas optical detector and are positioned at two sides of the light transmission surface of the gas to be detected or the container/cell thereof.
In this embodiment, the first reflective portion 1 and the second reflective portion 2 are respectively provided with a first reflective mirror surface group 3 and a second reflective mirror surface group 4 which are correspondingly distributed, so that light can be incident along a direction perpendicular to the gas to be measured and then emitted perpendicular to the gas to be measured.
The light reflection assemblies can be positioned in the gas optical detection optical path system in a single set or in multiple sets, and different optical path lengths are realized by rotating the light reflection assemblies corresponding to different pairs.
Example 6
FIGS. 6a and 6b are schematic views showing the light direction of two combinations according to the present invention; in fig. 6a, the reflector group 3 and the reflector group 4 are arranged at two sides of the parallel light-transmitting surface in a staggered manner, and the angle bisectors of the 90-degree included angle between the two reflector groups are parallel. At this time, after the light is injected from the light injection hole/slit 5 on the second reflection part 2 or injected from the emergent light of the previous mirror surface group, the light is emitted to the reflection mirror surface group 4 under the continuous two-time reflection of the reflection mirror surface group 3, and then is emitted to the first reflection part 1 after the continuous two-time reflection of the reflection mirror surface group 4, so that the incident light and the emergent light are on the same surface after the multiple reflection, and the optical path of the light in the system to be measured is increased.
In fig. 6b, the reflector group 3 and the reflector group 4 are arranged at two sides of the light transmission surface in a staggered manner, and the angle bisectors of the 90-degree included angles of the two reflector groups are perpendicular to each other. At this time, after the light is injected from the light injection hole/slit 5 on the second reflection part 2 or injected through the emergent light of the previous mirror surface group, the light is emitted to the reflection mirror surface group 4 under the two reflections of the reflection mirror surface group 3, and then is emitted to the first reflection part 1 after the two reflections of the reflection mirror surface group 4, so that the initial incident light and the final emergent light are on different surfaces through the sequential reflection of the combination structure, the light path direction of the light is also converted while the light path direction in the system to be measured is increased.
Furthermore, the first reflecting mirror surface group 3 on the first reflecting part 1 and the second reflecting mirror surface group 4 on the second reflecting part 2 can be arranged on a parallel surface relative to the light transmission surface of the system to be measured by rotating by different angles with the corresponding incident light as an axis, so that the path of the corresponding emergent light in the system to be measured is changed, and the optical path range of the initial incident light of the point light source in the system to be measured is further extended.
Example 7
Fig. 7 is a schematic view showing one of the ray paths of the light emitting module of the present invention for a rectangular light transmission surface, which includes a plurality of mirror surface sets as shown in fig. 6a and 6 b. The light rays are injected at the position shown by Li and are reflected in sequence by a plurality of combined structures shown in figure 6a, and the light rays are in a plane. The set of mirror facets 4 is arranged in the configuration shown in fig. 6b such that the light rays reflected by the set of mirror facets 4 are perpendicular to the plane of the light rays in front. Such sequential combination ultimately enables the rays to follow the path trajectories shown in dashed lines in fig. 7 in sequence.
Furthermore, the reflecting mirror group 3 and the reflecting mirror group 4 can be rotated and combined at any angle on a parallel surface relative to the light transmission surface of the system to be measured by taking the corresponding incident light as an axis, and the required optical path size is selected in a limited reflecting space, so that the reflected light path is in a broken line or arc track. Fig. 8 is a schematic diagram showing one of the spiral light paths of the light emitting module of the present invention on the circular light transmitting surface. The setting can comprehensively consider the size of the light-transmitting surface of the system to be detected, and the optical path of light rays in the system to be detected is increased to the maximum extent during detection.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The light reflection assembly for prolonging the optical path is characterized by comprising a first reflection part (1) and a second reflection part (2), wherein the first reflection part (1) and the second reflection part (2) are respectively arranged at two sides of a system to be measured; the first reflecting part (1) comprises m groups of first reflecting mirror surface groups (3), the second reflecting part (2) comprises n groups of second reflecting mirror surface groups (4), m is an integer which is more than or equal to 1, and n is an integer which is more than or equal to 0; the reflecting mirror surface groups of the first reflecting mirror surface group (3) and the second reflecting mirror surface group (4) are formed by intersecting two reflecting mirror surfaces at an included angle of 90 degrees, the included angle of 90 degrees formed by the two reflecting mirror surfaces is arranged towards a system to be measured, and an included angle bisector is perpendicular to the system to be measured;
the first reflecting mirror surface group (3) of the first reflecting part (1) and the second reflecting mirror surface group (4) of the second reflecting part (2) are arranged in a relatively staggered mode, so that initial incident light sequentially moves forward under the reflection of the first reflecting mirror surface group (3) and the second reflecting mirror surface group (4).
2. An optical reflection assembly for extending an optical path according to claim 1, wherein the optical reflection assembly is provided with a light entrance hole/slit (5) and a light exit hole/slit (6), and the light entrance hole/slit (5) and the light exit hole/slit (6) are both provided in the second reflection portion (2) or in the second reflection portion (2) and the first reflection portion (1), respectively.
3. The optical reflection assembly according to claim 1, wherein the first mirror surface group (3) of the first reflection unit (1) and the second mirror surface group (4) of the second reflection unit (2) are rotatable by different angles on a plane parallel to the transparent plane of the system under test with their respective incident lights as central axes.
4. The light reflection assembly as claimed in claim 1, 2 or 3, wherein the light reflection assembly has an initial incident light source which is a point light source or a line light source.
5. The optical reflection assembly as claimed in claim 1, wherein the system under test is in liquid or gaseous form.
6. The optical reflection assembly according to claim 1, 2 or 3, wherein the optical path length is determined by the vertical width of the system under test between the first reflection unit (1) and the second reflection unit (2) and the number of times the light is reflected in the system under test.
7. The optical reflection assembly as claimed in claim 1, wherein the optical reflection assembly can be used in a single or multiple sets of internal positioning instruments or can be freely placed outside a container of a system to be measured.
8. The optical reflection assembly according to claim 7, wherein the optical reflection assembly comprises a first reflection portion (1), a second reflection portion (2) and a fixed support frame connecting the first reflection portion (1) and the second reflection portion (2), the fixed support frame is a cuboid with three sides connected and a U-shaped or hollow opening, and the fixed support frame is sleeved on the periphery of a container of a system to be tested during testing.
9. The light emitting module of claim 7, wherein the sets of light reflecting modules are manually or automatically switched to accommodate different optical path requirements.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911198047.2A CN111045200A (en) | 2019-11-29 | 2019-11-29 | Light reflection assembly for prolonging optical path |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911198047.2A CN111045200A (en) | 2019-11-29 | 2019-11-29 | Light reflection assembly for prolonging optical path |
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| CN111045200A true CN111045200A (en) | 2020-04-21 |
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| CN201911198047.2A Pending CN111045200A (en) | 2019-11-29 | 2019-11-29 | Light reflection assembly for prolonging optical path |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111650737A (en) * | 2020-07-13 | 2020-09-11 | 中国科学院光电技术研究所 | Adjusting method and device for off-axis reflective optical system |
| CN111856703A (en) * | 2020-07-21 | 2020-10-30 | 山东大学 | Device for adjusting light beam height |
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| CN111856703A (en) * | 2020-07-21 | 2020-10-30 | 山东大学 | Device for adjusting light beam height |
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