A detection light path structure with adjustable optical path length

Abstract

The utility model discloses a kind of detection optical path structures of adjustable optical path length, including the first plane mirror and the second plane mirror of parallel arrangement, the laser of the side of the first plane mirror is equipped with towards the second plane mirror emission laser;Further include at least one group of curved surface mirror group being positioned above the first plane mirror and the second plane mirror, the curved surface mirror group includes the first curved surface mirror and the second curved surface mirror of interval arrangement;Further include prism group being positioned at the second curved surface mirror side, the prism group is used to guide the reflected laser of lower layer to the first curved surface mirror on upper layer reflection;Each prism group includes semi-transparent prism in lower side and total reflection prism in upper side, the rear side of the semi-transparent prism is equipped with the detector of detection laser;Solve the current situation that existing detection optical path structure cannot adjust optical path length according to detection gas type, improve the general-purpose of the composition structure of detection optical path structure.

Description

Technical Field

[0001] This utility model relates to the field of gas detection sensor technology, and in particular to a detection optical path structure with adjustable optical path length. Background Technology

[0002] Gas detection is an important technology widely used in industrial production, environmental monitoring, and safety protection. Gas detection helps us understand gas concentration, composition, and their impact on human health and the environment, enabling us to take appropriate measures to protect public health and environmental safety. Common gas detection methods include sensor detection, mass spectrometry, and chemical detection.

[0003] In the optical sensor of the sensor detection method, the laser will be absorbed when it passes through a special gas corresponding to its wavelength during the propagation process. The concentration of the special gas can be detected by the intensity change before and after the light intensity is absorbed.

[0004] The existing detectors use a laser reflection optical path structure to ensure the optical path length, so that the laser is fully absorbed during gas detection, forming a significant intensity change and improving detection accuracy.

[0005] The detection of different gases requires different optical path lengths. Existing detectors design their internal detection optical path structure as a fixed structure, such as a cavity structure, according to different gas types. This requires the design of a unique detection optical path structure in different detectors, resulting in a decrease in the versatility of the structure. Utility Model Content

[0006] (a) Technical issues

[0007] The purpose of this invention is to provide a detection optical path structure with adjustable optical path length, which solves the problem that the existing detection optical path structure cannot adjust the optical path length according to the type of gas being detected, and improves the versatility of the detection optical path structure.

[0008] (II) Technical Solution

[0009] To achieve the above objectives, this utility model provides the following technical solution:

[0010] An adjustable optical path detection optical path structure includes a first planar lens and a second planar lens arranged in parallel. A laser that emits laser light toward the second planar lens is provided on one side of the first planar lens. The structure also includes at least one set of curved lens groups disposed above the first and second planar lenses. The curved lens groups include a first curved lens and a second curved lens arranged at intervals. The structure also includes a prism group disposed on one side of the second curved lens. The prism group is used to guide the reflected laser light from the lower layer to be reflected onto the upper first curved lens.

[0011] Each prism group includes a semi-transparent prism at the bottom and a total reflection prism at the top, with a detector for detecting laser light located behind the semi-transparent prism.

[0012] Preferably, the semi-transparent prism and the total reflection prism are rotated and adjusted relative to the axis of the vertical horizontal plane.

[0013] Preferably, the semi-transparent prism has a first reflecting surface facing the side of the total reflection prism, and the total reflection prism has a second reflecting surface facing the side of the semi-transparent prism. The first reflecting surface and the second reflecting surface are arranged perpendicularly. A semi-transparent film is provided on the first reflecting surface, and a total reflection film is provided on the second reflecting surface.

[0014] Preferably, both the semi-transparent prism and the total reflection prism are triangular prism structures.

[0015] Preferably, the first curved lens has a first reflective surface and a second reflective surface that protrude toward one side of the second curved lens and are spaced apart, and the second curved lens has a concave third reflective surface.

[0016] Preferably, the detector and the laser are rotated and adjusted relative to the axis of the vertical horizontal plane.

[0017] Preferably, prism groups are provided on both sides of two longitudinally adjacent second curved surface lenses. The semi-transparent prism in each prism group is at the same height as the lower second curved surface lens, and the total reflection prism in each prism group is at the same height as the upper second curved surface lens.

[0018] Preferably, the first and second curved lenses in each group of curved lenses are at the same height.

[0019] (III) Beneficial Effects

[0020] The laser emitted by the laser is reflected at the bottom layer by using a first and a second planar lens. The optical path length is increased by adding a group of curved lenses above, and the number of curved lenses can be increased or decreased according to the actual required optical path length. At the same time, the reflected laser is transmitted from the bottom layer to the top layer by a prism group, ensuring the continuity of laser reflection.

[0021] By placing the detector behind the semi-transparent prism located below, after each layer of reflected laser light is emitted, one reflected laser light can be detected by the detector to achieve signal acquisition at different optical path lengths, while the other reflected laser light is reversed by the total reflection lens and transmitted to the upper layer of curved lens group to continue increasing the laser reflection optical path length. Intermediate detection does not affect the reflected light path.

[0022] The detection pipeline structure in this invention has high versatility, and the optical path length can be flexibly adjusted by adding or removing curved lens groups. Attached Figure Description

[0023] Figure 1 This is a first-view structural diagram of an embodiment of the present utility model;

[0024] Figure 2 This is a second-view structural schematic diagram of an embodiment of the present utility model;

[0025] Figure 3 This is a schematic diagram of the reflected light path between the first plane mirror and the second plane mirror in an embodiment of this utility model;

[0026] Figure 4 This is a schematic diagram of the reflected light path between the first curved lens and the second curved lens in an embodiment of this utility model;

[0027] Figure 5 This is a schematic diagram of the structure of the first curved lens in an embodiment of the present invention;

[0028] Figure 6 This is a schematic diagram of the structure of the second curved lens in an embodiment of this utility model;

[0029] Figure 7 This is a schematic diagram of the reflected light path of the prism assembly in an embodiment of this utility model;

[0030] exist Figures 1 to 7 In the diagram, the correspondence between component names or lines and the drawing numbers is as follows:

[0031] First planar lens 1, second planar lens 2, laser 3, curved lens group 4, first curved lens 41, first reflective curved surface 411, second reflective curved surface 412, second curved lens 42, third reflective curved surface 420, prism group 5, semi-transparent prism 51, first reflecting surface 510, total reflection prism 52, second reflecting surface 520, detector 6. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0033] See Figures 1-7As shown, an embodiment of this utility model proposes an adjustable optical path structure for integration into a gas detection sensor, which increases the optical path by reflecting laser light. It includes a first planar mirror 1 and a second planar mirror 2 arranged in parallel. A laser 3 is provided on one side of the first planar mirror 1, emitting laser light towards the second planar mirror 2. The laser light emitted by the laser 3 is reflected multiple times between the first and second planar mirrors before being emitted. Generally, the number of reflections can be adjusted by adjusting the distance between the first and second planar mirrors, or by adjusting the angle at which the laser light enters the laser 3, thus adjusting the optical path length of the laser light during reflection and transmission.

[0034] Simultaneously, it also includes at least one set of curved lens groups 4 disposed above the first planar lens 1 and the second planar lens 2. The curved lens group 4 includes a first curved lens 41 and a second curved lens 42 disposed at intervals. By increasing the number of curved lens groups 4, the laser reflected from between the first planar lens 1 and the second planar lens 2 can be further reflected, increasing the optical path length. The laser transmitted to the first curved lens 41 is reflected to the second curved lens 42 and then reflected back to the first curved lens 41 until it is reflected out of the reflection area. Furthermore, the use of the first curved lens 41 and the second curved lens 42 can achieve a longer optical path length adjustment in a smaller space.

[0035] If it is necessary to further increase the optical path length, a curved lens group 4 can be added on top.

[0036] The laser leaving the reflection zone from the lower layer needs to be transmitted to the reflection zone of the upper layer. Therefore, a prism group 5 is also included on one side of the second curved lens 42. The prism group 5 is used to guide the reflected laser from the lower layer to be reflected onto the first curved lens 41 of the upper layer. The function of the prism group 5 is to transmit and reflect the laser leaving the reflection zone from the lower layer in the vertical direction and then enter the reflection zone of the upper layer.

[0037] like Figure 4 As shown, for example, the laser emitted from the reflection area enclosed by the first planar lens 1 and the second planar lens 2 in the lower layer is transmitted to the first curved lens 41 after the reflection direction is changed by the prism group 5. This achieves multiple reflections between the first curved lens 41 and the second curved lens 42 before leaving the upper reflection area. If the optical path needs to be increased, the curved lens group 4 can be further stacked until the optical path length requirement is met.

[0038] Therefore, by using the same structural configuration, the optical path length can be adjusted within a smaller space by increasing or decreasing the number of curved lens groups 4.

[0039] Each prism group 5 includes a semi-transparent prism 51 located at the bottom and a total reflection prism 52 located at the top. A detector 6 for detecting laser is provided on the rear side of the semi-transparent prism 51. By using the semi-transparent prism 51, one beam of the received laser can be passed through the detector 6 for detection, and the other beam can be reflected to the total reflection prism 52. In this way, the detection of intermediate optical path signals can be achieved without affecting the reflection of the optical path.

[0040] Regarding the laser 3 and the detector 6, mature products used in the applicant's previously disclosed gas detection sensors can be adopted. However, specific optical signal processing is not a technical problem that needs to be solved in this embodiment. This embodiment is still for protection of improvements to the light reflection structure.

[0041] In order to adapt to the angle of the laser emitted from the lower layer and adjust the incident angle of the upper layer transmitted into the curved lens group 4, the semi-transparent prism 51 and the total reflection prism 52 can be rotated and adjusted relative to the axis of the vertical horizontal plane. Specifically, when integrated into the gas detection sensor, the angle can be adjusted by means of a threaded connection. It should be further noted that the semi-transparent prism 51 and the total reflection prism 52 can be adjusted at their angles independently.

[0042] Specifically, such as Figure 7 As shown, a first reflecting surface 510 facing the total internal reflection prism 52 is provided on the semi-transparent prism 51, and a second reflecting surface 520 facing the semi-transparent prism 51 is provided on the total internal reflection prism 52. The first reflecting surface 510 and the second reflecting surface 520 are arranged perpendicularly, that is, the angle between the first reflecting surface 510 and the second reflecting surface 520 and the horizontal plane is 45°, which can realize the reflection of the lower laser to the upper laser in a spatially parallel manner. A semi-transparent film is provided on the first reflecting surface 510, and a total internal reflection film is provided on the second reflecting surface 520, which can improve the laser reflection efficiency.

[0043] Specifically, both the semi-transparent prism 51 and the total reflection prism 52 are triangular prism structures, which facilitates positioning and installation through the non-sloping side and facilitates angle adjustment.

[0044] The first curved lens 41 and the second curved lens 42 can achieve an increased optical path within a smaller space, meaning more reflections. Specifically, for example... Figure 5 , Figure 6 As shown, the first curved lens 41 is provided with a first reflective curved surface 411 and a second reflective curved surface 412 that protrude toward the second curved lens 42 and are spaced apart. The second curved lens 42 is provided with a concave third reflective curved surface 420. By using the spaced first reflective curved surface 411 and second reflective curved surface 412 in conjunction with the third reflective curved surface 420, the coverage area of ​​reflected light can be increased, and the space occupied can be further compressed by the curvature.

[0045] Specifically, the detector 6 and the laser 3 are rotated and adjusted relative to the axis of the vertical horizontal plane. The detector 6 is adjusted synchronously with the angle adjustment of the semi-transparent prism 51 to ensure a large coverage area for receiving light. The angle adjustment of the laser 3 can realize the adjustment of the laser incident angle, mainly by adjusting the reflection angle and optical path between the first plane mirror and the second plane mirror.

[0046] To accommodate the multiple sets of curved lens groups 4, prism groups 5 are provided on both sides of two longitudinally adjacent second curved lens groups 42. The semi-transparent prism 51 in each prism group 5 is at the same height as the lower second curved lens group 42, and the total reflection prism 52 in each prism group 5 is at the same height as the upper second curved lens group 42. This allows the laser emitted from the reflection area to be received by the lower semi-transparent prism 51 and reflected to the total reflection prism 52, while the total reflection prism 52 ensures that the laser is reflected onto the upper first curved lens group 41.

[0047] Furthermore, the first curved lens 41 and the second curved lens 42 in each set of curved lens groups 4 are at the same height so that they can be positioned and installed on the same plane after being integrated into the gas detection sensor.

[0048] This embodiment mainly focuses on improving the detection optical path structure in the gas detection sensor, that is, adjusting the internal laser reflection angle and optical path length. The same structural composition can be used for different gas types, and the optical path can be adjusted by changing the number of components. This can standardize the installation position size in the gas detection sensor, making it easier to assemble gas detection sensors with different optical paths by changing the number of components.

[0049] For information on the principles of gas detection, please refer to the relevant technical content that the applicant has previously disclosed.

[0050] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0051] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0052] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A detection optical path structure with adjustable optical path length, characterized in that: It includes a first planar lens (1) and a second planar lens (2) arranged in parallel, and a laser (3) is provided on one side of the first planar lens (1) to emit laser light toward the second planar lens (2). It also includes at least one set of curved lens groups (4) disposed above the first planar lens (1) and the second planar lens (2), the curved lens group (4) including a first curved lens (41) and a second curved lens (42) disposed at intervals. It also includes a prism group (5) disposed on one side of the second curved lens (42), the prism group (5) being used to guide the reflected laser from the lower layer to the first curved lens (41) of the upper layer; Each prism group (5) includes a semi-transparent prism (51) located below and a total reflection prism (52) located above, with a detector (6) for detecting lasers located on the rear side of the semi-transparent prism (51).

2. The detection optical path structure with adjustable optical path length according to claim 1, characterized in that: The semi-transparent prism (51) and the total reflection prism (52) are rotated and adjusted relative to the axis of the vertical horizontal plane.

3. The detection optical path structure with adjustable optical path length according to claim 2, characterized in that: The semi-transparent prism (51) is provided with a first reflecting surface (510) facing the side of the total reflection prism (52), and the total reflection prism (52) is provided with a second reflecting surface (520) facing the side of the semi-transparent prism (51). The first reflecting surface (510) and the second reflecting surface (520) are arranged perpendicularly. The first reflecting surface (510) is provided with a semi-transparent film, and the second reflecting surface (520) is provided with a total reflection film.

4. The detection optical path structure with adjustable optical path length according to claim 3, characterized in that: Both the semi-transparent prism (51) and the total reflection prism (52) are triangular prism structures.

5. The detection optical path structure with adjustable optical path length according to claim 3, characterized in that: The first curved lens (41) has a first reflective surface (411) and a second reflective surface (412) that protrude toward the side of the second curved lens (42) and are spaced apart. The second curved lens (42) has a concave third reflective surface (420).

6. The detection optical path structure with adjustable optical path length according to claim 5, characterized in that: The detector (6) and the laser (3) are rotated and adjusted relative to the axis of the vertical horizontal plane.

7. The detection optical path structure with adjustable optical path length according to claim 6, characterized in that: Two adjacent second curved surface lenses (42) are provided with prism groups (5) on both sides. The semi-transparent prism (51) in each prism group (5) is at the same height as the lower second curved surface lens (42), and the total reflection prism (52) in each prism group (5) is at the same height as the upper second curved surface lens (42).

8. The detection optical path structure with adjustable optical path length according to claim 7, characterized in that: In each set of curved lens groups (4), the first curved lens (41) and the second curved lens (42) are at the same height.

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