Multi-optical-path optical fiber type near-infrared probe

Abstract

A multi-optical-path optical fiber type near-infrared probe comprises a cylindrical cavity, a middle plate and an optical window base which are sequentially connected in a sealed mode. N Glan joints are uniformly distributed above the cylindrical cavity, and N optical fiber joint assemblies with convergence angles are mounted on the upper surface of the middle plate and used for receiving N infrared optical fibers penetrating through the cylindrical cavity, converting incident infrared light into parallel infrared light and emitting the parallel infrared light to the optical window seat; a light receiving lens is mounted on the lower surface of the middle plate; a sapphire light window is arranged on the light window seat, parallel infrared light is converged through the sapphire light window and then irradiates a sample to be detected, and reflected light reflected by the sample to be detected is transmitted through the sapphire light window and then is converged to the end face of the light emitting optical fiber through the light receiving lens. Pure optical design is adopted in the explosion-proof probe, the detonation risk existing in an active power supply type light source scheme used by products of the same type is avoided, the high-grade explosion-proof requirement that electricity cannot be used in a key explosion-proof area is met, and meanwhile the problems that an explosion-proof probe is high in complexity and large in size are solved due to the characteristics of the explosion-proof probe.

Description

Technical Field

[0001] The utility model belongs to the technical field of infrared spectrum solid detection, and particularly relates to a multi - optical - path fiber - type near - infrared probe, which is particularly suitable for explosion - proof environments. Background Technique

[0002] The non - contact reflection probe is a technology that can detect objects with infrared light without contact and plays an important role in production fields such as industry and agriculture, such as on - line monitoring of coal, feed, grain, etc. With the development of technology and processes, the requirements for on - line monitoring are becoming more and more extensive and strict, greatly increasing the application demand for non - contact reflection probes.

[0003] Current products and solutions use a halogen light source built into the probe. After powering the probe, the bulb emits light to irradiate the sample. Since many application scenarios of non - contact reflection probes are powders and there is dust in the working environment, reaching the explosion - proof level, the probes all need to be sealed or installed through explosion - proof windows. Although this meets some scenarios, it loses efficiency and cannot fully guarantee long - term sealing and safety. For higher - level explosion - proof requirements, it still cannot be met. For example, for the detection of high - risk powders such as gunpowder and explosives, on - site power supply is not allowed, so existing products cannot be used. Content of the Utility Model

[0004] The purpose of the utility model is to address the above - mentioned problems existing in the prior art and propose a multi - optical - path fiber - type near - infrared probe, which is particularly suitable for explosion - proof environments. By using the method of introducing infrared light through optical fibers, it meets the requirement of no electricity introduction in high - level explosion - proof requirements. This method can ensure long - term safe use without potential hazards, and improves the incident light energy through the multi - path infrared light guiding method. It has strong scalability, can expand the number of light guiding paths according to needs, and at the same time, the probe structure is compact and the volume is small.

[0005] The technical solution of the utility model is as follows:

[0006] A multi - optical - path fiber - type near - infrared probe, characterized in that it includes a cylindrical cavity, an intermediate plate, and an optical window seat that are hermetically connected in sequence;

[0007] Above the cylindrical cavity, N Glan joints are evenly distributed for threading infrared optical fibers, and the cylindrical cavity is hollow for accommodating infrared optical fibers;

[0008] On the upper surface of the intermediate plate, N fiber - optic connector assemblies at a converging angle are installed, which are used to receive N infrared optical fibers passing through the cylindrical cavity and convert the incident infrared light into parallel infrared light and emit it to the optical window seat; on the lower surface of the intermediate plate, a light - collecting lens is installed.

[0009] A sapphire optical window is provided on the optical window seat. After the parallel infrared light is converged by the sapphire optical window, it irradiates the sample to be measured. The reflected light reflected by the sample to be measured is transmitted through the sapphire optical window and then converged by the light receiving lens to the end face of the outgoing optical fiber.

[0010] Furthermore, it further includes a support column fixed to the middle plate and an optical fiber platform fixed to the support column.

[0011] Furthermore, the support columns and the optical fiber connector assembly are arranged at intervals.

[0012] Furthermore, an outgoing optical fiber connector is provided in the center of the optical fiber platform, so that the light converged by the light receiving lens falls on the outgoing optical fiber connector and is exactly received by the optical fiber.

[0013] Furthermore, the optical fiber connector assembly is sequentially connected by an incident optical fiber connector, a lens and a lens retaining cap. By tightening the lens retaining cap on the incident optical fiber connector and pressing the small lens in the middle at the same time, the optical fiber connector assembly can convert the point light emitted by the optical fiber into parallel light for outgoing.

[0014] Furthermore, a lifting ring is also installed above the cylindrical cavity for hoisting scenarios. It can also be used after being fixed by screws after being disassembled.

[0015] The position of the Glan joint corresponds to that of the optical fiber connector assembly and is used for connecting the optical fiber.

[0016] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0017] 1. The infrared light is introduced by using an optical fiber, and by converting it into parallel light and performing multi-path light merging, the requirement of no electricity conduction in high-level explosion-proof requirements is met. This method can ensure long-term safe use without hidden dangers.

[0018] 2. The present utility model is based on the principle of diffuse reflection, realizes non-contact measurement, has strong expandability, can expand the designed number of light guiding paths according to needs, enhance the light intensity, and at the same time the probe structure is compact and the volume is small. Description of the Drawings

[0019] Figure 1 It is a schematic structural diagram of Embodiment 1 of the optical path fiber type near-infrared probe of the present utility model.

[0020] Figure 2 It is a schematic internal structure diagram of Embodiment 1 of the optical path fiber type near-infrared probe of the present utility model.

[0021] Figure 3 It is a schematic internal structure diagram of Embodiment 2 of the optical path fiber type near-infrared probe of the present utility model.

[0022] Figure 4This is a schematic structural diagram of a fiber optic connector assembly in an optical path fiber type near-infrared probe of the present utility model.

[0023] Figure 5 This is a schematic diagram of the optical path in an optical path fiber type near-infrared probe of the present utility model.

[0024] In the figure: 1 - cylindrical cavity, 2 = intermediate plate, 3 - optical window seat, 4 - sapphire optical window, 5 - light-receiving lens, 6 - fiber optic connector assembly, 7 - support column, 8 - fiber optic platform, 9 - outgoing fiber optic connector, 10 - hanging ring, 11 - Glan connector, 12 - incoming fiber optic connector, 13 - lens, 14 - lens retaining cap. Specific embodiments

[0025] The following further describes the present utility model in detail with reference to the accompanying drawings, but the protection scope of the present utility model should not be limited thereby.

[0026] Please refer to Figure 1 , Figure 1 , which is a schematic structural diagram of Embodiment 1 of an optical path fiber type near-infrared probe of the present utility model. As shown in the figure, in this embodiment N = 4. A multi-path optical fiber type near-infrared probe is cylindrical and is divided into three upper, middle and lower layer structures of a cylindrical cavity 1, an intermediate plate 2 and an optical window seat 3. On the upper surface of the cylindrical cavity 1, four Glan connectors 11 and two hanging rings 10 are installed. The Glan connector is mainly used for threading infrared optical fibers and plays a sealing role; the hanging ring is for hanging scenarios, and if it is a fixed scenario, it can be removed and fixed with screws. There is an optical fiber connector in the center of the probe for connecting the outgoing optical fiber.

[0027] Figure 2 , which is a schematic internal structure diagram of Embodiment 1 of an optical path fiber type near-infrared probe of the present utility model. As shown in the figure, four fiber optic connector assemblies 6 at a converging angle are installed on the upper surface of the intermediate plate 2, which are used to receive N infrared optical fibers passing through the cylindrical cavity 1 and convert the incident infrared light into parallel infrared light and emit it to the optical window seat 3; a light-receiving lens 5 is installed on the lower surface of the intermediate plate 2. A sapphire optical window 4 is provided on the optical window seat 3. After the parallel infrared light is converged by the sapphire optical window 4, it irradiates the sample to be measured. The reflected light reflected by the sample to be measured, after being transmitted by the sapphire optical window 4, is converged by the light-receiving lens 5 to the end face of the outgoing optical fiber, as Figure 5 shown. In this embodiment, the light-receiving lens 5 is a convex lens, which is used to converge the reflected infrared light. At the same time, the four fiber optic connector assemblies on the intermediate plate are at a converging angle, so that the light entering the optical fiber can be converted into parallel light and converge together at a certain height to irradiate the sample. The height of the converging point can be changed by adjusting the design. The fiber optic connector assembly 6 is sequentially connected by an incoming fiber optic connector 12, a lens 13 and a lens retaining cap 14, as Figure 4As shown. By tightening the lens retaining cap on the incident fiber optic connector, while pressing the small lens in the middle, the fiber optic connector assembly can convert the point light emitted by the optical fiber into parallel light for output.

[0028] Figure 3 This is a schematic diagram of the internal structure of Embodiment 2 of the optical path fiber type near-infrared probe of the present invention. Four support columns are evenly distributed and installed on the middle plate, and the fiber optic platform is installed on the support columns; a receiving fiber optic connector 9 is installed at the center of the fiber optic platform. When infrared light is reflected from the sample, it passes through the sapphire optical window and is converged by the convex lens on the end face of the output optical fiber.

Claims

1. A multi-path optical fiber near-infrared probe, characterized in that: It comprises a cylindrical cavity (1), an intermediate plate (2) and a light window seat (3) which are sealed and connected in sequence; N gland connectors (11) are evenly distributed above the cylindrical cavity (1) for connecting infrared optical fibers. The cylindrical cavity (1) is hollow and is used to accommodate infrared optical fibers. The upper surface of the intermediate plate (2) is provided with N optical fiber connector assemblies (6) at a convergence angle, which are used to receive N infrared optical fibers passing through the cylindrical cavity (1) and convert the incident infrared light into parallel infrared light to be emitted to the optical window seat (3); the lower surface of the intermediate plate (2) is provided with a light receiving lens (5); A sapphire light window (4) is provided on the light window seat (3); the parallel infrared light is converged by the sapphire light window (4) and then illuminates the sample to be tested; the reflected light reflected by the sample to be tested is transmitted through the sapphire light window (4) and then converged onto the end face of the light-emitting optical fiber through the light-collecting lens (5).

2. The multi-path optical fiber near-infrared probe according to claim 1, characterized in that: It also includes a support column (7) fixed to the middle plate (2), and an optical fiber platform (8) fixed to the support column (7).

3. The multi-path optical fiber near-infrared probe according to claim 2, characterized in that: The support column (7) and the optical fiber connector assembly (6) are arranged at intervals.

4. The multi-path optical fiber near-infrared probe according to claim 2, characterized in that: An outgoing optical fiber connector (9) is provided in the center of the optical fiber platform (8).

5. The multi-path optical fiber near-infrared probe according to any one of claims 1 to 4, characterized in that: The optical fiber connector assembly (6) is formed by sequentially connecting an incident optical fiber connector (12), a lens (13) and a lens pressure cap (14).

6. The multi-path optical fiber near-infrared probe according to any one of claims 1 to 4, characterized in that: A hanging ring (10) is also installed above the cylindrical cavity (1).

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