Small-volume wavelength division multiplexing structure for six-wavelength gas sensor

Abstract

The utility model relates to a small volume wavelength division multiplexing structure for a six-wavelength gas sensor, which comprises a first mounting surface, a second mounting surface, a third mounting surface, a fourth mounting surface, a fifth mounting surface and a fifth mounting surface, a reflecting diaphragm I, a reflecting diaphragm II and an optical channel I are arranged on the first mounting surface, and an optical filter I, an optical filter II and an optical channel II are arranged on the second mounting surface. A PBS prism, a third optical filter and a fourth optical filter are arranged on the third mounting face, a first passage is reserved between the PBS prism and the third optical filter, a second passage is reserved between the third optical filter and the fourth optical filter, a third reflecting diaphragm is arranged on the fourth mounting face, a third optical channel, a fourth optical channel and a fifth optical channel are arranged on the fifth mounting face, and a fourth reflecting diaphragm is arranged on the fifth mounting face. An optical rotation sheet is arranged in the third optical channel; the multi-wavelength narrow-wavelength combiner has the advantages that by analyzing the wavelength intervals, adjusting the placing sequence of the optical filters and additionally arranging the PBS prisms and the optical rotators, the purpose of combining multi-wavelength and narrow-wavelength intervals is achieved, meanwhile, the size cannot be greatly changed, and the efficiency of an optical system and the manufacturing efficiency are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of optical communication especially relates to a small volume wavelength division multiplexing structure for six wavelength gas sensor. BACKGROUND

[0002] In modern optical communication systems and optical sensing technologies, with the continuous growth of data transmission demand, efficient utilization of fiber bandwidth becomes crucial. Dense wavelength division multiplexing (DWDM) technology, as an effective means, can simultaneously transmit multiple optical signals of different wavelengths on a physical medium (such as a single-mode optical fiber), thereby significantly improving transmission capacity.

[0003] Multi-wavelength gas sensor is a device that uses different wavelengths of light to interact with specific gas molecules to detect and analyze gas composition and concentration. By combining waves, a single optical fiber can deliver multiple different wavelength optical signals, greatly simplifying the physical structure of the system, and easily adding or removing specific wavelengths to adapt to different detection needs, improving detection efficiency.

[0004] However, when implementing multi-wavelength combining, narrow wavelength spacing may be encountered, such as the above six-wavelength gas sensor, multi-wavelength, narrow wavelength spacing may be less than 40mm, usually including:

[0005] λ1-λ3 emission wavelengths: 1631.4mm, 1650.9nm, 1680.2nm respectively;

[0006] λ4-λ6 emission wavelengths, 1566.2nm, 1529.2nm, 1578.2nm respectively;

[0007] Among the above wavelengths, the wavelength spacing in λ1-λ3 is less than 40mm, and the wavelength spacing in λ4-λ6 is less than 40mm, which cannot be combined using conventional 45° filters.

[0008] The traditional solution usually uses two 13.5° MUX structures to complete multi-wavelength combining, which results in a large overall package size, making it difficult to achieve miniaturization design of the device. For example, in a compact environment where multiple functional modules need to be integrated, such a large volume design greatly limits its application range.

[0009] Another common alternative is to use a single 13.5° MUX, which can reduce the volume occupancy to some extent, but increases the number of reflections of the tail end incident light, making the optical path longer and affecting the coupling efficiency of the system. This problem is particularly prominent in high-precision application scenarios, such as multi-wavelength detection in gas sensors, which have strict requirements on signal strength and stability.

[0010] Based on this, the present case is proposed. Utility model content

[0011] The utility model discloses a kind of small volume wavelength division multiplexing structures for six wavelength gas sensor, to realize the combination of multiple wavelength, narrow wavelength interval, and the volume of entire wavelength division multiplexing structure will not have too much change, and high optical system efficiency and manufacturing efficiency are both relatively optimal.

[0012] In order to achieve the above object, the technical scheme of the utility model is as follows:

[0013] A small volume wavelength division multiplexing structure for six wavelength gas sensor, including carrier, the carrier includes first to fifth five mounting surfaces, hollow space is opened in carrier for light path to pass through;Reflective diaphragm one, reflective diaphragm two and light channel one are equipped on the first mounting surface, filter piece one, filter piece two and light channel two are equipped on the second mounting surface, PBS prism, filter piece three and filter piece four are equipped on the third mounting surface, and passageway one is reserved between PBS prism and filter piece three, passageway two is reserved between filter piece three and filter piece four, reflective diaphragm three is equipped on the fourth mounting surface, light channel three, light channel four and light channel five are arranged on the fifth mounting surface, and optical rotatory piece is equipped in light channel three;

[0014] The PBS prism is used for transmitting horizontal polarization light, and reflecting vertical polarization light;The optical rotatory piece is used for rotating horizontal polarization light into vertical polarization light;

[0015] Horizontal polarization light from filter piece one is transmitted through filter piece one and PBS prism in sequence and reaches light channel one and is outputted;

[0016] Horizontal polarization light from filter piece two is transmitted through filter piece two and filter piece three in sequence and reaches reflective diaphragm two, is reflected by reflective diaphragm two, passes through passageway one and reaches filter piece one, is reflected by filter piece one and reaches PBS prism, is transmitted by PBS prism and reaches light channel one and is outputted;

[0017] Horizontal polarization light from light channel two is transmitted by filter piece four and reaches reflective diaphragm one, is reflected by reflective diaphragm one, passes through passageway two and reaches filter piece two, is reflected by filter piece two and reaches filter piece three, is transmitted by filter piece three and reaches reflective diaphragm two, is reflected by reflective diaphragm two, passes through passageway one and reaches filter piece one, is reflected by filter piece one and reaches PBS prism, is transmitted by PBS prism and reaches light channel one and is outputted;

[0018] Horizontal polarization light from light channel three is rotated into vertical polarization light by optical rotatory piece and reaches reflective diaphragm three, is reflected by reflective diaphragm three and reaches PBS prism, is reflected by PBS prism and reaches light channel one and is outputted;

[0019] The horizontally polarized light incident from the light channel four is reflected by the reflecting film three, reaches the filter three, is reflected by the filter three, reaches the reflecting film two, is reflected by the reflecting film two, passes through the passage one, reaches the filter one, is reflected by the filter one, reaches the PBS prism, is transmitted by the PBS prism, reaches the light channel one, and is outputted;

[0020] The horizontally polarized light incident from the light channel five is reflected by the reflecting film three, reaches the filter four, is reflected by the filter four, reaches the reflecting film one, is reflected by the reflecting film one, passes through the passage two, reaches the filter two, is reflected by the filter two, reaches the filter three, is transmitted by the filter three, reaches the reflecting film two, is reflected by the reflecting film two, passes through the passage one, reaches the filter one, is reflected by the filter one, reaches the PBS prism, is transmitted by the PBS prism, reaches the light channel one, and is outputted.

[0021] Further, the light channel two is provided with the filter five for transmitting one of the lights incident into the light channel two.

[0022] Further, the carrier comprises a mother carrier and an embedded carrier, the first mounting surface and the second mounting surface are arranged on the mother carrier, and a mounting groove is arranged on the mother carrier for embedding the embedded carrier, and the third mounting surface, the fourth mounting surface and the fifth mounting surface are arranged on the embedded carrier.

[0023] Further, the reflecting film three comprises three independent reflecting films, and the three reflecting films correspond to the filter three, the filter four and the filter five respectively.

[0024] Further, the filter one transmits the light with a wavelength of 1631.4 nm and reflects the light with other wavelengths;

[0025] The filter two transmits the light with a wavelength of 1650.9 nm and reflects the light with other wavelengths;

[0026] The filter three reflects the light with a wavelength of 1529.2 nm and transmits the light with other wavelengths;

[0027] The filter four reflects the light with a wavelength of 1578.2 nm and transmits the light with other wavelengths;

[0028] The filter five transmits the light with a wavelength of 1680.2 nm and reflects the light with other wavelengths.

[0029] Further, the carrier adopts a metal support.

[0030] The utility model discloses the advantages in

[0031] 1. By analyzing each wavelength interval, adjusting the filter placement order, and adding a PBS prism and a rotatory film, the purpose of combining multiple wavelengths and narrow wavelength intervals is achieved, and the volume will not change too much, which is more suitable for subsequent matching tube shells, improves the efficiency of the optical system and the manufacturing efficiency, and has good applicability for future eight-wavelength, ten-wavelength, and more wavelength designs;

[0032] 2. The structure of the embedded carrier can double the application wavelength, and the angles of the carrier can be easily adjusted to achieve the function of combining waves, ensuring that the structure volume will not change too much. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 A three-dimensional structure schematic diagram of the wave division multiplexing structure in the embodiment;

[0034] Figure 2 A three-dimensional structure schematic diagram of the wave division multiplexing structure in the embodiment; Figure 1 A three-dimensional structure schematic diagram of the wave division multiplexing structure in the embodiment;

[0035] Figure 3 A three-dimensional structure schematic diagram of the wave division multiplexing structure in the embodiment; Figure 1 A three-dimensional structure schematic diagram of the wave division multiplexing structure in the embodiment;

[0036] Figure 4 A three-dimensional structure schematic diagram of the wave division multiplexing structure in the embodiment;

[0037] Figure 5 A three-dimensional structure schematic diagram of the wave division multiplexing structure in the embodiment;

[0038] Figure 6 A three-dimensional structure schematic diagram of the wave division multiplexing structure in the embodiment;

[0039] REFERENCE NUMERALS

[0040] ATTACHMENT Figure 4 , ATTACHMENT Figure 5 , ATTACHMENT Figure 6 In the □ of the above, the horizontal polarized light is represented, and the vertical polarized light is represented.

[0041] 1, first mounting surface; 2, second mounting surface; 3, third mounting surface; 4, fourth mounting surface; 5, fifth mounting surface; 6, reflective film one; 7, reflective film two; 8, reflective film three; 9, passageway one; 10, passageway two; 11, filter one; 12, filter two; 13, filter three; 14, filter four; 15, filter five; 16, PBS prism; 17, rotatory film; 18, light channel one; 19, female carrier; 20, embedded carrier. DETAILED DESCRIPTION

[0042] The utility model is further described in detail below in combination with the embodiments, and it should be understood that the directions or position relations indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" and the like in the specification are based on the directions or position relations shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and thus cannot be understood as limiting the utility model in a specific direction, structure and operation. Therefore, it cannot be understood as limiting the utility model.

[0043] As shown in Figures 1 to 3 The utility model discloses a small volume wavelength division multiplexing structure for six wavelength gas sensor, including carrier, wherein the carrier includes parent carrier 19 and embedded carrier 20, first mounting surface 1 and second mounting surface 2 are arranged on the parent carrier 19, and the embedded carrier 20 is embedded in the mounting groove arranged on the parent carrier 19, third mounting surface 3, fourth mounting surface 4 and fifth mounting surface 5 are arranged on the embedded carrier 20. The embedded carrier 20 can double the application wavelength, and meanwhile can adjust various angles of the carrier, realizes the function of combining waves, and ensures that the structure volume does not change too much. In addition, hollow space needs to be arranged in the carrier for the light path to pass through.

[0044] The first mounting surface 11 and the second mounting surface 2 are arranged front to back, and the embedded carrier 2018 is located between the first mounting surface 11 and the second mounting surface 2, and the third mounting surface 3 is located below the fourth mounting surface 4 and the fifth mounting surface 5. Among them, the first mounting surface 1 is provided with reflective film piece one 6, reflective film piece two 7 and light channel one 18, the second mounting surface 2 is provided with filter piece one 11, filter piece two 12 and light channel two, the third mounting surface 3 is provided with PBS prism 16, filter piece three 13 and filter piece four 14, and a passageway one 9 is reserved between the PBS prism 16 and the filter piece three 13, a passageway two 10 is reserved between the filter piece three 13 and the filter piece four 14, the fourth mounting surface 4 is provided with reflective film piece three 8, and the fifth mounting surface 5 is provided with light channel three, light channel four and light channel five, and the light channel three is provided with optical rotatory piece 17.

[0045] The PBS prism 16 is used for transmitting horizontal polarization light and reflecting vertical polarization light, and the optical rotatory piece 17 is used for rotating the horizontal polarization light into vertical polarization light.

[0046] The scheme is used for solving the situation that six wavelengths and narrow wavelength intervals cannot be combined by 45° filter piece. The six wavelengths and narrow wavelength intervals usually include the following wavelengths:

[0047] λ1-λ3 emission wavelengths: 1631.4mm (λ1), 1650.9nm (λ2), 1680.2nm (λ3) respectively;

[0048] λ4-λ6 emission wavelengths are 1566.2 nm (λ4), 1529.2 nm (λ5), and 1578.2 nm (λ6), respectively;

[0049] Among the above wavelengths, the wavelength interval in λ1-λ3 is less than 40 nm, and the wavelength interval in λ4-λ6 is less than 40 nm.

[0050] It should also be known that most of the optical paths on the market are horizontally polarized states. In actual operation, a horizontally polarized light emitting laser can also be selected, so that the emitted optical path is a horizontally polarized state, that is, λ1-λ6 emission wavelengths are all horizontally polarized light.

[0051] The filter one 11 transmits light of a wavelength of 1631.4 nm and reflects light of other wavelengths.

[0052] The filter two 12 transmits light of a wavelength of 1650.9 nm and reflects light of other wavelengths.

[0053] The filter three 13 reflects light of a wavelength of 1529.2 nm and transmits light of other wavelengths.

[0054] The filter four 14 reflects light of a wavelength of 1578.2 nm and transmits light of other wavelengths.

[0055] Hereinafter, referring to Figure 4 and Figure 6 , the route of λ1-λ3 emission wavelengths in the wavelength division multiplexing structure is described.

[0056] λ1 working optical path principle: horizontally polarized light incident from the filter one 11 is transmitted through the filter one 11 and the PBS prism 16 in turn to reach the light channel one 18 and is output.

[0057] λ2 working optical path principle: horizontally polarized light incident from the filter two 12 is transmitted through the filter two 12 and the filter three 13 in turn to reach the reflecting film two 7, is reflected by the reflecting film two 7, passes through the passage one 9 to reach the filter one 11, is reflected by the filter one 11 to reach the PBS prism 16, is transmitted by the PBS prism 16 to reach the light channel one 18, and is output.

[0058] λ3 working optical path principle: horizontally polarized light incident from the light channel two is transmitted by the filter four 14 to reach the reflecting film one 6, is reflected by the reflecting film one 6, passes through the passage two 10 to reach the filter two 12, is reflected by the filter two 12 to reach the filter three 13, is transmitted by the filter three 13 to reach the reflecting film two 7, is reflected by the reflecting film two 7, passes through the passage one 9 to reach the filter one 11, is reflected by the filter one 11 to reach the PBS prism 16, is transmitted by the PBS prism 16 to reach the light channel one 18, and is output.

[0059] Ideally, only λ3 light enters the second optical channel, but inevitably, some of the other stray light will also enter the second optical channel, interfering with the λ3 light and even other wavelengths in the wavelength division multiplexing structure. As a preferred embodiment, a filter 15 is installed at the second optical channel, which transmits light of 1680.2 nm wavelength and reflects light of other wavelengths, so that the stray light directed at the second optical channel cannot be transmitted, and only light of 1680.2 nm (λ3) wavelength can be transmitted.

[0060] The following describes the route of λ4-λ6 emission wavelengths in the wavelength division multiplexing structure with reference to Figure 5 and Figure 6 .

[0061] λ4 working light path principle: horizontally polarized light incident from the third optical channel is rotated into vertically polarized light by the polarizer 17, reaches the reflective film 8, is reflected by the reflective film 8, reaches the PBS prism 16, is reflected by the PBS prism 16, reaches the first optical channel 18, and is output.

[0062] λ5 working light path principle: horizontally polarized light incident from the fourth optical channel is reflected by the reflective film 8, reaches the filter 13, is reflected by the filter 13, reaches the reflective film 2, is reflected by the reflective film 2, passes through the passage 9, reaches the filter 11, is reflected by the filter 11, reaches the PBS prism 16, is transmitted by the PBS prism 16, reaches the first optical channel 18, and is output.

[0063] λ6 working light path principle: horizontally polarized light incident from the fifth optical channel is reflected by the reflective film 8, reaches the filter 14, is reflected by the filter 14, reaches the reflective film 1, is reflected by the reflective film 1, passes through the passage 10, reaches the filter 12, is reflected by the filter 12, reaches the filter 13, is transmitted by the filter 13, reaches the reflective film 2, is reflected by the reflective film 2, passes through the passage 9, reaches the filter 11, is reflected by the filter 11, reaches the PBS prism 16, is transmitted by the PBS prism 16, reaches the first optical channel 18, and is output.

[0064] Generally, the reflective film 8 is a whole piece, but the reflective film 8 corresponds to three optical channels on the right side, the PBS prism 16 and two filters on the lower side, and it is not convenient to adjust the angle flexibly when installing and matching. As a preferred embodiment, the reflective film 8 includes three independent reflective films, so that the three reflective films can correspond to the filter 13, the filter 14, and the filter 15 one by one, facilitating the matching and adjustment of the angle.

[0065] In addition, the carrier of the embodiment adopts the form of a metal support to replace the existing glass block design structure, thereby reducing cost and improving production efficiency.

[0066] The above embodiments are only used for explaining the concept of the utility model, and are not limited to the protection of the utility model, and any non-essential changes to the utility model using the concept shall fall within the protection scope of the utility model.

Claims

1. A small volume wavelength division multiplexing structure for a six wavelength gas sensor comprising a carrier, characterized in that, The carrier comprises first to fifth installation surfaces, and a hollow space is arranged in the carrier for a light path to pass through; the first installation surface is provided with a reflecting film sheet one, a reflecting film sheet two and a light channel one, the second installation surface is provided with a filter sheet one, a filter sheet two and a light channel two, the third installation surface is provided with a PBS prism, a filter sheet three and a filter sheet four, a passage one is reserved between the PBS prism and the filter sheet three, and a passage two is reserved between the filter sheet three and the filter sheet four, the fourth installation surface is provided with a reflecting film sheet three, and the fifth installation surface is provided with a light channel three, a light channel four and a light channel five, and a rotatory film sheet is arranged in the light channel three; The PBS prism is used for transmitting horizontal polarized light and reflecting vertical polarized light; and the rotatory film sheet is used for rotating the horizontal polarized light into the vertical polarized light; Horizontal polarized light incident from the filter sheet one is transmitted through the filter sheet one and the PBS prism in sequence to reach the light channel one and is outputted; Horizontal polarized light incident from the filter sheet two is transmitted through the filter sheet two and the filter sheet three in sequence to reach the reflecting film sheet two, is reflected by the reflecting film sheet two, passes through the passage one to reach the filter sheet one, is reflected by the filter sheet one to reach the PBS prism, is transmitted by the PBS prism to reach the light channel one and is outputted; Horizontal polarized light incident from the light channel two is transmitted by the filter sheet four to reach the reflecting film sheet one, is reflected by the reflecting film sheet one, passes through the passage two to reach the filter sheet two, is reflected by the filter sheet two to reach the filter sheet three, is transmitted by the filter sheet three to reach the reflecting film sheet two, is reflected by the reflecting film sheet two, passes through the passage one to reach the filter sheet one, is reflected by the filter sheet one to reach the PBS prism, is transmitted by the PBS prism to reach the light channel one and is outputted; Horizontal polarized light incident from the light channel three is rotated into vertical polarized light by the rotatory film sheet, is reflected by the reflecting film sheet three to reach the PBS prism, is reflected by the PBS prism to reach the light channel one and is outputted; Horizontal polarized light incident from the light channel four is reflected by the reflecting film sheet three to reach the filter sheet three, is reflected by the filter sheet three to reach the reflecting film sheet two, is reflected by the reflecting film sheet two, passes through the passage one to reach the filter sheet one, is reflected by the filter sheet one to reach the PBS prism, is transmitted by the PBS prism to reach the light channel one and is outputted; Horizontal polarized light incident from the light channel five is reflected by the reflecting film sheet three to reach the filter sheet four, is reflected by the filter sheet four to reach the reflecting film sheet one, is reflected by the reflecting film sheet one, passes through the passage two to reach the filter sheet two, is reflected by the filter sheet two to reach the filter sheet three, is transmitted by the filter sheet three to reach the reflecting film sheet two, is reflected by the reflecting film sheet two, passes through the passage one to reach the filter sheet one, is reflected by the filter sheet one to reach the PBS prism, is transmitted by the PBS prism to reach the light channel one and is outputted.

2. A compact wavelength division multiplexing structure for a six-wavelength gas sensor according to claim 1, wherein, The light channel two is provided with a filter sheet five for transmitting one of the lights incident into the light channel two.

3. A compact wavelength division multiplexing structure for a six-wavelength gas sensor according to claim 1, wherein, The carrier comprises a mother carrier and an embedded carrier, the first installation surface and the second installation surface are arranged on the mother carrier, and the embedded carrier is embedded into an installation groove arranged on the mother carrier, and the third installation surface, the fourth installation surface and the fifth installation surface are arranged on the embedded carrier.

4. A compact wavelength division multiplexing structure for a six-wavelength gas sensor according to claim 1, wherein, The third reflecting film piece comprises three independent reflecting film pieces, and the three reflecting film pieces correspond to the third filter piece, the fourth filter piece and the fifth filter piece respectively.

5. The small-size wavelength division multiplexing structure for six-wavelength gas sensor according to claim 2, characterized in that: The first filter piece transmits light with a wavelength of 1631.4 nm and reflects light with other wavelengths; The second filter piece transmits light with a wavelength of 1650.9 nm and reflects light with other wavelengths; The third filter piece reflects light with a wavelength of 1529.2 nm and transmits light with other wavelengths; The fourth filter piece reflects light with a wavelength of 1578.2 nm and transmits light with other wavelengths; The fifth filter piece transmits light with a wavelength of 1680.2 nm and reflects light with other wavelengths.

6. A compact wavelength division multiplexing structure for a six-wavelength gas sensor according to claim 1, wherein, The carrier adopts a metal support.

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