WO2013060028A1

WO2013060028A1 - Multiplexer for spectrum monitoring system and spectrum monitoring system thereof

Info

Publication number: WO2013060028A1
Application number: PCT/CN2011/081526
Authority: WO
Inventors: 范顺杰; 孟显涛
Original assignee: 西门子公司
Priority date: 2011-10-28
Filing date: 2011-10-28
Publication date: 2013-05-02

Abstract

Provided is a multiplexer for a spectrum monitoring system, including a first disc (110), a second disc (120), and a third disc (130). The first disc is provided with a first light source channel (112) and a plurality of first return light channels (114). The second disc is provided with a plurality of second light source channels (122) and a plurality of second return light channels (124). The third disc is provided with a third light source channel (132) and a third return light channel (134). The third disc can move relative to the first disc and the second disc. When the third light source channel aligns with the locations of the second light source channels simultaneously, the third return light channel can align with the second return light channels and the first return light channels simultaneously. In a multi-probe (60) monitoring system, the intensity of the required light source (80) can be reduced, the number of spectrometers (90) can be reduced, and the errors and losses of the multiplexer caused by optical path switching can be avoided.

Description

Multiplexer of spectrum monitoring system and its spectrum monitoring system

The present invention relates to a multiplexer, and more particularly to a multiplexer for a spectral monitoring system for connecting each production unit (ie, a photobioreactor for algae cultivation) in large scale algae cultivation, and using the multiplexer Spectral monitoring system. Background technique

At present, the global energy crisis and environmental problems are becoming more and more serious, and large-scale algae cultivation and processing is considered to be an effective measure to solve these problems. In the process of algae cultivation, the concentration of nutrients plays a very important role in controlling the growth rate of algae and the amount of oily products. By tracking the concentration of nutrients, it is possible to assess and control the algae cultivation process in the photobioreactor.

In the photobioreactor ("reactor") in which algae is cultured, the amount of nutrients is monitored by monitoring the near-infrared spectrum. A spectral monitoring system for monitoring near infrared spectroscopy includes a light source, a probe mounted in the reactor, a multiplexer, and a spectrometer. The probe includes an input fiber and an output fiber. The light source supplies a test beam to the probe through the input fiber. The probe transmits a sensing beam reflecting the nutrient content in the reactor to the multiplexer through the output fiber, and then the multiplexer passes the test fiber. The concentration of the nutrient in the reactor is obtained by sensing the beam to the spectrometer. Among them, the multiplexer has a routing function, so that the spectrometer can receive the sensing beam sensed from different reactor probes by switching between different optical paths.

A typical spectrometer can only analyze the beam signal sensed by one probe at a time, while a multichannel spectrometer can simultaneously analyze the beam signals sensed by multiple probes, but it is expensive and the number of channels is very limited. The industrial cultivation of algae usually requires a large number of reactors. If one or several reactors are equipped with an expensive multi-channel spectrometer, this alone will greatly increase the funding requirements of the monitoring equipment.

At the same time, each probe requires a light source to provide a test beam, so the source needs to output a certain amount of power to each probe. Limited by the output power of the light source, the spectral monitoring system can only support a small number of probes, limiting the number of reactors that the spectrum monitoring system can monitor.

In addition, the multiplexer relies on the relative motion of the mechanical structure to realize the positioning of the internal optical path of the multiplexer, and the precision is low, and the multiplexer pulsates the connecting fiber during the switching optical path, which attenuates the beam signal and shortens the life of the fiber. Summary of the invention

The object of the present invention is to provide a multiplexer of a spectrum monitoring system and a spectrum monitoring system using the multiplexer, to reduce the intensity of the light source in the spectroscopy system, reduce the number of spectrometers used, and avoid the use of the multiplexer. Errors and losses caused by the switching of optical paths of mechanical contacts.

The present invention provides a multiplexer for a spectral monitoring system for a spectral monitoring system having a plurality of probes, the multiplexer including a first disc, a second disc, and a third disc. The first disc is provided with a first light source channel and a plurality of first light return channels. The second disc is parallel to the first disc, and is provided with a plurality of second light source channels and a plurality of second light return channels respectively having the same number as the first light return channels, and each of the second return optical channels is perpendicular to the first A disc is aligned with each of the first return channels in the direction of the disc. The third disc is located between the first disc and the second disc, and is parallel to the two and movable relative to the two, and is provided with a third light source channel and a third light return channel, in the third Disc The third return optical channel is simultaneously aligned with the second return optical channel and the first return optical channel when moving relative to the first disc and the second disc to a position where the third light source channel is aligned with the second light source channel.

In still another illustrative embodiment of the multiplexer of the spectrum monitoring system, wherein the first disc, the second disc, and the third disc are axially disposed along a same axis, and the first disc and the first disc There is no relative movement between the two discs, and the third disc is rotatable about the axis; the first light source passage is disposed at the intersection of the axis and the first disc, and the first return passage is evenly distributed at one intersection a second circumference of the center; the second return path is evenly distributed on a second circumference centered on the intersection of the axis and the second disc, and the second circumference has the same radius as the first circumference; The channels are evenly distributed on a third circumference centered on the intersection of the axis and the second disc; the third source channel includes a prism and a light transmission hole, and the light beam emitted through the first light source channel can be transmitted from one end of the prism to The other end of the prism is transmitted from the light transmission hole to a second light source channel.

In another illustrative embodiment of the multiplexer of the spectrum monitoring system, the second disc is mounted toward the end face of the first disc with an actuator that drives the rotation of the third disc.

In still another exemplary embodiment of the multiplexer of the spectrum monitoring system, the multiplexer further includes a fourth disc disposed coaxially with each of the discs, and is disposed on the third disc and the third disc Between the two discs and parallel to the two; the fourth disc is provided with a plurality of fourth light source channels and a plurality of fourth light return channels respectively having the same number as the first light return channels, and the fourth light source channel and the fourth The two light source channels correspond to each other, and the fourth light return channel corresponds to the second light return channel.

In still another exemplary embodiment of the multiplexer of the spectrum monitoring system, each of the fourth light source channels and the corresponding second light source channels, the fourth light return channels, and the corresponding second return light channels are respectively connected by an optical fiber. .

In a further illustrative embodiment of the multiplexer of the spectral monitoring system, a converging lens is provided in each of the first return channel and the fourth source channel. In addition, a collimating lens may also be disposed in each of the first light source channel and the fourth light return channel.

In still another exemplary embodiment of the multiplexer of the spectrum monitoring system, the first disc, the second disc, and the fourth disc are respectively provided with a plurality of connecting holes, and the multiplexer is further provided. There are a plurality of connecting members, and the connecting member can be disposed in the connecting hole, and the first disc, the fourth disc and the second disc are sequentially connected via a connecting member that is disposed in the connecting hole. In addition, the multiplexer discs can also be placed in a shielded enclosure.

The present invention also provides a spectrum monitoring system, comprising: the multiplexer of the present invention, a light source optically coupled to a first light source channel of the multiplexer, and a first return light to each multiplexer a spectrometer capable of connecting an optical signal to the channel, a plurality of probes optically connected to the second optical path of each multiplexer, and each of the probes is optically responsive via a second optical source channel corresponding to the input optical fiber and the multiplexer The connection is further optically connected to the second return optical channel corresponding to the multiplexer via an output optical fiber.

In still another illustrative embodiment of the spectroscopic monitoring system, the spectrometer is coupled to each of the first return channels of the multiplexer by a multi-furcated optical fiber.

By using the multiplexer of the invention, it is not necessary to separately equip each probe with a light source and/or a spectrometer, and only one light source and one spectrometer can perform separate measurement of multiple probes, and the optical fiber of the multiplexer optical path is switched. The mechanical loss is greatly reduced, thereby ensuring the measurement accuracy of the probe and the service life of the multiplexer, thereby improving the measurement accuracy and service life of the spectrum monitoring system. DRAWINGS

The following drawings are only illustrative of the invention and are not intended to limit the scope of the invention.

Figure 1 is a schematic illustration of an exemplary embodiment of a multiplexer for a spectral monitoring system. Figure 2 is a diagram showing another illustrative embodiment of a multiplexer of a spectrum monitoring system.

3 is a schematic structural view of an exemplary embodiment of a spectrum monitoring system.

Label description

100, 200 multiplexer

110, 210 first disc

111 first circumference

112, 212 first light source channel

114, 214 first light channel

120, 220 second disc

121 second circumference

122, 222 second light source channel

124, 224 second return channel

130, 230 third disc

131 third circumference

132, 232 third light source channel

133 light transmission hole

134, 234 third light channel

136 prism

160, 260 axis

226 Actuator

240 fourth disc

242 fourth light source channel

244 fourth light channel

256 connectors

258 shielded housing

52 input fiber

54 output fiber

60 probe

70 reactor

80 light source

90 spectrometer.

The above-described features, technical features, advantages and implementations of the multiplexer of the spectral monitoring system and its spectral monitoring system will be further described below in a clear and understandable manner with reference to the accompanying drawings. detailed description

For a better understanding of the technical features, objects and advantages of the present invention, the specific embodiments of the present invention are described with reference to the accompanying drawings.

In order to make the drawings concise, only the parts related to the present invention are schematically shown in the drawings, and they do not represent the actual structure of the product. In addition, in order to make the drawings simple and easy to understand, components having the same structure or function in some of the figures are only schematically illustrated, or only one of them is marked. In this article, "one" means not only "only this one", but also "more than one". The terms "first", "second", "third" and "fourth" in this document are used only to distinguish the same components, and are not intended to illustrate their mutual positional relationship and/or their importance.

Figure 1 is a diagram illustrating an illustrative embodiment of a multiplexer for a spectral monitoring system. As shown, the multiplexer 100 of the spectrum monitoring system includes a first disc 110, a second disc 120 and a third disc 130. In the exemplary embodiment of FIG. 1, it is assumed that the multiplexer 100 is adapted to connect six probes 60 (only two are schematically illustrated in the figure) for the sake of simplicity of the drawing, but the actual number of probes 60 may be different according to different occasions. It is different. The first disc 110 is provided with a first light source channel 112 and six first light return channels 114. The first source channel 112 is used to deliver the test beam from the source 80 of the spectroscopic monitoring system, and the first return channel 114 is used to receive the sensed beams from each probe back and pass the beams to the spectrometer 90.

The second disc 120 is disposed parallel to the first disc 110, and is provided with six second light source channels 122 and six second light return channels 124 respectively in the same number as the first return light passages 114, perpendicular to the first In the direction of a disc 110, the first return optical passages 114 are simultaneously aligned with the second return optical passages 124, respectively, to ensure that the sensing beam from the probe 60 can smoothly pass through the first returning optical passage 114 and the second returning light. Channel 124, to avoid loss of the sensing beam.

The third disc 130 is located between the first disc 110 and the second disc 120 and is parallel to the first disc 110 and the second disc 120 and is movable relative to both. The third disc 130 is provided with a third light source channel 132 and a third light return channel 134. The third disc 130 is moved relative to the first disc 110 and the second disc 120 to a third source. When the channel 132 is aligned with the position of the second light source channel 122, the third return path 134 is simultaneously aligned with the second return channel 124 and the first return channel 114.

The test beam emitted by the light source 80 passes through the first light source channel 112 to the third light source channel 132 of the third disc 130, and then the second light source of the second disc 120, in the direction indicated by the solid arrow in FIG. Channel 122 is delivered to input fiber 52 of a probe 60. After the probe 60 is sensitized, the sensing beam passes through the output fiber 54 of the probe 60, sequentially from the second return channel 124, the third return channel 134, and the first return channel 114, which are aligned with each other, by the fiber input spectrometer. 90, thereby achieving measurement of a probe.

With the movement of the third disc 130, when the third disc 130 is moved to another position, the third light source passage 132 and the third return light passage 134 are moved to the position shown by the broken line in the figure, at which time the light source 80 emits The test beam is transmitted in the direction indicated by the two-dot chain line in FIG. 1, that is, the test beam passes through the first light source channel 112 to the third light source channel 132 of the third disk 130, and the other of the second disk 120 The second source channel 122 is delivered to the input fiber 52 of the other probe 60. After the probe 60 is sensitized, the sensing beam passes through the output beam 54 of the probe 60, sequentially from the other second return channel 124, the third return channel 134, and the other first return channel 114 that are aligned with each other. The spectrometer 90 is input by the optical fiber to achieve measurement of the other probe.

It can be seen that with the multiplexer of the present invention, it is not necessary to separately equip the plurality of probes 60 with the light source 80 and/or the spectrometer 90, and only one light source 80 and one spectrometer 90 can complete the multiple probes. Measured separately. When the multiplexer implements switching between channels, the fiber does not move, and signal attenuation and mechanical loss are greatly reduced.

In an exemplary embodiment of the multiplexer, the first disc 110, the second disc 120, and the third disc 130 are all disposed axially along an axis 160, and the first disc 110 and the second disc There is no relative motion between 120, and the third disc 130 is rotatable about the axis 160. At this time, the first light source channel 112 is disposed at an intersection of the axis 160 and the first disk 110, and the first light return channel 114 is uniformly disposed on a first circumference 111 centered on the intersection; the second light return channel 124 Uniformly on a second circumference 121 centered at the intersection of the axis 160 and the second disc 120, and the second circumference 121 has the same radius as the first circumference 111; the second source channels 122 are evenly distributed in one axis 160 and second disc 120 The intersection of the third light source channel 132 includes a prism 136 and a light transmission hole 133. The light beam emitted from the first light source channel 112 can be transmitted from one end of the prism 136 to the other end of the prism 136. Then, the light transmission hole 133 is transmitted to a second light source passage 122. Although in the illustrated embodiment, the radius of the third circumference 131 is smaller than the radius of the second circumference 121, the radius of the third circumference 131 may be greater than the radius of the second circumference 121.

When the third disc 130 is rotated relative to the first disc 110 and the second disc 120, if the third light source channel 132 on the third disc 130 is rotated to a second light source channel 122 of the second disc 120 In the aligned position, the third return path 134 of the third disc 130 and a second return path 124 of the second disc 120 are aligned with each other in a direction perpendicular to the first disc 110. The test beam emitted by the light source 80 of the spectrum monitoring system is sequentially transmitted to the probe 60 through the first source channel 112, the third source channel 132 and the second source channel 122 of the first disc 110, and is sensed at the probe detection position. The beam, the sensing beam is sequentially passed through the second return channel 124 and the third return channel 134 aligned with each other, and the first return channel 114 is transmitted to the spectrometer 90 of the spectrum monitoring system, thereby completing a probe monitoring process. .

Although in the embodiment shown in FIG. 1, the three discs are all circular, the light source passage and the return light passage are respectively provided through the through holes on the discs, and the third disc is opposite to the first disc. The sheet and the second disc are rotated, but the three discs can also adopt other shapes; the light source passage and the return light passage can also adopt other forms of light guiding manner; and the relative movement of the third disc is not limited to rotation Other relative motion modes may be used, but when the third light source channel of the third disc transmits the test beam to the second light source channel of the second disc to a probe, the sensing beam from the probe must be The second return optical path of the two discs is transmitted to the spectrometer through the third return optical path of the third disc and the first return optical path.

The multiplexer of the spectrum monitoring system, the rotation of the third disc relative to the first disc and the second disc, so that only one probe can receive the test beam from the light source at the same time, and the probe returns the sensing The beam can be fed back to the spectrometer, and the rotation of the third disc allows the different probes to receive the test beam and return the sensing beam, respectively, thereby only setting up a single channel spectrometer to complete the operation of multiple algae reactors. Sensing, without the need to configure a spectrometer for each or a few probes, thereby reducing the number of spectrometers used in the spectroscopic monitoring system, greatly reducing the input cost of the entire spectrum monitoring system. The number of probes connected to the multiplexer can be adjusted by adjusting the rotational speed of the third disc and increasing the number of return channels and light source channels corresponding to the probe.

In addition, the source of the spectrum monitoring system only needs to provide a test beam to one probe at a time, which can greatly reduce the power requirements of the source. The relative movement between the first disc and the second disc does not occur, so that a high positioning accuracy can be achieved between the first disc and the second disc, thereby improving the light source channel and the return path provided thereon. The accuracy of the alignment is to avoid losses in the transmission of the test beam and the sense beam.

The multiplexer of the spectrum monitoring system can be used in various applications such as algae cultivation. The multi-channel of the spectrum monitoring system can also be applied to other places where optical path switching is required, and the monitoring device can realize near-infrared spectroscopy, ultraviolet spectroscopy, and visible spectroscopy. Or infrared spectroscopy and other tests.

In the exemplary embodiment shown in FIG. 1, the first light source channel 112 is disposed at the center of the first disk 110, and the test beam transmitted by the first light source channel 112 is passed through a third disk 130. The third light source channel transmits the light beam to the light transmission hole 133 through a prism 136, but the prism therein can also transmit the test light beam from the first light source channel to the light transmission hole 133, such as a mirror or the like, in other forms. The prism can use two prisms or a diamond prism.

As shown in FIG. 1 , the radius of the third return channel 134 is greater than the radius of the second return channel 124 and the first return channel 114 to prevent the third disc 130 from blocking the sensing beam, and the Three-disc 130 motion positioning accuracy Strict requirements.

Figure 2 is a diagram showing another illustrative embodiment of a multiplexer of a spectrum monitoring system. The same structure of the multiplexer 200 of the spectrum monitoring system and the multiplexer 100 will not be described again. As shown in FIG. 2, the second disc 220 is mounted with an actuator 226 on the end surface of the first disc 210. The actuator 226 can drive the third disc 230 relative to the first disc 210 and the second disc. 220 rotates about axis 260. In one embodiment of the multiplexer of the spectrum monitoring system, the actuator is a drive motor.

Since the driving motor 226 is mounted on the second disc 220, the spacing between the second disc 220 and the third disc 230 is increased, so that a fourth disc 240 is further disposed in the multiplexer 200. It is disposed between the third disc 230 and the second disc 220, and the fourth disc 240 is parallel to the first disc 210, and is coupled to the first disc 210, the second disc 220, and the third disc 230. Have the same axis 260. The fourth disc 240 is provided with six fourth light source through holes 242 and six fourth return light passages 244 respectively having the same number as the first return light passages 214, and the fourth light source passages 242 and the fourth return light passages 244. The number is the same as the number of probes. The fourth light source channel 242 corresponds to the second light source channel 222, and the fourth light return channel 244 corresponds to the second light return channel 224.

In a preferred embodiment, each of the fourth light source channels 242 and the corresponding second light source channels 222, the fourth light return channels 244 and the corresponding second light return channels 224 are perpendicular to the first disk 210. Align in direction. In addition, each of the fourth light source channels 242 and the corresponding second light source channels 222, the fourth light return channels 244 and the corresponding second light return channels 224 may be respectively connected by optical fibers. For example, it can be directly connected to the input fiber 52 and the output fiber 54 of each probe 60. When the test beam is transmitted, the test beams are transmitted from the fourth source channel 242 on the fourth disc 240 through the input fiber 52 to the second source channel 222 connected to the fourth source channel 242; when the sensing beam is transmitted The sensing beams are transmitted from the second return path 224 on the second disc 220 through the output fiber 54 to the fourth return path 244 that is aligned with the second return path 224. If these test and sense beams are transmitted directly in the air, a large loss will result, and the loss of the test beam and the sense beam can be greatly reduced by the input fiber 52 and the output fiber 54. At the same time, the input optical fiber 52 and the output optical fiber 54 are fixed between the second disc 220 and the fourth disc 240. During the operation of the multiplexer, the fourth disc 240 and the second disc 220 do not move, thereby avoiding The input fiber 52 and the output fiber 54 lose the light beam transmitted therein due to the force deformation, and the service life of the input fiber 52 and the output fiber 54 can be extended.

As shown in FIG. 2, a plurality of connection holes (not shown) are respectively disposed on the first disc 210, the second disc 220, and the fourth disc 240, and the multiplexer is further provided with a plurality of connecting members. 256. In the direction perpendicular to the first disc 210, the connecting holes are aligned with each other, and the connecting member 256 can be disposed in the connecting holes, and the first disc 210, the second disc 220 and the fourth disc 240 are worn through The connectors 256 provided in the connection holes enable interconnection and positioning.

In an embodiment of the multiplexer of the spectrum monitoring system, one of the first light return channel 214 and the fourth light source channel 242 is respectively provided with a converging lens, and the first light source channel 212 and the fourth light return channel 244 are provided. There is a collimating lens through which the loss of the sensing and test beams can be reduced.

As shown in FIG. 2, the multiplexer of the spectrum monitoring system is further provided with a shielding casing 258, and the first disc 210, the second disc 220 and the third disc 230 are disposed therein to avoid stray light in the environment. The interference of the beam and the sensing beam.

Figure 3 shows a spectrum monitoring system using the multiplexer of the present invention. As shown in FIG. 3, the spectrum monitoring system includes a multiplexer 100, a light source 80 optically coupled to the light source channel of the multiplexer, and a spectrometer 90 and a plurality of optical signals connected to the return channel of the multiplexer. The probes 60, each of which is optically coupled to the multiplexer via an input fiber 52 and an output fiber 54 respectively. Thereby, the state in each of the reactors 70 provided with the probe 60 is measured, for example, in the algae culture, that is, the content of the nutrient in each reactor 70 can be monitored. In an exemplary embodiment of the spectral monitoring system, the spectrometer is coupled to each of the first return channels of the multiplexer by a multi-furcated optical fiber.

In this document, "schematic" means "serving as an example, instance or description" and any illustration or embodiment described herein as "schematic" should not be construed as a more preferred or advantageous. Technical solutions.

It should be understood that, although the description has been described in terms of various embodiments, the embodiments are not intended to be limited to a single technical solution. The description of the specification is merely for the sake of clarity, and those skilled in the art should The technical solutions in the embodiments may also be combined as appropriate to form other embodiments that can be understood by those skilled in the art.

The detailed description of the preferred embodiments of the present invention is not intended to limit the scope of the present invention. Changes are intended to be included within the scope of the invention.

Claims

Claim

1. A multiplexer (100, 200) of a spectral monitoring system for a spectral monitoring system having a plurality of probes (60), the multiplexer (100, 200) comprising:

a first disc (110, 210) including a first light source channel (112, 212) and a plurality of first light return channels (114, 214);

a second disc (120, 220) parallel to the first disc (110, 210), and the second disc (120, 220) is respectively provided with the first return optical passage ( 114, 214) a plurality of second light source channels (122, 222) and a plurality of second light return channels (124, 224) of the same number, each of the second light return channels (124, 224) being perpendicular to the The first disc (110, 210) is aligned with each of the first return channels (114, 214); and

a third disc (130, 230) located between the first disc (110, 210) and the second disc (120, 220), and parallel to both and relative to the two Moving, the third disc (130, 230) is provided with a third light source channel (132) and a third light return channel (134) channel, wherein the third disc (130, 230) is opposite to the first When a disc (110, 210) and the second disc (120, 220) are moved to a position where the third source channel (132, 232) is aligned with the second source channel (122), The third return channel (134, 234) is simultaneously aligned with the second return channel (124, 224) and the first return channel (114, 214).

2. The multiplexer (100, 200) of claim 1 wherein:

The first disc (110, 210), the second disc (120, 220) and the third disc (130, 230) are all axially disposed along an axis (160, 260), and There is no relative movement between the first disc and the second disc, and the third disc is rotatable about the axis (160, 260);

The first light source channel (112, 212) is disposed at an intersection of the axis (160, 260) and the first disk (110, 210), and the first light return channel (114, 214) is Laying on a first circumference (111) centered on the intersection; the second return passages (124, 224) are evenly distributed on the shaft (160, 260) and the second disc ( 120, 220) is the intersection of the second circumference (121) of the center, and the second circumference (121) has the same radius as the first circumference (111);

The second light source channels (122, 222) are evenly distributed on a third circumference (131) centered on the intersection of the axis (160, 260) and the second disk (120, 220);

The third light source channel (132, 232) includes a prism (136) and a light transmission hole (133), and a light beam emitted through the first light source channel (112, 212) can be one end of the prism (136) The other end of the prism (136) is transmitted to the second light source channel (122, 222) by the light transmission hole (133).

3. The multiplexer (200) according to claim 2, wherein said second disc (220) is mounted with an actuator (226) on an end face of said first disc (210), said The actuator (226) can drive the rotation of the third disc (230).

4. The multiplexer (200) according to claim 3, further comprising a fourth disc (240) disposed coaxially with the axis (260), disposed on the third disc ( 230) and the second disc (220) are parallel to the two; the fourth disc (240) is provided with a plurality of fourth light sources respectively having the same number as the first return optical passages (214) a channel (242) and a plurality of fourth light return channels (244), wherein the fourth light source channel (242) corresponds to the second light source channel (222), and the fourth light return channel (244) is The second return light channels (224) correspond to each other.

5. The multiplexer (200) according to claim 4, wherein each of the fourth light source channels (242) and the corresponding second light source channels (222), each of the fourth light return channels (244) And the corresponding second return optical channel (224) is respectively connected by an optical fiber.

6. The multiplexer (200) according to claim 4, wherein a converging lens is disposed in each of the first light return channel (214) and the fourth light source channel (242).

7. The multiplexer (200) according to claim 4, wherein said first disc (210), said second disc (220) and said fourth disc (240) are respectively provided There are a plurality of connecting holes, and the multiplexer (200) is further provided with a plurality of connecting members (256), and the connecting member (256) can be disposed in the connecting holes, the first disc ( 210), the fourth disc (240) and the second disc (220) are sequentially connected via a connecting member (256) that is disposed in the connecting hole.

8. The multiplexer (200) according to claim 1, wherein said first disc (210), said second disc (220) and said third disc (230) are disposed in a shield In the outer casing (258).

9. The multiplexer (200) according to claim 1, wherein a first collimating lens is disposed in each of the first light source channel (212) and the fourth light return channel (244).

10. A spectral monitoring system comprising:

A multiplexer (100, 200) according to any one of claims 1 to 9;

a light source (80) optically coupled to the first light source channel (112, 212) of the multiplexer;

a spectrometer (90) optically coupled to each of the first return channels (114, 214) of the multiplexer; and a plurality of probes (60), each of the probes (60) respectively The input light fiber (52) and the second light source channel (122, 222) corresponding to the multiplexer (100, 200) are optically connectable, and respectively connected to the multiplexer via an output fiber (54) (100, 200) The corresponding second return channel (124, 224) can be optically connected.

11. The multiplexer of claim 10, wherein said spectrometer (90) is coupled to each of said first return channels (114, 214) of said multiplexer by a multi-branch fiber.