Analyzing device and analyzing method for absorption spectra

Abstract

The application provides an analysis device and an analysis method for sample absorption spectrum, wherein the analysis device comprises: a light source unit for emitting a first light beam and a second light beam; a measuring cavity unit for placing a sample; a multiplexing unit for receiving the first light beam carrying sample information and the second light beam carrying light source information through mechanical movement; a control unit for receiving the first light beam and the second light beam passing through the multiplexing unit respectively, and converting the light signal of the first light beam into a first electric signal and converting the light signal of the second light beam into a second electric signal; and an analysis unit for obtaining the absorption spectrum of the sample based on the first electric signal and the second electric signal. In the above manner, the second light beam with light source information is obtained, and when the absorption spectrum of the sample is analyzed, the influence of the light source due to the weakening of the light source itself caused by the long use time can be eliminated, and a more accurate absorption spectrum of the sample is obtained.

Description

Technical Field

[0001] This invention relates to the field of spectroscopic analysis technology, and more particularly to analytical apparatus and methods for absorption spectroscopy. Background Technology

[0002] Spectroscopic analysis is a method of identifying substances and determining their chemical composition and relative abundance based on their spectra. It is an analytical method established on the spectroscopy of molecules and atoms. It involves three main processes: ① energy source provides energy; ② energy interacts with the analyte; ③ a detected signal is generated. There are many types of spectroscopic methods. Analytical methods based on the absorption of light by particles are called absorption spectroscopy, such as ultraviolet-visible absorption spectroscopy, infrared absorption spectroscopy, and atomic absorption spectroscopy. Analytical methods based on emission phenomena are called emission spectroscopy, such as atomic emission spectroscopy and fluorescence emission spectroscopy. Since the energy level distribution of atoms, ions, and molecules in different substances is characteristic, the energy of absorbed and emitted photons is also characteristic.

[0003] However, in various systems, the light source itself attenuates, and the light intensity will decrease after long-term use, leading to errors in the measurement results. Summary of the Invention

[0004] This invention provides an absorption spectrum analysis device and method to solve the defect of light intensity attenuation after long-term use of light sources in the prior art, and to achieve more accurate absorption spectrum detection.

[0005] This invention provides an analytical device for sample absorption spectroscopy, comprising: a light source unit for emitting a first light beam and a second light beam; wherein the first light beam is incident on a measurement cavity unit, and the second light beam is incident on a multiplexing unit; a measurement cavity unit for placing a sample, wherein the first light beam carries sample information after passing through the measurement cavity unit; a multiplexing unit for receiving the first light beam carrying sample information and the second light beam carrying light source information in a time-division manner by mechanical movement; a control unit for receiving the first light beam and the second light beam passing through the multiplexing unit respectively, and converting the optical signal of the first light beam into a first electrical signal and the optical signal of the second light beam into a second electrical signal; and an analysis unit for obtaining the absorption spectrum of the sample based on the first electrical signal and the second electrical signal.

[0006] According to the present invention, a sample absorption spectrum analysis device further includes a reflection unit; the first beam passes through the measurement cavity unit and reaches the reflection unit, the first beam is reflected and passes through the measurement cavity unit again, and finally enters the multiplexing unit.

[0007] According to the present invention, a sample absorption spectrum analysis device includes a multiplexing unit comprising a first collimating lens, a second collimating lens, a motor baffle, a first converging lens, and a second converging lens; wherein the first collimating lens is used to collimate a first light beam; the second collimating lens is used to collimate a second light beam; the first converging lens is used to receive the collimated first light beam; the second converging lens is used to receive the collimated second light beam; and the motor baffle is used to move so that the first converging lens receives the first light beam or the second converging lens receives the second light beam.

[0008] According to the present invention, a sample absorption spectrum analysis device includes a multiplexing unit comprising a first collimating lens, a second collimating lens, a motor, and a converging lens; wherein the first collimating lens is used to collimate a first light beam; the second collimating lens is used to collimate a second light beam; and the motor is used to drive the converging lens to move so that the first converging lens receives the first light beam or the second converging lens receives the second light beam.

[0009] According to the sample absorption spectrum analysis device provided by the present invention, the control unit is also used to control the movement of the motor baffle or the motor.

[0010] The sample absorption spectrum analysis device provided by the present invention further includes a dispersion unit; the dispersion unit is used to receive a first beam or a second beam emitted from the multiplexing unit and to perform spectral processing on the first beam or the second beam.

[0011] According to the present invention, a sample absorption spectrum analysis device is provided in which the light source unit and the multiplexing unit, the light source unit and the measurement cavity unit, the measurement cavity unit and the multiplexing unit, and the multiplexing unit and the control unit are respectively connected by optical fibers.

[0012] This invention also provides a method for analyzing the absorption spectrum of a sample, comprising: a light source unit emitting a first light beam and a second light beam, the second light beam being incident on a multiplexing unit; the first light beam being incident on the multiplexing unit after passing through a measurement cavity unit, wherein the measurement cavity unit holds a sample, and the first light beam carrying sample information after passing through the measurement cavity unit; the multiplexing unit receiving the first light beam carrying sample information and the second light beam carrying light source information in a time-division manner by mechanical movement; a control unit receiving the first light beam and the second light beam passing through the multiplexing unit respectively, and converting the optical signal of the first light beam into a first electrical signal and the optical signal of the second light beam into a second electrical signal; and an analysis unit obtaining the absorption spectrum of the sample based on the first and second electrical signals.

[0013] According to the present invention, a method for analyzing the absorption spectrum of a sample, wherein a first light beam passes through a measurement cavity unit and is then incident on a multiplexing unit, the method includes: the sample after the first light beam passes through the measurement cavity unit reaches a reflection unit, is reflected, and then passes through the measurement cavity unit again before being incident on the multiplexing unit.

[0014] According to the present invention, a method for analyzing sample absorption spectra, a multiplexing unit receives a first light beam carrying sample information and a second light beam carrying light source information in a time-division manner by mechanical movement, including: a control unit controlling a motor baffle or a motor to move, so that the multiplexing unit switches the optical path to receive light beams from different optical paths.

[0015] The present invention provides an analytical apparatus and method for analyzing sample absorption spectra. A light source unit emits a first beam and a second beam. The first beam is incident on a measurement cavity unit, and the second beam is incident on a multiplexing unit. The first beam carries sample information after passing through the measurement cavity unit. The multiplexing unit receives the first beam carrying sample information and the second beam carrying light source information. A control unit processes the optical signal into an electrical signal. The analysis unit obtains the sample's absorption spectrum based on the first and second electrical signals. Through this method, the present invention, by obtaining a second beam carrying light source information, can eliminate the influence of the weakening intensity of the light source due to prolonged use when analyzing the sample absorption spectrum, thus obtaining a more accurate sample absorption spectrum. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of an embodiment of the sample absorption spectrum analysis device of the present invention.

[0018] Figure 2 This is a schematic diagram of the structure of a multiplexing unit in an embodiment of the sample absorption spectrum analysis device of the present invention;

[0019] Figure 3 This is a schematic diagram of another embodiment of the multiplexing unit in the sample absorption spectrum analysis device of the present invention;

[0020] Figure 4 This is a schematic diagram of the structure of an embodiment of the sample absorption spectrum analysis device of the present invention;

[0021] Figure 5 This is a schematic flowchart of an embodiment of the sample absorption spectrum analysis method of the present invention. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0023] This invention provides an analytical apparatus for sample absorption spectra. Please refer to [link / reference]. Figure 1 , Figure 1 This is a schematic diagram of an embodiment of the sample absorption spectrum analysis device of the present invention. In this embodiment, the sample absorption spectrum analysis device 100 may include a light source unit 110, a measurement cavity unit 120, a multiplexing unit 130, a control unit 140, and an analysis unit 150.

[0024] Specifically, the light source unit 110 is used to emit a first beam and a second beam; wherein, the first beam is incident on the measurement cavity unit 120, and the second beam is incident on the multiplexing unit 130. Specifically, the beam emitted by the light source unit is a broadband beam, and the parameters of the first beam and the second beam are the same.

[0025] Optionally, a portion of the light source from the light source unit 11 is split into the multiplexing unit 130. In this example, an optical fiber method can be used to flexibly arrange the optical path, or a geometric optics system can be used for beam splitting.

[0026] The measurement cavity unit 120 is used to place the sample, wherein the first beam carries the sample information after passing through the measurement cavity unit 120.

[0027] The multiplexing unit 130 is used to receive, in a time-division manner, a first beam carrying sample information and a second beam carrying light source information through mechanical movement.

[0028] Optionally, the multiplexing unit 130 is a mechanical optical path switching device, used to switch the optical path by moving the internal mechanical structure, and to select in time division the illumination intensity of the first beam emitted from the measuring cavity unit 120 or the illumination intensity of the second beam emitted from the illumination unit.

[0029] The control unit 140 is configured to receive a first light beam and a second light beam passing through the multiplexing unit, respectively, and convert the optical signal of the first light beam into a first electrical signal and the optical signal of the second light beam into a second electrical signal. The control unit 140 can convert the optical signals into electrical signals, perform digital processing, and send them to the analysis unit 150 for processing.

[0030] The analysis unit 150 obtains the absorption spectrum of the sample based on the first electrical signal and the second electrical signal. Specifically, the analysis unit 150 can analyze, display, and store the first electrical signal and the second optical signal. The second electrical signal is removed from the first electrical signal, that is, the influence of the weakening intensity of the light source itself is eliminated.

[0031] Optionally, the light source unit 110 is connected to the multiplexing unit 130, the light source unit 110 is connected to the measurement cavity unit 120, the measurement cavity unit 120 is connected to the multiplexing unit 130, and the multiplexing unit 130 is connected to the control unit 140 via optical fibers; the control unit 140 is electrically connected to the analysis unit 150.

[0032] In this embodiment, the light source unit 110 can emit a first beam and a second beam, wherein the first beam can propagate along a first beam path, and the second beam can propagate along a second beam path. The first beam path starts from the light source unit 110, passes sequentially through the measurement cavity unit 120, the multiplexing unit 130, and the control unit 140; the second beam path starts from the light source unit 110, passes sequentially through the multiplexing unit 130 and the control unit 140. The multiplexing unit 130 can select whether the first beam path or the second beam path is activated by mechanical movement.

[0033] The sample absorption spectrum analysis device provided in this embodiment emits a first beam and a second beam from a light source unit. The first beam is incident on a measurement cavity unit, and the second beam is incident on a multiplexing unit. After passing through the measurement cavity unit, the first beam carries sample information. The multiplexing unit receives the first beam carrying sample information and the second beam carrying light source information. The control unit processes the optical signal into an electrical signal. The analysis unit obtains the sample's absorption spectrum based on the first and second electrical signals. Through this method, this embodiment obtains a second beam carrying light source information, which can eliminate the influence of the light source's weakening intensity due to prolonged use when analyzing the sample absorption spectrum, resulting in a more accurate sample absorption spectrum.

[0034] In some embodiments, the absorption spectroscopy analysis apparatus may further include a reflection unit; the first light beam passes through the measurement cavity unit and reaches the reflection unit, is reflected, passes through the measurement cavity unit again, and finally enters the multiplexing unit. By providing a reflection unit, the first light beam can pass through the measurement cavity unit, carrying sample information, before reaching the multiplexing unit.

[0035] Optionally, the measurement cavity unit is a semi-open container that allows the sample to flow in and the light beam to pass through the measurement cavity and illuminate the reflection unit. The sample can be a liquid or a gas. The reflection unit is a plane mirror or a pyramidal mirror, or a similar device.

[0036] In some embodiments, the multiplexing unit may include a first collimating lens, a second collimating lens, a motor baffle, a first converging lens, and a second converging lens. See also Figure 2 , Figure 2 This is a schematic diagram of the structure of a multiplexing unit in the sample absorption spectrum analysis device of the present invention.

[0037] In this embodiment, the first collimating lens 131 is used to collimate the first beam; the second collimating lens 132 is used to collimate the second beam; the first converging lens 134 is used to receive the collimated first beam; the second converging lens 135 is used to receive the collimated second beam; and the motor baffle 133 is used to move so that the first converging lens 134 receives the first beam or the second converging lens 135 receives the second beam.

[0038] The first collimating lens 131 is connected to the measurement cavity unit via an optical fiber, and the second collimating lens 132 is connected to the light source unit via an optical fiber. The first collimating lens 131 and the first converging lens 134, and the second collimating lens 132 and the second converging lens 135 are respectively connected by optical fibers. The first converging lens 134 and the second converging lens 135 are connected together via optical fibers, and then connected to the control unit.

[0039] Specifically, the motor baffle 133 can be moved to positions A and A'. When the motor baffle 133 is moved to position A, the first beam is blocked by the motor baffle 133 after passing through the first collimating lens 131, and the first converging lens 134 cannot receive the first beam. At this time, the second beam is received by the second converging lens 135 after passing through the second collimating lens 132, and the converged second beam exits from the multiplexing unit. When the motor baffle 133 is moved to position A', the first beam is received by the first converging lens 134 after passing through the first collimating lens 131, and the converged first beam exits from the multiplexing unit. The second beam is blocked by the motor baffle 133 after passing through the second collimating lens 132, and the second converging lens 135 cannot receive the second beam.

[0040] Therefore, when the motor baffle 133 moves to position A, the multiplexing unit receives and processes the second beam; when the motor baffle 133 moves to position A', the multiplexing unit receives and processes the first beam. In this way, the multiplexing unit can switch the optical path by moving its internal mechanical structure, and process the first beam and the second beam in a time-division multiplexing manner.

[0041] In some embodiments, the multiplexing unit may include a first collimating lens 131, a second collimating lens 132, a motor 133', and a converging lens. See also Figure 3 , Figure 3 This is a schematic diagram of another embodiment of the multiplexing unit in the sample absorption spectrum analysis device of the present invention.

[0042] In this embodiment, the first collimating lens 131 is used to collimate the first beam; the second collimating lens 132 is used to collimate the second beam; and the motor 133' is used to drive the converging lens 134' to move so that the first converging lens 134' receives the first beam or the second converging lens 134' receives the second beam.

[0043] The first collimating lens 131 is connected to the measurement cavity unit via an optical fiber, and the second collimating lens 132 is connected to the light source unit via an optical fiber. The first collimating lens 131 and the converging lens 134', and the second collimating lens 132 and the converging lens 134' are respectively connected by optical fibers. The converging lens 134' is connected to the control unit via an optical fiber.

[0044] Specifically, motor 133' drives converging lens 134' to move. When motor 133' drives converging lens 134' to a position that is the same as the optical path of the first collimating lens 131 (i.e., as shown in the image), Figure 3 In the state shown, the first beam of light passing through the first collimating lens 131 can smoothly enter the converging lens 134' and exit. At this time, the multiplexing unit processes the first beam of light. The second beam of light enters the second collimating lens 132 but cannot be converged by the converging lens 134' and therefore cannot exit. However, when the motor 133' moves the converging lens 134' to the same position as the optical path of the second collimating lens 132, the second beam of light can be processed. At this time, the first beam of light cannot be converged by the converging lens 134' and therefore cannot exit. Therefore, through the above method, the multiplexing unit can also realize the function of time-division detection of different optical paths.

[0045] It should be noted that, in addition to the above, the reuse unit also includes... Figure 2 and Figure 3 Besides the structure, it can also be other mechanical optical path conversion devices. They will not be listed here.

[0046] In some embodiments, the control unit of the sample absorption spectrum analysis device is also used to control the motor baffle or the movement of the motor.

[0047] In some embodiments, the sample absorption spectrum analysis device may further include a dispersion unit; the dispersion unit is used to receive the first beam or the second beam emitted from the multiplexing unit and to perform spectral processing on the first beam or the second beam.

[0048] In some embodiments, the sample absorption spectrum analysis device may further include a power supply unit; the power supply unit can supply power to the light source unit and the control unit, and control the switching of the light source unit.

[0049] The reflection unit, control unit, and dispersion unit in the above embodiments can be configured in the sample absorption spectrum analysis device according to actual conditions. Please refer to... Figure 4 , Figure 4 This is a schematic diagram of an embodiment of the sample absorption spectrum analysis device of the present invention. In this embodiment, the sample absorption spectrum analysis device 200 may include a light source unit 210, a measurement cavity unit 220, a multiplexing unit 230, a control unit 240, an analysis unit 250, a reflection unit 260, a dispersion unit 270, and a power supply unit 280.

[0050] The multiplexing unit 230 is connected to the measurement cavity unit 220, the light source unit 210 and the dispersion unit 270 via optical fibers, the reflection unit 260 is connected to the measurement cavity unit 220 via optical fibers, the dispersion unit 270 is connected to the control unit 240 via optical fibers, and the light source unit 210 is connected to the measurement cavity unit 220 via optical fibers.

[0051] The power supply unit 280 is electrically connected to the light source unit 210 and the control unit 240, respectively. The control unit 240 is electrically connected to the light source unit 210 and the analysis unit 250, respectively.

[0052] Based on the above-described sample absorption spectrum analysis apparatus, the present invention also provides a method for analyzing sample absorption spectra. Please refer to [link to relevant documentation]. Figure 5 , Figure 5 This is a schematic flowchart of an embodiment of the sample absorption spectrum analysis method of the present invention. In this embodiment, the sample absorption spectrum analysis method includes steps S110 to S150, and the specific steps are as follows:

[0053] S110: The light source unit emits a first beam and a second beam, and the second beam is incident on the multiplexing unit.

[0054] S120: The first beam passes through the measurement cavity unit and then enters the multiplexing unit.

[0055] The measurement cavity unit contains the sample, and the first beam carries the sample information after passing through the measurement cavity unit.

[0056] In some embodiments, the first beam passes through the sample of the measurement cavity unit to the reflection unit, is reflected, passes through the sample of the measurement cavity unit again, and then enters the multiplexing unit.

[0057] S130: The multiplexing unit receives, in a time-division manner, a first beam carrying sample information and a second beam carrying light source information through mechanical movement.

[0058] Please refer to the above embodiments for the specific structure of the multiplexing unit. Optionally, the control unit controls the movement of the motor baffle or the motor to enable the multiplexing unit to switch the optical path to receive beams from different optical paths.

[0059] S140: The control unit receives the first beam and the second beam passing through the multiplexing unit respectively, and converts the optical signal of the first beam into a first electrical signal and the optical signal of the second beam into a second electrical signal.

[0060] S150: Obtain the absorption spectrum of the sample based on the first and second electrical signals.

[0061] This invention provides an analytical apparatus and method for analyzing sample absorption spectra. The analytical apparatus includes: a light source unit for emitting a first light beam and a second light beam; a measurement cavity unit for placing the sample; a multiplexing unit for receiving, via mechanical movement, the first light beam carrying sample information and the second light beam carrying light source information in a time-division manner; a control unit for receiving the first light beam and the second light beam passing through the multiplexing unit respectively, and converting the optical signal of the first light beam into a first electrical signal and the optical signal of the second light beam into a second electrical signal; and an analysis unit for obtaining the absorption spectrum of the sample based on the first and second electrical signals. Through this method, by obtaining the second light beam carrying light source information, this invention can deduct the influence of the weakening intensity of the light source due to prolonged use when analyzing the sample absorption spectrum, thus obtaining a more accurate sample absorption spectrum.

[0062] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0063] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An apparatus for analyzing a sample absorption spectrum, characterized by, include: A light source unit for emitting a first beam and a second beam; wherein the first beam is incident on a measurement cavity unit and the second beam is incident on a multiplexing unit; The measurement cavity unit is used to place the sample, wherein the first light beam carries sample information after passing through the measurement cavity unit; The multiplexing unit is used to receive, in a time-division manner, a first beam carrying sample information and a second beam carrying light source information through mechanical movement. The control unit is configured to receive a first light beam and a second light beam passing through the multiplexing unit, respectively, and convert the optical signal of the first light beam into a first electrical signal and the optical signal of the second light beam into a second electrical signal; The analysis unit obtains the absorption spectrum of the sample based on the first electrical signal and the second electrical signal; It also includes a reflective unit; After passing through the measurement cavity unit, the first beam reaches the reflection unit. After being reflected, the first beam passes through the measurement cavity unit again and finally enters the multiplexing unit. The measurement cavity unit is a semi-open container that allows the sample to flow in and the light beam to pass through the measurement cavity unit and illuminate the reflection unit; the sample is a liquid or a gas. The multiplexing unit includes a first collimating lens, a second collimating lens, a motor baffle, a first converging lens, and a second converging lens; wherein, the first collimating lens is used to collimate the first beam; the second collimating lens is used to collimate the second beam; the first converging lens is used to receive the collimated first beam; the second converging lens is used to receive the collimated second beam; the motor baffle is used to move so that the first converging lens receives the first beam or the second converging lens receives the second beam; Alternatively, the multiplexing unit includes a first collimating lens, a second collimating lens, a motor, and a converging lens; wherein the first collimating lens is used to collimate the first beam; the second collimating lens is used to collimate the second beam; and the motor is used to drive the converging lens to move so that the first converging lens receives the first beam or the second converging lens receives the second beam. The control unit is also used to control the movement of the motor baffle or the motor; The light source unit is connected to the multiplexing unit, the light source unit is connected to the measurement cavity unit, the measurement cavity unit is connected to the multiplexing unit, and the multiplexing unit and the control unit are respectively connected via optical fibers.

2. The apparatus for analysis of a sample absorption spectrum according to claim 1, characterized in that, It also includes the dispersion unit; The dispersive unit is used to receive the first beam or the second beam emitted by the multiplexing unit and to perform beam splitting on the first beam or the second beam.

3. A method of analysis of a sample absorption spectrum, characterized by, Using the analytical apparatus for analyzing sample absorption spectra as described in claim 1 or 2, the method for analyzing sample absorption spectra includes: The light source unit emits a first beam and a second beam, and the second beam is incident on the multiplexing unit; The first beam passes through the measurement cavity unit and then enters the multiplexing unit, wherein the measurement cavity unit contains a sample, and the first beam carries sample information after passing through the measurement cavity unit; The multiplexing unit receives the first light beam carrying sample information and the second light beam carrying light source information in time by mechanical movement; The control unit receives the first light beam and the second light beam passing through the multiplexing unit respectively, and converts the optical signal of the first light beam into a first electrical signal and converts the optical signal of the second light beam into a second electrical signal; The analysis unit obtains the absorption spectrum of the sample based on the first electrical signal and the second electrical signal; The first light beam passes through the measurement cavity unit and then enters the multiplexing unit, comprising: The first light beam passes through the sample in the measurement cavity unit, reaches the reflection unit, is reflected, and then passes through the sample in the measurement cavity unit again and enters the multiplexing unit; The measurement cavity unit is a semi-open container that can allow the sample to flow in and allow the light beam to pass through the measurement cavity unit and irradiate the reflection unit; the sample is a liquid or a gas; The multiplexing unit receives the first light beam carrying sample information and the second light beam carrying light source information in time by mechanical movement, comprising: The control unit controls the motor shutter or motor movement in the multiplexing unit to switch the optical path of the multiplexing unit to receive light beams of different optical paths.

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