Endoscopic plasma monochromatic light analysis system

Abstract

The invention discloses an endoscopic plasma monochromatic light analysis system, and belongs to the field of magnetic confinement plasmas. The system is composed of a plurality of sets of optical lens groups, a flexible optical fiber array, a narrow-band optical filter, a dichroscope, a spectroscope, an optical detector, an indication light source and a position adjusting motor. The front-end reflector transmits plasma emitted light at different positions to the collecting lens through rotation, and the plasma emitted light is focused on the end face of the optical fiber array. The flexible optical fiber array is used for leading out plasma emission light in the complex structure to a low-radiation area. Light led out by the optical fiber array is converted into parallel light by the telecentric lens, then the parallel light passes through the narrow-band optical filter with the specific wavelength and is imaged on the optical detector through the convergent lens, and spatial distribution and time evolution information of plasma monochromatic light with the specific wavelength is obtained. According to the technical scheme provided by the invention, the requirements of remotely collecting and analyzing the two-dimensional spectral characteristics of the plasma can be met.

Description

Technical Field

[0001] The present invention belongs to the field of spectral analysis of magnetically confined plasma, and in particular to an endoscopic plasma monochromatic light analysis system. The system can penetrate the complex magnets, cryogenics, radiation shielding and other mechanical structures around the plasma device, and achieve relatively accurate collection and analysis of the two-dimensional characteristics of the plasma spectrum through real-time monitoring and adjustment of the collimated light path. Background Art

[0002] Magnetically confined plasma devices, such as tokamaks, are surrounded by complex magnetic field coils. To obtain a steady-state strong magnetic field, these coils need to be in a superconducting state and therefore need to be placed in an extremely low temperature environment. High-parameter magnetically confined plasmas require radiation shielding to protect personnel and equipment. Therefore, a variety of complex mechanical structures are installed on the periphery of magnetically confined plasmas, making it difficult to directly install an integrated large-scale optical system. Magnetically confined plasmas vary greatly in spatial distribution and change rapidly in time. To characterize and analyze the many pieces of information hidden behind them, it is necessary to simultaneously obtain the two-dimensional distribution and evolution information of different monochromatic lights and perform corresponding calculations. In addition, obtaining monochromatic light of a specific central wavelength through a filter requires the incident light to have good collimation, otherwise the difference in the incident angle will cause the central wavelength of the filter to shift. Therefore, it is necessary to develop an endoscopic plasma monochromatic light analysis system that is compact in structure, can bypass complex mechanical structures, and can monitor and adjust the collimation of the beam in real time, to provide an experimental basis for the performance evaluation and operation control of magnetically confined plasmas. Summary of the invention

[0003] The present invention provides an endoscopic plasma monochromatic light analysis system, which focuses plasma light at different positions on the entrance position of an optical fiber array through a front first reflector and a collecting lens, passes through the complex peripheral structure of a magnetically confined plasma through a flexible optical fiber array, and then converges on an optical detector after optical collimation and band screening by a narrow-band filter, and simultaneously obtains two-dimensional distribution and time evolution information of multiple monochromatic lights in the plasma, and obtains multiple important information of the plasma after calculation and processing.

[0004] According to one aspect of the present invention, an endoscope type plasma monochromatic light analysis system is provided, comprising: a first position adjustment motor, a second position adjustment motor, a third position adjustment motor, a fourth position adjustment motor, a first reflector, a collecting lens, an optical fiber array, an indicating optical fiber, an indicating light source, a telecentric collimating lens, a first beam splitter, a second beam splitter, a first narrow band filter, a first converging lens, a first optical detector, a second reflector, a third reflector, and a semi-transparent screen, wherein the positional relationship of each component is as follows:

[0005] After the indicator light source is turned on, the indicator light is transmitted to the right exit position of the optical fiber array through the indicator optical fiber, and becomes a parallel light beam after passing through the telecentric collimating lens. The first beam splitter and the second beam splitter guide out the partial light beams at two positions in the parallel light beam path, and irradiate the partial light beams on both sides of the semi-transparent screen after passing through the second reflector and the third reflector. The cone angle of the light beam can be determined by comparing the spot sizes on both sides of the semi-transparent screen. The cone angle of the light beam is changed by adjusting the right exit position of the optical fiber array through the third position adjustment motor until the cone angle is 0, thereby obtaining a parallel light beam.

[0006] The parallel light beam becomes monochromatic light after passing through the first narrow-band filter, and is imaged on the photosensitive chip of the first optical detector by the first converging lens. The position of the first optical detector is adjusted by the fourth position adjustment motor to obtain the best clear imaging;

[0007] After completing the optical collimation and focusing adjustment and turning off the indicating light source, the first position adjustment motor is used to turn the first reflector toward the target plasma. The plasma light collected by the first reflector is imaged at the left entrance position of the optical fiber array after passing through the collecting lens, and is transmitted from the optical fiber array to the right exit position thereof, and then converted into a parallel light beam through the collimating lens. The parallel light beam becomes a monochromatic light beam after passing through the first narrow-band filter, and is imaged on the first optical detector through the first converging lens to obtain two-dimensional image information of the monochromatic light. The left entrance position of the optical fiber array is adjusted by the second position adjustment motor, so that the clarity of the imaging can be further adjusted.

[0008] According to another aspect of the present invention, an endoscopic plasma monochromatic light analysis system is provided, comprising the following components: a first position adjustment motor, a second position adjustment motor, a third position adjustment motor, a fourth position adjustment motor, a first reflector, a collecting lens, an optical fiber array, an indicating optical fiber, an indicating light source, a telecentric collimating lens, a first beam splitter, a second beam splitter, a first narrowband filter, a first converging lens, a first optical detector, a second narrowband filter, a third narrowband filter, a second converging lens, a third converging lens, a second optical detector, a third optical detector, a fifth position adjustment motor, and a sixth position adjustment motor, wherein the positional relationship of each component is as follows:

[0009] After the indicator light source is turned on, the indicator light is transmitted to the right exit position of the optical fiber array through the indicator optical fiber, and becomes a parallel light beam after passing through the collimating lens. The first beam splitter and the second beam splitter guide out the partial light beams at two positions in the parallel light beam path, respectively passing through the second narrow-band filter and the third narrow-band filter and the second converging lens and the third converging lens, and finally imaged on the photosensitive chips of the second optical detector and the third optical detector. The fifth position adjustment motor is used to adjust the position of the second optical detector, and the sixth position adjustment motor is used to adjust the position of the third optical detector until the best imaging clarity is obtained. By comparing the difference in the spot size obtained by the second optical detector and the third optical detector, the cone angle of the light beam can be calculated, and the position of the right exit of the optical fiber array is adjusted by the third position adjustment motor accordingly to obtain a parallel light beam;

[0010] The parallel light beam becomes monochromatic light after passing through the first narrow-band filter, and is imaged on the photosensitive chip of the first optical detector by the first converging lens. The position of the first optical detector is adjusted by the fourth position adjustment motor to obtain the best clear imaging;

[0011] After completing the optical collimation and focusing adjustment, turn off the indicating light source, use the first position adjustment motor to turn the first reflector toward the target plasma, the plasma light collected by the first reflector passes through the collecting lens and is imaged at the left entrance position of the optical fiber array, and is transmitted from the optical fiber array to the right exit position, and then is converted into a parallel light beam through a telecentric collimating lens. The parallel light beam becomes a monochromatic light beam after passing through the first narrow-band filter, and is imaged on the first optical detector through the first converging lens to obtain two-dimensional image information of the monochromatic light. The left entrance position of the optical fiber array is adjusted by the second position adjustment motor, and the clarity of the imaging can be further adjusted.

[0012] The beneficial effects of the present invention are:

[0013] The light of the magnetically confined plasma surrounded by a complex structure can be led out in a circuitous way. By combining a dichroic mirror, a beam splitter with a collimated optical path and a narrow-band filter and configuring an optical collimation and focusing monitoring and adjustment structure, the collimation of the parallel light can be monitored and adjusted in real time, and the spatiotemporal information of monochromatic light of a variety of central wavelengths can be obtained more accurately. After computational processing, it can be used to monitor and analyze the state of the magnetically confined plasma, promote the performance evaluation of the magnetically confined plasma, and provide data support for its operation control optimization.

[0014] The present invention can adapt to the conditions of narrow space and tortuous channels caused by the complex structure of a fusion plasma device, and at the same time monitor and adjust the collimation of the optical path in real time to meet the needs of remote collection and analysis of two-dimensional spectral characteristics of plasma. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1It is a schematic diagram of a first embodiment of an endoscopic plasma monochromatic light analysis system of the present invention.

[0016] Figure 2 It is a schematic diagram of a second embodiment of an endoscopic plasma monochromatic light analysis system of the present invention.

[0017] Figure 3 This is a workflow diagram of an endoscopic plasma monochromatic light analysis system of the present invention.

[0018] Description of reference numerals:

[0019] First position adjustment motor 1, second position adjustment motor 2, third position adjustment motor 3, fourth position adjustment motor 4, first reflector 5, collecting lens 6, optical fiber array 7, indicator optical fiber 8, indicator light source 9, telecentric collimating lens 10, first beam splitter 11, second beam splitter 12, first narrowband filter 13, first converging lens 14, first optical detector 15, second reflector 16, third reflector 17, semi-transparent screen 18, second narrowband filter 19, third narrowband filter 23, second converging lens 20, third converging lens 24, second optical detector 21, third optical detector 25, fifth position adjustment motor 22, sixth position adjustment motor 26. DETAILED DESCRIPTION

[0020] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms, and the present disclosure should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0021] Figure 1 FIG. 1 is a schematic diagram of the first structure of the endoscopic plasma monochromatic light analysis system of the present invention. Figure 1 As shown, the system includes the following components: a first position adjustment motor 1, a second position adjustment motor 2, a third position adjustment motor 3, a fourth position adjustment motor 4, a first reflector 5, a collecting lens 6, an optical fiber array 7, an indicator optical fiber 8, an indicator light source 9, a telecentric collimating lens 10, a first beam splitter 11, a second beam splitter 12, a first narrow band filter 13, a first converging lens 14, a first optical detector 15, a second reflector 16, a third reflector 17, and a semi-transparent screen 18. The positional relationship of each component is as follows:

[0022] After the indicator light source 9 is turned on, the indicator light is transmitted to the right exit position of the optical fiber array 7 through the indicator optical fiber 8, and becomes a parallel light beam after passing through the telecentric collimating lens 10. The first beam splitter 11 and the second beam splitter 12 guide the partial light beams at two positions in the parallel light beam path, and irradiate the two sides of the semi-transparent screen 18 after passing through the second reflector 16 and the third reflector 17. The cone angle of the light beam can be determined by comparing the spot size on both sides of the semi-transparent screen 18. The cone angle of the light beam is changed by adjusting the right exit position of the optical fiber array 7 (the same as the port position of the indicator optical fiber 8) through the third position adjustment motor 3 until the cone angle is 0, and a parallel light beam is obtained.

[0023] After passing through the first narrowband filter 13, the parallel light beam becomes monochromatic light (the spectral bandwidth depends on the transmission bandwidth of the narrowband filter), and is imaged on the photosensitive chip of the first optical detector 15 by the first converging lens 14. The position of the first optical detector 15 is adjusted by the fourth position adjustment motor 4 to obtain the best clear imaging.

[0024] After completing the optical collimation and focus adjustment, turn off the indicator light source 9. Use the first position adjustment motor 1 to turn the first reflector 5 toward the target plasma. The plasma light collected by the first reflector 5 passes through the collection lens 6 and is imaged at the left entrance position of the optical fiber array 7. It is transmitted from the optical fiber array 7 to its right exit position and then converted into a parallel light beam through the telecentric collimating lens 10. The parallel light beam becomes a monochromatic light beam after passing through the first narrow-band filter 13, and is imaged on the first optical detector 15 through the first converging lens 14 to obtain two-dimensional image information of monochromatic light. The clarity of the imaging can be further adjusted by adjusting the left entrance position of the optical fiber array 7 through the second position adjustment motor 2.

[0025] By replacing the first narrowband filter 13 with different central wavelengths, two-dimensional image information of multiple monochromatic lights in the plasma can be obtained.

[0026] During system operation, the plasma monochromatic light analysis system can monitor the cone angle of the light beam in real time by observing the difference in spot size on both sides of the semi-transparent screen, and adjust it as needed to obtain parallel light, thereby ensuring the accuracy of the collected monochromatic light wavelength.

[0027] In one embodiment, the indicator light source may be monochromatic light such as laser or a broadband light source.

[0028] In summary, the first reflector at the front end transmits the plasma emission light at different positions to the collecting lens by rotating, and then focuses it on the end face of the fiber array. The plasma emission light is led out to the low-radiation area outside the device by using a flexible fiber array through a complex device structure. The plasma emission light led out by the fiber array is converted into parallel light by the collimating lens and passes through a narrow-band filter of a specific wavelength, and then imaged on the optical detector through a converging lens, thereby obtaining the spatial distribution and time evolution information of the plasma monochromatic light of a specific wavelength. Inserting a dichroic mirror or a beam splitter after the collimating lens can realize the collection of a variety of monochromatic light spatiotemporal information to meet different analysis needs. The system is equipped with a beam collimation monitoring and adjustment unit to improve the accuracy of the monochromatic light wavelength passing through the narrow-band filter, and achieve clear imaging by adjusting the position of the fiber end and the optical detector.

[0029] In one embodiment, the first position adjustment motor, the second position adjustment motor, and the third position adjustment motor can be driven directly by the motor or indirectly by controlling the cylinder through the motor, and the motor is placed in a low magnetic field area to reduce the impact of the strong magnetic field environment on the operation of the motor.

[0030] In one embodiment, both the collecting lens and the telecentric collimating lens adopt a telecentric lens optical path design, which consists of two groups of lenses and can achieve good optical coupling with a two-dimensional optical fiber array light source.

[0031] Inserting a dichroic mirror or a beam splitter after the telecentric collimating lens can separate the plasma light by wavelength or energy. At the same time, it passes through multiple narrow-band filters with different central wavelengths and is focused on the optical detector by a converging lens, realizing the simultaneous collection of multiple monochromatic light spatiotemporal information.

[0032] The system is equipped with an optical collimation monitoring and focus adjustment mechanism. By introducing an indicator light source at the end face of the fiber array outlet, a beam splitter is set at two positions on the parallel light path to draw out parallel light for spot size comparison detection. The fiber array outlet position is adjusted according to the detection results to optimize the collimation of parallel light. The monochromatic light collection channel at the back end can use the optical detector to obtain the spot size and intensity information of the monochromatic indicator light, and adjust the position of the fiber end and the optical detector through the position adjustment motor to achieve the adjustment of the imaging clarity on the optical detector.

[0033] In one embodiment, the first optical detector 15 can be a two-dimensional imaging detector or a point detector array. The two-dimensional imaging detector is directly coupled to the first converging lens, and the point detector array is coupled to the first converging lens through an optical fiber array.

[0034] The plasma emission light from the optical fiber array 7 is converted into parallel light after passing through the telecentric collimating lens, and passes through a narrow-band filter of a specific wavelength at a nearly 0-degree incident angle to become monochromatic light. Nearly 0-degree incidence can avoid the central wavelength deviation caused by passing through the filter at a large incident angle.

[0035] The monochromatic light passing through the narrowband filter is imaged on a two-dimensional optical detector after passing through a converging lens, thereby obtaining the spatial distribution and time evolution information of plasma monochromatic light of a specific wavelength. It can also be imaged on the end face of a two-dimensional optical fiber array through a converging lens, and then introduced into multiple single-point optical detectors through the separated optical fibers at the other end.

[0036] Inserting a dichroic mirror between the collimating lens and the converging lens can separate the plasma light by wavelength band, and enter the narrowband filters with different central wavelengths respectively, and obtain the corresponding monochromatic light image by the optical detector. It is also possible to insert a beam splitter after the collimating lens to split an incident light beam into two beams according to a certain energy ratio, and enter the narrowband filters with different central wavelengths respectively, and obtain the corresponding monochromatic light image by the optical detector, forming multiple monochromatic light collection channels. The dichroic mirror and the beam splitter can be selected according to different splitting requirements, and can also be used simultaneously at different positions of the optical path.

[0037] The system is equipped with an optical collimation and focus monitoring adjustment mechanism. An indicator light source is introduced at the exit end of the fiber array. A beam splitter is set at two positions on the parallel light path to draw out parallel light for spot size comparison detection. The exit position of the fiber array is adjusted according to the detection results to optimize the collimation of the parallel light. The monochromatic light collection channel at the back end can use an optical detector to obtain the spot size and intensity information of the monochromatic indicator light. The position of the fiber end and the optical detector is adjusted by the position adjustment motor to optimize the spot size and intensity distribution and achieve clarity adjustment.

[0038] The system may also include a computer for acquiring the two-dimensional distribution of the intensity of characteristic spectral lines of different wavelengths of the plasma and the ratios therebetween, thereby obtaining plasma state distribution information, such as an image of the electron-ion recombination process and an image of the relative distribution of electron temperature.

[0039] Figure 2 FIG. 2 is a schematic diagram of the second structure of the endoscopic plasma monochromatic light analysis system of the present invention. Figure 2As shown, the system includes the following components: a first position adjustment motor 1, a second position adjustment motor 2, a third position adjustment motor 3, a fourth position adjustment motor 4, a first reflector 5, a collecting lens 6, an optical fiber array 7, an indicating optical fiber 8, an indicating light source 9, a telecentric collimating lens 10, a first beam splitter 11, a second beam splitter 12, a first narrow-band filter 13, a first converging lens 14, a first optical detector 15, a second narrow-band filter 19, a third narrow-band filter 23, a second converging lens 20, a third converging lens 24, a second optical detector 21, a third optical detector 25, a fifth position adjustment motor 22, and a sixth position adjustment motor 26. The positional relationship of each component is as follows:

[0040] After the indicator light source 9 is turned on, the indicator light is transmitted to the right exit position of the optical fiber array 7 through the indicator optical fiber 8, and becomes a parallel light beam after passing through the telecentric collimating lens 10. The first beam splitter 11 and the second beam splitter 12 guide the partial light beams at two positions in the parallel light beam path, respectively passing through the second narrowband filter 19 and the third narrowband filter 23 (the second and third narrowband filters are the same) and the second converging lens 20 and the third converging lens 24, and finally imaged on the photosensitive chips of the second optical detector 21 and the third optical detector 25. The fifth position adjustment motor 22 is used to adjust the position of the second optical detector 21, and the sixth position adjustment motor 26 is used to adjust the position of the third optical detector 25 until the best imaging clarity is obtained. By comparing the spot size difference obtained by the second optical detector 21 and the third optical detector 25, the cone angle of the light beam can be calculated, and the position of the right exit of the optical fiber array 7 is adjusted by the third position adjustment motor 3 to obtain a parallel light beam. This structure can make more precise collimation adjustment for the measured monochromatic light.

[0041] After passing through the first narrowband filter 13, the parallel light beam becomes monochromatic light (the spectral bandwidth depends on the transmission bandwidth of the narrowband filter), and is imaged on the photosensitive chip of the first optical detector 15 by the first converging lens 14. The position of the first optical detector 15 is adjusted by the fourth position adjustment motor 4 to obtain the best clear imaging.

[0042] After completing the optical collimation and focus adjustment, turn off the indicator light source 9. Use the first position adjustment motor 1 to turn the first reflector 5 toward the target plasma. The plasma light collected by the first reflector 5 passes through the collection lens 6 and is imaged at the left entrance position of the optical fiber array 7. It is transmitted from the optical fiber array 7 to its right exit position and then converted into a parallel light beam through the telecentric collimating lens 10. The parallel light beam becomes a monochromatic light beam after passing through the first narrow-band filter 13, and is imaged on the first optical detector 15 through the first converging lens 14 to obtain two-dimensional image information of monochromatic light. The clarity of the imaging can be further adjusted by adjusting the left entrance position of the optical fiber array 7 through the second position adjustment motor 2.

[0043] In one embodiment, narrowband filters with different central wavelengths can be placed at the positions of the first narrowband filter 13, the second narrowband filter 19, and the third narrowband filter 23, and two-dimensional distribution information of multiple monochromatic lights can be obtained at the same time. At this time, at the positions of the first beam splitter 11 and the second beam splitter 12, a beam splitter can be installed to split the light beams into two beams according to energy, or a dichroic mirror can be installed to split the light beams into two beams according to wavelength to improve the energy utilization efficiency of monochromatic light. The images collected by different monochromatic light channels can be used to calculate the two-dimensional distribution of the intensity of characteristic spectral lines of different wavelengths of plasma and the ratios therebetween, thereby obtaining plasma state distribution information, such as an image of the electron-ion recombination process and an image of the relative distribution of electron temperature.

[0044] Figure 3 This is the basic operation flow chart of the endoscopic plasma monochromatic light analysis system of the present invention. First, the indicator light source 9 is turned on, and the indicator light is transmitted to the right exit position of the optical fiber array 7 through the indicator optical fiber 8. Then the collimation light path is used to complete the beam collimation detection and adjustment. Figure 1 The middle collimating optical path is composed of a third position adjustment motor 3 , a telecentric collimating lens 10 , a first beam splitter 11 , a second beam splitter 12 , a second reflector 16 , a third reflector 17 and a semi-transparent screen 18 . Figure 2 The middle collimating optical path is composed of the third position adjustment motor 3, the telecentric collimating lens 10, the first beam splitter 11, and the second beam splitter 12. The parallel light beam that has completed the collimation adjustment enters the converging optical path, and is finally imaged and collected on the optical detector. Figure 1 The optical path includes a set of convergent optical paths, which are composed of a first narrow-band filter 13 , a first convergent lens 14 , a first optical detector 15 and a fourth position adjustment motor 4 . Figure 2 There are three sets of converging light paths, Figure 1 Two are added, which are composed of a second narrowband filter 19, a third narrowband filter 23, a second converging lens 20, a third converging lens 24, a second optical detector 21, a third optical detector 25, and a fifth position adjustment motor 22 and a sixth position adjustment motor 26. Figure 2 The same narrow-band filters are installed in the two sets of converging light paths to accurately detect the collimation of the light beam. Different narrow-band filters can also be installed to obtain a variety of monochromatic light information in the plasma at the same time. Figure 2 In the embodiment, the collecting optical path is composed of a first reflector 5, a first position adjustment motor 1, a second position adjustment motor 2, a collecting lens 6 and an optical fiber array 7. After the pre-adjustment of the collimating optical path and the converging optical path is completed by using the indicator light, the indicator light is turned off, the plasma optical signal is collected, and the collecting optical path is adjusted according to the image of the optical detector. During the operation of the monochromatic light analysis system, the collimating optical path can be monitored in real time and the collimating optical path and the converging optical path can be further optimized and adjusted to ensure the accuracy of the collected monochromatic light image.

Claims

1. An endoscope plasma monochromatic light analysis system, characterized in that: The invention comprises the following components: a first position adjustment motor (1), a second position adjustment motor (2), a third position adjustment motor (3), a fourth position adjustment motor (4), a first reflector (5), a collecting lens (6), an optical fiber array (7), an indicating optical fiber (8), an indicating light source (9), a telecentric collimating lens (10), a first beam splitter (11), a second beam splitter (12), a first narrow-band filter (13), a first converging lens (14), a first optical detector (15), a second reflector (16), a third reflector (17), and a semi-transparent screen (18). The positional relationship of the components is as follows: After the indicator light source (9) is turned on, the indicator light is transmitted to the right exit position of the optical fiber array (7) through the indicator optical fiber (8), and becomes a parallel light beam after passing through the telecentric collimating lens (10). The first beam splitter (11) and the second beam splitter (12) guide the partial light beams at two positions in the parallel light beam path, and irradiate the partial light beams at two sides of the semi-transparent screen (18) after passing through the second reflector (16) and the third reflector (17). The cone angle of the light beam can be determined by comparing the spot sizes on both sides of the semi-transparent screen (18). The cone angle of the light beam is changed by adjusting the right exit position of the optical fiber array (7) through the third position adjustment motor (3) until the cone angle is 0, thereby obtaining a parallel light beam. The parallel light beam becomes monochromatic light after passing through the first narrow-band filter (13), and is imaged on a photosensitive chip of a first optical detector (15) by a first converging lens (14). The position of the first optical detector (15) is adjusted by a fourth position adjustment motor (4) to obtain optimal clear imaging; After the optical collimation and focus adjustment are completed and the indicating light source (9) is turned off, the first reflector (5) is turned toward the target plasma by using the first position adjustment motor (1). The plasma light collected by the first reflector (5) passes through the collection lens (6) and is imaged at the left entrance position of the optical fiber array (7). The light is transmitted from the optical fiber array (7) to the right exit position thereof and then converted into a parallel light beam by the telecentric collimating lens (10). The parallel light beam passes through the first narrowband filter (13) and becomes a monochromatic light beam. The parallel light beam passes through the first converging lens (14) and is imaged on the first optical detector (15) to obtain two-dimensional image information of the monochromatic light. The left entrance position of the optical fiber array (7) is adjusted by the second position adjustment motor (2), so that the clarity of the imaging can be further adjusted.

2. The endoscopic plasma monochromatic light analysis system according to claim 1, characterized in that: The indicator light source includes one of the following: laser, broad spectrum light source; The driving modes of the first position adjustment motor, the second position adjustment motor and the third position adjustment motor include one of the following: direct motor drive, indirect motor control cylinder drive; Both the collecting lens and the telecentric collimating lens adopt a telecentric lens optical path design and are composed of two groups of lenses.

3. The endoscopic plasma monochromatic light analysis system according to claim 1, characterized in that: The first optical detector (15) is a two-dimensional imaging detector or a point detector array, wherein, when the first optical detector (15) is a two-dimensional imaging detector, the two-dimensional imaging detector is directly coupled to the first converging lens (14), and when the first optical detector (15) is a point detector array, the point detector array is coupled to the first converging lens via an optical fiber array.

4. The endoscopic plasma monochromatic light analysis system according to claim 1, characterized in that: At the positions of the first beam splitter (11) and the second beam splitter (12), a beam splitter is installed to split the beams into two beams according to energy, or a dichroic mirror is installed to split the beams into two beams according to wavelength.

5. The endoscopic plasma monochromatic light analysis system according to claim 1, characterized in that: Also includes: The computer is used to obtain the two-dimensional distribution of the intensities of characteristic spectral lines of different wavelengths of the plasma and the ratios therebetween from the imaging of the first optical detector (15).

6. An endoscope plasma monochromatic light analysis system, characterized in that: The system comprises the following components: a first position adjustment motor (1), a second position adjustment motor (2), a third position adjustment motor (3), a fourth position adjustment motor (4), a first reflector (5), a collecting lens (6), an optical fiber array (7), an indicating optical fiber (8), an indicating light source (9), a telecentric collimating lens (10), a first beam splitter (11), a second beam splitter (12), a first narrow-band filter (13), a first converging lens (14), a first optical detector (15), a second narrow-band filter (19), a third narrow-band filter (23), a second converging lens (20), a third converging lens (24), a second optical detector (21), a third optical detector (25), a fifth position adjustment motor (22), and a sixth position adjustment motor (26). The positional relationships of the components are as follows: After the indicator light source (9) is turned on, the indicator light is transmitted to the right exit position of the imaging fiber array (7) through the indicator optical fiber (8), and becomes a parallel light beam after passing through the telecentric collimating lens (10). The first beam splitter (11) and the second beam splitter (12) guide the partial light beams at two positions in the parallel light beam path, respectively passing through the second narrowband filter (19) and the third narrowband filter (23) and the second converging lens (20) and the third converging lens (24), and finally imaged on the photosensitive chips of the second optical detector (21) and the third optical detector (25). The fifth position adjustment motor (22) is used to adjust the position of the second optical detector (21), and the sixth position adjustment motor (26) is used to adjust the position of the third optical detector (25) until the best imaging clarity is obtained. By comparing the difference in the spot size obtained by the second optical detector (21) and the third optical detector (25), the cone angle of the light beam can be calculated, and based on this, the position of the right exit of the fiber array (7) is adjusted by the third position adjustment motor (3) to obtain a parallel light beam; The parallel light beam becomes monochromatic light after passing through the first narrow-band filter (13), and is imaged on a photosensitive chip of a first optical detector (15) by a first converging lens (14). The position of the first optical detector (15) is adjusted by a fourth position adjustment motor (4) to obtain optimal clear imaging; After the optical collimation and focus adjustment are completed, the indicating light source (9) is turned off, and the first reflector (5) is turned toward the target plasma by using the first position adjustment motor (1). The plasma light collected by the first reflector (5) passes through the collecting lens (6) and is imaged at the left entrance position of the optical fiber array (7). The light is transmitted from the optical fiber array (7) to the right exit position thereof and then converted into a parallel light beam by the telecentric collimating lens (10). The parallel light beam passes through the first narrowband filter (13) and becomes a monochromatic light beam. The parallel light beam passes through the first converging lens (14) and is imaged on the first optical detector (15) to obtain two-dimensional image information of the monochromatic light. The left entrance position of the optical fiber array (7) is adjusted by the second position adjustment motor (2), so that the clarity of the imaging can be further adjusted.

7. The endoscopic plasma monochromatic light analysis system according to claim 6, characterized in that: Narrowband filters of different wavelengths are placed at the positions of the first narrowband filter (13), the second narrowband filter (19) and the third narrowband filter (23); and beam splitters are installed at the positions of the first beam splitter (11) and the second beam splitter (12) to split the beams into two beams according to energy, or dichroic mirrors are installed to split the beams into two beams according to wavelength.

Images