An endoscopic plasma monochromatic light analysis system

Abstract

The present invention discloses an endoscopic plasma monochromatic light analysis system, which belongs to the field of magnetic confinement plasma. The system consists of multiple sets of optical lens groups, flexible optical fiber arrays, narrowband filters, dichroic mirrors, spectrometers, optical detectors, indicator light sources and position adjustment motors. The front-end reflector transmits the plasma emission light at different positions to the collecting lens by rotation and focuses it on the end face of the optical fiber array. The flexible optical fiber array is used to lead the plasma emission light inside the complex structure to a low-radiation area. The light led out of the optical fiber array is converted into parallel light by a set of telecentric lenses and then passes through a narrowband filter of a specific wavelength. It is then imaged on the optical detector through a converging lens to obtain the spatial distribution and time evolution information of the plasma monochromatic light of a specific wavelength. According to the technical solution of the present invention, the needs of remote collection and analysis of the two-dimensional spectral characteristics of plasma can be met.

Description

Technical Field

[0001] This invention relates to the field of spectral analysis of magnetically confined plasmas, and more particularly to an endoscopic plasma monochromatic light analysis system. This system can penetrate the complex magnets, cryogenics, radiation shielding, and other mechanical structures surrounding a plasma device. By real-time monitoring and adjustment of the collimated optical path, it enables relatively accurate collection and analysis of the two-dimensional characteristics of the plasma spectrum. Background Art

[0002] Magnetically confined plasma devices, such as tokamaks, are surrounded by complex magnetic field coils. To achieve a strong, steady-state magnetic field, these coils must be in a superconducting state and therefore housed in an extremely low-temperature environment. High-parameter magnetic confinement plasmas require radiation shielding to protect personnel and equipment. Consequently, a variety of complex mechanical structures are installed around the periphery of the magnetic confinement plasma, making it difficult to directly install a large, integrated optical system. Magnetically confined plasmas exhibit significant spatial variations and rapid temporal changes. Characterizing and analyzing the rich information underlying these structures requires simultaneous acquisition of the two-dimensional distribution and evolution of different monochromatic light sources and the corresponding computational processing. Furthermore, obtaining monochromatic light with a specific central wavelength through a filter requires excellent collimation of the incident light; otherwise, variations in the incident angle will cause the central wavelength transmitted through the filter to shift. Therefore, it is necessary to develop a compact, endoscopic plasma monochromatic light analysis system that can circumvent complex mechanical structures and monitor and adjust the beam collimation in real time, providing an experimental basis for performance evaluation and operational control of magnetically confined plasmas. Summary of the Invention

[0003] The present invention provides an endoscopic plasma monochromatic light analysis system. The system focuses plasma light from different positions onto the entrance of an optical fiber array through a front-end first reflector and a collecting lens. The system then passes through the complex peripheral structure of magnetically confined plasma via a flexible optical fiber array and converges onto an optical detector after optical collimation and wavelength screening using a narrowband filter. Simultaneously, the system obtains information on the two-dimensional distribution and time evolution of multiple monochromatic lights in the plasma. After computational processing, multiple important information about the plasma is obtained.

[0004] According to one aspect of the present invention, an endoscopic 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 indicator optical fiber, an indicator 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 reflector, a third reflector, and a semi-transparent screen. The positional relationships of the components are as follows:

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

[0006] The parallel light beam becomes monochromatic light after passing through the first narrowband 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 indicator 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 passes through the collecting lens and is imaged at the left entrance position of the optical fiber array. The light is transmitted from the optical fiber array to the right exit position 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. The light beam 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 to further adjust the clarity of the imaging.

[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 indicator optical fiber, an indicator 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. The positional relationships of the components are 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 part of the light beam at two positions in the parallel light beam path, and pass through the second narrowband filter and the third narrowband filter and the second converging lens and the third converging lens respectively, and finally form an image 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 spot size obtained by the second optical detector and the third optical detector, the cone angle of the light beam can be calculated. Based on this, the position of the right exit of the optical fiber array is adjusted by the third position adjustment motor to obtain a parallel light beam;

[0010] The parallel light beam becomes monochromatic light after passing through the first narrowband 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 focus adjustment, the indicator light source is turned off, and the first position adjustment motor is used 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. The optical fiber array transmits the light to the right exit position, and then converts the light into a parallel beam through the telecentric collimating lens. The parallel beam passes through the first narrow-band filter and becomes a monochromatic beam. The light 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 to further adjust the clarity of the imaging.

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

[0013] The light of magnetically confined plasma surrounded by complex structures can be led out in a circuitous way. By combining a dichroic mirror, a beam splitter, a collimated optical path and a narrow-band filter, and configuring an optical collimation and focusing monitoring and adjustment structure, the collimation of parallel light can be monitored and adjusted in real time, and the spatiotemporal information of monochromatic light of multiple 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 fusion plasma devices, 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 plasma two-dimensional spectral characteristics. 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] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although 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 should not be limited by the embodiments described herein. Rather, 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 This 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 narrowband 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 relationships of the components are as follows:

[0022] When the indicator light source 9 is turned on, the indicator light is transmitted via the indicator fiber 8 to the right exit position of the fiber array 7. After passing through the telecentric collimating lens 10, it becomes a parallel beam. The first and second beam splitters 11 and 12 extract the partial beams at two positions in the parallel beam path. After passing through the second and third reflectors 16 and 17, they are illuminated on both sides of the semi-transparent screen 18. The cone angle of the beam can be determined by comparing the spot size on both sides of the semi-transparent screen 18. The cone angle of the beam is changed by adjusting the right exit position of the fiber array 7 (the same as the port position of the indicator fiber 8) using the third position adjustment motor 3 until the cone angle is zero, resulting in a parallel beam.

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

[0024] After completing the optical collimation and focus adjustments, the indicator light source 9 is turned off. The first position adjustment motor 1 is used 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. The optical fiber array 7 then transmits the light to its right exit position, where it is converted into a parallel beam by the telecentric collimating lens 10. The parallel beam passes through the first narrowband filter 13 to become a monochromatic beam. This beam is then imaged by the first converging lens 14 and is imaged by the first optical detector 15, obtaining two-dimensional image information of the monochromatic light. The clarity of the image can be further adjusted by adjusting the left entrance position of the optical fiber array 7 using 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 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 rotates to transmit the plasma emission light at different positions to the collecting lens, and then focuses it on the end face of the fiber array. A flexible fiber array is used to pass through the complex device structure to lead the plasma emission light to a low-radiation area outside the device. The plasma emission light drawn out by the fiber array is converted into parallel light by the collimating lens and then passes through a narrow-band filter of a specific wavelength. It is then imaged on the optical detector through a converging lens, thereby obtaining the spatial distribution and temporal evolution information of the plasma monochromatic light of a specific wavelength. Inserting a dichroic mirror or a spectrometer after the collimating lens can realize the collection of spatiotemporal information of a variety of monochromatic lights 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 directly driven by the motor or indirectly driven by the motor-controlled cylinder, 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 and consist of two groups of lenses, which can achieve good optical coupling with a two-dimensional 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, after passing through multiple narrow-band filters with different central wavelengths, it 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 alignment monitoring and focus adjustment mechanism. By introducing an indicator light source at the fiber array's exit end face, beam splitters are placed at two locations along the parallel light path to draw parallel light for spot size comparison testing. Based on the test results, the fiber array's exit position is adjusted to optimize the collimation of the parallel light. The monochromatic light acquisition channel at the back end uses an optical detector to obtain information on the spot size and intensity of the monochromatic indicator light. Based on this information, a position adjustment motor adjusts the position of the fiber end and optical detector, adjusting the image 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, while the point detector array is coupled to the first converging lens via an optical fiber array.

[0034] The plasma light emitted from the fiber array 7 passes through a telecentric collimating lens, converts it into parallel light, and then passes through a narrowband filter with a specific wavelength at an incident angle of nearly 0 degrees, becoming monochromatic light. This near-0-degree incident angle avoids the central wavelength shift caused by passing through the filter at a high incident angle.

[0035] Monochromatic light passing through a narrowband filter is imaged by a converging lens onto a two-dimensional optical detector, thereby obtaining information on the spatial distribution and temporal evolution of plasma monochromatic light of a specific wavelength. Alternatively, the image can be formed by a converging lens onto the end face of a two-dimensional fiber array and then directed to multiple single-point optical detectors via separate optical fibers at the other end.

[0036] Inserting a dichroic mirror between the collimating and converging lenses can separate the plasma light into different wavelength bands, allowing each to enter narrowband filters with different central wavelengths, with corresponding monochromatic images captured by an optical detector. Alternatively, inserting a beamsplitter after the collimating lens can split the incident light into two beams at a specific energy ratio. These beams then enter narrowband filters with different central wavelengths, with corresponding monochromatic images captured by an optical detector, thus forming multiple monochromatic light collection channels. The dichroic mirror and beamsplitter can be selected based on different spectroscopic requirements and can be used simultaneously at different locations along the optical path.

[0037] The system is equipped with an optical collimation and focus monitoring mechanism. An indicator light source is introduced at the fiber array's exit end face. Beamsplitters are placed at two locations along the parallel light path to draw parallel light for spot size comparison testing. Based on the test results, the fiber array's exit position is adjusted to optimize the collimation of the parallel light. The monochromatic light acquisition channel at the back end uses an optical detector to obtain the spot size and intensity information of the monochromatic indicator light. A position adjustment motor adjusts the position of the fiber end and optical detector to optimize the spot size and intensity distribution, achieving clarity adjustment.

[0038] The system may also include a computer for obtaining 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 This is a second structural diagram 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 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 narrowband filter 13, a first converging lens 14, a first optical detector 15, 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, a fifth position adjustment motor 22, and a sixth position adjustment motor 26. The positional relationships of the components are as follows:

[0040] When the indicator light source 9 is turned on, it transmits the indicator light through the indicator fiber 8 to the right exit of the fiber array 7. After passing through the telecentric collimating lens 10, it becomes a parallel beam. The first and second beam splitters 11 and 12 direct the partial beams at two locations along the parallel beam path. These partial beams pass through the second narrowband filter 19 and the third narrowband filter 23 (the second and third narrowband filters are identical), as well as the second and third converging lenses 20 and 24, respectively. The partial beams are ultimately imaged onto the photosensitive chips of the second and third optical detectors 21 and 25. The fifth position adjustment motor 22 adjusts the position of the second optical detector 21, and the sixth position adjustment motor 26 adjusts the position of the third optical detector 25 to achieve optimal image clarity. By comparing the spot sizes detected by the second and third optical detectors 21 and 25, the cone angle of the beam can be calculated. Based on this, the third position adjustment motor 3 adjusts the position of the right exit of the fiber array 7 to obtain a parallel beam. This structure enables more precise collimation of the measured monochromatic light.

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

[0042] After completing the optical collimation and focus adjustments, the indicator light source 9 is turned off. The first position adjustment motor 1 is used 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. The optical fiber array 7 then transmits the light to its right exit position, where it is converted into a parallel beam by the telecentric collimating lens 10. The parallel beam passes through the first narrowband filter 13 to become a monochromatic beam. This beam is then imaged by the first converging lens 14 and is imaged by the first optical detector 15, obtaining two-dimensional image information of the monochromatic light. The clarity of the image can be further adjusted by adjusting the left entrance position of the optical fiber array 7 using the second position adjustment motor 2.

[0043] In one embodiment, narrowband filters with different central wavelengths can be placed at the locations of the first narrowband filter 13, the second narrowband filter 19, and the third narrowband filter 23 to simultaneously acquire two-dimensional distribution information for multiple monochromatic lights. In this case, at the locations of the first beam splitter 11 and the second beam splitter 12, either a beam splitter can be installed to split the light beams into two beams based on energy, or a dichroic mirror can be installed to split the light beams into two beams based on wavelength, thereby improving the energy utilization efficiency of the monochromatic light. Images collected using different monochromatic light channels can be used to calculate the two-dimensional distribution of the intensities of the plasma's characteristic spectral lines at different wavelengths and their ratios, thereby obtaining plasma state distribution information, such as images of the electron-ion recombination process and images of the relative electron temperature distribution.

[0044] Figure 3 This is a basic operational flow chart of the endoscopic plasma monochromatic light analysis system described in the present invention. First, indicator light source 9 is turned on, and indicator light is transmitted to the right exit of fiber array 7 via indicator fiber 8. The collimated optical path is then used to detect and adjust the beam's collimation. 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 collimating optical path is composed of a third position adjustment motor 3, a telecentric collimating lens 10, a first beam splitter 11, and a second beam splitter 12. The parallel light beam after the collimation adjustment enters the converging optical path and is finally imaged and collected on an optical detector. Figure 1 The optical path includes a convergent optical path, which is composed of a first narrowband 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 example, the collection optical path consists of a first reflector 5, a first position adjustment motor 1, a second position adjustment motor 2, a collection lens 6, and a fiber array 7. After pre-adjusting the collimating and converging optical paths using the indicator light, the indicator light is turned off, plasma light signal collection begins, and the collection optical path is adjusted based on the image from the optical detector. During operation, the monochromatic light analysis system monitors the collimating optical path in real time and optimizes and adjusts the collimating and converging optical paths to ensure the accuracy of the captured monochromatic image.

Claims

1. An endoscopic 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 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 narrowband 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 after passing through the second reflector (16) and the third reflector (17), they are irradiated on both sides of the semi-transparent screen (18). 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 narrowband 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 and clear imaging; After completing the optical collimation and focusing adjustment and turning off the indicator light source (9), the first position adjustment motor (1) is used to turn the first reflector (5) toward the target plasma. 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 through the telecentric collimating lens (10). The parallel light beam passes through the first narrowband filter (13) and becomes a monochromatic light beam. The 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 regulating motor, the second position regulating motor and the third position regulating motor include one of the following: direct driving by the motor, indirect driving by the motor-controlled cylinder; Both the collecting lens and the telecentric collimating lens adopt a telecentric lens optical path design and consist 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 through 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 light beam into two light beams according to energy, or a dichroic mirror is installed to split the light beam into two light 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 intensity 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 endoscopic 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 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 narrowband filter (13), a first converging lens (14), a first optical detector (15), 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), 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 imaging 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 accordingly 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 narrowband 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 and clear imaging; After completing the optical collimation and focus adjustment, the indicating light source (9) is turned off, and the first position adjustment motor (1) is used to turn the first reflector (5) toward the target plasma. 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 is converted into a parallel light beam through the telecentric collimating lens (10). The parallel light beam passes through the first narrowband filter (13) and becomes a monochromatic light beam. The light beam passes through the first converging lens (14) and is imaged on the first optical detector (15), thereby obtaining 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 light beams into two according to energy, or dichroic mirrors are installed to split the light beams into two according to wavelength.

Images