A solid source polarization interferometer integrated device for nuclear fusion experimental device

Abstract

The invention discloses a solid source polarization interferometer integrated device for a nuclear fusion experimental device, which relates to the field of optical technology and comprises at least three solid sources, a polarization interferometer optical path system, a corner reflector, a reference track detector and a detection track detector; one of the at least three solid sources is fixed frequency, and the other solid sources are frequency modulated; the light signal sent by the fixed frequency solid source is respectively transmitted to the reference track detector and the detection track detector through the splitting and reflection operations in the polarization interferometer optical path system; the light signal sent by the frequency modulated solid source is transmitted to the reference track detector through the splitting, reflection and beam combining operations in the polarization interferometer optical path system; the light signal sent by the frequency modulated solid source is transmitted to the reference track detector through the interferometer optical path system through plasma and transmitted to the corner reflector, and is beam combined after passing through the corner reflector and enters the detection track detector; the solid source polarization interferometer integrated device has a compact structure and can realize real-time monitoring.

Description

Technical Field

[0001] The invention relates to the field of optical technology, and in particular to a solid source polarization interferometer integrated device for a nuclear fusion experimental device. Background Art

[0002] In magnetic confinement fusion experimental devices and space plasma experimental simulation and research devices, plasma electron density is one of the key physical parameters. Since the current density distribution is closely related to the stability and confinement of the plasma, the measurement and feedback control of the current distribution plays an important role in tokamaks and future fusion reactors. In order to quickly and accurately measure this parameter in experiments, countless laboratories have begun years of exploration. After years of development, interferometers have been established as a reliable method for measuring electron density and have also been used in other fusion experimental devices.

[0003] Traditionally, far-infrared (FIR) lasers are selected as the detection light source for typical interferometer and polarimeter systems to provide the required power output for operation in high-temperature plasmas. For example, the HCN laser used in the EAST Tokamak experimental device is widely used in interferometer systems. Although it can provide relatively stable output, it is bulky and occupies a large experimental space, and the difference frequency signal modulated by its rotating grating is low, which limits the time resolution of the system. At the same time, the polarization interferometer system developed on the EAST Tokamak experimental device uses three carbon dioxide-pumped formic acid lasers. Although the system has improved power output stability and time resolution, the entire laser system requires the construction of a large laser clean room with constant temperature and humidity vibration reduction effects. In addition, the system uses the dual laser principle for difference frequency output, and the difference frequency output also needs to be adjusted by the staff at any time during the experiment, which increases the operating cost. These traditional gas laser systems have certain limitations in terms of space occupied, output stability and time resolution. Summary of the invention

[0004] Based on the technical problems existing in the background technology, the present invention proposes a solid source polarization interferometer integrated device for a nuclear fusion experimental device, which has a compact structure and can be monitored in real time, and realizes the diversity of frequency regulation, multi-channel measurement capability and high fault response.

[0005] The present invention proposes a solid source polarization interferometer integrated device for a nuclear fusion experimental device, comprising a fixed frequency solid source, a first frequency modulated solid source and a second frequency modulated solid source, a polarization interferometer optical path system, a corner reflector, a reference track detector and a detection track detector;

[0006] The optical signal sent by the fixed-frequency solid source is transmitted to the reference channel detector and the detection channel detector respectively through the splitting and reflection operations in the polarization interferometer optical path system;

[0007] A portion of the optical signal sent by the first frequency-modulated solid source undergoes a change in polarization direction in the optical path system of the polarization interferometer, and is combined and collinear with the optical signal sent by the second frequency-modulated solid source in the optical path system of the polarization interferometer, and the collinear light is converted into circularly polarized light, and the circularly polarized light is transmitted through the plasma to the corner reflector, and then enters the detection channel detector after passing through the corner reflector;

[0008] Another part of the optical signals of the first frequency modulated solid source and the second frequency modulated solid source enter the reference track detector through the polarization interferometer optical path system;

[0009] Further, the reference track detector is used to detect the optical signals sent by the fixed-frequency solid source, the first frequency-modulated solid source and the second frequency-modulated solid source;

[0010] The detection channel detector is used to detect the optical signals sent by the fixed-frequency solid source, the first frequency-modulated solid source and the second frequency-modulated solid source, so that the solid source polarization interferometer integrated device can calculate the plasma electron density and the Faraday rotation angle according to the combined beam signal.

[0011] Furthermore, the polarization interferometer optical path system includes a reference optical path and a detection optical path, and the reference optical path and the detection optical path share part of the optical structure;

[0012] The reference optical path includes a first condenser lens, a second condenser lens, a third condenser lens, a 1 / 2 wave plate, a polarization beam splitter, a second beam splitter, a third beam splitter, a third reflector and a sixth beam splitter;

[0013] The optical signal sent by the fixed-frequency solid source passes through the first condenser lens, the second beam splitter, and the third beam splitter in sequence and enters the reference track detector;

[0014] The optical signal sent by the first frequency modulated solid source passes through the second condenser lens, the 1 / 2 wave plate, the polarization beam splitter, and the third beam splitter in sequence and enters the reference track detector;

[0015] The optical signal sent by the second frequency-modulated solid source passes through the third condenser lens, the third reflector, the sixth beam splitter, the polarization beam splitter, and the third beam splitter in sequence and enters the reference track detector.

[0016] Further, the detection path optical path includes a second reflector, a fourth beam splitter, a first reflector, a fifth beam splitter, a quarter wave plate, a telescope system, a fourth reflector and a seventh beam splitter;

[0017] The optical signal sent by the fixed-frequency solid source passes through the first condenser lens, the second beam splitter, the second reflector, and the fourth beam splitter in sequence and enters the detection channel detector;

[0018] The optical signal sent by the first frequency modulated solid source passes through the second condenser lens, polarization beam splitter, first reflector, fifth beam splitter, 1 / 4 wave plate, telescope system, fourth reflector, seventh beam splitter, and then passes through the plasma to the corner reflector, and then reflects through the corner reflector and passes through the seventh beam splitter and fourth beam splitter to enter the detection channel detector;

[0019] The optical signal sent by the second frequency modulated solid source passes through the third condenser lens, the third reflector, the sixth beam splitter, the fifth beam splitter, the 1 / 4 wave plate, the telescope system, the fourth reflector, the seventh beam splitter, and then passes through the plasma to the corner reflector. After being reflected by the corner reflector, the optical signal passes through the seventh beam splitter and the fourth beam splitter in turn to enter the detection channel detector;

[0020] Furthermore, the optical signal sent by the first frequency-modulated solid source and the optical signal sent by the second frequency-modulated solid source are combined after passing through a polarization beam splitter, and are converted into circularly polarized signals after passing through a quarter wave plate.

[0021] Furthermore, the fixed-frequency solid source is a fixed-frequency 650 GHz solid source, the frequencies of the first frequency-modulated solid source and the second frequency-modulated solid source are different, the difference between the first frequency-modulated solid source and the fixed-frequency solid source is +0.850 MHz, and the difference between the second frequency-modulated solid source and the fixed-frequency solid source is -1.275 MHz.

[0022] Furthermore, part of the data collected by the reference channel detector and the detection channel detector enters the phase comparator to calculate the plasma electron density and Faraday rotation angle in real time and output them, and the other part enters the spectrometer to process to obtain three different intermediate frequency signals, and then the intermediate frequency signal and power signal are transmitted to the host computer terminal.

[0023] Furthermore, the frequency of the frequency modulated solid source is adjusted by a frequency control module of the host computer.

[0024] Furthermore, the reference channel detector and the detection channel detector are field effect transistor detectors.

[0025] The advantages of the solid source interferometer integrated device for a nuclear fusion experimental device provided by the present invention are: compact structure and real-time monitoring, realizing the diversity of frequency adjustment, multi-channel measurement capability and high fault response, greatly enhancing the flexibility, reliability and measurement accuracy of the system. The system is particularly suitable for high-precision and high-efficiency plasma electron density measurement, providing strong technical support for accurate monitoring in complex experimental environments; the construction of three channels introduces polarization signals, which can not only obtain Faraday rotation angle data, but also deduce the size and disturbance of the external magnetic field during the fusion experiment, which is of great significance for whether the experiment can run stably; the compactness and stability of the device are achieved through a small and stable 650GHz solid source and a reasonably laid out optical path design. The corner reflector is fixed on the window flange to return the detection optical path to the original path, avoiding the use of a large bracket. The integrated device not only supports vertical and horizontal position measurements, but can also be expanded into a multi-channel system to achieve multi-line integrated electron density measurement. At the same time, the integrated device is also equipped with a remote control and monitoring module. The operator can remotely adjust the host module, detector phase comparator module, and frequency control module through the control terminal to control the operating parameters of the system. Finally, the data recording module can be used to perform real-time detection of all system parameters to improve operational efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the present invention;

[0027] Figure 2 It is a schematic diagram of the expanded structure of the integrated device when the corner reflector is fixed on the horizontal window;

[0028] Figure 3 It is a structural schematic diagram of the optical path passing through the interferometer optical path system;

[0029] Figure 4 It is a schematic diagram of the control structure of the integrated device;

[0030] Among them, 1-fixed frequency solid source, 2-first frequency modulation solid source, 3-second frequency modulation solid source, 4-1-first condensing lens, 4-2-second condensing lens, 4-3-third condensing lens, 5-second beam splitter, 6-third beam splitter, 7-reference track detector, 8-polarization beam splitter, 9-first reflector, 10-fifth beam splitter, 11-convex lens, 12-concave lens, 13-fourth reflector, 14-seventh beam splitter, 15-corner reflector, 16-detection track detector, 17-second reflector, 18-fourth beam splitter, 19-sixth beam splitter, 20-third reflector, 21-table optical path, 22-1 / 2 wave plate, 23-1 / 4 wave plate. DETAILED DESCRIPTION

[0031] Below, the technical solution of the present invention is described in detail through specific embodiments. Many specific details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific implementation disclosed below.

[0032] The recent rapid development of terahertz technology has made solid-state sources a viable solution to these problems. This technology has been applied to multiple tokamaks, such as KTX and DIII-D. This embodiment uses a 650GHz terahertz solid source to build a polarization interferometer system. Compared with traditional gas lasers, terahertz solid sources have the advantages of small size, compact structure, and stable output signal. Its maximum output power can reach 10mW, and the difference frequency output is stable. By using corner reflectors to achieve a double-path design, such systems no longer rely on large optical brackets, greatly reducing the space occupied by the system. In addition, the system can provide accurate measurements in the plasma density range of 1×10^17 m^-3 to 1×10^19 m^-3, and is particularly suitable for density measurements at the boundary position of tokamak experimental devices and applications in space plasma experimental simulation and research devices. Solid-state sources have more stable IFs and can produce lower density noise, which is conducive to low-density measurements. By using nonlinear electronic devices to extend the traditional microwave frequency range, solid-state sources provide multiple advantages, including compact size, stable intermediate frequency (IF) for continuous heterodyne measurement, moderate power output, and relatively low cost. The life of the system depends on the degradation of the planar diodes. Usually these diodes operate under low current or no current conditions and have a reasonable life. If necessary, the multiplier can be replaced separately for maintenance. This embodiment is based on the design of the terahertz solid source and the polarization interferometer optical path system, and introduces polarization signals. Not only can the Faraday rotation angle data be obtained, but also the size and disturbance of the external magnetic field during the fusion experiment can be deduced, which is of great significance for whether the experiment can run stably.

[0033] like Figures 1 to 4 As shown, a solid source interferometer integrated device for a nuclear fusion experimental device proposed by the present invention comprises a fixed frequency solid source 1, a first frequency modulated solid source 2 and a second frequency modulated solid source 3, an interferometer optical path system, a corner reflector 15, a reference channel detector 7 and a detection channel detector 16;

[0034] The optical signal sent by the fixed-frequency solid source 1 is transmitted to the reference channel detector 7 and the detection channel detector 16 respectively through the splitting and reflection operations in the interferometer optical path system; a part of the optical signal sent by the first frequency-modulated solid source 2 undergoes a change in polarization direction in the polarization interferometer optical path system, and is combined and collinear with the optical signal sent by the second frequency-modulated solid source 3 in the polarization interferometer optical path system, and the collinear light is converted into circularly polarized light, and the circularly polarized light is transmitted through the plasma to the corner reflector 15, and then enters the detection channel detector 16 after passing through the corner reflector 15; another part of the optical signal sent by the frequency-modulated solid source 2 undergoes a change in polarization direction in the polarization interferometer optical path system, and is combined and collinear with the optical signal sent by the second frequency-modulated solid source 3 in the polarization interferometer optical path system, and the collinear light is converted into circularly polarized light. The circularly polarized light is transmitted to the corner reflector 15 through the plasma, and then enters the detection channel detector 16 after passing through the corner reflector 15; A part of the light signal passes through the polarization interferometer optical path system, and another part of the light signal of the second frequency-modulated solid source 3 passes through the polarization interferometer optical path system, and both enter the reference track detector 7; the reference track detector 7 is used to detect the light signals sent by the fixed-frequency solid source 1, the first frequency-modulated solid source 2 and the second frequency-modulated solid source 3; the detection track detector 16 is used to detect the light signals sent by the fixed-frequency solid source 1, the first frequency-modulated solid source 2 and the second frequency-modulated solid source 3, so that the solid source polarization interferometer integrated device can calculate the plasma electron density and the Faraday rotation angle according to the combined beam signal.

[0035] In this embodiment, the fixed-frequency solid source 1 is a fixed-frequency 650GHz solid source, the frequencies of the first frequency-modulated solid source 2 and the second frequency-modulated solid source 3 are different from each other, the difference between the first frequency-modulated solid source 2 and the fixed-frequency solid source 1 is +0.850MHz, and the difference between the second frequency-modulated solid source 3 and the fixed-frequency solid source 1 is -1.275 MHz. By adopting a multi-laser method, the difference frequency between the frequency-modulated solid source and the fixed-frequency solid source 1 can be arbitrarily adjusted within the megahertz range to achieve high time resolution measurement.

[0036] The polarization interferometer optical path system of the present application includes a reference optical path and a detection optical path. The reference optical path and the detection optical path share part of the optical structure. Based on the setting of the part of the optical structure, the number of optical devices used is reduced, which provides a basis for the miniaturization of the solid source polarization interferometer integrated device.

[0037] The reference channel detector 7 and the detection channel detector 16 use AlGaN / GaN-HEMT field effect tube detectors, which are small in size and can be used at room temperature. In addition, the corner reflector 15 is directly fixed to the upper window or horizontal window of the measuring device to return the detection light path to the original path, reduce the number of optical devices used, and do not require large bracket support. According to the measurement requirements, two measurement schemes, vertical measurement and horizontal measurement, can be realized. Figure 2 As shown, when the corner reflector 15 is fixed to the horizontal window, necessary optical reflectors are added to the other side, and the solid source interferometer optical platform and the table optical path 21 are placed on the side of the device, horizontal measurement can be achieved.

[0038] Except for the corner reflector 15 which is fixed by a supporting mechanism on the optical platform, other optical structures are compactly fixed on the optical platform.

[0039] The optical path system of the polarization interferometer adopts the heterodyne measurement principle. By adjusting the frequency of the adjustable 650GHz frequency-modulated solid source, a frequency difference of the order of megahertz is generated between it and the fixed frequency 650GHz fixed frequency solid source 1. When the light beams of the fixed frequency solid source 1, the first frequency-modulated solid source 2 and the second frequency-modulated solid source 3 enter the detector (reference channel detector 7 and detection channel detector 16) after beam combination, a megahertz-level beat frequency signal will be generated, providing a basis for high time resolution measurement. The optical path design includes two paths (reference channel optical path and detection channel optical path): the detection channel optical path passes through the plasma region as the detection channel, and the reference channel optical path does not pass through the plasma region and serves as the reference channel. After the plasma is generated, the light beam in the detection channel optical path will be phase shifted. After heterodyne comparison of the signal of the detection channel with the signal of the reference channel, the phase change caused by the propagation of the light beam in the plasma can be calculated, thereby calculating the electron density and Faraday rotation angle of the plasma.

[0040] By adjusting the frequencies of the first frequency-modulated solid source 2 and the second frequency-modulated solid source 3, a frequency difference of the order of megahertz is generated between the three solid sources (fixed-frequency solid source 1, first frequency-modulated solid source 2, and second frequency-modulated solid source 3). The lasers output by the fixed-frequency solid source 1, the first frequency-modulated solid source 2, and the second frequency-modulated solid source 3 have a small output beam waist and a large divergence. Therefore, in the interferometer optical path system, the beam waist needs to be changed to a suitable size after passing through a condenser lens (i.e., the first condenser lens 4-1, the second condenser lens 4-2, and the third condenser lens 4-3).

[0041] The optical signal sent by the fixed frequency solid source 1 passes through the first condenser lens 4-1, the second beam splitter 5, and the third beam splitter 6 in sequence and enters the reference track detector 7. The optical signal sent by the first frequency modulated solid source 2 passes through the second condenser lens 4-2, the 1 / 2 wave plate 22, the polarization beam splitter 8, and the third beam splitter 6 in sequence and enters the reference track detector 7. The optical signal sent by the second frequency modulated solid source 3 passes through the third condenser lens 4-3, the third reflector 20, the sixth beam splitter 19, the polarization beam splitter 8, and the third beam splitter 6 in sequence and enters the reference track detector 7. Thus, three reference track beat frequency signals are generated.

[0042] The optical signal sent by the fixed-frequency solid source 1 passes through the first condenser lens 4-1, the second beam splitter 5, the second reflector 17, and the fourth beam splitter 18 in sequence to enter the detection path detector 16; the optical signal sent by the first frequency-modulated solid source 2 passes through the second condenser lens 4-2, the polarization beam splitter 8, the first reflector 9, the fifth beam splitter 10, the 1 / 4 wave plate 23, the telescope system, the fourth reflector 13, and the seventh beam splitter 14 in sequence, and then passes through the plasma and is transmitted to the corner reflector 15. After being reflected by the corner reflector 15, it passes through the seventh beam splitter 14 and the fourth beam splitter 18 in sequence to enter the detection path detector 16; the second frequency-modulated solid source 2 passes through the second condenser lens 4-2, the polarization beam splitter 8, the first reflector 9, the fifth beam splitter 10, the 1 / 4 wave plate 23, the telescope system, the fourth reflector 13, and the seventh beam splitter 14 in sequence, and then passes through the plasma and is transmitted to the corner reflector 15. After being reflected by the corner reflector 15, it passes through the seventh beam splitter 14 and the fourth beam splitter 18 in sequence to enter the detection path detector 16; The optical signal sent by the frequency modulated solid source 3 passes through the third condenser lens 4-3, the third reflector 20, the sixth beam splitter 19, the fifth beam splitter 10, the 1 / 4 wave plate 23, the telescope system, the fourth reflector 13, and the seventh beam splitter 14 in turn, and then passes through the plasma and is transmitted to the corner reflector 15. After being reflected by the corner reflector 15, it passes through the seventh beam splitter 14 and the fourth beam splitter 18 in turn to enter the detection channel detector 16; the optical signal sent by the first frequency modulated solid source 2 and the optical signal sent by the second frequency modulated solid source 3 are combined after passing through the polarization beam splitter 8, and become a circularly polarized signal after passing through the 1 / 4 wave plate 23.

[0043] It can be understood that the laser passes through the telescope system, is vertically incident by a 45-degree angle reflector, passes through the plasma after passing through the seventh beam splitter 14, and then returns to its original path by the corner reflector 15 directly fixed to the top flange of the device, so that the light signals emitted by the first frequency-modulated solid source 2 and the second frequency-modulated solid source 3 enter the detection channel detector 16, thereby causing the detection channel detector 16 to generate three detection channel beat frequency signals.

[0044] The telescope system specifically includes a convex lens 11 and a concave lens 12. The wavelength of the two frequency-modulated solid sources is 462 microns and the divergence is fast. The telescope system can keep the laser beam at a small diameter during the long propagation into the device to avoid excessive power loss.

[0045] The optical signals emitted by the two frequency-modulated solid sources are combined after passing through the polarization beam splitter 8. The combined light only needs to pass through the seventh beam splitter 14 along a single optical path, reducing the optical path structure setting. At the same time, the combined light passes through the plasma and is vertically reflected by the corner reflector 15 and enters the detection channel detector 16 after being reflected by the seventh beam splitter 14, avoiding the deviation of the two light beams during vertical reflection, thereby ensuring the stability of the light beam entering the detection channel detector 16.

[0046] This embodiment provides two frequency-modulated solid sources (a first frequency-modulated solid source 2 and a second frequency-modulated solid source 3) to form a solid source interferometer integrated device with a fixed-frequency solid source 1. Compared with the existing device consisting of one frequency-modulated solid source and a fixed-frequency solid source 1, it has the following advantages (a1) to (a5):

[0047] (a1) Increased measurement parameters: Compared with the original two-channel measurement, three difference frequency signals can be obtained by three-channel measurement. This means that during the fusion experiment, not only the density parameters can be obtained by calculation, but also the Faraday rotation angle parameters can be obtained, providing higher integrity for the experimental data.

[0048] (a2) Provide verification for experimental data: The three-channel construction introduces polarization signals, which can not only obtain Faraday rotation angle data, but also deduce the size and disturbance of the external magnetic field during the fusion experiment, which is of great significance for the stable operation of the experiment.

[0049] (a3) Multiple difference frequency adjustment: The three solid sources can be adjusted in pairs, allowing for more precise difference frequency distribution. If the experiment requires a higher density plasma, a higher difference frequency can be set to improve the measurement accuracy, thereby obtaining a higher temporal and spatial resolution.

[0050] (a4) Enhanced system reliability: When one frequency modulated solid source fails due to an accident, the entire system can still rely on the remaining two solid sources to operate normally, reducing system downtime.

[0051] (a5) Support for more measurement modes: The three solid source systems can run different measurement modes simultaneously or independently. For example, any number of the solid sources can be placed in the horizontal and vertical directions for measurement, which is very useful for fusion experiments in complex environments.

[0052] like Figure 3 As shown, the signals generated by the laser 1, the first frequency modulated solid source 2 and the second frequency modulated solid source 3 pass through the optical system, and after beam combination, enter the reference channel detector 7 and the detection channel detector 16. A part of the collected signal enters the phase comparator to calculate the plasma electron density and Faraday rotation angle in real time and output it, and the other part enters the spectrum analyzer for processing to obtain three different intermediate frequency signals (0.850MHz, 1.275MHz, 2.125MHz), and then the intermediate frequency signal and the power signal are transmitted to the host computer terminal. If the frequency difference between the fixed frequency solid source 1 and the first frequency modulated solid source 2 and the second frequency modulated solid source 3 does not meet the requirements, the frequency of the first frequency modulated solid source 2 and the second frequency modulated solid source 3 can be adjusted by the frequency control module of the host computer. The host computer can also start and shut down the main control module and the detector phase comparator module at a regular time, and record the data at the same time, which is also convenient for feedback of erroneous data and timely adjustment.

[0053] Modular control introduction: This embodiment uses the ESP8266 module as a remote module carrier to achieve remote communication, and communicates with the user end through the HTTP protocol to receive remote control instructions. Relay module: used to control the switch of electrical equipment, connected through the GPIO pin of ESP8266 and control the on and off of the power supply of the equipment. Current sensor module: used to detect whether the equipment is in operation. The current sensor ACS712 is connected to ESP8266 through the analog input pin to feedback the current value of the equipment, and then determine whether the equipment is running. Web server module: ESP8266 builds a web server inside to provide a user interface, present the current status of the equipment through a web page, and allow users to perform remote control operations. Control end: The host accesses the IP address of ESP8266 through a browser to achieve device switch control and operation status query.

[0054] Solution: By implementing a simple Web server and control logic on ESP8266, combined with relay modules and current sensor modules, remote control and status monitoring of the equipment can be completed. Its working principle and implementation method are as follows:

[0055] Network connection: ESP8266 connects to the user's LAN during system initialization, obtains network connection and assigns an IP address. The IP address of the device is output through the serial port, and the user can access the IP address through the browser to control it.

[0056] Receiving and executing control instructions: The user sends an HTTP request through a web page. After receiving the control request, ESP8266 controls the switch of the relay through the GPIO pin, thereby controlling the switch state of the solid state source. Relay control is achieved by setting a high level (turning on the device) or a low level (turning off the device).

[0057] Device status detection: ESP8266 continuously collects the current value of the device through the current sensor ACS712. By setting the appropriate voltage, current or power threshold, ESP8266 determines whether the device is in operation. Based on the detected data, ESP8266 returns the device's operating status to the Web server.

[0058] Web page display and feedback: The Web server dynamically displays the current status (on / off) and operating status (running / not running) of the device on the Web page. Users can view the status of the device in real time and perform remote control through the control buttons on the page.

[0059] System control flow:

[0060] (b1) The user accesses the IP address of ESP8266 through a browser and opens the web page.

[0061] (b2) The web page displays the current status and operating status of the device and provides control buttons.

[0062] (b3) The user clicks the "Turn on device" button, and ESP8266 controls the relay module switch to start the device and provide feedback on the device status.

[0063] (b4) When the user clicks the “Turn off device” button, ESP8266 controls the relay module to turn off the device and feedback the device status.

[0064] (b5) The system periodically reads the value of the current sensor and determines whether the device is running and returns the status to the user.

[0065] like Figure 4 The following is a simple connection diagram. ESP8266: As the core control unit, connected to the relay and current sensor. GPIO pin D1 is used to control the relay, and GPIO pin A0 is used to read the current sensor data. Relay module: Used to switch the solid-state source laser. The "IN" pin of the relay module receives the control signal (D1 pin) from the ESP8266. The normally open contact (NO) and common contact (COM) of the relay are used to control the power supply of the load device. Current sensor (ACS712): Used to detect the current of the load device and output current data to the analog input terminal (A0 pin) of the ESP8266. The current value is used to determine whether the load is in operation.

[0066] This embodiment achieves the compactness and stability of the system through a small and stable 650GHz solid source and a rationally laid out optical path design. An angle reflector is fixed on the window flange to return the detection optical path to its original path, avoiding the use of a large bracket. The integrated device not only supports vertical and horizontal position measurements, but can also be expanded to a multi-channel system to achieve multi-channel line-integrated electron density and Faraday rotation angle measurements. At the same time, the integrated device is also equipped with a remote control and monitoring module. The operator can remotely control the host module, detector phase comparator module, and frequency control module through the control terminal to control the operating parameters of the system. Finally, all system parameters are detected in real time through the data recording module to improve operating efficiency.

[0067] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A solid source polarization interferometer integrated device for a nuclear fusion experimental device, characterized in that: It comprises a fixed-frequency solid source (1), a first frequency-modulated solid source (2), a second frequency-modulated solid source (3), a polarization interferometer optical path system, a corner reflector (15), a reference track detector (7), and a detection track detector (16); The optical signal sent by the fixed-frequency solid source (1) is transmitted to the reference channel detector (7) and the detection channel detector (16) respectively through the polarization interferometer optical path system; A portion of the optical signal sent by the first frequency-modulated solid source (2) undergoes a change in polarization direction in the polarization interferometer optical path system, and is combined with the optical signal sent by the second frequency-modulated solid source (3) in the polarization interferometer optical path system to form a collinear beam, and the collinear light is converted into circularly polarized light. The circularly polarized light passes through the plasma and is transmitted to the corner reflector (15), and then enters the detection channel detector (16) after passing through the corner reflector (15); Another part of the optical signals sent by the first frequency-modulated solid source (2) and the second frequency-modulated solid source (3) pass through the polarization interferometer optical path system and enter the reference track detector (7).

2. The solid source polarization interferometer integrated device for a nuclear fusion experimental device according to claim 1, characterized in that: The reference track detector (7) is used to detect the optical signals sent by the fixed-frequency solid source (1), the first frequency-modulated solid source (2) and the second frequency-modulated solid source (3); The detection channel detector (16) is used to detect the optical signals sent by the fixed-frequency solid source (1), the first frequency-modulated solid source (2) and the second frequency-modulated solid source (3), so that the solid source polarization interferometer integrated device can calculate the plasma electron density and the Faraday rotation angle according to the combined beam signal.

3. The solid source polarization interferometer integrated device for a nuclear fusion experimental device according to claim 2, characterized in that: The polarization interferometer optical path system comprises a reference optical path and a detection optical path, and the reference optical path and the detection optical path share a part of the optical structure.

4. The solid source polarization interferometer integrated device for a nuclear fusion experimental device according to claim 3, characterized in that: The reference optical path comprises a first condenser lens (4-1), a second condenser lens (4-2), a third condenser lens (4-3), a 1 / 2 wave plate (22), a polarization beam splitter (8), a second beam splitter (5), a third beam splitter (6), a third reflector (20) and a sixth beam splitter (19); The optical signal transmitted by the fixed-frequency solid source (1) passes through the first condenser lens (4-1), the second beam splitter (5), and the third beam splitter (6) in sequence and enters the reference track detector (7); The optical signal transmitted by the first frequency modulated solid source (2) passes through the second condenser lens (4-2), the 1 / 2 wave plate (22), the polarization beam splitter (8), and the third beam splitter (6) in sequence and enters the reference track detector (7); The optical signal transmitted by the second frequency modulated solid source (3) passes through the third condenser lens (4-3), the third reflector (20), the sixth beam splitter (19), the polarization beam splitter (8), and the third beam splitter (6) in sequence and enters the reference track detector (7).

5. The solid source polarization interferometer integrated device for a nuclear fusion experimental device according to claim 4, characterized in that: The detection path optical path comprises a second reflector (17), a fourth beam splitter (18), a first reflector (9), a fifth beam splitter (10), a quarter wave plate (23), a telescope system, a fourth reflector (13) and a seventh beam splitter (14); The optical signal transmitted by the fixed-frequency solid source (1) passes through the first condenser lens (4-1), the second beam splitter (5), the second reflector (17), and the fourth beam splitter (18) in sequence and enters the detection channel detector (16); The optical signal transmitted by the first frequency modulated solid source (2) passes through the second focusing lens (4-2), the polarization beam splitter (8), the first reflector (9), the fifth beam splitter (10), the quarter wave plate (23), the telescope system, the fourth reflector (13), and the seventh beam splitter (14) in sequence, and then passes through the plasma and is transmitted to the corner reflector (15). After being reflected by the corner reflector (15), the optical signal passes through the seventh beam splitter (14) and the fourth beam splitter (18) in sequence and enters the detection channel detector (16); The optical signal transmitted by the second frequency modulated solid source (3) passes through the third condenser lens (4-3), the third reflector (20), the sixth beam splitter (19), the fifth beam splitter (10), the quarter wave plate (23), the telescope system, the fourth reflector (13), and the seventh beam splitter (14) in sequence, and then passes through the plasma and is transmitted to the corner reflector (15). After being reflected by the corner reflector (15), the optical signal passes through the seventh beam splitter (14) and the fourth beam splitter (18) in sequence and enters the detection channel detector (16).

6. The solid source polarization interferometer integrated device for a nuclear fusion experimental device according to claim 5, characterized in that: The optical signal sent by the first frequency-modulated solid source (2) and the optical signal sent by the second frequency-modulated solid source (3) are combined after passing through a polarization beam splitter (8) and are converted into circularly polarized signals after passing through a quarter wave plate (23).

7. The solid source polarization interferometer integrated device for a nuclear fusion experimental device according to claim 1, characterized in that: The fixed-frequency solid source (1) is a fixed-frequency 650 GHz solid source. The frequencies of the first frequency-modulated solid source (2) and the second frequency-modulated solid source (3) are different from each other. The difference between the first frequency-modulated solid source (2) and the fixed-frequency solid source (1) is +0.850 MHz, and the difference between the second frequency-modulated solid source (3) and the fixed-frequency solid source (1) is -1.275 MHz.

8. The solid source polarization interferometer integrated device for a nuclear fusion experimental device according to claim 1, characterized in that: Part of the data collected by the reference channel detector (7) and the detection channel detector (16) enters the phase comparator for real-time calculation to obtain the plasma electron density and the Faraday rotation angle and outputs them, and the other part enters the spectrum analyzer for processing to obtain three different intermediate frequency signals, and then transmits the intermediate frequency signal and the power signal to the host computer terminal.

9. The solid source polarization interferometer integrated device for a nuclear fusion experimental device according to claim 8, characterized in that: The frequency of the frequency modulated solid source is adjusted through the frequency control module of the host computer.

10. The solid source polarization interferometer integrated device for a nuclear fusion experimental device according to claim 1, characterized in that: The reference channel detector (7) and the detection channel detector (16) are field effect tube detectors.

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