High-voltage spark discharge plasma spectrum and temperature measurement device and method

Abstract

The present invention discloses a spectrum and temperature measurement device and method for high-voltage spark discharge plasma; the device includes a scanning camera, a high-resolution spectrometer, an optical lens, a DG535 digital delay generator, a high-voltage pulse power supply, and a needle-tip discharge device; the method includes using a 632.8nm helium-neon laser to calibrate the wavelength of the device; using the constructed device to detect the spectrum of the spark discharge plasma; using a radiation calibration light source halogen tungsten lamp to calibrate the radiation intensity of the device; and calculating the temperature of the spark discharge plasma. The present invention takes a scanning camera and a spectrometer as the core, combines Planck's blackbody radiation theory, and collects spark discharge spectra to achieve temperature diagnosis of discharge plasma. Compared with traditional optical pyrometers, both the range of the detection spectrum and the spectral resolution and time resolution of the temperature measurement system have been significantly improved.

Description

Technical Field

[0001] The invention relates to the technical fields of radiation temperature measurement and plasma spectrum analysis, in particular to a high-voltage spark discharge plasma spectrum and temperature measurement device and method. Background Art

[0002] Spark discharge is an instantaneous discharge phenomenon caused by the ionization and breakdown of a gas medium under the action of high voltage. Due to its advantages of concentrated energy, safe and easy control, and easy implementation, it is widely used in various industrial and scientific fields, such as explosive ignition of pyrotechnics, micro-machining of metal material surfaces, and engine driving. When analyzing the thermodynamic state parameters of discharge plasma, temperature is one of the most important parameters. By studying the temperature of spark discharge plasma, it is helpful to have a deep understanding of the basic physical process and energy conversion mechanism in the discharge process, which has important practical significance for improving the efficiency of EDM, reducing energy consumption, and optimizing material processing quality. At the same time, it also provides basic data for the effective ignition of pyrotechnics and the fine processing of metal surfaces. However, due to the small volume, large temperature gradient, many disturbance factors, extremely short duration, and violent plasma chemical reactions of spark discharge, the traditional contact temperature measurement method is difficult to apply. Because the contact method interferes with or destroys the integrity and thermodynamic state of the arc, resulting in distortion of the temperature field, and the measurement data is limited in time and space resolution. With the deepening of the research on spark discharge, it is found that its radiation spectrum data can effectively reflect the temperature changes during the discharge process. Therefore, analyzing the characteristics of discharge plasma by collecting spark discharge radiation spectra has been widely studied at home and abroad.

[0003] At present, optical pyrometers are usually used to realize temperature diagnosis of discharge plasma. This device is mainly composed of a photodiode or multiplier tube coupled with a limited number of narrow-band filters (bandwidth is about 10-30nm), and the temperature is deduced by recording the spectral intensity data of the measured target in each wavelength channel. However, since only filters with specific bandwidths are used, light intensity can only be collected in a specific wavelength channel each time it is measured, and the integral solution of the radiation intensity can only be completed within a wider band. Therefore, it is impossible to measure the spectral changes caused by changes in emissivity or characteristic spectral line luminescence, thereby introducing certain errors in the diagnosis of transient temperature. Therefore, it is particularly important to develop a high-voltage spark discharge plasma spectrum and temperature measurement technology with higher measurement accuracy. Summary of the invention

[0004] In order to solve the problems existing in the prior art, the purpose of the present invention is to provide a high-voltage spark discharge plasma spectrum and temperature measurement device and method, which can measure the transient spectrum and temperature change of the discharge plasma over time under different electrode gaps and voltage conditions. It is helpful to improve the efficiency of EDM, reduce energy consumption and optimize material processing quality, and provide basic data for the effective ignition of pyrotechnics, fine processing of metal surfaces and other research.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a high-voltage spark discharge plasma spectrum and temperature measurement device, including a scanning optical pyrometer system, the scanning optical pyrometer system including a scanning camera, a high-resolution spectrometer, an optical lens, a digital delay generator, a high-voltage pulse power supply and a pinpoint discharge device; the high-resolution spectrometer is arranged in front of the slit of the scanning camera, the anode of the pinpoint discharge device is externally connected to a high-voltage pulse power supply for charging, and the cathode is grounded; and the optical signal emitted by the pinpoint discharge device is focused to the high-resolution spectrometer through the optical lens, the high-voltage pulse power supply is used to control the discharge voltage and pulse width, output high-voltage pulses through a high-voltage transformer, and then drive the pulse transformer to provide a driving signal to the high-voltage switch; the scanning camera converts the optical signal into an electrical signal and provides ultrafast time resolution for the entire scanning optical pyrometer system, the digital delay generator is respectively connected to the scanning camera and the high-voltage pulse power supply to realize system synchronous triggering, and ensure that the spark discharge process is effectively recorded.

[0006] As a further improvement of the present invention, the high-resolution spectrometer includes an input slit, a blazed grating, a first spherical reflector, a second spherical reflector, a third spherical reflector and a fourth spherical reflector; the light signal emitted by the needle tip discharge device is focused to the input slit of the high-resolution spectrometer through an optical lens, and is input to the scanning camera after passing through the first spherical reflector, the second spherical reflector, the blazed grating, the third spherical reflector and the fourth spherical reflector in sequence.

[0007] As a further improvement of the present invention, the blazed grating is used to achieve spectral resolution of a scanning optical pyrometer system, and the specification of the blazed grating is 1200l p / mm.

[0008] As a further improvement of the present invention, the needle tip discharge device is fixed on a micrometer to accurately adjust the discharge electrode gap, and the needle tip discharge device is placed on a three-dimensional displacement platform to ensure that discharge information at different positions is collected.

[0009] As a further improvement of the present invention, the model of the digital delay generator is DG535 digital delay generator.

[0010] The present invention also provides a method for measuring the spectrum and temperature of a high-voltage spark discharge plasma, which is implemented by using the high-voltage spark discharge plasma spectrum and temperature measuring device as described above, and the method comprises the following steps:

[0011] Step 1: Use a 632.8nm helium-neon laser to calibrate the wavelength and establish the corresponding relationship between the spark discharge spectrum and the pixel points of the image collected by the camera;

[0012] Step 2, detecting the spectrum of the spark discharge plasma at different electrode gaps and voltages;

[0013] Step 3: Use a halogen tungsten lamp, a radiation calibration light source, to calibrate the radiation intensity of the temperature measuring device, and convert the spectral signal intensity collected by the scanning camera into spectral radiation brightness information necessary for calculating the temperature of the target object;

[0014] Step 4: After obtaining the discharge plasma wavelength and the corresponding spectral radiation brightness information, the temperature can be fitted by combining Planck's blackbody radiation formula.

[0015] As a further improvement of the present invention, the step 1 is specifically as follows:

[0016] The optical signal generated by the laser is transmitted to the high-resolution spectrometer through optical fiber, and then transmitted to the photocathode of the scanning camera by the high-resolution spectrometer. The output slit center wavelength is changed by adjusting the angle of the blazed grating inside the high-resolution spectrometer so that the laser can reach different positions of the photocathode, thereby obtaining the corresponding functional relationship between the wavelength and the CCD horizontal pixel.

[0017] As a further improvement of the present invention, the step 2 is specifically as follows:

[0018] The anode of the needle tip discharge device is charged and the discharge voltage is controlled by an external high-voltage pulse power supply, and a high-voltage pulse is output through a 1:4 high-voltage transformer; the spectrum of the discharge plasma at 5000V-10000V is detected under an electrode gap of 0.5mm, and the cathode of the needle tip discharge device is fixed on a micrometer so that the discharge gap can be freely adjusted according to the experimental requirements under the premise of ensuring high precision requirements. Then, under a voltage of 10000V, the spectrum of the discharge plasma at an electrode gap of 0.5mm-3mm is detected, and the discharge plasma spectrum intensity count recorded by the scanning optical pyrometer system is recorded as C T .

[0019] As a further improvement of the present invention, the step 3 is specifically as follows:

[0020] Place a halogen tungsten lamp, a calibration light source with known spectral radiation brightness data, at the pinpoint discharge device to ensure that the calibration optical path is completely consistent with the discharge experimental optical path, and the relevant parameters are set the same. The spectral intensity count of the calibration light source within a certain exposure time recorded by the camera is C s ; The output of the discharge plasma recorded on a single pixel is known to be C T =t T η T ∫ λ L(λ) T Φ(λ) T dλ, the output of the calibration light source on a single pixel is C s =t s η s ∫ λ L(λ) s Φ(λ) s dλ, where the subscripts T and S represent the spark discharge plasma and the radiation calibration light source respectively, L(λ) is the spectral radiance, t is the effective luminescence duration recorded by the temperature measurement system, C is the spectral intensity count recorded by the scanning camera, η represents the influencing factor related to the luminous area, the collection solid angle, the temperature measurement system gain and the camera slit width, Φ(λ) is the spectral response of the system; when the wavelength range experienced by a single pixel of the camera is very small, it can be approximated as follows: When the calibration optical path is exactly the same as the spark discharge experimental optical path, and the system configuration, that is, the gain of the scanning camera, the slit width and other factors remain the same, the optical transfer function is the same, that is, Φ(λ) T =Φ(λ) S , η T =η S ; The discharge plasma spectrum intensity count C detected by the scanning optical pyrometer system T Spectral intensity counting with calibrated light source C s Dividing by , we can get the discharge plasma spectrum radiation brightness: Among them, t T is the effective luminescence duration of the discharge plasma recorded in a single pixel, t S is the effective optical recording time of the radiation calibration light source, that is, the exposure time of the camera when detecting in the linear working area, L(λ) S The radiation brightness information of the known calibration light source can therefore be used to calculate the corresponding discharge plasma spectrum radiation brightness.

[0021] As a further improvement of the present invention, the step 4 is specifically as follows:

[0022] According to Planck's blackbody radiation formula The temperature calculation formula is: Where L is the spectral radiation brightness of the discharge plasma, λ is the wavelength, c is the speed of light in a vacuum, h is Planck's constant, k is the Boltzmann constant, and ε is the spectral emissivity. After obtaining the spectral radiation brightness corresponding to the discharge plasma at each wavelength, the change of its temperature over time under different voltages and electrode gaps can be obtained by fitting Planck's blackbody radiation formula.

[0023] The beneficial effects of the present invention are:

[0024] (1) The non-contact temperature measurement method is used to realize the temperature diagnosis of spark discharge plasma, which will not interfere with or destroy the integrity and thermodynamic state of the arc, and provides higher temperature measurement accuracy and response speed;

[0025] (2) The scanning camera is used as the photoelectric detection device of the entire system, which greatly improves the time resolution of the system. It also has excellent spatial resolution and can effectively identify tiny electrode gaps, thereby achieving more accurate temperature detection;

[0026] (3) Using a high-resolution spectrometer as the spectroscopic system, and the internal grating provides the spectral resolution of the entire system. Compared with the traditional single-channel or multi-channel optical pyrometer diagnostic method, the detection spectrum range and spectral resolution capabilities are greatly improved, which increases the reliability of the data and improves the accuracy of the temperature;

[0027] (4) The detection of the transient spectrum and temperature of spark discharge plasma under different electrode gaps and voltages is realized, which helps to gain a deeper understanding of the basic physical process and energy conversion mechanism in the discharge process, which has important practical significance for improving the efficiency of EDM, reducing energy consumption and optimizing material processing quality. It also provides basic data for the effective ignition of pyrotechnics and the fine processing of metal surfaces. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A structural diagram of a spark discharge plasma spectrum and temperature measurement device constructed for an embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of the change of the spectrum of the spark discharge at various voltages with time when the gap is 0.5 mm, detected by the device constructed by the embodiment of the present invention;

[0030] Figure 3 This is a schematic diagram of the change of the spectrum of the spark discharge at each electrode gap with time when the voltage is 10000V detected by the device built by the embodiment of the present invention;

[0031] Figure 4 A schematic diagram showing the change of discharge plasma temperature over time at various voltages calculated in an embodiment of the present invention;

[0032] Figure 5 Schematic diagram of the change of discharge plasma temperature over time at each electrode gap calculated according to an embodiment of the present invention. DETAILED DESCRIPTION

[0033] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0034] Example

[0035] like Figure 1 As shown, this embodiment is used to measure the transient spectrum and temperature change of spark discharge plasma under different voltages and electrode gaps over time. The specific diagnostic method and calculation steps are as follows:

[0036] A high-voltage spark discharge plasma spectrum and temperature measuring device comprises a scanning camera 1, a high-resolution spectrometer 2, an optical lens 3, a DG535 digital delay generator 4, a high-voltage pulse power supply 5, and a needle tip discharge device 6 which are sequentially arranged to form a scanning optical pyrometer system. The high-resolution spectrometer 2 includes an input slit 21, a blazed grating 24, a first spherical reflector 22, a second spherical reflector 23, a third spherical reflector 25 and a fourth spherical reflector 26. In actual measurement, the high-resolution spectrometer 2 needs to be placed in front of the slit of the scanning camera 1, and the grating 24 inside it is used to realize the spectral resolution of the entire system. The specification of the grating 24 is 1200l p / mm, which ensures the excellent spectral resolution ability of the system. The anode of the needle tip discharge device 6 is externally connected to the high-voltage pulse power supply 5 for charging, and the cathode is grounded. At the same time, it is fixed on the micrometer 61, so that the discharge electrode gap can be accurately adjusted. The entire discharge device is placed on the three-dimensional displacement stage 62 to ensure that the discharge information at different positions can be collected. During measurement, the light signal emitted by the needle tip discharge device 6 is focused to the input slit 21 of the spectrometer through the optical lens 3. The high-voltage pulse power supply 5 controls the discharge voltage and pulse width, and outputs high-voltage pulses through a 1:4 high-voltage transformer. The trigger frequency and pulse width of the spark are determined by the internal drive chip input signal, and then the pulse transformer is driven to provide a drive signal to the high-voltage switch. The scanning camera 1 converts the optical signal into an electrical signal and provides ultrafast time resolution for the entire system. The DG535 digital delay generator 4 is respectively connected to the scanning camera 1 and the high-voltage pulse power supply 5 to achieve system synchronous triggering and ensure that the spark discharge process can be effectively recorded.

[0037] Using the above device, the high voltage spark discharge plasma spectrum and temperature measurement method is as follows:

[0038] Step 1: Use a 632.8nm helium-neon laser to calibrate the wavelength of the constructed device and establish the corresponding relationship between the spark discharge spectrum and the pixel points of the image collected by the camera. The specific steps are as follows: The light signal generated by the laser is transmitted to the spectrometer 2 through an optical fiber, and then transmitted from the spectrometer 2 to the photocathode of the scanning camera 1. The output slit center wavelength is changed by adjusting the grating angle inside the spectrometer 2 so that the laser can reach different positions of the photocathode, thereby obtaining the corresponding functional relationship between the wavelength and the CCD horizontal pixel.

[0039] Step 2, using the constructed device to detect the spectrum of spark discharge plasma: the anode of the needle discharge device 6 is charged and the discharge voltage is controlled by the external high-voltage pulse power supply 5, and the high-voltage pulse is output through a 1:4 high-voltage transformer. In order to explore the influence of the voltage at both ends of the electrode on the spark discharge characteristics, the spectrum of the discharge plasma at 5000V-10000V is detected under a 0.5mm electrode gap. The results are as follows Figure 2 In order to explore the influence of electrode gap width on spark discharge characteristics, the cathode of the needle tip discharge device 6 is fixed on the micrometer 61, so that the discharge gap can be freely adjusted according to experimental requirements under the premise of ensuring high precision requirements. Then, under the voltage condition of 10000V, the spectrum of the discharge plasma with an electrode gap of 0.5mm-3mm is detected. The results are shown in Figure 3 The discharge plasma spectrum intensity count recorded by the temperature measurement system is recorded as C T .

[0040] Step 3, use the radiation calibration light source halogen tungsten lamp to calibrate the radiation intensity of the constructed device. The specific steps are: place the calibration light source halogen tungsten lamp with known spectral radiation brightness data at the pinpoint discharge device 6, ensure that the calibration light path and the discharge experiment light path are completely consistent, and the system related parameters are set the same. The spectral intensity count of the calibration light source within a certain exposure time recorded by the camera is C s It is known that the output of the discharge plasma recorded by the system on a single pixel is C T =t T η T ∫ λ L(λ) T Φ(λ) T dλ, the output of the calibration light source on a single pixel is C s =t s η s ∫ λ L(λ) s Φ(λ) sdλ, where the subscripts T and S represent the spark discharge plasma and the radiation calibration light source, respectively, C is the spectral intensity count recorded by the CCD, L(λ) is the spectral radiance, t is the effective luminescence duration recorded by the temperature measurement system, η is an influencing factor related to the luminous area, the collection solid angle, the temperature measurement system gain and the camera slit width, and Φ(λ) is the spectral response of the system. When the wavelength range experienced by a single pixel of the camera is very small, the following approximation can be made: When the calibration optical path is exactly the same as the spark discharge experimental optical path, and the system configuration, that is, the camera gain, slit width and other factors remain the same, the optical transfer function is the same, that is, Φ(λ) T =Φ(λ) S , η T =η S The discharge plasma spectrum intensity count C detected by the system T Spectral intensity counting with calibrated light source C s Dividing by , we can get the discharge plasma spectrum radiation brightness: Among them, t T It is the effective luminescence duration recorded by a single pixel of the discharge plasma. In actual measurement, it can be determined by dividing the time window corresponding to the range selected by the scanning camera by the number of CCD pixels scanned by the entire image. S The effective optical recording time of the radiation calibration light source is the exposure time of the camera when detecting in the linear working area. L(λ) S The radiation brightness information of the known calibration light source can therefore be used to calculate the corresponding discharge plasma spectrum radiation brightness.

[0041] Step 4: Calculate the temperature change of spark discharge plasma under different voltage and electrode gap conditions: According to Planck's blackbody radiation formula The temperature calculation formula is: Where L is the spectral radiation brightness of the discharge plasma, λ is the wavelength, c is the speed of light in a vacuum, h is Planck's constant, k is the Boltzmann constant, and ε is the spectral emissivity. After obtaining the spectral radiation brightness corresponding to the discharge plasma at each wavelength, the temperature change over time under different voltages and electrode gaps can be obtained by fitting Planck's blackbody radiation formula, such as Figure 4 and Figure 5 It should be noted that when fitting the temperature, it is necessary to avoid the characteristic spectrum segments with strong luminescence characteristics to ensure the accuracy and reliability of temperature measurement.

[0042] The above-mentioned embodiments only express the specific implementation of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A method for measuring spectrum and temperature of high voltage spark discharge plasma, characterized in that: The high-voltage spark discharge plasma spectrum and temperature measurement device is used for realization. The device includes a scanning optical pyrometer system, which includes a scanning camera, a high-resolution spectrometer, an optical lens, a digital time delay generator, a high-voltage pulse power supply and a pinpoint discharge device. The high-resolution spectrometer is arranged in front of the slit of the scanning camera, the anode of the pinpoint discharge device is externally connected to a high-voltage pulse power supply for charging, and the cathode is grounded. The optical signal emitted by the pinpoint discharge device is focused to the high-resolution spectrometer through the optical lens. The high-voltage pulse power supply is used to control the discharge voltage and pulse width, output high-voltage pulses through a high-voltage transformer, and then drive the pulse transformer to provide a driving signal to the high-voltage switch. The scanning camera converts the optical signal into an electrical signal and provides ultrafast time resolution for the entire scanning optical pyrometer system. The digital time delay generator is respectively connected to the scanning camera and the high-voltage pulse power supply to realize system synchronous triggering and ensure that the spark discharge process is effectively recorded. The method comprises the following steps: Step 1: Use a 632.8nm helium-neon laser to calibrate the wavelength and establish the corresponding relationship between the spark discharge spectrum and the pixel points of the image collected by the camera; Step 2, detecting the spectrum of the spark discharge plasma at different electrode gaps and voltages; Step 3: Use a halogen tungsten lamp, a radiation calibration light source, to calibrate the radiation intensity of the temperature measuring device, and convert the spectral signal intensity collected by the scanning camera into spectral radiation brightness information necessary for calculating the temperature of the target object; Step 4: After obtaining the discharge plasma wavelength and the corresponding spectral radiation brightness information, the temperature can be fitted by combining Planck's blackbody radiation formula.

2. The high voltage spark discharge plasma spectrum and temperature measurement method according to claim 1, characterized in that: The step 1 is specifically as follows: The optical signal generated by the laser is transmitted to the high-resolution spectrometer through optical fiber, and then transmitted to the photocathode of the scanning camera by the high-resolution spectrometer. The output slit center wavelength is changed by adjusting the angle of the blazed grating inside the high-resolution spectrometer so that the laser can reach different positions of the photocathode, thereby obtaining the corresponding functional relationship between the wavelength and the CCD horizontal pixel.

3. The high voltage spark discharge plasma spectrum and temperature measurement method according to claim 2, characterized in that: The step 2 is specifically as follows: The anode of the needle tip discharge device is charged and the discharge voltage is controlled by an external high-voltage pulse power supply, and a high-voltage pulse is output through a 1:4 high-voltage transformer; the spectrum of the discharge plasma at 5000V-10000V is detected under an electrode gap of 0.5mm, and the cathode of the needle tip discharge device is fixed on a micrometer so that the discharge gap can be freely adjusted according to the experimental requirements under the premise of ensuring high precision requirements. Then, under a voltage of 10000V, the spectrum of the discharge plasma at an electrode gap of 0.5mm-3mm is detected, and the discharge plasma spectrum intensity count recorded by the scanning optical pyrometer system is recorded as C T .

4. The high-voltage spark discharge plasma spectrum and temperature measurement method according to claim 3, characterized in that: The step 3 is as follows: Place a halogen tungsten lamp, a calibration light source with known spectral radiation brightness data, at the pinpoint discharge device to ensure that the calibration optical path is completely consistent with the discharge experimental optical path, and the relevant parameters are set the same. The spectral intensity count of the calibration light source within a certain exposure time recorded by the camera is C s ; The output of the discharge plasma recorded on a single pixel is known to be C T =t T η T ∫ λ L(λ) T Φ(λ) T dλ, the output of the calibration light source on a single pixel is C s =t s η s ∫ λ L(λ) s Φ(λ) s dλ, where the subscripts T and S represent the spark discharge plasma and the radiation calibration light source respectively, L(λ) is the spectral radiance, t is the effective luminescence duration recorded by the temperature measurement system, C is the spectral intensity count recorded by the scanning camera, η represents the influencing factor related to the luminous area, the collection solid angle, the temperature measurement system gain and the camera slit width, Φ(λ) is the spectral response of the system; when the wavelength range experienced by a single pixel of the camera is very small, it can be approximated as follows: When the calibration optical path is exactly the same as the spark discharge experimental optical path, and the system configuration, that is, the gain of the scanning camera, the slit width and other factors remain the same, the optical transfer function is the same, that is, Φ(λ) T =Φ(λ) S , η T =η S ; The discharge plasma spectrum intensity count C detected by the scanning optical pyrometer system T Spectral intensity counting with calibrated light source C s Dividing by , we can get the discharge plasma spectrum radiation brightness: Among them, t T is the effective luminescence duration of the discharge plasma recorded in a single pixel, t S is the effective optical recording time of the radiation calibration light source, that is, the exposure time of the camera when detecting in the linear working area, L(λ) S The radiation brightness information of the known calibration light source can therefore be used to calculate the corresponding discharge plasma spectrum radiation brightness.

5. The high voltage spark discharge plasma spectrum and temperature measurement method according to claim 4, characterized in that: The step 4 is specifically as follows: According to Planck's blackbody radiation formula The temperature calculation formula is: Where L is the spectral radiation brightness of the discharge plasma, λ is the wavelength, c is the speed of light in a vacuum, h is Planck's constant, k is the Boltzmann constant, and ε is the spectral emissivity. After obtaining the spectral radiation brightness corresponding to the discharge plasma at each wavelength, the change of its temperature over time under different voltages and electrode gaps can be obtained by fitting Planck's blackbody radiation formula.

6. The high voltage spark discharge plasma spectrum and temperature measurement method according to claim 1, characterized in that: The high-resolution spectrometer comprises an input slit, a blazed grating, a first spherical reflector, a second spherical reflector, a third spherical reflector and a fourth spherical reflector; the light signal emitted by the needle tip discharge device is focused to the input slit of the high-resolution spectrometer through an optical lens, and is input to the scanning camera after passing through the first spherical reflector, the second spherical reflector, the blazed grating, the third spherical reflector and the fourth spherical reflector in sequence.

7. The high voltage spark discharge plasma spectrum and temperature measurement method according to claim 6, characterized in that: The blazed grating is used to achieve spectral resolution of a scanning optical pyrometer system, and the specification of the blazed grating is 1200 lp / mm.

8. The high voltage spark discharge plasma spectrum and temperature measurement method according to claim 1 or 7, characterized in that: The needle tip discharge device is fixed on a micrometer and is used to accurately adjust the discharge electrode gap. The needle tip discharge device is placed on a three-dimensional displacement platform to ensure that discharge information at different positions is collected.

9. The high voltage spark discharge plasma spectrum and temperature measurement method according to claim 1, characterized in that: The model of the digital delay generator is DG535 digital delay generator.

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