Liquid cathode glow discharge ignition method for starting by using liquid level height of measured sample

Abstract

The invention discloses a liquid cathode glow discharge ignition method for performing glow starting by utilizing the liquid level height of a measured sample. The method comprises the following working steps: applying a glow starting voltage, extracting and beating out the sample, increasing the height of a liquid water column, monitoring a glow starting current and maintaining stable glow. The invention relates to the technical field of atomic spectrum analysis, and has the beneficial effects that the pressure intensity and humidity of an experimental environment are precisely regulated and controlled through a precise regulator, so that the stability of glow discharge is guaranteed; the injection pump accurately controls the water sample flow and the conveying speed to ensure that the water sample is stably sprayed into the well-designed capillary tube to form a stable electric field; the propelling speed of the injection pump is increased at a constant speed, the height of a liquid water column is gradually increased, and when the distance between the anode rod and the water column is reduced to be smaller than the starting distance, ignition starting is smoothly completed.

Description

Technical Field

[0001] The invention relates to the technical field of atomic spectrum analysis, in particular to a liquid cathode glow discharge ignition method which utilizes the liquid level height of a measured sample for ignition. Background Art

[0002] Existing liquid cathode glow discharge ignition devices present several pressing challenges. Traditional fixed-starting voltage devices rely on moving parts to adjust the distance between the cathode and anode to achieve ignition. This increases the complexity of the device structure and the presence of moving parts, leading to a relatively high failure rate and compromising the device's stability and reliability. Devices with a fixed anode-cathode spacing, while relatively simple in structure, require starting voltages ranging from several thousand to tens of thousands of volts. This places extremely high demands on the reliability of the electronic control components and increases safety risks. Furthermore, compared to similar patents, some devices utilize peristaltic pumps to form the plasma. However, the uneven flow rate of the peristaltic pump can lead to high liquid instability and even the possibility of liquid spraying onto the anode, thus affecting the ignition effect. Other devices utilize moving parts to adjust the distance between the cathode and anode to achieve ignition, but this approach also presents challenges with wear and vibration of the moving parts, potentially affecting the device's accuracy and lifespan over time. In light of these issues, in-depth research has been conducted to address these issues, leading to the present case. Summary of the Invention

[0003] The technical solution of the present invention to achieve the above-mentioned object is as follows: The technical solution of the present invention to achieve the above-mentioned object is as follows: A liquid cathode glow discharge ignition method using the liquid level height of the sample to be measured for ignition, comprising the following working steps: applying a ignition voltage, extracting and ejecting the sample, increasing the height of the liquid water column, monitoring the ignition current, and maintaining a stable glow; Applying the starting voltage: The starting power supply applies a starting voltage of about 700V between the anode rod and the cathode rod; Extract and eject the sample: Start the syringe pump to extract the sample from the water sample, and then eject the liquid sample through the capillary in the cathode rod; Increase the height of the liquid water column: uniformly increase the injection pump's discharge speed to gradually increase the height of the liquid water column; when the distance between the anode rod and the water column is reduced to less than the starting distance, ignition will be successful; Monitoring the ignition current: When the syringe pump is pumping out the sample, the current between the anode rod and the cathode rod needs to be monitored in real time; when the current reaches the set value, it can be considered that the ignition is successful; Maintaining a stable glow: After successful ignition, the injection pump speed needs to be uniformly reduced to increase the distance between the anode rod and the water column. When the distance reaches the appropriate distance, the injection pump speed needs to be kept constant to maintain a stable glow discharge. A liquid cathode glow discharge ignition device for ignition using the liquid level height of a measured sample, applied to the above-mentioned liquid cathode glow discharge ignition method for ignition using the liquid level height of a measured sample, comprises: a detection bracket, an anode rod is provided at the top end of the detection bracket, a cathode rod is provided at the bottom end of the detection bracket, the cathode rod is directly opposite to the bottom end of the anode rod, a liquid level regulator is provided on the cathode rod, and a ignition high-voltage source is provided on the anode rod and the cathode rod.

[0004] Preferably, the liquid level regulator includes a capillary tube, the capillary tube is inserted into the inner side of the cathode rod, a water sample bottle is provided on the detection bracket, and a three-way valve is provided between the water sample bottle and the capillary tube.

[0005] Preferably, the three-way valve is provided with a syringe pump.

[0006] Preferably, a plurality of sealing plates are provided on the detection bracket.

[0007] Preferably, a pressure sensor and a humidity sensor are provided between the detection bracket and the plurality of sealing plates, and a humidity regulator and a pressure regulator are provided on the detection bracket.

[0008] Preferably, the gas pressure and temperature parameters between the anode rod and the cathode rod are precisely controlled.

[0009] Preferably, the viscosity and surface tension of the water sample to be tested are first checked.

[0010] A liquid cathode glow discharge ignition method for ignition using the liquid level height of a sample to be tested is produced using the technical solution of the present invention. The pressure and humidity of the experimental environment are precisely controlled by a precision regulator to ensure the stability of the glow discharge. The injection pump accurately controls the flow rate and delivery speed of the water sample to ensure that the water sample is stably sprayed into a carefully designed capillary to form a stable electric field. The injection pump propulsion rate is uniformly increased to gradually increase the height of the liquid water column. When the distance between the anode rod and the water column is reduced to below the ignition distance, ignition and ignition are successfully completed. Real-time monitoring of the current ensures successful ignition, and then the injection pump propulsion rate is gradually reduced to maintain discharge stability. This method has no mechanical moving parts, thus avoiding wear and vibration. The ignition voltage is less than 1KV, and the electrode spacing is flexible to adjust, making it easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 The figure is a three-dimensional cross-sectional schematic diagram of a liquid cathode glow discharge ignition method for starting the ignition by utilizing the liquid level height of the sample to be measured according to the present invention.

[0012] Figure 2 This is a three-dimensional schematic diagram of a liquid cathode glow discharge ignition method for starting the glow using the liquid level height of the sample being measured, as described in the present invention.

[0013] Figure 3 This is a schematic diagram of a main cross-section of a liquid cathode glow discharge ignition method for starting the glow using the liquid level height of a measured sample as described in the present invention.

[0014] In the figure: 1. Detection bracket; 2. Anode rod; 3. Cathode rod; 4. Capillary; 5. Water sample bottle; 6. Three-way valve; 7. Syringe pump. DETAILED DESCRIPTION

[0015] The present invention will be described in detail below with reference to the accompanying drawings. See also Figure 1-3 Existing liquid cathode glow discharge ignition equipment has numerous shortcomings. Traditional fixed-start voltage devices rely on moving parts to adjust the electrode spacing, resulting in complex structures, high failure rates, and poor stability. Fixed-spacing devices, while simplified in structure, require starting voltages ranging from several thousand to tens of thousands of volts, placing extremely high demands on the reliability of electronic control components and posing significant safety risks. Furthermore, some devices use peristaltic pumps to form plasma, but uneven flow rates cause liquid level fluctuations and even splashing onto the anode, affecting ignition. Other devices achieve ignition by varying the electrode spacing through moving parts, but these suffer from wear and vibration issues, affecting accuracy and lifespan over time.

[0016] Therefore, the present application protects the liquid level height adjustment type ignition discharge method. First, the collected water sample is carefully monitored, which includes a strict inspection of its viscosity and surface tension. Viscosity and surface tension are important factors affecting the flow characteristics of the liquid in the capillary 4. By accurately measuring these physical properties, the behavior of the water sample during transportation can be predicted, thereby optimizing the experimental parameters. After the test is completed, the water sample is properly placed inside a special water sample bottle 5. This can ensure the stability of the water sample during storage and transportation, and avoid external factors from interfering with the properties of the water sample. Next, by detecting the gap between the bracket 1 and the sealing plate, The precision humidity regulator and pressure regulator in the room are used to accurately control the parameters such as pressure and humidity of the experimental environment; these environmental parameters have an important influence on the stability and efficiency of glow discharge, so they must be strictly controlled within their appropriate range. After everything is ready, start the injection pump 7 to transport the water sample; the injection pump 7 is connected to the inside of the water sample bottle 5 through the three-way valve 6, which can accurately control the flow rate and transportation speed of the water sample; under the action of the injection pump 7, the water sample is drained into the capillary 4; the inner diameter of the capillary 4, as a key component for liquid transportation, is carefully designed to ensure that the water sample can flow along the inner side of the cathode rod 3. Spray upward at a stable and controllable speed; this spraying process not only provides the necessary liquid medium for the subsequent glow discharge, but also helps to form a stable electric field environment through its uniform spraying effect, creating favorable conditions for the triggering and maintenance of glow discharge; by uniformly increasing the propulsion rate of the injection pump 7, the height of the liquid water column is gradually increased; as the distance between the anode rod 2 and the water column gradually decreases, when this distance is reduced to below the starting distance, the ignition and starting process is successfully completed; during the process of the injection pump 7 continuously outputting the sample, the current between the anode rod 2 and the cathode rod 3 needs to be monitored in real time; a Once the current value reaches the preset threshold, it indicates that the ignition process has been successfully completed. Subsequently, in order to maintain the stability of the discharge, the propulsion rate of the injection pump 7 needs to be gradually reduced, thereby appropriately increasing the distance between the anode rod 2 and the water column. When the distance between the anode rod 2 and the water column is adjusted to an appropriate range, the propulsion rate of the injection pump 7 needs to be maintained stable to ensure the continuous stability of the glow discharge. There are no mechanical moving parts to avoid wear and vibration. The ignition power supply does not require a very high voltage to successfully ignite, and the ignition voltage is less than 1KV. The pumping speed of the injection pump 7 is controllable, the height of the water column is variable, and the spacing between the electrodes does not need to be very precise and is easy to adjust. In summary, the water sample is meticulously monitored, including rigorous checks of viscosity and surface tension, to optimize experimental parameters and ensure sample stability during transport. The sample is securely placed inside a custom-designed sample bottle 5 to prevent external interference. The pressure and humidity of the experimental environment are precisely controlled by a precision regulator, effectively ensuring the stability and efficiency of the glow discharge. A syringe pump 7 precisely controls the sample flow rate and delivery speed, connecting to the sample bottle 5 via a three-way valve 6 to ensure a stable spray of the sample into the capillary tube 4. The capillary tube 4's carefully designed inner diameter ensures that the sample sprays upward along the inner side of the cathode rod 3 at a steady and controllable rate, creating a stable electric field environment. By uniformly increasing the syringe pump 7's propulsion rate, the height of the liquid column gradually increases. When the distance between the anode rod 2 and the water column decreases to below the starting distance, ignition is successfully completed. Real-time monitoring of the current between the anode rod 2 and cathode rod 3 ensures successful ignition. Then, the propulsion rate of the injection pump 7 is gradually reduced to maintain discharge stability. This method has no mechanical moving parts, avoiding wear and vibration problems. The starting power supply does not require extremely high voltage, and the starting voltage is less than 1KV. The pumping speed of the injection pump 7 is controllable, the water column height is variable, the electrode spacing is flexibly adjusted, and it is easy to operate.

[0017] The above technical solutions only reflect the preferred technical solutions of the technical solutions of the present invention. Any changes that may be made to certain parts thereof by those skilled in the art all reflect the principles of the present invention and fall within the scope of protection of the present invention.

Claims

1. A liquid cathode glow discharge ignition method utilizing the liquid level of a sample to be measured for ignition, comprising the following steps: applying an ignition voltage, extracting and ejecting a sample, increasing the height of the liquid water column, monitoring the ignition current, and maintaining a stable glow; Applying the starting voltage: The starting power supply applies a starting voltage of about 700V between the anode rod and the cathode rod; Extract and eject the sample: Start the syringe pump to extract the sample from the water sample, and then eject the liquid sample through the capillary in the cathode rod; Increase the height of the liquid water column: uniformly increase the injection pump's discharge speed to gradually increase the height of the liquid water column; when the distance between the anode rod and the water column is reduced to less than the starting distance, ignition will be successful; Monitoring the ignition current: When the syringe pump is pumping out the sample, the current between the anode rod and the cathode rod needs to be monitored in real time; when the current reaches the set value, it can be considered that the ignition is successful; Maintaining a stable glow: After successful ignition, the injection pump speed needs to be uniformly reduced to increase the distance between the anode rod and the water column. When the distance reaches the appropriate distance, the injection pump speed needs to be kept constant to maintain a stable glow discharge. A liquid cathode glow discharge ignition device for starting the ignition using the liquid level of a sample to be measured, applied to the above-mentioned liquid cathode glow discharge ignition method for starting the ignition using the liquid level of a sample to be measured, comprising: A detection bracket is provided with an anode rod at the top end of the detection bracket, a cathode rod is provided at the bottom end of the detection bracket, the cathode rod is directly opposite to the bottom end of the anode rod, a liquid level regulator is provided on the cathode rod, and a ignition high-voltage source is provided on the anode rod and the cathode rod.

2. The liquid cathode glow discharge ignition device according to claim 1, wherein the ignition is started by using the liquid level of the sample to be measured, The liquid level regulator includes a capillary tube, which is inserted into the inner side of the cathode rod. A water sample bottle is provided on the detection bracket, and a three-way valve is provided between the water sample bottle and the capillary tube.

3. The liquid cathode glow discharge ignition device according to claim 2, wherein the device is characterized in that: The three-way valve is provided with a syringe pump.

4. The liquid cathode glow discharge ignition device according to claim 2, wherein the device is characterized in that: A plurality of sealing plates are provided on the detection bracket.

5. The liquid cathode glow discharge ignition device according to claim 4, wherein the device is characterized in that: A pressure sensor and a humidity sensor are provided between the detection bracket and the plurality of sealing plates, and a humidity regulator and a pressure regulator are provided on the detection bracket.

6. The liquid cathode glow discharge ignition method according to claim 1, wherein the method comprises: The method is achieved by precisely controlling the gas pressure and temperature parameters between the anode rod and the cathode rod.

7. The liquid cathode glow discharge ignition method according to claim 1, wherein the method comprises: The water sample to be tested is first subjected to viscosity and surface tension inspection.

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