CN116822248A - Parameter design method of flight time mass spectrum device - Google Patents

Parameter design method of flight time mass spectrum device Download PDF

Info

Publication number
CN116822248A
CN116822248A CN202311064561.3A CN202311064561A CN116822248A CN 116822248 A CN116822248 A CN 116822248A CN 202311064561 A CN202311064561 A CN 202311064561A CN 116822248 A CN116822248 A CN 116822248A
Authority
CN
China
Prior art keywords
pole piece
flight
cylinder
region
reflection
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202311064561.3A
Other languages
Chinese (zh)
Other versions
CN116822248B (en
Inventor
王堉伦
李嫣然
赵庆会
马乔
孙运
娄建秋
张永锋
李刚
刘立鹏
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hangzhou Puyu Technology Development Co Ltd
Original Assignee
Hangzhou Puyu Technology Development Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hangzhou Puyu Technology Development Co Ltd filed Critical Hangzhou Puyu Technology Development Co Ltd
Priority to CN202311064561.3A priority Critical patent/CN116822248B/en
Publication of CN116822248A publication Critical patent/CN116822248A/en
Application granted granted Critical
Publication of CN116822248B publication Critical patent/CN116822248B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/10—Geometric CAD
    • G06F30/17—Mechanical parametric or variational design
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
    • G06F2119/12—Timing analysis or timing optimisation

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Geometry (AREA)
  • General Physics & Mathematics (AREA)
  • Evolutionary Computation (AREA)
  • General Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Computational Mathematics (AREA)
  • Mathematical Analysis (AREA)
  • Mathematical Optimization (AREA)
  • Pure & Applied Mathematics (AREA)
  • Other Investigation Or Analysis Of Materials By Electrical Means (AREA)

Abstract

The embodiment of the specification discloses a parameter design method of a time-of-flight mass spectrometry device. The method is applied to a time-of-flight mass spectrometry device with an electrode in a reflection area, an adjustable reflection base position and an adjustable relative distance between a detector and an acceleration area, and comprises the following steps: loading the initial parameters into a time-of-flight mass spectrometry device to obtain an effective flight path length of an ion, and calculating the effective flight path length of the ion based on the initial parameters, the structure and voltage parameters of an acceleration region, and the mass-to-charge ratio of the ion; calculating the effective flight path length of the same ion under the target resolution based on the proportional relation of the initial resolution and the effective flight path length thereof; parameter adjustment, obtaining effective flight path length equivalent to effective flight path length under target resolution; parameters include the distance of the detector relative to the acceleration zone, the field free region and the reflection zone, the relative positions of the adjacent reflection zone, the reflection pedestal and the reflection zone, the voltages applied to the field free region and the reflection zone.

Description

Parameter design method of flight time mass spectrum device
Technical Field
One or more embodiments of the present disclosure relate to the field of mass spectrometry device detection technology, and in particular, to a method of parameter design for a time-of-flight mass spectrometry device.
Background
A time-of-flight mass spectrometry device (TOF) is the fastest mass spectrometer with high resolving power that facilitates qualitative and m/z (mass to charge ratio) approximate ion discrimination.
Existing time-of-flight mass spectrometry devices typically have only one set of fixed flight structure models. When designing parameters of a mass spectrometer device, due to the fixed flight structure model, the relative positions of electrodes in the structure are not required to be considered, but only voltage parameters are required to be considered (for example, the invention patent application CN202011291559.6, "method, device, terminal and storage medium for correcting mass spectrum voltage parameters in real time"). Therefore, the designed time-of-flight mass spectrometry device can only realize one ion flight path and cannot meet the resolution requirements in various occasions.
When multiple resolutions are required, multiple time-of-flight mass spectrometry devices need to be designed. During design, a specific parameter design is required for the flight structure model in each time-of-flight mass spectrometry device. Since the parameters involve multidimensional variables, the calculation is huge. Even though the structural arrangement of the flight structure models in the two time-of-flight mass spectrometry devices is similar, the difference is the relative position and voltage parameters of the electrodes, and considering the difference among the devices and ensuring that each time-of-flight mass spectrometry device has accurate resolution, each time-of-flight mass spectrometry device still needs to perform complete parameter calculation when being designed.
The invention patent application CN 202211191250.9 provides a parameter design method of a time-of-flight mass spectrometer for the calculation of the multidimensional variable. Although the method can calculate and obtain the parameters under the high resolution by using the mathematical model, the method designs the parameters of the flight structure model under one resolution each time, which means that when the parameters of the flight structure model under the other resolution are required to be obtained, the calculation process is still required to be repeated, and the calculation is complicated and inefficient.
Disclosure of Invention
One or more embodiments of the present specification describe methods of parameter design of a time-of-flight mass spectrometry apparatus that aim to address one or more of the above problems, as well as other potential problems.
In a first aspect, embodiments of the present disclosure provide a method for designing parameters of a time-of-flight mass spectrometry device, where the method is applied to a time-of-flight mass spectrometry device in which positions of an electrode and a reflection base in a reflection region are adjustable, and a relative distance between a detector and an acceleration region is adjustable; the method comprises the following steps:
setting initial parameters for the time-of-flight mass spectrometry device, wherein the initial parameters comprise the distance of a detector relative to an acceleration zone, the relative positions of a field-free cylinder and an adjacent reflecting zone electrode, the relative positions of two adjacent reflecting zone electrodes, the relative positions of a reflecting base and an adjacent reflecting zone electrode, the voltage applied to the field-free zone and the voltage applied to a reflecting zone;
Calculating an effective flight path length of the ion based on the initial parameters, the structure and voltage parameters of the acceleration region, and the mass-to-charge ratio of the ion; loading the initial parameters on a flight time mass spectrum device to obtain initial resolution of an ion after flight;
calculating the effective flight path length of the same ion under the target resolution based on the initial resolution and the proportional relation between the effective flight path lengths under the initial resolution;
taking the effective flight path length under the target resolution as a reference, and carrying out parameter adjustment on the flight time mass spectrum device; after obtaining an effective flight path length equivalent to the effective flight path length at the target resolution, final parameters at the target resolution are determined, including the distance of the detector relative to the acceleration zone, the relative position of the field-free cylinder and the adjacent reflective-zone electrode, the relative position of the reflective-zone adjacent two electrodes, the relative position of the reflective pedestal and the adjacent reflective-zone electrode, the voltage applied to the field-free region, the voltage applied to the reflective zone.
In some embodiments, when the electrode is a cylindrical structure, the reflective region is comprised of a plurality of spaced nested cylinders; the inner surface of each cylinder is provided with a resistance layer, and a reflection area is formed in each cylinder with the resistance layer; the field-free region is formed in a cylinder sleeved outside the cylinder at the outermost side of the reflecting region; the reflection base is arranged in the cylinder at the innermost side of the reflection area; the top ends of the inner cylinders of all the cylinders are in contact connection with the inner wall of the outer cylinder through conducting strips, and the top ends of the reflecting bases are in contact connection with the inner wall of the cylinder at the innermost side of the reflecting area through conducting strips; the time-of-flight mass spectrometry device has a longitudinal displacement adjustment mechanism that adjusts the distance traveled by the reflection zone cylinder and the reflection pedestal to change the relative positions of the field-free cylinder and the reflection zone cylinder, between the reflection zone cylinder, and between the reflection zone cylinder and the reflection pedestal.
In some embodiments, at least two cylinders are provided with a resistive layer on the inner surface.
In some embodiments, when the electrode is in a stacked structure, the reflection area is formed by a large pole piece group and a small pole piece group, the large pole piece group comprises a plurality of large pole pieces stacked longitudinally at equal intervals, the small pole piece group comprises a plurality of small pole pieces stacked longitudinally at equal intervals, and adjacent pole pieces in each pole piece group are connected through a resistor; the center of each pole piece is provided with an opening, and the small pole piece group is sleeved in the large pole piece group; the field-free region is formed in the cylinder, the cylinder is sleeved outside the large pole piece group, the uppermost pole piece of the large pole piece group is in contact connection with the inner wall of the cylinder through a conducting plate, the uppermost pole piece of the small pole piece group is in contact connection with one pole piece in the large pole piece group through a conducting plate, and the top end of the reflecting base is in contact connection with one pole piece in the small pole piece group through a conducting plate; the flight time mass spectrum device is provided with a longitudinal displacement adjusting mechanism for adjusting the moving distance of the large pole piece group, the small pole piece group and the reflecting base so as to change the relative positions of the field-free cylinder and the large pole piece group, the large pole piece group and the small pole piece group and the reflecting base.
In some embodiments, the large pole piece set comprises at least three large pole pieces and the small pole piece set comprises at least three small pole pieces. In some embodiments, the relative distance of the detector from the acceleration zone is achieved by a lateral displacement adjustment mechanism.
In some embodiments, the calculating the effective flight path length of the ion based on the initial parameters, the structure and voltage parameters of the acceleration region, and the mass-to-charge ratio of the ion comprises:
calculating the flight time of the acceleration region based on the structure and voltage parameters of the acceleration region and the mass-to-charge ratio of ions, and calculating the flight time of the field-free region and the flight time of the reflection region based on the initial parameters and the mass-to-charge ratio of ions;
summing the flight time of the acceleration region, the flight time of the field-free region and the flight time of the reflection region, and calculating to obtain the total flight time of the ion flight;
multiplying the total flight time by the vertical velocity of the ion in the field-free region to calculate the effective flight path length of the ion; the vertical direction speed in the field-free region is determined based on the mass-to-charge ratio of ions, the field-free region ground voltage, and the acceleration region ground voltage.
In some embodiments, the parameter adjustment of the time-of-flight mass spectrometry apparatus targeting the target resolution includes:
Dividing the equivalent effective flight path length by the vertical speed in the field-free region under the condition that the field-free region voltage to ground is kept unchanged, and calculating to obtain the equivalent total flight time;
the relative positions of the cylinder in the field-free region and the electrode in the adjacent reflecting region are adjusted mainly, the relative positions of the two adjacent electrodes in the reflecting region and the electrode and the reflecting base are adjusted as assistance, under the condition that the voltages applied to the field-free region and the reflecting region are unchanged when the primary parameter setting is kept, the relative positions of the cylinder in the field-free region and the electrode in the adjacent reflecting region, the two adjacent electrodes and the electrode and the reflecting base are reset, and the adjusted total flight time is calculated; multiple times of adjustment to enable the adjusted total flight time to be close to the equivalent total flight time;
after determining the relative positions of the cylinder and the electrode in the adjacent reflection area and the relative positions of the two adjacent electrodes and the electrode and the reflection base in the field-free area, adjusting the voltage applied to the electrode in the reflection area;
calculating to obtain the equivalent distance of the detector relative to the acceleration region based on the horizontal kinetic energy of the ions and the adjusted total flight time; and adjusting the distance of the detector relative to the acceleration zone based on the equivalent distance.
In some embodiments, after obtaining an effective flight path length equivalent to the effective flight path length at the target resolution, the method further comprises, after determining the final parameter at the target resolution: a time greater than the equivalent total flight time is determined as a pulse repulsion period and a pulse repulsion frequency is determined based on the pulse repulsion period.
In some embodiments, the method simulates the time mass spectrometry apparatus function with a simulation platform and is done in conjunction with a computing platform calculation, or the method is done by running a time-of-flight mass spectrometry apparatus and is done in conjunction with a computing platform calculation.
In a second aspect, embodiments of the present disclosure provide a time-of-flight mass spectrometry apparatus comprising a plurality of resolution modes; in each resolution mode, the time-of-flight mass spectrometry apparatus performs parameter configuration according to the parameters at the target resolution determined by the method in one or more embodiments described above.
The technical scheme provided by some embodiments of the present specification has the following beneficial effects:
in one or more embodiments of the present disclosure, parameters of a flight structure model meeting various resolution requirements can be designed based on a time-of-flight mass spectrometry device with adjustable positions of an electrode and a reflective base in an internal reflection region and adjustable relative distance between a detector and an acceleration region, and the parameters are designed with small calculation amount and high calculation efficiency.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present description, the drawings that are required in the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present description, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for designing parameters of a time-of-flight mass spectrometry apparatus according to an embodiment of the present disclosure;
FIG. 2a is a schematic diagram of a time-of-flight mass spectrometry apparatus according to an example of application of the method of FIG. 1, wherein the arrows are flight paths and shorter flight paths;
FIG. 2b is a schematic diagram of a time-of-flight mass spectrometry apparatus according to an example of application of the method of FIG. 1, wherein the arrows are the flight paths and are longer flight paths;
FIG. 3a is a schematic diagram of a time-of-flight mass spectrometry apparatus according to another example of application of the method of FIG. 1, wherein the arrows are the flight paths and the shorter flight paths;
fig. 3b is a schematic structural diagram of a time-of-flight mass spectrometry apparatus under another example to which the method shown in fig. 1 is applied, in which an arrow is a flight path and is a longer flight path.
Detailed Description
The technical solutions in the embodiments of the present specification will be clearly and completely described below with reference to the drawings in the embodiments of the present specification.
The terms first, second, third and the like in the description and in the claims and in the above drawings are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.
The existing time-of-flight mass spectrometry device usually only has one fixed TOF structure model, and only one ion flight path can be realized, so that a plurality of devices with different sizes can be needed for coping in corresponding occasions. For example, in some cases, where too high a resolution is not required, the ion path needs to be shortened, resulting in a shorter total ion flight time, while increasing the frequency of pulse repulsion to maximize ion utilization and resulting in a higher detection limit for the device. In another case, if a certain resolution is required, the ion path is increased, the flight time is lengthened, the repulsion frequency is reduced, and a certain high resolution is ensured although a certain ion utilization efficiency is lost.
In view of this, in the prior art, parameter design is performed in such a way that a device is configured with a resolution, and when parameter design is performed, a distance parameter is determined for a specific structure within the device, and at the same time, a voltage parameter needs to be determined. On the one hand, each device needs to perform a large amount of operations based on multidimensional variables in parameter design; on the other hand, in order to pursue the multiple resolution demands, it is required to perform the aforementioned multi-dimensional variable calculation flow for multiple devices, and obviously, the time and financial costs are consumed in the process, and the design efficiency is low.
Based on this, the embodiment of the present disclosure proposes a parameter design method of a time-of-flight mass spectrometry device, which is applied to a time-of-flight mass spectrometry device capable of configuring multiple resolutions.
Referring to fig. 1, fig. 1 is a flowchart illustrating a method for designing parameters of a time-of-flight mass spectrometry device according to an embodiment of the present disclosure.
As shown in fig. 1, the parameter design method of the time-of-flight mass spectrometry device includes:
102, setting initial parameters for a time-of-flight mass spectrometry device, wherein the initial parameters comprise the distance of a detector relative to an acceleration zone, the relative positions of a field-free cylinder and an adjacent reflecting zone electrode, the relative positions of two adjacent reflecting zone electrodes, the relative positions of a reflecting base on the adjacent reflecting zone electrode, the voltage applied to the field-free zone and the voltage applied to a reflecting zone;
Step 104, calculating the effective flight path length of the ion based on the initial parameters, the structure and voltage parameters of the acceleration region and the mass-to-charge ratio of the ion; loading the initial parameters on a flight time mass spectrum device to obtain initial resolution of an ion after flight;
step 106, calculating the effective flight path length of the same ion under the target resolution based on the initial resolution and the proportional relation between the effective flight path lengths under the initial resolution;
step 108, carrying out parameter adjustment on the flight time mass spectrum device by taking the effective flight path length under the target resolution as a reference; after obtaining an effective flight path length equivalent to the effective flight path length at the target resolution, final parameters at the target resolution are determined, including the distance of the detector relative to the acceleration zone, the relative position of the field-free cylinder and the adjacent reflective-zone electrode, the relative position of the reflective-zone adjacent two electrodes, the relative position of the reflective pedestal and the adjacent reflective-zone electrode, the voltage applied to the field-free region, the voltage applied to the reflective zone.
Generally, a time-of-flight mass spectrometry apparatus includes an ion source, a vacuum interface, a multipole rod mass spectrometry module, an ion guide module, a TOF mass spectrometry module. The ion source generates an ion beam. The ion beam is cooled by multipole rod mass spectrometry modules, such as quadrupole collision focusing (the ion beam reaches a lower energy state of 0-1 ev). The ion guide module is used for improving the focusing effect of ions so as to improve the sensitivity and reducing the speed dispersion and the space dispersion of the ions in the repulsive area to improve the resolution ratio. The TOF mass analysis module comprises a repulsion area, an acceleration area, a field-free area, a reflection area, a detector and a power supply. The power supply applies voltages to the respective zones.
After entering the TOF mass analysis module, ions are injected into the field-free region from the middle of the first pole piece and the second pole piece of the acceleration region, pass through the reflection region, and are reflected to reach the detector. If the accelerating area is not applied with voltage in the vertical direction, the ions keep uniform-speed linear motion, and the stage is an ion accumulation stage; when ions fill the area between the first pole piece and the second pole piece, the accelerating area is applied with voltage in the vertical direction, and the ions start to accelerate in the vertical direction. The ions travel a path before striking the detector. The detector may be a microchannel plate detector, an electron multiplier, a Daly (Daly) detector, or the like.
The method is applied to a time-of-flight mass spectrometry device with adjustable positions of an electrode and a reflecting base in a reflecting area and adjustable relative distance between a detector and an accelerating area. That is, the method is aimed at a TOF structure model with non-fixed (mainly distance parameter is not fixed), and parameters under multiple resolutions can be designed based on one device according to the scene resolution requirement.
In step 102, initial parameter settings are performed. The initial parameters may be initially set according to past experience. The relative distance between the detector and the acceleration region, mainly the distance from the center of the acceleration region to the center of the detector, can be set according to the initial distance value of half of the total width of the acceleration region and the detector. The relative positions of the field-free cylinder and the adjacent reflecting area electrode, the relative positions of the reflecting area adjacent two electrodes and the relative positions of the reflecting base and the adjacent reflecting area electrode can be valued in an adjustable range. For example, the preliminary selection value may be performed to determine the initial parameters based on previous requirements for high resolution or low resolution. Likewise, the voltage parameter is determined initially based on experience.
In an example, when the physical time-of-flight mass spectrometry device is adopted, parameter adjustment is performed on the device according to an initial parameter, for example, a transverse displacement adjustment mechanism is used for adjusting the position of the detector so that the distance between the detector and the acceleration region reaches a position corresponding to the initial parameter, for example, a longitudinal displacement adjustment mechanism is used for adjusting the positions of the electrode and the reflection base so that the relative position relation meets the position corresponding to the initial parameter, for example, a power supply is controlled to control the voltage value applied to the reflection region and the field-free region. At the same time, initial parameters are entered at the computing platform interface for calculation at step 104.
In another example, when the function of the time-of-flight mass spectrometry device is simulated using the simulation platform, initial parameters are input at the interface of the simulation platform, i.e., initial parameter settings are achieved. The simulation platform is pre-configured with virtual architecture and functions corresponding to the real-object flight time mass spectrum device before the method is executed. At the same time, initial parameters are entered at the computing platform interface for calculation at step 104.
In step 104, the effective flight path length of the ions is the flight path length of the ions to the detector through the acceleration zone, the field free zone, the reflection zone in that order.
Specifically, the calculating the effective flight path length of the ion based on the initial parameters, the structure and voltage parameters of the acceleration region, and the mass-to-charge ratio of the ion includes:
step 1042, calculating the flight time of the acceleration region based on the structure and voltage parameters of the acceleration region and the mass-to-charge ratio of the ions, and calculating the flight time of the field-free region and the reflection region based on the initial parameters and the mass-to-charge ratio of the ions;
because the method of the embodiment of the specification carries out parameter design aiming at the same time-of-flight mass spectrum device, the structure and voltage parameters of the acceleration region are unchanged. After the first calculation, the time of flight of the acceleration region is determined to be a known constant. The flight time of the acceleration region is calculated based on the structure and the voltage parameter of the acceleration region by using the existing calculation mode, and the description is omitted.
The flight time of the reflection areas is independently calculated according to the number of the reflection areas, and a follow-up device is taken as an example to be described in detail. And the total flight time of each reflection area is obtained after the flight time of each reflection area is overlapped.
Step 1044, summing the flight time of the acceleration region, the flight time of the field-free region and the total flight time of the reflection region, and calculating to obtain the total flight time of the ion flight;
Step 1046, calculating an effective flight path length of the ion by multiplying the total flight time by a vertical velocity of the ion in the field-free region; the vertical direction speed in the field-free region is determined based on the mass-to-charge ratio of ions, the field-free region ground voltage, and the accelerating region ground voltage.
In particular, the method comprises the steps of,wherein->Is a field-free voltage to ground, +.>To accelerate the region the first pole piece is at ground voltage, and since ions typically fly in the first and second pole pieces, the second pole piece is typically at a voltage level close to zero potential, and thus the vertical velocity of the simplified ions in the field-free region is as described above. After determining the vertical velocity in the field-free region, use is made of +.>Calculating effective flight path length of the ion>. Wherein (1)>Is the total flight time of the ion flight.
The above process is obtained by calculation using a computer platform. The computer platform is pre-configured with a corresponding algorithm, and performs operation after obtaining relevant parameter data. When using the physical device, the parameters measured by the device are input into the computer platform after the measurement result is obtained. This process may send the measurement results to the computer platform by manual input or by establishing a signal link between the device and the computer platform. When the simulation platform is utilized, the test result obtained after the simulation platform is subjected to the simulation test can be sent to the computer platform.
In step 104, initial parameters are loaded into the time-of-flight mass spectrometry apparatus to obtain an initial resolution of an ion after flight. The parameter loading operation can be performed by using a physical device or a virtual device on the simulation platform.
In step 106, the effective flight length of the ion is generally proportional to the resolution, and therefore, the effective flight length of the ion at the target resolution can be determined based on the proportional relationship.
For example, the initial resolution obtained under the initial parameters isTarget resolution of +.>Effective flight path length of the same ion at target resolution +.>。
In step 108, a parameter adjustment is performed on the time-of-flight mass spectrometry device targeting the target resolution. In the mode, a large amount of calculation is not needed, parameter adjustment is performed in the scope under the target standard, and accurate design parameters can be quickly obtained by matching with proper amount of calculation.
Specifically, the above-mentioned process includes:
step 1082, dividing the equivalent effective flight path length by the vertical velocity in the field-free region, and calculating an equivalent total flight time while maintaining the field-free region to ground voltage unchanged;
the field-free voltage to ground remains unchanged, which means that the field-free voltage to ground is not changed after the preliminary parameter setting. After the equivalent effective flight path length at the target resolution is obtained using step 106, an equivalent total flight time is obtained by calculation.
Step 1084, mainly adjusting the relative positions of the cylinder without field area and the electrode in the adjacent reflection area, adjusting the relative positions of the two adjacent electrodes in the reflection area and the relative positions of the reflection base and the electrode in the adjacent reflection area, resetting the relative positions of the cylinder without field area and the electrode in the adjacent reflection area, the relative positions of the two adjacent electrodes and the relative positions of the electrode and the reflection base under the condition that the voltage applied to the cylinder without field area and the reflection area is unchanged when the primary parameter setting is kept, and calculating to obtain the adjusted total flight time; and adjusting a plurality of times so that the adjusted total flight time is close to the equivalent total flight time.
The distance parameter is firstly adjusted, and the position of the reflecting area electrode and the reflecting base is mainly adjusted. For ions of the same m/z, the longer the flight time, the higher the resolution generally obtained by the device, and in general, increasing the flight distance is an important means of improving the resolution, mainly in the field-free length. For this reason, the relative positions of the field-free cylinder and the electrodes in the adjacent reflection regions need to be adjusted with emphasis, and when parameters at higher resolutions are required to be obtained, the relative positions of the field-free cylinder and the electrodes in the adjacent reflection regions are elongated on the basis of the primary parameters, and when parameters at lower resolutions are required to be obtained, the relative positions of the field-free cylinder and the electrodes in the adjacent reflection regions are shortened on the basis of the primary parameters. Based on the principle, the distance parameter is re-selected, and the adjusted total flight time is re-calculated by using the formula. The equivalent total flight time is taken as a target, so that the calculation result after parameter adjustment is as close as possible to the equivalent total flight time image (comprising the condition that the calculation result and the equivalent total flight time image are equal to each other).
This process defaults to not adjusting the voltage applied to the electrodes, yet still adopts the voltage value at the initial parameter setting. Judging the difference value between the adjusted total flight time and the equivalent total flight time, and if the difference value is not greater than a first threshold value, the first threshold value can be 1Or other value, then it is determined that the adjusted total time of flight is close to the equivalent total time of flight. After that, after determining the distance parameter of the reflection area, step 1086 is performed to adjust the voltage parameter.
Step 1086, after determining the relative positions of the cylinder and the electrode in the adjacent reflective region, the two adjacent electrodes, and the electrode and the reflective base in the field-free region, adjusting the voltage applied to the electrode in the reflective region;
the process can be performed by using the existing voltage parameter adjustment method, for example, a second order focusing algorithm is used for calculating a voltage value with optimal resolution, and then fine adjustment is performed by taking the calculated value as a reference; alternatively, the voltage value adjustment is performed directly empirically.
Step 1088, calculating to obtain an equivalent distance of the detector relative to the acceleration region based on the horizontal kinetic energy of the ion and the adjusted total flight time; and adjusting the distance of the detector relative to the acceleration zone based on the equivalent distance.
The initial state of the ion beam, including the transverse kinetic energy v of the ions, is substantially determined prior to entering the TOF mass analysis module ∥ Longitudinal position dispersion and energy dispersion. The transverse kinetic energy of the ions can be related to the relative distance x between the detector and the acceleration region under different flight paths 0 . Specifically, the formula x can be passed 0=T* v ∥ Calculating to obtain x 0 . The calculated value is the reference value, and then the distance parameter is finely tuned on the real object or on the virtual device on the simulation platform. During adjustment it is necessary to ensure that ions can strike out of the detector.
The related calculation involved in the process can be completed through a computing platform, and the related parameter adjustment and loading test can be realized through a physical device or a virtual device on a simulation platform.
In step 108, after obtaining an effective flight path length equivalent to the effective flight path length at the target resolution, determining final parameters at the target resolution includes:
after the adjustment to obtain a specific parameter, the parameter may be taken as the final parameter.
For example, when the final parameters are determined during the adjustment on the physical device, the relevant detection of the sample is performed. For another example, after simulation determination on the simulation platform, the simulation platform may be configured on the physical device according to the final parameters. The device configured with the parameters then performs a correlation test of the sample.
The method of the embodiment of the present specification, after obtaining the effective flight path length equivalent to the effective flight path length at the target resolution, determines the final parameter at the target resolution, the method further includes:
a time greater than the equivalent total flight time is determined as a pulse repulsion period and a pulse repulsion frequency is determined based on the pulse repulsion period.
After the ions are incident, if no voltage in the vertical direction exists, uniform linear motion is kept, and the ions always move from left to right, and the stage is called an ion accumulation stage; when the ions fill the area between the first pole piece and the second pole piece of the accelerating area, the accelerating area applies a voltage in the vertical direction, so that the ions start to accelerate in the vertical direction. The two processes are then cyclically accumulated and accelerated, the frequency of which is the pulse repulsion frequency of the applied voltage.
The pulse repulsion frequency determines the maximum flight time of a single ion flight, since each application of a vertical voltageThe time of flight of the ion in the cycle starts from the start timing point until the maximum ion, i.e. the ion with the maximum flight time, is detected by the detector. If the period is too short, the ions in the previous period do not fly to the detector yet, and are caught up by the ions in the next period, so that the spectrogram is overlapped with the ions in different periods, and analysis is difficult. The frequency of repulsion is therefore not preferred to be too fast. But at the same time, the frequency determines the utilization efficiency of the ions, the ions continuously move linearly at a constant speed from the front end through the accumulation area, and if the frequency is too low, the ions are only utilized when a few pulse voltages are applied, so that the frequency is not too low.
Since the ions m/z are different, the time of their movement is different, and therefore the maximum total time of flight should be determined by the maximum m/z ions that may be present in the measurement. For this purpose, the pulse repulsion period is calculated based on the maximum flight time of a single ion flight, followed by calculation of the pulse repulsion frequency. The time longer than the equivalent total flight time is determined as the pulse repulsion period, so that the problem that spectrogram superposition is difficult to resolve can be avoided.
In the above process, if the simulation platform and the computing platform are completed together, the simulation platform and the computing platform can operate at the same terminal device to efficiently realize parameter design.
Next, in order to facilitate understanding of the entire design flow, a specific configuration of the time-of-flight mass spectrometer will be described in detail.
Fig. 2a and 2b show schematic structural diagrams of a mass spectrometry device in an example. The device comprises an acceleration zone 1, a field-free zone 2, reflection zones 7, 8, a detector 3. The electrode in the reflecting area adopts a cylindrical structure. The reflective area of the device is formed by a plurality of spaced nested cylinders and a reflective base. The inner surface of each cylinder is provided with a resistance layer, and a reflection area is formed in each cylinder with the resistance layer, namely, one cylinder with the resistance layer forms a reflection area, and when a plurality of cylinders with the resistance layer exist, a plurality of reflection areas are formed by taking the cylinders as units. The field-free region is formed in a cylinder sleeved outside the cylinder at the outermost side of the reflecting region. The reflection base is arranged in the cylinder at the innermost side of the reflection area. The view is from outside to inside sequentially with a field-free region, a reflecting region and a reflecting base. The top ends of the inner cylinders of all the cylinders are in contact connection with the inner wall of the outer cylinder through the conductive sheet, and the top ends of the reflection bases are in contact connection with the inner wall of the cylinder at the innermost side of the reflection area through the conductive sheet. Preferably, the conductive sheet is a metal spring sheet. The time-of-flight mass spectrometry device has a longitudinal displacement adjustment mechanism that adjusts the distance traveled by the reflection zone cylinder and the reflection pedestal to change the relative positions of the field-free cylinder and the reflection zone cylinder, between the reflection zone cylinder, and between the reflection zone cylinder and the reflection pedestal.
At least two cylinders with the inner surfaces provided with the resistor layers are arranged. When there are two cylinders, two reflective regions are formed (see fig. 2a, 2 b). When there are a plurality of cylinders, a plurality of reflection regions may be formed in the above-described manner. The same N+1 longitudinal displacement adjusting mechanisms are configured according to the number N of the reflecting area cylinders and one reflecting base. The N+1 longitudinal displacement adjusting mechanisms can be realized by using a guide rod and a motor, one end of the guide rod is connected with an output shaft of the motor, and the other end of the guide rod is connected with a cylinder or a base of the reflecting base. The motors 16, 17 and 18 respectively drive the guide rods 13, 14 and 15 to act, then drive the reflecting base 9 or the cylinder to longitudinally move, and then realize displacement change between the field-free cylinder and the reflecting area cylinder, between the reflecting area cylinder and the reflecting base.
Specifically, in fig. 2a, there are 3 cylinders and 1 reflection base 9, the outermost cylinder forms no field region 2 therein, and the other cylinders form first and second reflection regions 7 and 8 therein. The position of the outermost cylinder is fixed, and other cylinders are controlled by a longitudinal displacement adjusting mechanism to control the cylinders to move longitudinally. The motor can adopt a stepping motor, and the step number of the motor can be determined based on the moving distance or the moving distance can be determined based on the step number of the motor through the conversion relation of the step number and the distance. At the same time, the detector is provided with a lateral displacement adjustment mechanism for controlling the distance of the detector relative to the acceleration zone. The transverse displacement adjusting mechanism can adopt the same device as the longitudinal displacement adjusting mechanism and comprises a guide rod 5 and a motor 6, one end of the guide rod is connected with the motor, and the other end of the guide rod is connected with the base of the detector 3. The motors are all arranged outside the vacuum cavity 19, the guide rod extends into the cavity 19 from outside the cavity, and the guide rod is sealed at the juncture of the cavity.
Before proceeding with the method operation description, the following distance parameters are defined: the lateral distance from the center of the acceleration zone 1 to the center of the detector 3 isThe distance between the top of the cylinder in the field-free region and the metal shrapnel at the top of the cylinder in the first-order reflection region is +.>The distance between the metal spring sheet at the top end of the cylinder of the primary reflecting area and the metal spring sheet at the top end of the cylinder of the secondary reflecting area is +.>The distance between the top metal spring sheet of the cylinder of the secondary reflection area and the top metal spring sheet of the reflection base is +.>. The voltage at the upper end and the lower end of the cylinder of the first-stage reflection area isWherein->For the voltage to ground at the upper end of the first reflection area cylinder, +.>The voltage of the upper end and the lower end of the second reflecting area cylinder is +.>Wherein->Is the voltage to ground at the upper end of the second reflection area cylinder, +.>Is the voltage to ground at the upper end of the reflection base.
When an ion beam enters the TOF mass analysis module from the front end, various parameters including horizontal kinetic energy, ion beam width, ion vertical divergence angle and the like are relatively fixed. It is assumed that the number of the sub-blocks,，/>for accelerating the first pole piece of the area to ground voltage, < >>. Considering that different flight path parameter designs are carried out in the same flight time mass spectrum device, the structure and voltage parameters of the acceleration area are unchanged, so that the flight time of ions in the acceleration area is a fixed value, and supposing +. >。
Initial parameter setting is performed first.The value range is 0-300 mm; />The value is 0-1000 mm; />The value is 0-100 mm; />The value is 0-100 mm. Then the value is selected within this range, e.g. +.>=2000mm，/>=10mm，/>=40 mm. Suppose no field voltage +.>. Then, based on the structural parameters, the voltage value of the reflection area is determined in the adjustable range thereof, < >>，/>。
Taking an ion with m/z=100 as an example, the time of flight T is calculated according to the following formula:
in some practical measurement requirement, the target resolution of our requirement isEquivalent effective flight path length +.>。
Here we keepUnchanged, thus->Also unchanged, calculate the equivalent total time of flight +.>。
Generally, most of the time ions fly in TOF is determined byContributing, i.e. the time of flight of the ions in the field-free region, which can also be seen from the calculation of the time of flight from the previous initial state.
Therefore, we want to lengthen the total flight time, mainly by elongating the length of the field free region, and since the reflected voltage is generally adjusted, the time of the ions in the reflection region contributes less to the total flight time, and here, for the convenience of estimation, the reflected voltage is also fixed.
When we getAt this time, the adjusted total flight time can be calculated: />。
This value isNear the value required before +.>The difference between them is 0.01%>. The structural parameters can be fixed to these values and then the real or virtual machine performs voltage trimming.
Finally, the position of the detector is determined byCan calculate +.>，/>When a real machine or a virtual machine is tested, the real machine or the virtual machine is trimmed around the value.
After the TOF structure and voltage parameters are determined, a suitable pulse frequency is also required to be set, and the repulsion pulse period is set to be slightly longer than the flight time of the maximum ions, so that the flight time mass spectrometry device can be put into use.
Based on the above flow, parameter designs with different resolution requirements can be realized on the same device.
Fig. 3a and 3b show schematic structural diagrams of a mass spectrometry device in another example.
The device comprises an acceleration zone 1, a field-free zone 2, reflection zones 7, 8, a detector 3. The electrodes in the reflecting area adopt a stacked structure. The field-free region 2 of the device is formed within a cylinder. The reflection area is composed of a large pole piece group 7, a small pole piece group 8 and a reflection base 9. The large pole piece group comprises a plurality of large pole pieces which are longitudinally stacked at equal intervals, the small pole piece group comprises a plurality of small pole pieces which are longitudinally stacked at equal intervals, and adjacent pole pieces in each pole piece group are connected through a resistor. And the small pole piece group is sleeved in the large pole piece group. The cylinder is sleeved outside the large pole piece group, the uppermost pole piece of the large pole piece group is in contact connection with the inner wall of the cylinder through the conductive piece, the uppermost pole piece of the small pole piece group is in contact connection with a certain pole piece in the large pole piece group through the conductive piece, and the top end of the reflection base is in contact connection with a certain pole piece in the small pole piece group through the conductive piece. Preferably, the conductive sheet is a metal spring sheet. The flight time mass spectrum device is provided with a longitudinal displacement adjusting mechanism for adjusting the moving distance of the large pole piece group, the small pole piece group and the reflecting base so as to change the relative positions of the field-free cylinder and the large pole piece group, the large pole piece group and the small pole piece group and the reflecting base. And the same N+1 longitudinal displacement adjusting mechanisms are configured according to the number N of the pole piece groups and the 1 reflection bases. The N+1 longitudinal displacement adjusting mechanisms can be realized by using a guide rod and a motor, one end of the guide rod is connected with an output shaft of the motor, and the other end of the guide rod is connected with a cylinder or a base of the reflecting base. The motors 16, 17 and 18 respectively drive the guide rods 13, 14 and 15 to act, then drive the reflecting base 9 and the pole piece group to longitudinally move, and then realize displacement change between the field-free cylinder and the pole piece group, the two adjacent pole piece groups and the pole piece group and the reflecting base.
The detector is provided with a lateral displacement adjustment mechanism for controlling the distance of the detector relative to the acceleration zone. The transverse displacement adjusting mechanism can be realized by adopting a guide rod and a motor, one end of the guide rod 5 is connected with the motor 6, and the other end is connected with the base of the detector 3. The motor drives the guide rod to act, so that the detector is driven to transversely move, and the relative distance between the detector and the acceleration zone is changed.
Assuming that the large pole piece group is stacked with X large pole pieces, the small pole piece group is stacked with Y small pole pieces, each pole piece adopts a pole piece with the thickness D, and the distance between the adjacent pole pieces is D. After stacking, the large pole piece group forms a stacked structure with the length of (X-1) D+X D, and voltage is loaded on the head pole piece and the tail pole piece of the large pole piece groupThe overall average electric field strength can be calculated +.>After stacking, the small pole piece group forms a stacked structure with length of (Y-1) D+Y D, and voltage is loaded on the head pole piece and the tail pole piece of the small pole piece groupThe overall average electric field strength can be calculated +.>/(X-1) D+X D). The values of X and Y can be set according to the actual reflector length requirements.
The reflective region illustrated in the examples of fig. 3a, 3b comprises at least two pole piece groups, and may further comprise further pole piece groups, arranged in sequence in a nested fashion. Two pole piece groups are generally selected under application. When two pole piece groups are adopted, the large pole piece group at least comprises three large pole pieces, the small pole piece group at least comprises three small pole pieces, and the number of pole pieces in the large pole piece group and the number of pole pieces in the small pole piece group can be equal or unequal.
When the large pole piece group moves a certain distance, the distance from the metal spring piece of the uppermost pole piece of the large pole piece group to the top end of the cylinder is as followsThe voltage applied to the cylinder is field-free voltage +.>. When the small pole piece group moves for a certain distance, the distance from the metal spring piece of the uppermost pole piece of the small pole piece group to the metal spring piece of the uppermost pole piece of the large pole piece group is +.>The voltage applied to the large pole piece group is the first reflection area voltage +.>. First reflection region voltage->Wherein->The upper end of the large pole piece group is grounded, and the voltage is +.>The upper end of the small pole piece group is grounded. When the reflection base moves a certain distance, the distance from the metal spring sheet of the reflection base to the metal spring sheet of the uppermost pole piece of the small pole piece group is +.>The voltage applied to the small pole piece group is the second reflection area voltage +>. Second reflection region voltage->. Wherein (1)>The upper end of the small pole piece group is grounded, and the voltage is +.>Is to reflect the voltage to ground at the upper end of the base. Referring to the computational flow in the example shown in FIG. 2a, design parameters may be determined.
The difference between the examples shown in fig. 3a and 3b and the examples shown in fig. 2a and 2b is that when the stacking structure is adopted and the relative positions of the pole pieces need to be adjusted, the layer-by-layer position adjustment is performed at a fixed interval distance; when the sleeve structure is adopted, the relative position of the pole pieces needs to be changed by moving the sleeve position. While the examples of fig. 2a, 2b enable continuous range distance adjustment, the examples of fig. 3a, 3b enable only discrete distance variations.
After the design parameters are obtained according to the design method in one or more embodiments described above, the time-of-flight mass spectrometry device can be configured according to different parameters to meet different resolution scene requirements. And then detected by the time-of-flight mass spectrometry device. For example, the results of different ion flight paths in the same device are used to obtain the relatively accurate flight time of the ions, and further obtain the relatively accurate mass number.
Based on the condition that the incident ions are unchanged, adjusting the structure and voltage parameters to enable the ion beam of the same sample to fly in different flight paths twice, wherein the two flight paths correspond to mass spectrograms of the two flight times on response intensity;
respectively calibrating mass axes of the two spectrograms by using known standard substances to obtain mass spectrograms of m/z about response intensity, such as based on the two known substancesAnd->Calibration was performed assuming that the charge numbers were all 1, and their flight times were determined to be +.>And->The following relationship can then be obtained: />；
A spectrogram under another flight path, the obtained conversion relation is；
Thus, two spectrograms of the quality number relative to the response intensity are obtained, the peak of the final required accurate quality number is found first, and the time of the peak in the two spectrograms is read And-> ；
Then, the difference value of the flight time of the substances is calibrated by using the two spectrograms, and a relational expression between the flight time difference value and the mass number is obtained:finally, will->And->Substituting to obtain final relative accurate mass number +.>。
The above-described embodiments are merely preferred embodiments of the present disclosure, and do not limit the scope of the disclosure, and various modifications and improvements made by those skilled in the art to the technical solutions of the disclosure should fall within the protection scope defined by the claims of the disclosure without departing from the design spirit of the disclosure.

Claims (10)

1. The parameter design method of the time-of-flight mass spectrometry device is characterized by being applied to the time-of-flight mass spectrometry device with adjustable positions of an electrode and a reflection base in a reflection area and adjustable relative distance between a detector and an acceleration area; the method comprises the following steps:
setting initial parameters for the time-of-flight mass spectrometry device, wherein the initial parameters comprise the distance of a detector relative to an acceleration zone, the relative positions of a field-free cylinder and an adjacent reflecting zone electrode, the relative positions of two adjacent reflecting zone electrodes, the relative positions of a reflecting base and an adjacent reflecting zone electrode, the voltage applied to the field-free zone and the voltage applied to a reflecting zone;
Calculating an effective flight path length of the ion based on the initial parameters, the structure and voltage parameters of the acceleration region, and the mass-to-charge ratio of the ion; loading the initial parameters on a flight time mass spectrum device to obtain initial resolution of an ion after flight;
calculating the effective flight path length of the same ion under the target resolution based on the initial resolution and the proportional relation between the effective flight path lengths under the initial resolution;
taking the effective flight path length under the target resolution as a reference, and carrying out parameter adjustment on the flight time mass spectrum device; after obtaining an effective flight path length equivalent to the effective flight path length at the target resolution, final parameters at the target resolution are determined, including the distance of the detector relative to the acceleration zone, the relative position of the field-free cylinder and the adjacent reflective-zone electrode, the relative position of the reflective-zone adjacent two electrodes, the relative position of the reflective pedestal and the adjacent reflective-zone electrode, the voltage applied to the field-free region, the voltage applied to the reflective zone.
2. The method of claim 1 wherein when said electrode is of cylindrical configuration, said reflective region is comprised of a plurality of spaced nested cylinders; the inner surface of each cylinder is provided with a resistance layer, and a reflection area is formed in each cylinder with the resistance layer; the field-free region is formed in a cylinder sleeved outside the cylinder at the outermost side of the reflecting region; the reflection base is arranged in the cylinder at the innermost side of the reflection area; the top ends of the inner cylinders of all the cylinders are in contact connection with the inner wall of the outer cylinder through conducting strips, and the top ends of the reflecting bases are in contact connection with the inner wall of the cylinder at the innermost side of the reflecting area through conducting strips; the time-of-flight mass spectrometry device has a longitudinal displacement adjustment mechanism that adjusts the distance traveled by the reflection zone cylinder and the reflection pedestal to change the relative positions of the field-free cylinder and the reflection zone cylinder, between the reflection zone cylinder, and between the reflection zone cylinder and the reflection pedestal.
3. The method of claim 2, wherein the cylinder having the resistive layer on the inner surface is at least two.
4. The method of claim 1, wherein when the electrode is in a stacked structure, the reflective region is composed of a large pole piece group and a small pole piece group, the large pole piece group comprises a plurality of large pole pieces stacked longitudinally at equal intervals, the small pole piece group comprises a plurality of small pole pieces stacked longitudinally at equal intervals, and adjacent pole pieces in each pole piece group are connected through a resistor; the center of each pole piece is provided with an opening, and the small pole piece group is sleeved in the large pole piece group; the field-free region is formed in the cylinder, the cylinder is sleeved outside the large pole piece group, the uppermost pole piece of the large pole piece group is in contact connection with the inner wall of the cylinder through a conducting plate, the uppermost pole piece of the small pole piece group is in contact connection with one pole piece in the large pole piece group through a conducting plate, and the top end of the reflecting base is in contact connection with one pole piece in the small pole piece group through a conducting plate; the flight time mass spectrum device is provided with a longitudinal displacement adjusting mechanism for adjusting the moving distance of the large pole piece group, the small pole piece group and the reflecting base so as to change the relative positions of the field-free cylinder and the large pole piece group, the large pole piece group and the small pole piece group and the reflecting base.
5. The method of claim 4, wherein the large pole piece set comprises at least three large pole pieces and the small pole piece set comprises at least three small pole pieces.
6. The method of claim 1, wherein the relative distance of the detector from the acceleration zone is achieved by a lateral displacement adjustment mechanism.
7. The method of claim 1, wherein calculating the effective flight path length of the ion based on the initial parameters, the structure and voltage parameters of the acceleration region, and the mass-to-charge ratio of the ion comprises:
calculating the flight time of the acceleration region based on the structure and voltage parameters of the acceleration region and the mass-to-charge ratio of ions, and calculating the flight time of the field-free region and the flight time of the reflection region based on the initial parameters and the mass-to-charge ratio of ions;
summing the flight time of the acceleration region, the flight time of the field-free region and the flight time of the reflection region, and calculating to obtain the total flight time of the ion flight;
multiplying the total flight time by the vertical velocity of the ion in the field-free region to calculate the effective flight path length of the ion; the vertical direction speed in the field-free region is determined based on the mass-to-charge ratio of ions, the field-free region ground voltage, and the acceleration region ground voltage.
8. The method of claim 1, wherein parameter tuning the time-of-flight mass spectrometry apparatus based on the effective flight path length at the target resolution comprises:
dividing the equivalent effective flight path length by the vertical speed in the field-free region under the condition that the field-free region voltage to ground is kept unchanged, and calculating to obtain the equivalent total flight time;
the relative positions of the cylinder in the field-free region and the electrode in the adjacent reflecting region are adjusted mainly, the relative positions of the two adjacent electrodes in the reflecting region and the electrode and the reflecting base are adjusted as assistance, under the condition that the voltages applied to the field-free region and the reflecting region are unchanged when the primary parameter setting is kept, the relative positions of the cylinder in the field-free region and the electrode in the adjacent reflecting region, the two adjacent electrodes and the electrode and the reflecting base are reset, and the adjusted total flight time is calculated; multiple times of adjustment to enable the adjusted total flight time to be close to the equivalent total flight time;
after determining the relative positions of the cylinder and the electrode in the adjacent reflection area and the relative positions of the two adjacent electrodes and the electrode and the reflection base in the field-free area, adjusting the voltage applied to the electrode in the reflection area;
calculating to obtain the equivalent distance of the detector relative to the acceleration region based on the horizontal kinetic energy of the ions and the adjusted total flight time; and adjusting the distance of the detector relative to the acceleration zone based on the equivalent distance.
9. The method of claim 8, wherein after determining the final parameter at the target resolution after obtaining an effective flight path length equivalent to the effective flight path length at the target resolution, the method further comprises: a time greater than the equivalent total flight time is determined as a pulse repulsion period and a pulse repulsion frequency is determined based on the pulse repulsion period.
10. The method of claim 1 or 7 or 8 or 9, wherein the method is performed by simulating the time mass spectrometry device function with a simulation platform and in conjunction with a computing platform calculation, or the method is performed by running a time-of-flight mass spectrometry device and in conjunction with a computing platform calculation.
CN202311064561.3A 2023-08-23 2023-08-23 Parameter design method of flight time mass spectrum device Active CN116822248B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311064561.3A CN116822248B (en) 2023-08-23 2023-08-23 Parameter design method of flight time mass spectrum device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311064561.3A CN116822248B (en) 2023-08-23 2023-08-23 Parameter design method of flight time mass spectrum device

Publications (2)

Publication Number Publication Date
CN116822248A true CN116822248A (en) 2023-09-29
CN116822248B CN116822248B (en) 2023-11-17

Family

ID=88122353

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202311064561.3A Active CN116822248B (en) 2023-08-23 2023-08-23 Parameter design method of flight time mass spectrum device

Country Status (1)

Country Link
CN (1) CN116822248B (en)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050040326A1 (en) * 2003-03-20 2005-02-24 Science & Technology Corporation @ Unm Distance of flight spectrometer for MS and simultaneous scanless MS/MS
CN1685467A (en) * 2002-09-24 2005-10-19 赛弗根生物系统股份有限公司 Electric sector time-of-flight mass spectrometer with adjustable ion optical elements
US20050242279A1 (en) * 2002-07-16 2005-11-03 Leco Corporation Tandem time of flight mass spectrometer and method of use
US20130168547A1 (en) * 2010-09-08 2013-07-04 Shimadzu Corporation Time-Of-Flight Mass Spectrometer
US20150014522A1 (en) * 2011-12-23 2015-01-15 Dh Technologies Development Pte. Ltd. First and second order focusing using field free regions in time-of-flight
CN105702558A (en) * 2016-01-29 2016-06-22 中国科学院地质与地球物理研究所 Method for eliminating ion initial position dispersion of time-of-flight mass spectrometer
CN112461914A (en) * 2020-11-18 2021-03-09 深圳市步锐生物科技有限公司 Method, device, terminal and storage medium for correcting mass spectrum voltage parameters in real time
CN113053721A (en) * 2019-12-27 2021-06-29 兰州空间技术物理研究所 Small-size time of flight mass spectrometer
CN115952611A (en) * 2022-09-28 2023-04-11 上海交通大学 Parameter design method of time-of-flight mass spectrometer

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050242279A1 (en) * 2002-07-16 2005-11-03 Leco Corporation Tandem time of flight mass spectrometer and method of use
CN1685467A (en) * 2002-09-24 2005-10-19 赛弗根生物系统股份有限公司 Electric sector time-of-flight mass spectrometer with adjustable ion optical elements
US20050040326A1 (en) * 2003-03-20 2005-02-24 Science & Technology Corporation @ Unm Distance of flight spectrometer for MS and simultaneous scanless MS/MS
US20130168547A1 (en) * 2010-09-08 2013-07-04 Shimadzu Corporation Time-Of-Flight Mass Spectrometer
US20150014522A1 (en) * 2011-12-23 2015-01-15 Dh Technologies Development Pte. Ltd. First and second order focusing using field free regions in time-of-flight
CN105702558A (en) * 2016-01-29 2016-06-22 中国科学院地质与地球物理研究所 Method for eliminating ion initial position dispersion of time-of-flight mass spectrometer
CN113053721A (en) * 2019-12-27 2021-06-29 兰州空间技术物理研究所 Small-size time of flight mass spectrometer
CN112461914A (en) * 2020-11-18 2021-03-09 深圳市步锐生物科技有限公司 Method, device, terminal and storage medium for correcting mass spectrum voltage parameters in real time
CN115952611A (en) * 2022-09-28 2023-04-11 上海交通大学 Parameter design method of time-of-flight mass spectrometer

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
A.F. DODONOV, ET AL.: "High-Resolution Electrospray Ionization Orthogonal-Injection Time-of-Flight Mass Spectrometer", 《RESEARCHGATE》 *
JIAN SUN, ET AL.: "Miniaturized time-of-flight mass spectrometer for lunar water detection", 《VACUUM》 *
李玉泽 等: "小型飞行时间质谱装置的构建", 《质谱学报》 *

Also Published As

Publication number Publication date
CN116822248B (en) 2023-11-17

Similar Documents

Publication Publication Date Title
US5880466A (en) Gated charged-particle trap
US5160840A (en) Time-of-flight analyzer and method
JP4957798B2 (en) Multiple reflection time-of-flight mass analyzer and time-of-flight mass spectrometer having a mass analyzer
JP3990889B2 (en) Mass spectrometer and measurement system using the same
JP4922900B2 (en) Vertical acceleration time-of-flight mass spectrometer
JP5596031B2 (en) TOF mass spectrometer and related methods for astigmatism imaging
US5969348A (en) Wide mass range focusing in time-of-flight mass spectrometers
JP3430250B2 (en) Method and apparatus for correcting mass error in a time-of-flight mass spectrometer
JP2011119279A (en) Mass spectrometer, and measuring system using the same
US7947950B2 (en) Energy focus for distance of flight mass spectometry with constant momentum acceleration and an ion mirror
JP5482905B2 (en) Time-of-flight mass spectrometer
JP2015185306A (en) Time-of-flight type mass spectroscope
US8492711B2 (en) Multi-turn time-of-flight mass spectrometer
CN103094052A (en) Multiple ion injection in mass spectrometry
JP7115129B2 (en) Time-of-flight mass spectrometer and program
US20070272848A1 (en) Orthogonal time-of-flight mass spectrometers with low mass discrimination
CN116822248B (en) Parameter design method of flight time mass spectrum device
JP4248540B2 (en) Mass spectrometer and measurement system using the same
CN105529240B (en) Utilize the time of-flight mass spectrometer of wide mass range space-focusing
JP7069373B2 (en) Time-of-flight mass spectrometer and mass spectrometry method
CN105702558B (en) It is a kind of to eliminate the scattered method of time of-flight mass spectrometer ion initial position
US7038198B2 (en) Mass spectrometer
JP2942815B2 (en) Particle selection method and time-of-flight type selection type particle analyzer
CN117347464A (en) Sample mass number calculation method and device
CN108490065B (en) Method and device for improving resolution of mass spectrum

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant