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CN-122016575-A - Aerosol particle photoionization system

CN122016575ACN 122016575 ACN122016575 ACN 122016575ACN-122016575-A

Abstract

The invention discloses an aerosol particle photoionization system, and belongs to the technical field of aerosol particle ionization. The invention relates to an aerosol particle photoionization system, which comprises a sample cell, wherein a sample inlet and a sample outlet are respectively arranged on the sample cell, a polarized electrode unit is provided with a load electrode and a collecting electrode, a light-emitting end of a light source unit is arranged between the load electrode and the collecting electrode, a working end of the load electrode extends into the sample cell and is arranged at the position of the light-emitting end of a light source assembly, the collecting electrode is arranged on the sample cell and corresponds to the load electrode, and the pressure ratio of a limiting hole is regulated to keep the flow rate of air flowing through the sample outlet constant.

Inventors

  • YU ZHENHONG
  • Gou qian
  • LIU YUAN
  • CHEN XIUQING

Assignees

  • 杭州微电灵辉科技有限公司

Dates

Publication Date
20260512
Application Date
20260320

Claims (10)

  1. 1. An aerosol particle photoionization system comprising a sample cell (100), the sample cell (100) being provided with a sample inlet (101) and a sample outlet (102) respectively, characterized in that it further comprises: the light source unit is arranged on the sample cell (100), and is provided with a light emitting end which is used for generating a light source and irradiating a position corresponding to the sample inlet (101) in the sample cell (100); The polarized electrode unit is provided with a load pole (500) and an acquisition pole (600), the light-emitting end of the light source unit is arranged between the load pole (500) and the acquisition pole (600), the working end of the load pole (500) extends into the sample cell (100) and is arranged at the position of the light-emitting end of the light source assembly, and the acquisition pole (600) is arranged on the sample cell (100) and corresponds to the load pole (500) and is used for acquiring aerosol particle ions; The flow control unit is provided with a limiting hole (800), the inlet end of the limiting hole (800) is communicated with the sample outlet (102), and the pressure ratio of the limiting hole (800) is adjusted to maintain the constant flow rate of the air flow flowing through the sample outlet (102).
  2. 2. An aerosol particle photoionization system as claimed in claim 1, wherein the light source unit comprises an ultraviolet lamp (200), one end of the ultraviolet lamp (200) being provided with a quartz window (201), the quartz window (201) extending into the sample cell (100) to be adapted to the sample inlet (101), an ultraviolet beam being formed through the quartz window (201) for ionizing aerosol particles into aerosol particle ions.
  3. 3. An aerosol particle photoionization system as claimed in claim 2, wherein the photon energy of the uv lamp (200) is 10.6eV.
  4. 4. The aerosol particle photoionization system of claim 1, wherein the polarized electrode unit comprises a polarized electrode voltage stabilizing circuit board (400), a voltage stabilizing positive electrode output end (401) and a voltage stabilizing negative electrode output end (402) are arranged on the polarized electrode voltage stabilizing circuit board (400), the voltage stabilizing positive electrode output end (401) is electrically connected with the load electrode (500) through a wire, the voltage stabilizing negative electrode output end (402) is electrically connected with the outer wall of the sample cell (100) through a stainless steel wire, and a detection and analysis assembly is arranged on the collecting electrode (600) and used for collecting and analyzing aerosol particle ions in the sample cell (100).
  5. 5. The aerosol particle photoionization system of claim 4, wherein the detection and analysis assembly comprises a current detector (601), the current detector (601) being electrically connected to the collector (600), the current detector (601) being connected to a data analyzer (602) by a wire.
  6. 6. An aerosol particle photoionization system as claimed in claim 5, wherein the data analyzer (602) is a high sensitivity microcurrent amplification instrument or a mass spectrometry instrument.
  7. 7. An aerosol particle photoionization system as claimed in claim 1, wherein the flow control unit comprises a vacuum pump (700), the outlet end of the flow restrictor orifice (800) being in communication with the vacuum pump (700), the inlet end of the flow restrictor orifice (800) being in communication with the sample outlet (102) on the sample cell (100).
  8. 8. The aerosol particle photoionization system of claim 7, wherein the inlet end of the flow restrictor orifice (800) is provided with an air flow conduit (801), and wherein the outlet of the air flow conduit (801) is fixedly connected to the sample outlet (102) on the sample cell (100).
  9. 9. The aerosol particle photoionization system of claim 1, further comprising an aerosol generator (900), wherein a compound storage tank (901) is provided on the aerosol generator (900), wherein a three-way valve (902) is connected to the compound storage tank (901), wherein a compressed air delivery tube (903) is provided at one of the interfaces of the three-way valve (902), wherein a particle filter (904) is connected to the other interface of the three-way valve (902), wherein a drying tube (905) is connected to the output end of the particle filter (904), and wherein the drying tube (905) is in communication with the sample inlet (101) via a pipeline.
  10. 10. An aerosol particle photoionization system as claimed in claim 2, wherein the sample cell (100) is provided with a mounting opening (103), and the ultraviolet lamp (200) is disposed on the mounting opening (103).

Description

Aerosol particle photoionization system Technical Field The invention relates to the technical field of aerosol particle ionization, in particular to an aerosol particle photoionization system. Background The aerosol particle ionization technology is a type of soft ionization technology which ionizes aerosol from neutral particles so as to be convenient for subsequent on-line, rapid and high-sensitivity detection by mass spectrum and other charge measurement technologies, and can play a vital role in the fields of micro-nano manufacturing, environmental monitoring, medicine production and the like, but the following problems exist in the actual measurement process of aerosol particles at present: 1. Current aerosol particle ionization techniques such as electron bombardment ionization tend to produce ion fragments that are difficult to control, resulting in difficulty in studying the actual physical properties and original chemical composition of the aerosol particles, while also failing to perform effective quantitative analysis; 2. For aerosol samples rich in inorganic salts, salt adducts and non-covalent compounds have formed during conventional electrospray ionization, interfering with the generation of ions, resulting in poor stability of the ionization process; 3. The traditional metal electrode is exposed in the air, is influenced by humidity change in the air, is easy to break down under high pressure, and reduces ionization efficiency; 4. Various aerosol soft ionization techniques suffer from ionization path competition, complicating quantitative analysis, producing severe signal baseline drift and memory effects, requiring complex blank-correction cycles, resulting in the loss of standardized aerosol ionization and measurement techniques. For this purpose we have devised an aerosol particle photoionization system aimed at solving the above problems. Disclosure of Invention The invention provides an aerosol particle photoionization system, which is adaptive to a light source unit, a polarized electrode unit and a flow control unit, can ionize aerosol particles in a photoionization mode, can avoid the interference of ion fragments and salt adducts, retains the real components of the aerosol, realizes precise quantification, prevents high-voltage breakdown, and solves the problem that the ionization of the aerosol particles is difficult to control in the background art. The invention provides the following technical scheme: the photoionization system for aerosol particles comprises a sample cell, a light source unit, a polarized electrode unit, a flow control unit and a flow control unit, wherein the sample cell is provided with a sample inlet and a sample outlet, the light source unit is arranged on the sample cell and provided with a light emitting end, the light emitting end is used for generating a light source and irradiating a position corresponding to the sample inlet in the sample cell, the polarized electrode unit is provided with a load pole and a collecting pole, the light emitting end of the light source unit is arranged between the load pole and the collecting pole, the working end of the load pole extends into the sample cell and is arranged at the position of the light emitting end of a light source assembly, the collecting pole is arranged on the sample cell and corresponds to the load pole and is used for collecting aerosol particles, the flow control unit is provided with a limiting hole, the inlet end of the limiting hole is communicated with the sample outlet, and the pressure ratio of the limiting hole is adjusted so as to maintain the flow rate of air flowing through the sample outlet constant. As a preferred technical scheme of the invention, the light source unit comprises an ultraviolet lamp, one end of the ultraviolet lamp is provided with a light emitting window, the light emitting window extends into the sample cell and is matched with the sample inlet, and an ultraviolet beam is formed through the light emitting window and is used for ionizing aerosol particles into aerosol particle ions. As a preferable embodiment of the invention, the photon energy of the ultraviolet lamp is 10.6eV. As a preferable technical scheme of the invention, the polarized electrode unit comprises a polarized electrode voltage stabilizing circuit board, a voltage stabilizing positive electrode output end and a voltage stabilizing negative electrode output end are arranged on the polarized electrode voltage stabilizing circuit board, the voltage stabilizing positive electrode output end is electrically connected with a load electrode through a lead, the voltage stabilizing negative electrode output end is electrically connected with the outer wall of the sample cell through a stainless steel wire, and a detection and analysis assembly is arranged on the acquisition electrode and used for acquiring and analyzing aerosol particle ions in the sample cell. As a preferred technical scheme of the invent