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Photo ionization detector ionization chamber and photo ionization detector

A photoionization and ionization chamber technology, applied in instruments, circuits, discharge tubes, etc., can solve the problems affecting the detection sensitivity and measurement accuracy of the photoionization detector, uneven distribution of the gas to be measured, and difficulty in light utilization efficiency of the light source, etc. It can improve the ionization and acquisition efficiency, improve the detection rate and signal processing quality, and improve the sensitivity.

Pending Publication Date: 2019-06-14
CHONGQING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the deceleration discs installed at the air inlets of photoionization detectors on the market are all rectangular arrays of circular air holes, but the cavity of the ionization chamber is usually cylindrical, and the gas enters the cylindrical ionization chamber through the rectangular deceleration discs. When the gas to be measured is unevenly distributed in space, due to the congenital reasons of the PID light source itself, the output photon wavelength is short, the attenuation in the atmosphere is fast, and the manufacturing process of the PID light source is difficult. Utilization efficiency leads to uneven gas ionization, which affects the detection sensitivity and measurement accuracy of photoionization detectors

Method used

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  • Photo ionization detector ionization chamber and photo ionization detector
  • Photo ionization detector ionization chamber and photo ionization detector
  • Photo ionization detector ionization chamber and photo ionization detector

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Embodiment 1

[0019] An ionization chamber of a photoionization detector of the present invention comprises a cylindrical ionization chamber main body configured with an ionization chamber, an electrode plate fixedly arranged in the ionization chamber, and two ends of the ionization chamber main body form an airflow inlet and a The light entrance, the side of the main body of the ionization chamber constitutes the airflow outlet, and the electrode plates are vortex-shaped positive polarizing plates and vortex-shaped negative polarizing plates arranged in parallel intervals, and the negative polarizing plates are made of non-conductive materials formed and plated with a conductive layer, said conductive layer constituting the collecting plate. A plurality of exhaust gas discharge through holes are further opened under the side wall of the ionization chamber, and the diameter of the through holes is preferably the diameter of the gas inlet.

[0020] Specifically, the positive polarized plate ...

Embodiment 2

[0031] Further, a deceleration plate is fixedly arranged at the airflow inlet, and a number of round air holes are arranged on the deceleration plate for ventilation. For example, a circular hole with a diameter of 0.5 mm, wherein the circular air holes of the air speed brake are arranged in a circular array; the total air hole diameter of the air speed brake is the same as the diameter of the cavity inside the ionization chamber.

[0032]The ionization chamber adopts a circular array speed brake structure installed on the upper part of the main body of the ionization chamber, so that the gas to be measured entering the ionization chamber can flow into the ionization chamber uniformly and at a constant speed, so that it can be fully irradiated by ultraviolet light and increase Increased the probability of gas molecules being ionized; for the speed brake, it is preferably a circular flat plate and a rectangular array of vent holes, and a further preferred circular flat plate and...

Embodiment 3

[0034] A photoionization detector, comprising the ionization chamber of the photoionization detector, an ultraviolet lamp fixedly connected to the ionization chamber of the photoionization detector, and a signal amplification processing circuit, wherein the output of the ultraviolet lamp The window, the airflow inlet and the axis of the vortex polarizing plate are arranged coaxially.

[0035] The symmetrical PCB layout adopted by the signal processing circuit, and the arrangement of originals on the top layer and bottom layer all improve the accuracy of the circuit. The amplifier uses a high-performance logarithmic amplifier or a precision operational amplifier to amplify weak voltage signals. Due to its own structure, the logarithmic amplifier has different amplification capabilities for voltage signals of different orders of magnitude, and can measure a wider range of signals. The precision operational amplifier can Minimizing errors makes this circuit network more precise. ...

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Abstract

The invention discloses a photo ionization detector ionization chamber and a photo ionization detector, and relates to the technical field of inspection and detection. The ionization detector ionization chamber comprises a polytetrafluoroethylene air brake, a PID ultraviolet lamp, polar plates, an air inlet and an air outlet. The main body of the ionization chamber is of a cylindrical structure formed into an ionization cavity, the polytetrafluoroethylene air brake formed into the air inlet is arranged at the top of the ionization cavity, the air outlet is formed at the side part of the ionization cavity, and a light inlet is formed in the bottom of the ionization chamber. The whole ionization chamber is designed to be an axial flowing type, the direction of the air is inversely parallel to the radiation direction of the ultraviolet lamp, and perpendicular to the direction of and electric field, so that the condition that the air is fully ionized. The photo ionization detector ionization chamber provided by the invention has the advantages of being simple in assembly structure, stable in mechanical structure, good in electrical connection, and convenient to dismount and replace theultraviolet lamp.

Description

technical field [0001] The invention belongs to the technical field of gas detection, and in particular relates to an ionization chamber of a photoionization detector and a photoionization detector. Background technique [0002] PID (Photo Ionization Detection) technology as an accurate and effective detection method of total volatile organic compounds (TVOCs) has been widely used. The basic principle of PID is to use the ultraviolet light generated by the vacuum discharge phenomenon of inert gas. When a gas molecule with an ionization potential less than or equal to the energy of ultraviolet light absorbs a photon, ionization occurs to generate positively charged ions and electrons. In the ionization chamber, ions and electrons move quickly to the metal electrode under the action of an external electric field, and a micro-current signal is generated between the two electrodes. The current signal is amplified by a weak signal amplification circuit to detect the concentration...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/66H01J47/02
Inventor 王金梅朱思蒙郑培超张秦望刘一帆颜渤汶郑昆朋
Owner CHONGQING UNIV OF POSTS & TELECOMM
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