Safety door inspector based on photoionization detecting technology

A technology of photoionization and detection device, which is applied in measurement devices, instruments, scientific instruments, etc., can solve problems such as difficulty in adapting to detection requirements, and achieve the effect of enhancing sensitivity and working stability, improving sensitivity and high sensitivity

Inactive Publication Date: 2008-08-27
ANHUI INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the shortcomings of the existing traditional photoionization detectors that the collection plate is directly connected to the power supply, and the conventional sample feeding method is difficult to meet the detection requirements, and to provide a technology based on photoionization detectors. safety door detection device

Method used

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  • Safety door inspector based on photoionization detecting technology
  • Safety door inspector based on photoionization detecting technology
  • Safety door inspector based on photoionization detecting technology

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Embodiment Construction

[0030] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0031] Such as figure 1 and figure 2 As shown, the vacuum pump 14 draws the detectable gas 6 into the photoionization chamber 10 through the air inlet pipe 12, and the vacuum ultraviolet lamp 3 emits ultraviolet light to bombard the gas molecules, making them ionized into positively charged ions 7 and Negatively charged electrons 8, under the action of the electric field between the polarized plates 1 and 2, the ions 7 and electrons 8 drift to the two poles respectively, and hit the two poles 1 and 2, causing the induced charge amount of the collecting plate 11 to change, thereby A weak ionic current is formed that can be detected. After the current signal is amplified into a voltage signal by the high-sensitivity micro-current amplifier 4, it enters the analysis and processing unit 5. The detected gas is recombined to the initial state gas 9 and di...

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Abstract

A safety door detection device based on light ionization detector is prepared as connecting air inlet of preheating air chamber to air outlet of vacuum pump and connecting air inlet of preheating air chamber to air inlet pipe of light ionization detector through solenoid valve; using power supply system to provide power for vacuum pump, preheating air chamber, solenoid valve, light ionization detector and digital display.

Description

technical field [0001] The invention relates to a chemical analysis instrument, in particular to a detection device for trace organic chemical dangerous goods. Background technique [0002] As we all know, the detection of dangerous goods is playing an increasingly important role in real life, and it is directly related to personal safety and social stability. The detection accuracy of the existing safety detection devices for organic chemical dangerous goods is not high enough, and it is difficult to meet the needs of civil aviation, railway and other system safety inspection departments for the detection of trace substances. [0003] Portable Photoionization Detector (PID) is a detection instrument that works under normal temperature and pressure. The principle is: two electrodes parallel to each other are placed in the ionization chamber, the electrodes are insulated from each other and connected to the positive and negative terminals of the high voltage power supply res...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/66
Inventor 张颿魏庆农张伟
Owner ANHUI INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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