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System and method for detecting methyl bromide gas concentration by optosonic spectrometry

A technology of gas concentration and photoacoustic spectroscopy, which is used in measurement devices, material analysis by optical means, instruments, etc., to eliminate the interference of background signals, the device is small in size, and the interference shielding is good.

Inactive Publication Date: 2019-03-19
江苏舒茨测控设备股份有限公司
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Problems solved by technology

[0011] The invention provides a method for detecting the residual concentration of methyl bromide gas by photoacoustic spectroscopy, which solves the detection problem of the concentration of methyl bromide gas

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  • System and method for detecting methyl bromide gas concentration by optosonic spectrometry
  • System and method for detecting methyl bromide gas concentration by optosonic spectrometry
  • System and method for detecting methyl bromide gas concentration by optosonic spectrometry

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Embodiment Construction

[0051] The present invention proposes a device for detecting the residual concentration of methyl bromide gas by means of photoacoustic spectroscopy, comprising an antimonide laser light source, a chopper, a photoacoustic cell, a microphone and a signal processing unit; wherein the antimonide laser light source is connected to the chopper , set on one side of the photoacoustic cell; the microphone is set on the bottom of the photoacoustic cell, the laser light source is emitted to the chopper, and the light is cut by the chopper to form modulated light; the antimonide laser emits light to form a narrow-band modulating spectrum, Irradiate into a photoacoustic cell.

[0052] Using an antimonide laser as the light source 1, it emits monochromatic light of 3.5 microns, and through the mechanical chopper 2, the monochromatic light with adjustable intensity is irradiated into the sealed photoacoustic cell 3, and the gas molecules in the photoacoustic cell 3 absorb After being excite...

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Abstract

The invention provides a system and a method for detecting methyl bromide gas concentration by optosonic spectrometry. The system comprises an antimonide laser light source, a chopper, an optosonic pond, a rheomicrophone and a signal processing unit. The antimonide laser light source is connected to the chopper and is arranged on one side of the optosonic pond; the rheomicrophone is arranged at the bottom of the optosonic pond, the laser light source emits light to the chopper, the chopper chops the light to form modulated light; the antimonide laser light source emits light to form a narrow-bond modulated spectrum to reach the optosonic pond. The system has the advantages of high sensitivity, high stability, good shield interference and small size. According to the principle of measuringmethyl bromide by optosonic spectrometry, no chemical substances are added, and the method is stable in optical structure after calibration primarily after delivery without secondary or multi-time calibration, so that the defects of a conductivity method are also avoided.

Description

technical field [0001] The invention belongs to the technical field of trace gas detection, and in particular relates to a system and method for detecting trace gas concentrations of methyl bromide by using photoacoustic spectroscopy, which is suitable for the detection of fume gas residues such as inspection and quarantine. Background technique [0002] Methyl bromide, molecular formula CH 3 Br, with a relative density of 1.730 (0 / 4°C), also known as methyl bromide, methyl bromide or methyl bromide, is a colorless, odorless gas. It has a strong fumigation effect and can kill various harmful organisms efficiently and broadly. Methyl bromide is commonly used for the fumigation of stored cargo and perishable items, and is sometimes used as a disinfectant for buildings, ships and aircraft. Because methyl bromide is colorless and odorless, in order to ensure the safety of users, about 2% lacrimal agent is often added to this fumigant as an alarm agent. [0003] However, the r...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/17
CPCG01N21/1702G01N2021/1704
Inventor 陈默安德里亚斯·何斯特李茂
Owner 江苏舒茨测控设备股份有限公司
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