Mercury gas detection device based on synchronous scanning and frequency semiconductor laser

A technology of synchronous scanning and detection device, applied in the direction of color/spectral characteristic measurement, etc., can solve the problems of insufficient linear range of measurement concentration, unstable absorption signal, and insufficient detection limit, so as to expand the linear measurement range of system concentration, suppress the The effect is good, and the effect of increasing the probability of wavelength matching

Inactive Publication Date: 2017-02-15
SUZHOU RUILAN ENVIRONMENTAL PROTECTION TECHCO LTD
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  • Abstract
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing mercury lamp-based mercury gas monitoring technology faces the problem of short light source life and high maintenance cost, and the absorption signal instability faced by the existing mercury gas monitoring technology based on sum-frequency laser , the detection limit is not low enough, and the linear range of the measured concentration is not wide enough, etc., a mercury gas detection device based on a synchronous scanning and frequency semiconductor laser is provided

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  • Mercury gas detection device based on synchronous scanning and frequency semiconductor laser

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specific Embodiment approach 1

[0036] Specific implementation mode 1: the following combination figure 1 This embodiment is described. The gaseous element mercury concentration detection device based on a frequency-doubled semiconductor laser in this embodiment includes a red semiconductor laser 1, a blue semiconductor laser 2, a dichroic mirror 3, an achromatic convex lens 4, and barium metaborate ( BBO) crystal 5, convex lens 6, first UV high reflection mirror 7, second UV high reflection mirror 8, beam splitter 9, switchable mercury cell holder 10, reference mercury cell 11, zero gas cell 12, third ultraviolet high Mirror 13, sample gas cell 15, first detector 14, second detector 16, signal control analyzer 17.

[0037] The current and temperature control output terminals of the signal control analyzer 17 are connected to the current and temperature control input terminals of the red semiconductor laser 1 and the blue semiconductor laser 2. The light beam emitted by the blue semiconductor laser 2 is reflec...

specific Embodiment approach 2

[0039] Specific embodiment 2: This embodiment is a further description of specific embodiment 1. The output wavelength of the red semiconductor laser 1 is in the range of 650~710nm, and the output power is not less than 20mW; the output wavelength of the blue semiconductor laser 2 is 395~ Within the range of 415nm, the output power is not less than 10mW.

specific Embodiment approach 3

[0040] Specific embodiment 3: This embodiment is a further description of specific embodiment 1. The focal lengths of the achromatic convex lens 4 and the convex lens 6 are in the range of 1-15 cm.

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Abstract

The invention discloses a gaseous element mercury concentration detection device based on two semiconductor lasers, which comprises a laser controller, a red light semiconductor laser, a blue light semiconductor laser, a dichroic mirror, an achromatic convex lens, barium metaborate (BBO) crystals, a convex lens, an ultraviolet high-reflective mirror, a light splitter, a reference mercury pool, a zero gas pool, a sample mercury pool, a switchable mercury pool base, a detector and a signal control analyzer. A main technology covered by the gaseous element mercury concentration detection device is an interpolation method; real-time monitoring on element mercury concentration is implemented; the requirements on emission and monitoring of industrial mercury are met.

Description

Technical field [0001] The invention belongs to the field of online monitoring of industrial mercury emissions, and specifically relates to a mercury gas detection device based on synchronous scanning and frequency semiconductor lasers. Background technique [0002] Mercury is recognized as a toxic pollutant that can seriously damage the human nervous system. 30% of mercury pollution in the atmosphere comes from man-made emissions, especially from coal-fired thermal power plants. In order to reduce the harmful effects of mercury on the environment and human health, more than 100 countries, including China, signed the Minamata Convention on Mercury in 2013. Whether it is real-time monitoring of industrial mercury emissions or effective evaluation of mercury removal efficiency, efficient mercury measurement technology is required. Traditional mercury gas measurement technology uses wet chemical method (mainly Ontario method). Although this method has high sensitivity, it takes a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31
CPCG01N21/31
Inventor 娄秀涛张铁林宏泽万莉王俊楠何赛灵
Owner SUZHOU RUILAN ENVIRONMENTAL PROTECTION TECHCO LTD
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