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Gaseous mercury concentration detection device and method on basis of ring resonator frequency doubling structure

A ring resonant cavity and concentration detection technology, applied in the detection field, can solve the problems of low frequency doubling efficiency and low measurement signal-to-noise ratio, and achieve the effects of improving frequency doubling efficiency, expanding the selection range, and enhancing the fundamental frequency optical power.

Inactive Publication Date: 2019-01-18
HANGZHOU DIANZI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the existing gaseous element mercury concentration detection device and method based on frequency doubling technology have low frequency doubling efficiency, need to use photomultiplier tubes for measurement, and have low measurement signal-to-noise ratio, and propose a method based on ring resonance A device for detecting the concentration of gaseous elemental mercury with a cavity frequency doubling structure, and a method for detecting the concentration of gaseous elemental mercury using the device

Method used

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  • Gaseous mercury concentration detection device and method on basis of ring resonator frequency doubling structure
  • Gaseous mercury concentration detection device and method on basis of ring resonator frequency doubling structure
  • Gaseous mercury concentration detection device and method on basis of ring resonator frequency doubling structure

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Effect test

Embodiment 1

[0029] Such as figure 1 As shown, the gaseous mercury concentration detection device semiconductor laser 1, grating 2, mode matching mirror 2, half-wave plate 4, ring resonator, BBO crystal 5, dichroic mirror 6, beam splitter 7, reference gas chamber 8, detection Gas chamber 9, three mirrors and two detectors.

[0030] The output wavelength of the semiconductor laser 1 is 507.3±2 nm or 730.2±2 nm, and the output light intensity is greater than or equal to 10 mW. The output optical path of the semiconductor laser 1 is provided with a grating 2, a first reflection mirror 16, a mode matching mirror 3, a half-wave plate 4, a coupling mirror 10, a first high reflection mirror 11, a second high reflection mirror 12, and a third high reflection mirror. Mirror 13.

[0031] The output wavelength of the semiconductor laser 1 is adjusted by adjusting the angle of the grating to achieve feedback adjustment, which can reach 507.3 nanometers or 730.2 nanometers accurately. The light beam...

Embodiment 2

[0044] The output wavelength of the semiconductor laser 1 is 505 nanometers, and the output light intensity is 35 milliwatts. The output wavelength of the laser can be adjusted to 507.3 nanometers by adjusting the grating angle to achieve feedback adjustment. The length of the reference air chamber is 1 mm, and the internal mercury vapor concentration is converted by the ambient temperature. When the ambient temperature is 20 degrees Celsius, the internal mercury vapor concentration is 14.066ng / cm 3 . The detection chamber length is 200 cm. The gas to be tested flows into the detection gas chamber through the gas pipe.

[0045] After processing through lock-in amplification, it is obtained as figure 2 The 2nd harmonic signal shown. Wherein, the dotted line is the signal of the reference road, and the solid line is the signal of the road to be tested. It can be seen from the figure that the maximum amplitude A of the second harmonic signal appears on the reference circuit ...

Embodiment 3

[0047] The output wavelength of the semiconductor laser 1 is 730 nanometers, and the output light intensity is 10 milliwatts. The output wavelength of the laser is adjusted by feedback by adjusting the angle of the grating to make it accurate to 730.2 nanometers. The length of the reference air chamber is 4 mm, and the internal mercury vapor concentration is converted by the ambient temperature. When the ambient temperature is 25 degrees Celsius, the internal mercury vapor concentration is 21.1445ng / cm 3 . The detection chamber length is 100 cm. The gas to be tested flows into the detection gas chamber through the gas pipe.

[0048] After being processed by phase-locked amplification, the 2nd harmonic signal is obtained. The reference path signal is 0.0006, and the sample path signal is 0.0002. The amplitude of the two signals is calculated by the formula described in the technical plan, and the concentration of the gaseous element mercury to be detected is calculated as 0....

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Abstract

The invention relates to a gaseous mercury concentration detection device and method on the basis of a ring resonator frequency doubling structure. An existing mercury vapor concentration detection device is short in service life and high in fluctuation of measurement result. The gaseous mercury concentration detection device comprises a semiconductor laser, an optical grating, a pattern matchingmirror, a half-wave plate, a ring resonator, BBO crystals, a dichroic mirror, a beam splitter, a reference air chamber, a detection air chamber and a two detectors. Output wavelength of the semiconductor laser is 507.3 or 730.2 nm. During detection, the laser is started, signals produced by the two detectors are received, lock-in amplification is performed on the two signals, and a maximum secondharmonic signal is obtained; maximum amplitude of the second harmonic signal in the reference air chamber is recorded, and at the same position of a signal of the detection air chamber, amplitude of the second harmonic signal of the detection air chamber is obtained; and mercury concentration in to-be-detected gas is calculated and obtained. The gaseous mercury concentration detection device expands a light source selection range, improves frequency doubling conversion efficiency, device sensitivity and detection accuracy and realizes real-time monitoring on elemental mercury concentration.

Description

technical field [0001] The invention belongs to the technical field of detection, and relates to a device and method for detecting the concentration of mercury, a gaseous element, based on a frequency doubling structure of a ring resonant cavity. Background technique [0002] Mercury is a substance that can damage the nervous system and liver. Mercury vapor is emitted from boiler flue gas, coal combustion, cement production, waste incineration, and non-ferrous metal smelting. The situation of mercury pollution in my country is severe. According to the Global Mercury Assessment 2013 report of the United Nations Environment Program (Global Mercury Assessment 2013), China's anthropogenic mercury emissions accounted for 40% of the world's total in 2010. In order to limit the excessive discharge of mercury, an instrument that can accurately measure the concentration of elemental mercury vapor is needed in the market. Mercury vapor concentration detection devices currently on t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/39
CPCG01N21/39
Inventor 林宏泽蒋鹏佘青山席旭刚林广吴翔魏凯华
Owner HANGZHOU DIANZI UNIV
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