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In-place measurement method and device for gas

A measurement method and a technology of a measurement device, which are applied in the direction of measurement devices, color/spectral characteristic measurement, and testing moving fluid/granular solids, etc., can solve problems such as large impact, increased measurement cost, and low measurement accuracy of gas sensors, and achieve Low cost, cost reduction, and high measurement accuracy

Active Publication Date: 2012-01-11
FOCUSED PHOTONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] 1. The measurement accuracy of the gas sensor is low, and it is greatly affected by gas pressure and temperature
[0011] 2. Restricted by the measurement principle, the response time of the gas sensor is long and cannot be measured in real time
[0012] 3. Poor stability, the performance of the gas sensor decreases rapidly with the increase of use time
[0013] 4. The life of the gas sensor is short, and the sensor that is constantly replaced also increases the cost of measurement

Method used

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  • In-place measurement method and device for gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Such as figure 2 As shown, an in-situ measuring device for oxygen in an incinerator, the temperature in the incinerator is about 1223K, and the measuring device includes:

[0057] The light emitting unit 14 includes a laser 25 and a driving module, the output light frequency of the laser 25 includes a frequency v corresponding to the absorption line I of oxygen 1 =13164.18cm -1 , corresponding to the frequency v of the absorption line II of oxygen 2 =13163.78cm -1 . When the driving module works, the frequency of the output light of the laser 25 can sweep the above frequency. Such as Figure 4 As shown, under unit concentration and unit light path, at the absorption line I of oxygen, the absorption at high temperature (1223K) is much higher than the absorption at normal temperature (300K), more than 15 times.

[0058] The light receiving unit 15 includes a detector 20, and the selection of the detector 20 is a prior art in the field, and details are not repeated ...

Embodiment 2

[0081] Such as image 3 As shown, an in-situ measuring device for oxygen in an incinerator, the temperature in the incinerator is about 1223K, and the measuring device includes:

[0082] The light emitting unit 8 includes a laser 27, a driving module, and an optical splitter 5, and the output light frequency of the laser 27 includes a frequency v corresponding to the absorption line I of oxygen 1 =13164.93cm-1 , corresponding to the frequency v of the absorption line II of oxygen 2 =13164.69cm -1 . When the driving module works, the output light frequency of the laser 27 can sweep the above frequency. Such as Figure 5 As shown, under unit concentration and unit light path, at the absorption line I of oxygen, the absorption at high temperature (1223K) is much higher than the absorption at normal temperature (300K), more than 8 times.

[0083] The light-receiving unit 6 includes a detector 28, and the selection of the detector 28 is a prior art in the field, and details ar...

Embodiment 3

[0107] A kind of in-situ measuring device of oxygen in the incinerator, different from embodiment 2 is:

[0108] 1. Instead of installing an optical splitter, set the first optical switch in the measurement optical path (the optical path formed between the laser and the detector by the measuring light), and set the first optical switch in the calibration optical path (the calibration light is formed between the laser and the detector) The second optical switch is set in the optical path).

[0109] When in the measuring state, the first optical switch is turned on and the second optical switch is turned off; when in the calibration state, the first optical switch is turned off and the second optical switch is turned on.

[0110] 2. The total optical path of the measuring light in the purging gas is 0.3m, and the oxygen content in the purging air is 21%; the measuring optical path in the combustion furnace is 3m, and the oxygen content is about 10%; In the process, at the absor...

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Abstract

The invention relates to an in-place measurement device for gas. The device is characterized by comprising a laser, a detector, an analysis unit, a purging unit and a calibration unit, wherein the frequency of output light corresponds to absorption lines, namely an absorption line I and an absorption line II of gas to be detected; at the unit concentration and in a unit optical path, the absorption rate of the gas to be detected in detected gas is not lower than 5 times that of the gas to be detected in purging gas due to the temperature difference between the detected gas and the purging gasat the position of the absorption line I; the detector is used for receiving measurement light which passes through the purging gas and the detected gas and corresponds to the absorption line I or calibration light which passes through calibration gas of the gas to be detected and corresponds to the absorption line II; the analysis unit is used for acquiring the content of the gas to be detected in the detected gas according to a signal of the detector; the purging unit is used for providing gas to purge a measurement light path outside the area of the detected gas, and the purging gas comprises the gas to be detected; and the calibration unit comprises the calibration gas of the gas to be detected. The device has the advantages of high measurement accuracy, low cost and the like.

Description

technical field [0001] The invention relates to gas measurement, in particular to a method and device for on-site measurement of high-temperature gas using gas absorption spectroscopy. Background technique [0002] In the field of waste incineration, in order to control the combustion efficiency in the combustion furnace, it is necessary to accurately and timely monitor the O in the combustion furnace. 2 content. O in the furnace 2 The concentration measurement range is 0-25%, and the temperature range is 800-900°C. [0003] At present, laser absorption spectroscopy gas analysis devices based on DLAS (Diode Laser Absorption Spectroscopy) technology are widely used in gas measurement. The basic principle of DLAS technology is: tune the wavelength of the measurement light so that it corresponds to the absorption line of the gas to be measured; the measurement light passes through the gas to be measured and is converted into an electrical signal by the detector, and the meas...

Claims

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Application Information

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IPC IPC(8): G01N21/31
CPCG01N21/85G01N21/15G01N21/39G01N2021/151G01N2021/399G01N2021/8578
Inventor 黄伟顾海涛
Owner FOCUSED PHOTONICS
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