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Multi-component detection device and method based on temperature tuning absorption spectrum technology

An absorption spectrum and detection device technology, which is applied in the field of multi-component detection devices based on temperature-tuned absorption spectrum technology, can solve problems such as increased cost and the like

Pending Publication Date: 2021-05-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] If you want to measure more components, you must use multiple lasers, and you must also be equipped with corresponding gas chambers or gas chamber channels. The main controller must also allocate resources for control and algorithm processing, which increases the cost.

Method used

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  • Multi-component detection device and method based on temperature tuning absorption spectrum technology
  • Multi-component detection device and method based on temperature tuning absorption spectrum technology
  • Multi-component detection device and method based on temperature tuning absorption spectrum technology

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Embodiment 1

[0059] Such as figure 1 As shown, the multi-component detection device based on temperature-tuned absorption spectroscopy technology of the present invention includes the following parts:

[0060] A temperature controller for controlling the temperature scanning range;

[0061] A semiconductor laser for providing a laser light source with a suitable scan period and scan resolution;

[0062] The constant current source with modulation provides the driving current with modulation signal for the semiconductor laser, directly adopts the adjustable constant current source available in the market;

[0063] Long-range gas chamber, the laser light emitted by the semiconductor laser is collimated and then guided into the long-range gas chamber, and then emitted to the detector after multiple reflections;

[0064] The detector converts the optical power of the laser into a current signal;

[0065] The preamplifier converts the current signal output by the detector into a voltage sign...

Embodiment 2

[0073] Such as figure 2 As shown, this embodiment provides a method for gas detection with a multi-component detection device based on the temperature-tuned absorption spectroscopy technology described in Embodiment 1, including the following steps:

[0074] The first step is to fill the long-range gas chamber with an appropriate amount of gas to be detected;

[0075] In the second step, the temperature output range of the temperature controller is determined according to the wavelength scanning range of the gas to be detected, and then the voltage variation range applied to the temperature controller is determined;

[0076] The third step is to determine the scanning period and scanning resolution according to the thermal load time response characteristics of the semiconductor laser;

[0077] In the fourth step, the constant current source with modulation signal provides driving current for the semiconductor laser, and the laser light emitted by the semiconductor laser is c...

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Abstract

The invention relates to the technical field of gas detection, in particular to a multi-component detection device based on a temperature tuning absorption spectrum technology. The multi-component detection device comprises a temperature controller, a semiconductor laser, a constant current source with modulation, a long-range gas chamber, a detector, a preamplifier, a lock-in amplifier and a main controller. The invention further provides a method adopting the device for detection. The method specifically comprises the steps that a long-range gas chamber is filled with gas, a temperature output range of a temperature controller and a scanning period and a resolution ratio of a semiconductor laser are determined, laser emitted by the semiconductor laser is guided into the long-range gas chamber after being collimated, light current signals are converted into voltage signals DC after passing through a detector and a pre-amplifier, the voltage signals DC are output to a lock-in amplifier, and the lock-in amplifier extracts a second harmonic signal 2f, sends the second harmonic signal 2f and the voltage signal DC to the main controller, and calculates the concentration of each component in the gas by using a concentration inversion method. According to the multi-component detection device, simultaneous detection of multiple components of the gas is realized by only one laser, so that the cost is saved.

Description

technical field [0001] The invention relates to the technical field of gas detection, in particular to a multi-component detection device and method based on temperature-tuned absorption spectroscopy technology. Background technique [0002] In industrial processes, especially chemical industry processes, such as natural gas chemical industry, petrochemical industry, coal chemical industry, chlor-alkali chemical industry, fine chemical industry and other fields, there is a large demand for multi-component concentration monitoring of gases. Traditional techniques for multi-component detection include chromatography, Raman spectroscopy, fluorescence spectroscopy, and non-dispersive infrared techniques such as NDIR. However, compared with the modulation absorption spectroscopy technique, their sensitivity is low and the response time is slow. If TDLAS implements multi-component analysis according to this scheme, its performance in all aspects will be improved compared with tra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/39
CPCG01N21/39
Inventor 李玉荣季文海
Owner CHINA PETROLEUM & CHEM CORP
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