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A Rapid Temperature Extraction Method Based on Laser Absorption Spectroscopy

A technology of laser absorption spectrum and extraction method, applied in the field of tunable diode laser absorption spectrum, can solve the problems of fast calculation method and system without temperature extraction, etc.

Active Publication Date: 2020-11-03
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is currently no fast calculation method and system for temperature extraction suitable for hardware implementation

Method used

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  • A Rapid Temperature Extraction Method Based on Laser Absorption Spectroscopy
  • A Rapid Temperature Extraction Method Based on Laser Absorption Spectroscopy
  • A Rapid Temperature Extraction Method Based on Laser Absorption Spectroscopy

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Embodiment Construction

[0048] The present invention will be further explained below in conjunction with examples.

[0049] In this example, the gas to be measured is given uniform environmental parameters, including pressure, temperature, gas concentration, and the path length of the laser passing through the gas to be measured, and then the HITRAN database theory is used to calculate the selected laser absorption spectrum to pass through the gas to be measured The latter absorption spectrum is used as the measurement data, and finally the temperature value of the gas to be measured is extracted using the temperature rapid extraction model. The temperature extraction flowchart is as follows figure 1 As shown, it includes the following steps:

[0050] Step 1. Theoretical calculation of the absorption spectrum of the selected laser absorption spectrum line passing through the gas to be measured under the given environmental parameters. A typical structure diagram of the temperature rapid extraction system...

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Abstract

The invention proposes a rapid temperature extraction method based on laser absorption spectrum, which belongs to the technical field of tunable diode laser absorption spectrum and is used for rapid temperature extraction of gas to be measured. The rapid temperature extraction method includes the following steps: obtaining the absorption spectrum of the wavenumber-scanned laser passing through the gas to be measured; calculating the first-order differential and second-order differential of the absorption spectrum versus wavenumber variation curve; establishing a temperature rapid extraction model; using multiple linear regression The algorithm solves the temperature rapid extraction model, and then extracts the temperature value of the gas to be measured. The invention can quickly extract the temperature by using only one laser absorption spectrum, effectively utilizes the shape information of the absorption spectrum, and simplifies the traditional double absorption spectrum line temperature extraction method. At the same time, the fast temperature extraction method has short calculation time, is suitable for hardware implementation, and has broad prospects in real-time temperature measurement.

Description

Technical field [0001] The present invention proposes a rapid temperature extraction method based on laser absorption spectrum, which belongs to the technical field of tunable diode laser absorption spectrum. This method is used to quickly extract the temperature of the gas to be measured using a laser absorption spectrum. Background technique [0002] Tunable Diode Laser Absorption Spectroscopy (TDLAS) technology is widely used in the measurement of combustion field temperature and typical product concentration due to its advantages of non-invasiveness, high speed, accurate measurement, simple system, low cost, and strong anti-interference ability. . In 2019, Chang Liu et al. published a paper "Laser absorption spectroscopy" (Laser absorption spectroscopy) in "Applied Spectroscopy Reviews" (Applied Spectroscopy Reviews), Volume 54, Issue 1, Pages 1-44. For combustion diagnosis in reactive flows: Areview), the progress of laser absorption spectroscopy in key principles, sensors...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K11/32
CPCG01K11/32
Inventor 曹章邱爽徐立军黄昂杨亚如
Owner BEIHANG UNIV