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Harmonic wavelet analysis method for modulating spectral signals

A harmonic wavelet and modulated spectrum technology, applied in the field of optical measurement, can solve problems such as inaccurate results, affecting the detection accuracy of TDLAS technology, and multi-impurity signals

Active Publication Date: 2014-06-25
PLA PEOPLES LIBERATION ARMY OF CHINA STRATEGIC SUPPORT FORCE AEROSPACE ENG UNIV
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Problems solved by technology

For example, Li Hejie proposed in his doctoral dissertation "NEAR-INFRARED DIODE LASER ABSORPTION SPECTROSCOPY WITH APPLICATIONS TO REACTIVE SYSTEMS AND COMBUSTION CONTROL": 46-50 to use digital phase-locking method to detect harmonic signals of TDLAS modulation signals, but the method The detected signal contains more impurity signals, the result is not very accurate, which affects the detection accuracy of TDLAS technology

Method used

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  • Harmonic wavelet analysis method for modulating spectral signals
  • Harmonic wavelet analysis method for modulating spectral signals
  • Harmonic wavelet analysis method for modulating spectral signals

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Embodiment Construction

[0032] The present invention will be further described below in conjunction with the accompanying drawings.

[0033] refer to figure 1 , the specific implementation steps of the present invention are as follows:

[0034] Step 1. Establish the harmonic wavelet expression.

[0035] The classical harmonic wavelet expression is as follows:

[0036] h ( t ) = h e ( t ) + i h o ( t ) = [ exp ( i ...

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Abstract

The invention discloses a harmonic wavelet analysis method for modulating spectral signals. The harmonic wavelet analysis method is based on the wavelength of a TDLAS, and includes the implementation steps of (1) building a harmonic wavelet equation of the modulated spectral signals of the TDLAS, (2) computing the harmonic wavelet expansion coefficients of the signals with a decomposition algorithm, (3) determining decomposition layer numbers required by signal analysis according to the corresponding relation between wavelet decomposition layer numbers and analysis frequency bands, (4) retaining the harmonic wavelet coefficients of the required frequency bands, and obtaining the signals of the frequency bands through Fourier transformation, (5) constructing an envelope function of the frequency bands, and (6) carrying out an envelope taking process on the signals of the frequency bands to obtain frequency doubling signals of the modulated signals of the TDLAS.

Description

technical field [0001] The invention belongs to the field of optical measurement technology, and further relates to a Tunable Semiconductor Laser Absorption Spectrum (TDLAS) modulation signal analysis method based on the harmonic wavelet principle, which can be used for the measurement of gas temperature, concentration and airflow velocity based on TDLAS technology . Background technique [0002] Tunable Diode Laser Absorption Spectroscopy (TDLAS) technology stands out among many new measurement technologies due to its outstanding advantages such as being less affected by the gas environment, fast response speed, high reliability, and will not cause disturbance to the measured environment, and has been widely valued. The wavelength modulation spectrum technology in the TDLAS technology performs high-frequency modulation on the laser light intensity, which can be applied in a noisy environment, so it is widely used. Wavelength modulation spectrum technology uses high-frequen...

Claims

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Application Information

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IPC IPC(8): G06F19/00
Inventor 金星王广宇周鑫
Owner PLA PEOPLES LIBERATION ARMY OF CHINA STRATEGIC SUPPORT FORCE AEROSPACE ENG UNIV
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