Phase-locked amplification method and system in TDLAS gas detection

A technology of lock-in amplification and gas detection, applied in the field of lock-in amplification

Active Publication Date: 2022-02-18
CENT SOUTH UNIV
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  • Application Information

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Problems solved by technology

[0005] The embodiment of the present application provides a phase-locked amplification method and system in TDLAS gas detection, so as to at least solve the problems caused by using a hardware phase-locked loop for phase-locked amplification in gas detection in the prior art

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  • Phase-locked amplification method and system in TDLAS gas detection
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  • Phase-locked amplification method and system in TDLAS gas detection

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Embodiment Construction

[0022] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and embodiments.

[0023] It should be noted that the steps shown in the flowcharts of the accompanying drawings may be performed in a computer system, such as a set of computer-executable instructions, and that although a logical order is shown in the flowcharts, in some cases, The steps shown or described may be performed in an order different than here.

[0024] In this embodiment, a lock-in amplification method in TDLAS gas detection is provided, Figure 4 It is a flow chart of the lock-in amplification method in the TDLAS gas detection according to the embodiment of the present application, such as Figure 4 As shown, the process includes the following steps:

[0025] Step S402, obtaining the amplitu...

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Abstract

The invention discloses a phase-locked amplification method and system in TDLAS gas detection. The method comprises the following steps of acquiring the amplitude and frequency of a modulation current corresponding to a gas to be detected; obtaining a phase angle of a frequency multiplication component in a gas absorption spectrum signal It, wherein the phase angle eta of the frequency multiplication component is a signal deviation phase angle; setting a parameter and taking the parameter as a phase of a k frequency multiplication reference signal; repeatedly adjusting until the k-order harmonic wave is close to an ideal harmonic wave waveform; and obtaining a value when the k-order harmonic wave is close to the ideal harmonic wave waveform, and assigning the value to the phase angle of a double component and the obtained eta to realize phase locking. According to the invention, the problem caused by phase-locked amplification in the gas detection by using a hardware phase-locked loop in the prior art is solved, so that the hardware cost is reduced, and the gas detection precision is improved to a certain extent.

Description

technical field [0001] The present application relates to the field of gas detection, in particular, to a lock-in amplification method and system in TDLAS gas detection. Background technique [0002] Tunable Diode Laser Absorption Spectroscopy (TDLAS for short) technology is a non-contact measurement method of spectroscopy that applies laser technology to absorption spectroscopy measurement technology. Due to its high precision, fast response, high selectivity, non-contact measurement and other advantages, TDLAS technology has been widely used in the field of gas detection, and the second harmonic detection and analysis technology is used in many fields in gas concentration measurement. Get practical online application. [0003] In TDLAS gas detection technology, in order to obtain the second harmonic related to the gas concentration, lock-in amplification technology is essential. By locking the phase relationship between the measured absorption signal and the reference si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/39
CPCG01N21/39G01N2021/399
Inventor 蓝丽娟王一博阳春华罗旗舞桂卫华
Owner CENT SOUTH UNIV
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