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Calibration-free modulation spectrum measuring system

A technology for modulating spectrum and measurement system, which is applied in the field of universal and reliable measurement system, which can solve problems such as changes and deviation of measurement results, and achieve the effect of simplifying requirements, complete functions, and reducing the amount of simulation calculation

Inactive Publication Date: 2014-06-11
PLA PEOPLES LIBERATION ARMY OF CHINA STRATEGIC SUPPORT FORCE AEROSPACE ENG UNIV
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Problems solved by technology

Although the initial light intensity can be measured in advance, in the environment with severe interference, the attenuation caused by many non-absorbing factors will cause the initial light intensity to change significantly during the measurement process, and the measurement results will have serious deviations at this time
Therefore, this method does not really achieve calibration-free measurement and can only be applied under laboratory conditions

Method used

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Embodiment Construction

[0019] Specific implementation plan

[0020] The calibration-free modulation spectrum measurement system of the present invention will be further described in detail with reference to the drawings and implementation cases. figure 1 The block diagram of the program module composition of the present invention is given.

[0021] The measurement system of the present invention is divided into three modules as a whole, namely, a digital phase-locked signal demodulation module, a modulation spectrum simulation module, and a measurement parameter extraction module. Each module has relatively independent functions and compatible input and output interfaces, which are convenient to call and transplant.

[0022] The calibration-free modulation spectrum measurement system of the present invention has the following steps:

[0023] Step 1: Establish a software platform

[0024] The measurement system is developed based on the LabVIEW software platform, and realizes the functions of signal acquisiti...

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Abstract

The invention establishes a calibration-free modulation spectrum measuring software system based on a tunable diode laser absorption spectrum by virtue of a wavelength modulation technique adapted to a severe environment. The system comprises a digital phase-locking signal demodulation module, a modulation spectrum simulation module and a measured parameter extraction module which comprise 14 sub-modules. The system has the specific functions that a photoelectric signal is demodulated by virtue of a digital phase-locking algorithm so as to obtain a harmonic signal; a simulation database of the harmonic signal can be obtained by carrying out accurate theoretical calculation; the speed, temperature and constituent concentration of a flow field can be extracted by combining the harmonic signal with the simulation database.

Description

Technical field [0001] The invention belongs to the field of optical measurement technology, relates to methods such as signal processing and numerical simulation, and provides a universal and reliable measurement system developed for the absorption spectrum measurement of gas phase molecules. Background technique [0002] Optical measurement technology has been widely used in scientific research experiments, environmental monitoring and combustion field diagnosis. In theory, absorption spectroscopy requires simultaneous measurement of light intensity information before and after absorption to obtain molecular absorption information. In practical applications, methods such as reference beam or function fitting are often used to determine the light intensity before absorption, that is, the spectral baseline. These methods are difficult to obtain accurate spectral baseline information. In addition, although the modulation method can significantly improve the signal-to-noise ratio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/39
Inventor 洪延姬王广宇潘虎赵文涛
Owner PLA PEOPLES LIBERATION ARMY OF CHINA STRATEGIC SUPPORT FORCE AEROSPACE ENG UNIV
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