Laser dynamic analysing method for making accurate measurement to construction and city space

A technology of precise measurement and analysis method, which is applied in the power machinery industry and construction field, and can solve the problems of large particle size measurement errors and errors

Inactive Publication Date: 2007-08-22
TONGJI UNIV
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  • Abstract
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AI Technical Summary

Problems solved by technology

Although the Phase Doppler Velocimetry (PDA) system has developed into a relatively complete technology for measuring the size and velocity of spherical particles, there are still problems and difficulties from the principle to the specific application when it comes to the measurement of transparent particles.
Especially when the diameter of the particle exceeds one-third of the measuring body, there will be a very large particle size measurement error
Since the flow rate and concentration are the cubic relationship of the particle diameter, this error will lead to a larger error in the flow rate and concentration measurement

Method used

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  • Laser dynamic analysing method for making accurate measurement to construction and city space
  • Laser dynamic analysing method for making accurate measurement to construction and city space
  • Laser dynamic analysing method for making accurate measurement to construction and city space

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0040] According to the requirements of the experiment, a simulation structure of building and urban space is established. Here, the Tongji New Village residential area in Shanghai is taken as the experimental object, and it is reduced in a fixed experimental flow field according to the ratio of 1:10.

[0041] This experimental device system is as shown in Figure 1 and Figure 6, and the PDA test system device includes: argon ion laser 1, incident optical system (comprising beam splitter and emission lens) 2, receiving optical system (lens and photodetector) 3, Multimode optical fiber 4, signal processor 5 and auxiliary equipment 6 (including computer). Through the test, the particle velocity value of each required point in the building and urban space in the experimental area can be obtained. The double lens mentioned in the technical plan refers to the system composed of the receiving light system and the incident light system; the experimental device originally installed the...

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Abstract

The invention discloses a laser dynamic analysis method (PDA) which can measure architecture and city space accurately. Its steps are: Build a model configuration of architecture and city space and minimize then into a fixed flow field in proportion. Insufflate natural air (tracer particle) into flow field. Blend laser beam radiated by argon ion laser is divided to two or more beam by incidence optical system, which is induced into flow field by focusing lens to form multi-beam converged measuring control system. Utilize receiving optical system to collect scattered beam radiated by tracer particles and transfer optical signal to electric signal which is transformed to readable digital signal by signal processor. Velocity of particles is achieved by autocorrelation technique. Realization device of the method is composed of an argon ion laser, an incidence optical system, a receiving optical system, a multimode fiber, an optic probe, a signal processor and an auxiliary device.

Description

technical field [0001] The invention relates to a laser dynamic analysis method for precise measurement of buildings and urban spaces, that is, to use PDA testing technology to accurately measure buildings and urban spaces, thereby effectively designing and analyzing the entire building and urban space, belonging to architectural , Technical field of power machinery industry. Background technique [0002] Since the advent of laser velocity measurement technology in 1964, it has been more and more widely used in various measurement fields due to its non-contact measurement, no interference with the flow field, high spatial resolution, fast dynamic response, and high measurement accuracy. Laser dynamic particle analysis (PDA—Particle Dynamic Analyzer) is developed on the basis of laser Doppler velocimetry (LDV), and is currently recognized as the most effective instrument for simultaneously measuring particle size and velocity. The principle of LDV is based on the fact that t...

Claims

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Application Information

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IPC IPC(8): G01D21/00G01M19/00G01P3/36G01P5/26G01M99/00
Inventor 杨丽项秉仁张冠增
Owner TONGJI UNIV
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