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
CN101021430AInactive Publication Date: 2007-08-22TONGJI UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
TONGJI UNIV
Publication Date
2007-08-22
Estimated Expiration
Not applicable · inactive patent

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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.
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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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