Pipeline two-dimensional flow field flow velocity measurement system and method based on laser Doppler velocity measurement

Abstract

The invention discloses a pipeline two-dimensional flow field flow velocity measurement system and method based on laser Doppler velocity measurement, and the system comprises a laser which is used for outputting a laser beam; the beam splitter is positioned behind the laser and is used for splitting the laser beam into two parallel measuring light beams which are propagated at equal intensity and equal optical path; the focusing reflection assembly is positioned behind the beam splitter and is used for reflecting and converging the two parallel measurement light beams at a flow field to-be-measured point in the pipeline and returning part of scattered light carrying flow field motion information along an original path to form scattered light to be measured; and the detection assembly is located on the light path of the to-be-detected scattered light and is used for collecting the to-be-detected scattered light. The device is applied to the technical field of pipeline flow velocity measurement, interference of a contact type measuring device on a flow field can be avoided, the problem of complex correction caused by a light incident angle when a traditional laser Doppler velocimeter measures two-dimensional flow field flow velocity distribution can also be avoided, the structure is simple, universality is better, and multi-point measurement is convenient.

Description

technical field [0001] The invention relates to the technical field of pipeline flow velocity measurement, in particular to a two-dimensional flow field flow velocity measurement system and method based on laser Doppler velocity measurement. Background technique [0002] Flow measurement is widely used in industrial production, process control, and scientific experiments. Flow parameters have become an important indicator for measuring economic efficiency, production status, environmental supervision, and product performance. With the improvement of production technology and industrial production automation, higher and higher requirements are put forward for the accuracy, reliability, economy and intelligence of flow measurement. [0003] Existing pipeline flow field measuring devices can be divided into contact measuring devices and non-contact measuring devices. Common contact measuring devices, such as differential pressure flow meters, acoustic flow meters, turbine flow...

AI Technical Summary

Problems solved by technology

These devices mainly have the following two disadvantages: (1) interfere with the flow field, causing the flow field to produce flow velocity distribution distortion, and at the same time increase the average flow velocity of the cross-section where the measuring probe is located; (2) multi-point flow velocity measurement is inconvenient, and the flow velocity distribution in the pipeline is unknown The flow field flow measurement accuracy is low

In order to obtain the flow velocity distribution of the two-dimensional flow field, the laser Doppler velocimeter needs to be installed on the two-dimensional coordinate adjustment frame, and the incident angle of light will bring complicated correction problems

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