Optical device for determining flow speed and flow of special fluid
A fluid flow velocity and flow measurement technology, which is applied in fluid velocity measurement, measuring devices, liquid/fluid solid measurement, etc., can solve the problems of long optical path, bulky volume, and high price, so as to avoid blocking the optical path, improve signal-to-noise ratio, Guaranteed strength effect
Inactive Publication Date: 2018-11-13
NANJING UNIV OF SCI & TECH
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Problems solved by technology
The contact measurement method has the disadvantages of low precision, slow response, and the measurement system is easily corroded by liquid.
[0003] At present, the optical devices for measuring fluid flow velocity in China mainly use solid or gas lasers with narrow line width, which are expensive and bulky. On the other hand, convex lenses are used to collect forward scattered light, and the optical path is long, which is not conducive to the small size and low cost of the system. It is not conducive to the wide application of the system
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[0028] The laser 1 in this embodiment adopts a semiconductor laser, and requires a small beam diameter. Such as figure 2 As shown, the light-splitting surface of the equal optical path beam-splitting prism 2 is coated with a semi-transparent and semi-reflective film, and the distance between the two split beams is slightly smaller than the aperture of the converging lens 3 . The focal point of the converging lens is located at the central axis of the tube, such as figure 2 As shown, the focal length of the converging lens should be slightly greater than the radius of the circular tube, and the material of the circular tube should be made of plexiglass and other materials with good light transmission and relatively stable physical and chemical properties. The above-mentioned structure determines the value of the parameter θ of the Doppler frequency expression, and the distance between the two laser beams measured in the equal optical path beam splitter prism is d, and the fo...
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The invention discloses an optical device for determining the flow speed and flow of special fluid. The device is mainly composed of a laser device, an equal optical path beam splitter prism, a convergence convex lens, an organic glass tube, a spherical reflector and a photoelectric detector. A single-color laser emitted by the laser device is divided into two beams of parallel laser which are almost equal in energy through the equal optical path beam splitter prism, the two beams of parallel laser are focused in the center of a flow field of the organic glass tube through the convergence convex lens, scattered light from measurement point is emitted out from the other side of the organic glass tube, reflected by one sphere and again focused on the photosensitive face of the photoelectricdetector again, difference frequency of the scattered light is extracted from an electrical signal by the utilization of an optical heterodyne technology, and then the transient flow speed of the fluid in the flow field can be measured. Through further integration, the flow information of the fluid within a time period can be obtained. The optical device can measure the flow speed and the flow ofthe special fluid, and has the advantages of being high in precision, high in response speed and compact in structure.
Description
technical field [0001] The invention relates to an optical device, in particular to a method for measuring the flow rate of a special fluid and an optical device. Background technique [0002] With the improvement of modern industrial automation, accurate acquisition of system data has become the key to the normal operation of the system. Aircraft fuel oil measurement, chemical industry's measurement of corrosive liquid flow rate and flow rate, and even some gas flow rate measurement, etc. The contact measurement method has the disadvantages of low precision, slow response, and the measurement system is easily corroded by liquid. [0003] At present, the optical devices for measuring fluid flow velocity in China mainly use solid or gas lasers with narrow line width, which are expensive and bulky. On the other hand, convex lenses are used to collect forward scattered light, and the optical path is long, which is not conducive to the small size and low cost of the system. It...
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IPC IPC(8): G01F1/66G01P5/26
CPCG01F1/661G01P5/26
Inventor 陈文建李文李武森林天衣
Owner NANJING UNIV OF SCI & TECH