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System and method for measuring droplet evaporation rate

A droplet evaporation and evaporation rate technology, applied in the field of droplet evaporation rate measurement system, can solve the problem that the droplet evaporation rate cannot be obtained

Inactive Publication Date: 2010-11-17
NAT SPACE SCI CENT CAS
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Problems solved by technology

[0008] However, this method can only measure the evaporation rate at a certain point, and cannot obtain the evaporation rate of the entire droplet

Method used

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  • System and method for measuring droplet evaporation rate
  • System and method for measuring droplet evaporation rate
  • System and method for measuring droplet evaporation rate

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Embodiment Construction

[0049] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0050] Such as Figure 4 As shown, after the image acquisition module obtains the image of the droplet, it is processed by the image processing module. Firstly, the Sobel operator is used to detect the edge of the grayscale image, and the areas with drastic changes in grayscale are obtained. These areas include the real outline of the droplet, noise interference, and internal false outlines caused by the reflection of the droplet; The statistical histogram reasonably selects the domain value to remove noise interference; through the processing of the connected region marking algorithm of the binary image, each connected region in the image can be distinguished by marking it with a different label, and the region with the largest area in the region is selected. The internal false contours and noises caused by reflection are filtered out, whic...

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Abstract

The invention relates to a system and a method for measuring droplet evaporation rate. The system comprises an image acquisition module, an image processing module and an evaporation rate computation module, wherein the image acquisition module comprises a CCD camera and an image acquisition card, the CCD camera is used for monitoring and shooting droplets and transmitting captured PAL analog video streams to an image acquisition card, and the image acquisition card is used for decoding and synchronously separating the PAL analog video streams and then transmitting digital droplet image signals to the image processing module; the image processing module is used for analyzing the digital droplet image signals of single-frame images captured at a time interval of delta t to obtain the contour line of droplet images at the moment of t and transmit the contour line to the evaporation rate computation module; and the evaporation rate computation module utilizes an intervalometer to compute the evaporate rate of the droplets in unit area and unit time. The invention combines the characteristics of image processing and simultaneously utilizes the strong data-handling capacity of a DSP, thus being capable of giving the evaporate rate of the droplets at a certain moment in real time.

Description

technical field [0001] The invention relates to the measurement of the evaporation rate of liquid droplets, in particular to a measurement system and method for the evaporation rate of liquid droplets. Background technique [0002] Available measurement methods are: [0003] 1. Image method for calculating droplet diameter [0004] The image of the droplet is approximated as a circle, the diameter of the circle is obtained, and the mass of the droplet is obtained from the diameter and the specific gravity of the droplet. Calculate the droplet evaporation rate according to the quality difference and time interval of the two images. [0005] However, the measurement result of this method has a large deviation, because the shape of the droplet deviates greatly from the ideal circle, so the measurement result has a large deviation from the actual evaporation rate, and a large amount of image processing work is required, and the droplet volume cannot be adjusted. real-time con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P3/38
Inventor 于强蔡世界
Owner NAT SPACE SCI CENT CAS
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