Liquid level measuring method and device
A technology of liquid level measurement and liquid level position, which is applied in the direction of liquid level indicators for physical variable measurement, and can solve the problems of corrosion, restricting the progress of the automation field, and high cost of measuring devices
Inactive Publication Date: 2008-10-15
汤哲夫
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Problems solved by technology
In addition, if the material of the liquid level or material level or color to be measured is corrosive or explosive, the sensor device for the measurement process must also be anti-corrosion and explosion-proof
All these have led to high cost of the entire measuring device, and have also restricted the progress of many automation fields.
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[0014] The image sensor is fixed at a specific position so that it can obtain an image of a fixed area, in which the upper and lower parts are divided by the liquid surface, and the colors of the two parts are different. In this way, we can take two points A and B that can move up and down with a constant and very close distance in the vertical direction. If there is a difference in the pixel component (R, G, B) values of these two points, it means that the two points The points come from different areas, one must be from the air and the other from the water, and the dividing line is between these two points, so the position of the dividing line is determined.
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A measuring method for liquid level, which transmits images above and under the liquid level to computer through imaging sensor and create a virtual measuring frame by software in the computer. The actual height H#-[1] of the image in the measuring area is as K times of height of measuring frame, whose vertical coordinates range from upper edge to the bottom and set points A and B with a tiny vertical distance between them and determine liquid level through pixel components (K,G,B) of the object images locating above and under liquid level and measures vertical coordinate Y so as to measure liquid level To get N points and average them, the relative height of liquid level above basic measuring line is H#-[2]=H#-[1]-YxK actual liquid level is H=H#-[2]+H#-[0], the height of basic measuring line is H#-[0].
Description
Technical field: [0001] The invention belongs to the technical field of sensors and measurement, in particular to a method and device for measuring liquid level, material level and color. technical background: [0002] At present, there are quite a lot of automatic measurement applications of liquid level or material level or color in industry, agriculture, medical and health industries. There are many principles and methods, such as the use of floating ball displacement, resistance strain, pressure strain, capacitance and inductance parameter changes, magnetostriction, photoelectric colorimetry, etc. to reflect liquid level or material level and color changes, and to measure liquid level or material level and color changes. Measurement. Whether the above-mentioned principles and methods are contact or non-contact measurement, one thing in common is that there is an analog simulation amplification link in the whole measurement process when the non-electricity and electric q...
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IPC IPC(8): G01F23/22
Inventor 刘卡波黄昌林李玉林汤哲夫
Owner 汤哲夫