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Linear array CCD transmission type liquid level measuring method and device

A technology for liquid level measurement and measurement device, which is used in measurement devices, liquid/fluid solid measurement, lubrication indicating devices, etc., and can solve problems such as limited use range, high requirements for line light sources, and easy errors.

Inactive Publication Date: 2009-03-18
HARBIN ENG UNIV
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  • Application Information

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Problems solved by technology

The structure of this method is relatively simple, but since the glass tube itself is a lens, there needs to be a certain distance between the linear array CCD and the glass tube, which is prone to errors
In addition, the requirements for line light sources are relatively high, and the scope of use is limited

Method used

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  • Linear array CCD transmission type liquid level measuring method and device
  • Linear array CCD transmission type liquid level measuring method and device
  • Linear array CCD transmission type liquid level measuring method and device

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Embodiment Construction

[0020] Combined with Figure 1, the linear array CCD transmissive liquid level measuring device includes LED point light source 3, transparent protective cover 4, airtight box 7, linear array CCD6, circuit unit 8 (including: CCD drive, data acquisition and processing and data transmission functions ), the linear array CCD6 is embedded in a slot with the same width as the width of the CCD chip on one side of the airtight box 7 and the gap between the slot and the CCD6 is sealed on both sides inside and outside the airtight box 7, while ensuring that the protective glass of the CCD6 is slightly It protrudes from this side of the airtight casing 7 . Place the airtight box 7 in the container 12 containing the liquid 2 to be measured (or close to the side wall of the container), and make the linear CCD vertical to the horizontal plane, while the liquid level 1 is in the middle of the photosensitive area of ​​the linear CCD. At the time, due to the wetting effect, the liquid will pro...

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Abstract

The invention discloses a transmission-type liquid level measuring method based on a linear array CCD and a measuring device. The method adopts infiltration effect and other border effects of objects, forms a transmissive relation with the linear array CCD through a point light source, and obtains output values with different pixel strengths of CCD; and the values can directly reflect the characteristics of the liquid level, and if the data are subjected to further processing, high-precision liquid level measured values can be obtained. The method is an optical liquid level measuring method without an optical imaging lens, has the advantages of little influence on precision caused by temperature and concentration change of liquid, relatively simple structure, easy placement, capability of working in corrosive and other severe industrial environments and so on; and non-contact measurement can be realized if a receiving device is placed on the outside of a transparent container.

Description

(1) Technical field [0001] The invention relates to a liquid level measuring method and device, in particular to a linear array CCD-based transmissive liquid level measuring method and a measuring device. (2) Background technology [0002] Liquid level is one of the most important and commonly measured parameters in industrial processes. The measurement of liquid level mainly refers to the position measurement technology of vapor-liquid, liquid-liquid, liquid-solid interface, which is widely used in liquid storage equipment such as chemical industry, petroleum and power plant. The existing liquid level measurement methods include pressure liquid level measurement method, floating liquid level measurement method, capacitive liquid level measurement method and ultrasonic liquid level measurement method, etc., but when the liquid concentration, temperature changes or is restricted by the environment, the above measurement The resolution of the method is low, the error is large...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F23/292
Inventor 温强李玩幽姜富强黄宗军孙秋华赵言诚王伟强谭爽杨依珍邵永丰
Owner HARBIN ENG UNIV
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