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Optical total-reflection type linear array CCD liquid level measuring method and device

A total reflection and liquid level measurement technology, which is applied in the direction of measuring devices, liquid/fluid solid measurement, lubrication indicating devices, etc., can solve the problems of limited application range, high requirements for line light sources, and prone to errors

Inactive Publication Date: 2009-08-19
如皋市生产力促进中心
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  • Summary
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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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  • Optical total-reflection type linear array CCD liquid level measuring method and device
  • Optical total-reflection type linear array CCD liquid level measuring method and device
  • Optical total-reflection type linear array CCD liquid level measuring method and device

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Embodiment Construction

[0021] combine figure 1 The optical total reflection linear array CCD liquid level measuring device includes LED point light source 3 and transparent protective cover 4, airtight box 7, linear array CCD 6, 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 CCD chip on one side of the airtight box 7, and the gap between the slot and the CCD6 is sealed on the inner and outer sides of the airtight box 7, while ensuring that the protective glass of the CCD6 is slightly convex Out of this side of airtight casing 7. Airtight casing 7 is placed in the container 5 that fills to-be-measured liquid 2 (or is close to the side wall of container), and linear array CCD is vertical with horizontal plane, and liquid level 1 is in the middle part of linear array CCD photosensitive area simultaneously; To achieve total reflection optical measurement, put the LED point ligh...

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Abstract

The invention discloses an optical total reflection type linear array CCD liquid level measurement method and a measurement device. The method uses the total reflection principle of optics and liquid midpoint light can form a reflection blind area in a certain area above the liquid surface, causing the light intensity below the liquid surface to rather more than the blind area, while the liquid surface is exactly the lower bound of the blind area. The position of the bound can be measured out by using the linear array CCD. If the output data of the linear array CCD is further processed, a high-precision liquid level measurement value can be obtained. The method is an optical liquid level measurement method needing no optical imaging lenses, and has the advantages of extremely little effect on the precision by the temperature change and concentration change of liquid, relatively simple structure, easiness for arrangement, the capability of working under corrosiveness and other vile industrial environments, etc. If a receiving device is arranged outside a transparent container, non-contact measurement can be realized.

Description

(1) Technical field [0001] The invention relates to a liquid level measuring method and device, in particular to an optical total reflection linear array CCD 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 i...

Claims

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Application Information

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IPC IPC(8): G01F23/292
Inventor 温强孙晶华朱正邵永丰王伟强杨依珍谭爽
Owner 如皋市生产力促进中心
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