Photoelectric liquid level sensor and measuring method thereof

Abstract

The invention discloses a photoelectric liquid level sensor and a measuring method; the photoelectric liquid level sensor comprises a laser and a photoelectric receiver, wherein the laser is connected with the photoelectric receiver through an optical fiber, the optical fiber is arranged in the a protection pipe, and the bottom of the protection pipe is provided with a plurality of holes. Or, the laser is communicated with the photoelectric receiver through a glass rod, the bottom of the glass rod is provided with a triple prism or a reflection device, the photoelectric liquid level sensor provided in the invention is arranged in the liquid, and the internal light transmission conditions are destroyed through changing the boundary condition of light transmission medium to result in that the output light intensity is in direct proportion to the liquid level height in order to measure the liquid level height. The sensor immerges into the liquid, adopts the optical device and has no electronic device, and thereby has the strong anti-electromagnetic interference ability and the good corrosion resistance and is particularly applied to the measurement of flammable and explosive liquid. The invention has the advantages of the small volume, the simple structure, the low cost, the convenient installation, no electric quantity in the liquid, and the safe and convenient measurement.

Description

technical field [0001] The invention relates to a sensor and a measuring method thereof, in particular to a light intensity modulated photoelectric liquid level sensor and a method for detecting the position of a liquid surface by using the photoelectric liquid level sensor. Background technique [0002] In the prior art, the detection of the position of the liquid surface can be roughly divided into float type liquid level sensors, electric contact type liquid level sensors, and some use ultrasonic section liquid level sensors. For the float type liquid level sensor, due to the relative moving mechanical parts, it is prone to mechanical failure, and the installation and debugging are more complicated; for the electric contact type liquid level sensor, because it uses the conductive energy of the measured medium to detect liquid Therefore, it is only limited to liquid media with conductive properties, and has direct electrical contact with the measured medium, and is not sui...

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Problems solved by technology

For the float type liquid level sensor, due to the relative moving mechanical parts, it is prone to mechanical failure, and the installation and debugging are more complicated; for the electric contact type liquid level sensor, because it uses the conductive energy of the measured medium to detect liquid Therefore, it is only limited to liquid media with conductive properties, and has direct electrical contact with the measured medium, and is not suitable for liquid level measurement of flammable and explosive liquid media; for ultrasonic interface liquid level sensors, due to It uses the reflection of ultrasonic waves on the surface of the liquid medium to detect the liquid level, which is easily affected by external factors and has high requirements for the external environment.

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