RU2683878C1 - Light liquid level gauge - Google Patents

Abstract

FIELD: measurement.SUBSTANCE: invention relates to instrumentation, particularly, to measurement of liquid level in container. Light level gauge of liquid, comprising measuring tube and separation housing, on which is screwed cylinder with cover, separating liquid, located in container, from photodetector, light sources, optically coupled with receiving photocell, which outputs are connected to inputs of measurement device, wherein transparent measuring tube with installed in it photodetector, fixed in upper and lower flanges, is inserted into housing, inside of which floating piston-float with upper mirror surface freely moves, at that light sources are rigidly fixed in upper flange inside housing at equal distances from each other along circumference, and in lower flange there is ring-shaped cut-out for liquid access.EFFECT: technical result is higher accuracy of measurements and simple design of sensor.1 cl, 1 dwg

Description

Usage: the invention relates to a control and measuring technique, namely to measuring the liquid level in a tank.

A float fiber-optic level gauge is known from the prior art, comprising a vertically oriented cylindrical tube that communicates with a controlled reservoir, a float located in a vertical tube, two optical fibers and a recorder. The optical fibers are made in the form of fiber coils optically matched with an LED and a photodiode into an interferometer. The photodiode is connected by an output through an amplifier to the recorder. The first fiber spool is located at the bottom of the pipe, and the second is at the bottom of the float. (Patent RU No. 2212635 IPC G01F 23/22, publ. September 20, 2003 bull. No. 26).

The disadvantage of this technical solution is the low accuracy of the fuel measurement associated with liquid precipitation on the emitter. In addition, drops of liquid condensate flowing down from the fiber coupled to the photodetector, and from the ceiling of the tank, fall on the surface of the liquid, causing its perturbation. This reduces the accuracy of liquid level measurements.

Closest to the claimed technical solution is a level gauge for liquid, contains a radiator, a photodetector and a guide light guide tube. A float with an optical element for processing a light signal is placed in the tube. Optical fibers are placed in pairs along the light guide tube. The height of the optical element for processing the light signal is made greater than the step of vertical placement of the optical fibers. As an optical element for processing a light signal, a photoluminescent screen, an optical prism, or a mirror screen can be used.

(Patent RU No. 2183316 IPC G01F 23/00, G01F 23/68, published on June 10, 2002, Bull. No. 16).

The disadvantages of this technical solution are the discreteness in the measurement of liquid, the difficulty in manufacturing.

The objective of the invention is to increase the measurement accuracy and simplify the design of the sensor, the application for measuring the level of a liquid having precipitation.

The problem is solved by using as a receiver a photoresistor located in the center along the axis of the transparent cylinder and LEDs along the radius between the opaque case with a transparent cylinder inside this case. In addition, in the lower part of this gap is a float with a reflective surface and an annular cut-out for liquid access. The operation of the sensor is based on a change in the intensity of the light flux depending on the liquid level, which is perceived by the photoresistor through the walls of the transparent cylinder.

The invention is illustrated by drawings, which depict: in FIG. 1 is a general diagram of a device, a longitudinal section.

The light liquid level gauge comprises a housing 2 and a measuring tube 1 onto which a cylinder 6 with a cap 7 is screwed, separating the liquid in the tank from the photodetector 4, light sources 3, 5, optically coupled to the receiving photocell 4, the outputs of which are connected to the inputs measuring device, power supply 8, amplifier 9, transmitting device 10, characterized in that the transparent measuring tube 1 with a photodetector 4 installed in it, mounted in the upper and lower flanges and inserted into the housing 1, inside which is freely variable aetsya float floating piston 11 with the upper surface of the mirror, wherein the light sources 3, 5 are rigidly fixed in the upper flange inside the housing at equal distances from one another circumferentially, and in the lower flange has an annular recess for liquid access.

The device operates as follows. Light from light sources 3, 5. and reflected from the mirror surface of the piston-float 11 through a transparent measuring tube 1 enters the receiving photodetector 4, is amplified by the amplifier and transmitted by the transmitting device to the receiver (not shown in the diagram). The piston float 11 floats on the surface of the liquid, tracking its level. The luminous flux incident on the photodetector 4 depends on the surface area of the transparent measuring tube, i.e. the height of the float, which increases or decreases the cylinder of the transparent measuring tube 1.

The device provides high accuracy and technologically due to the simplicity of the design.

Claims (1)

A light liquid level gauge containing a measuring tube and a separation housing separating the liquid in the tank from the photodetector, light sources optically coupled to the receiving photocell, the outputs of which are connected to the inputs of the measuring device, characterized in that the transparent measuring tube with a photodetector installed in it fixed in the upper and lower flanges is inserted into the housing, inside of which the floating piston-float freely moves with the upper mirror surface, and the sources the lights are rigidly fixed in the upper flange inside the housing at equal distances from each other around the circumference, and in the lower flange there is an annular cut-out for fluid access.

Images