Single-channel contactless meter of oil layer thickness

FIELD: measuring engineering.

SUBSTANCE: meter determines dielectric permittivity and thickness of the oil layer by measuring at two angles unequal to the Brewster angle.

EFFECT: simplified design and expanded functional capabilities.

3 dwg

 

The invention relates to measuring technique and can be used to create portable (wearable) contactless measuring the thickness of a layer of oil spilled on the water surface, with the elimination of the ambiguity of the measurement.

At the present time to determine the thickness of the oil layer on the water surface is used way contact measurement using acoustic measures. In particular, the known acoustic probe to determine the location of the boundary liquid layer [1]. However, this method and devices for its implementation have several disadvantages:

- use active radar measurement method;

the measurement is performed by the contact method;

- limited ability to measure thin layers of oil.

Authors unknown contactless single-channel datalogger thickness of the layer of oil spilled on the water surface, with the elimination of ambiguity in measurements.

The objective of the invention is to provide a device that allows to solve the problem.

This technical result is achieved by the fact that single contactless measuring the thickness of a layer of oil spilled on the water surface, eliminating the ambiguity of the measurement, contains a horn antenna is rigidly connected with the waveguide entrance radiometric receiver, the first inclinometer (date the IR roll), according to the indications of which are set to zero roll angle of the probe relative to the horizon, the second inclinometer (angle sensor space) to install the meter on the sensor readings alternately under predetermined angle measurement relative to the Zenith and the normal to the surface of the layer of oil, and it ϕbthat is equal to the Brewster angle, which is determined dielectric constant εnmeasured layer of oil, as well as ϕ1and ϕ2not equal to the Brewster angle, and ϕ1&λτ;ϕ2, calculator to determine the real part of the dielectric constant of the layer of oil εnthe thickness of the layer of oil with the elimination of ambiguity on the basis of measured parameters at two different angles ϕ1and ϕ2and determine if the measurement is outside the range of measurement of the thickness of the layer of oil, a display for displaying measured values of dielectric permittivity εnand the thickness of the layer of oil. The operation of the meter by typing commands at the keyboard. In this case, all the functional components of the meter are placed on a common structural base and United in one common housing.

Figure 1 shows the block diagram of the meter, consisting of a horn antenna 1, radiometric receiver 2, incline is the EPR 3 for setting the zero position of the meter in relation to the horizon, transmitter 4, inclinometer 5 for installation angles of measurement, and the outputs of the inclinometer is connected to the computer, which displays data about the corners ϕ1and ϕ2on the display, the display 6, a keyboard 7.

The basis of operation of the meter based on the known methods of measurement of various parameters of the oil film under natural conditions[2], [3], [4].

The meter operates as follows.

Before measuring the thickness of the layer of oil is determined in real-time the real part of the dielectric constant of oil spilled εn[2] (figure 2).

To do this, send the meter at the Brewster angle relative to the direction to the Zenith and receive vertically polarized [5] component of the electric field of noise unpolarized radiation of the sky.

The value of the Brewster angle is calculated by the formula

where εnone of the pre-defined from within the 1,8-3,0 possible values of the real part of the dielectric constant of the layer of oil. According to the amplitude of the vertical electric field polarization of the sky E0that is when measuring the reference value of the radiation is calculated in the calculator according to the Fresnel equations, the amplitude of E5penetrating electric field vertical polars the organization from the bottom layer of oil on the border with the water surface taking into account the dielectric constant of the air ε 0and the real part of the dielectric constant of water εinaccording to the formula:

where

Then the probe is directed at the same angle Brewster ϕbmounted relative to the normal to the surface of the layer of oil in the direction of the oil layer, and measure the amplitude of EIzmirpenetrating vertical electric field polarization of the lower layer of oil on the border with the water surface, the evaluator compares the measured value of the amplitude of EIzmirthe electric field vertical polarization with the calculated its value ERaschand, if the difference between the measured and calculated values exceeds the specified level of accuracy, on the display of the meter displayed value εnnot defined”. The measurements are repeated by changing the originally selected value εnc 0.1 V step through the preset limits and achieve the coincidence of the calculated and measured values with a given accuracy.

ERasch=EIzmir.

The display on the meter displayed value εndefined, and optionally the user may be caused by using the keypad on the display screen is certain that the way they ε n.

The resulting value εnused in the following procedure to determine the thickness of the layer of oil.

Then carry out the measurement of the thickness of the layer of oil according to [4], under two corners ϕ1and ϕ2not equal to the Brewster angle, and ϕ1&λτ;ϕ2(figure 3).

Measurements are performed alternately at angles ϕ1and ϕ2measured from the direction to the Zenith, which originally set the meter, and measure vertically polarized components of the electric field in noise unpolarized radiation of the sky Ei0where i=1, 2 correspond to the corners ϕ1and ϕ2.

For the adopted values of the electric field on both corners of the measurement transmitter is calculated as the Fresnel amplitude of the electric field of the vertical polarization of the specularly reflected from the border environment air film of oil” Ei1and reflected from the lower layer film of oil on the border with the water surface and refracted at the boundary film of oil - air” Ei5when the known refractive indices of the media - air, water, and the real part of the dielectric constant of the layer of oil that is written expressions [3], [4]

- specular component of the electric field,

img src="https://img.russianpatents.com/814/8146251-s.jpg" height="14" width="82" > - refracted component of the electric field that passes the boundary layer of oil - air”

- refracted component of the electric field at the boundary air layer of oil”

- the angle of refraction at the boundary between media air - layer oil”

- the angle of refraction at the boundary between media layer of oil - water”.

Next, the probe is directed alternately at angles ϕ1and ϕ2mounted relative to the normal to the surface of the layer of oil in the direction of the oil layer, and measured alternately at every angle sum of coherent waves U

2
ISM
mirror Ei1and accordingly penetrates Ei5components of vertical polarization, taking into account the phase difference caused by the difference in behavior of these components to the input of the meter is proportional to twice the thickness of a layer of oil (petroleum).

- measured amounts of coherent waves at respective angles measuring ϕ1and ϕ2,

wherethe phase shift at each angle measurement.

the phase shift in radians on each the Le measurements,

wherewave number for each angle measurement in the structure of environments,

- the thickness of a layer of oil on each angle measurement.

When the phase shift between the mirror and pretraining components Δ ϕ ≤ π at every angle measurement the equality d1=d2specifying an unambiguous value of the measured thickness of the layer of oil with the given tolerance, for example, not worse ± 3,0%.

If the phase shift Δ ϕ &γτ; π receive an ambiguity in determining the thickness of the layer of oil [4].

The criterion for the transition to the ambiguity of the definition of the thickness of the layer of oil is the differences of the measured values of the film thickness on the corners ϕ1and ϕ2, that is, d1d2.

Measurements at two angles ϕ1and ϕ2not equal to the Brewster angle, eliminates the ambiguity of measurements and thereby to extend the range of measurement of the thickness of the layer of oil, and when the measurement is taken inequality ϕ1&λτ;ϕ2. When measuring, if the evaluator determined that the d2&γτ;d1then the actual value of the thickness of the layer of oil is determined for each angle after the refinement phase shift between the mirror component of the E1and refracted the th component of E 5as follows:

and the thickness of the layer of oil:

this should be done with the given tolerance equal thickness at the corners ϕ1and ϕ2

d′FAQ=d′FAQ.

If the evaluator determined that the d1&γτ;d2then the actual value of the thickness of the layer of oil is determined after refinement of the phase shift between the mirror component of the E1and refracted component of E5as follows:

and the thickness of the layer of oil:

thus the equality of the thickness of the layer of oil with a specified tolerance ϕ1and ϕ2

d″FAQ=d″FAQ,

where K is the wave number for each angle measurement in the structure of environments,

Δ ϕ ′fuck.and Δ ϕ ″fuck.- corrected phase shift for each angle measurement [4].

The measured value of the thickness of the layer of oil appears on the display.

If for the case when d1&γτ;d2when calculating according to the relevant formula does not match the obtained values of d″FAK.and d″FAK.it defines the limit of the range of the measured thickness in the frequency range and is used radiometric probe. In this case, on the display appears “beyond measure”.

Implementation of the invention can be implemented on commercially available products:

- horn antenna - model product used wavelength range,

- radiometric receiver can be built according to the scheme modulation single-channel receiver [6], for example on the basis of commercially available CJSC “NPP “Salut-27” (Nizhny Novgorod) radiometric receivers

- as a calculator can be used by the microcontroller Octagon 6040 by Octagon Systems with matched him with display and keyboard

as angle sensors can be used inclinometers type DK-1, produced by LLC “microprocessor technology” (Moscow).

Literature

1. RF patent №2159412 on the invention of the Acoustic probe to determine the location of the boundary liquid layer.

2. RF patent №2202779 for the invention of “Passive remote method of determining the real part of dielectric constant film of oil spilled on the water surface”.

3. RF patent №2207500 for the invention of “Passive remote method of determining the film thickness of the oil spilled on the water surface”.

4. RF patent №2207502 for the invention “Method of disambiguation when measuring the film thickness of the oil is of tucta, spilled on the water surface”.

5. Kaliteevsky NI Wave optics. High school, M, 1978

6. Sakina N.A., goldcrests D.V., Parisky YU. Radio telescopes and radiometers. Edited Korolkova A.I Izd-vo Nauka, Main editorial Board for Physical and mathematical literature, Moscow, 1973

Single contactless measuring the thickness of a layer of oil spilled on the water surface, eliminating the ambiguity of measurements containing horn antenna is rigidly connected with the waveguide entrance radiometric receiver, measuring the amplitude of the electric field vertical polarization radiation of the sky, the first inclinometer (tilt sensor), according to the indications of which are set to zero roll angle of the probe relative to the horizon, the second inclinometer (angle sensor space) to install the meter on the sensor readings alternately under predetermined angle measurement relative to the Zenith and the normal to the surface of the layer of oil, namely, ϕbthat is equal to the Brewster angle, which is determined dielectric constant εnmeasured layer of oil, as well as ϕ1and ϕ2,not equal to the Brewster angle, and ϕ12the transmitter with the mating him with display and keyboard connected to the outputs of the inclinometers used to determine, adopted by the th amplitude of the vertical electric field polarization of the sky, the real part of the dielectric constant of the layer of oil εnthe thickness of the layer to remove the ambiguity on the basis of measured parameters at two different angles ϕ1and ϕ2and the definition beyond the measurement range of the thickness of the layer of oil, a display for displaying measurement results, the keyboard commands that control the operation of the meter, all the functional components of the meter are placed on a common structural base and United in one common housing.



 

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