UA12705U - Device for determining the boundary layer between two different media - Google Patents

Abstract

The proposed device for determining the boundary layer between two different media contains a submersible waveguide and a unit for transmitting and receiving electromagnetic radiation. At the input of the waveguide, a horn with the conducting inside surface shaped as a cone is installed.

Description

Description of the invention

A useful model relates to the technique of measuring non-electric quantities and can be used to determine the levels and boundaries of separation of heterogeneous immiscible liquid and bulk media.

A well-known device for determining the levels and boundaries of separation of heterogeneous (liquid and loose) media, which includes a waveguide intended for immersion in a controlled environment, connected to a device for excitation and reception of an electromagnetic signal (Ukrainian patent for an invention Mo31791, (301E23/28, 30.10 .1998.

However, to determine the separation boundary of some media whose dielectric constant values differ slightly, it is necessary to use more powerful signals, since the level of the signal reflected from the separation boundary of such media is low.

The technical task of the useful model is to improve the device for determining the levels and boundaries of the separation of heterogeneous liquid and loose media, which has a waveguide designed for immersion in a controlled environment, connected to a device for excitation and reception of an electromagnetic signal, by using a horn emitter - installing a horn in the form a truncated cone, directed to the end of the waveguide, at the beginning of the waveguide, which provides an increase in the level of sent and reflected signals, contributing to the increase in the sensitivity of the device and the accuracy of measurements. Making the waveguide single-conductor provides significantly less dependence on changes in the environment parameters, which contributes to the increase in the reliability of the device for determining the separation boundaries of heterogeneous media, especially loose media.

The device for determining the boundaries of the separation of heterogeneous media has a waveguide connected to the device for excitation and reception of an electromagnetic signal intended for immersion in a controlled environment, at the beginning of which a horn in the form of a truncated cone with a conductive inner surface is installed directed to the end of the waveguide; a truncated cone can have a smaller diameter from 34 to 50 mm, a larger diameter from 80 to 120 mm, a length from 80 to 150 mm; the horn can be made of polymer material with a 22 metallized inner surface; the waveguide can be single-wire. -at

Figure 1 shows a block diagram of a device for determining the boundaries of separation of heterogeneous media. Fig. 2 shows the relationship in time, revealing the operation of the device.

The device for determining the boundaries of the separation of heterogeneous media contains a device 1 for excitation and reception of an electromagnetic signal, which is connected immersed in two immiscible heterogeneous media | and II, located at 30 in the tank, a single-conductor waveguide - a sensitive element 2, at the beginning of which is installed Ha") directed to the end of a single-conductor waveguide of a sensitive element 2 horn C in the form of a truncated cone with a current-conducting inner surface. -

The device 1 for excitation and reception of an electromagnetic signal can be made, for example, according to the Ga patent of Ukraine for the invention Mo31791, and contain a stable voltage generator (GSN) 4, the output of which is connected to the 39 input of the receiver (Pr) 5, and the output of the receiver 5 is connected in series to a stroboscopic converter -- (SP) 6, an analog-to-digital converter (ADC) 7 and a calculator (06) 8. The device also contains a wave impedance inhomogeneity (NHO) 9 included between a stable voltage generator 4 and a sensitive element 2, and the coordinate displacement device of the exemplary measure (PZKZM) 10, the output of which is connected to the input of the stable voltage generator 4, and the input is connected to the calculator 8. As a generator of stable voltage 4, a generator that produces one of three types of signals can be used : video signal, voltage drop or superimposition (superposition) of the video signal on the voltage drop signal. c" As a single-conductor waveguide of the sensitive element 2, you can use, for example, an empty steel cable (for the separation limits of bulk substances) or a flexible water-conducting metal-plastic pipe (for determining the levels and separation limits of liquid media), which have sufficient flexibility and, accordingly, higher strength for breaking, and 45 are also the most convenient for transportation; temperature and other sensors can be located inside the cavities of the lines. Horn C can be made of polymer material with a metallized inner surface. Since the device uses broadband signals in the form of rectangular nanosecond pulses, there are no restrictions on the size of the horn emitter, and in practice, the size of the conical horn is chosen based on the design dimensions of other devices: smaller diameter from 34 to av! 20 B5Ω, larger diameter from 80 to 120mm, length from 80 to 150mm

The device for determining the boundaries of separation of heterogeneous media works as follows. In the mode of preliminary measurement of signal delays using a stable voltage generator 1, an electromagnetic signal is produced, which is fed to the input of the single-wire waveguide of the sensitive element 3; the interaction of the single-conductor waveguide of the sensitive element 2 and the horn Z forms a surface wave that propagates along the single-conductor waveguide of the sensitive element 2, which emits a signal into the controlled environment c and receives the reflected signals. The reflected signals from the sensitive element 2 enter the input of the receiver 5. The appearance of inhomogeneity along the sensitive element 2 (the boundary of separation of media), which is the gradient of dielectric permeability, causes the appearance of reflected signals. The signal M sent to the sensitive element 2 is reflected from the inhomogeneity of the wave resistance (To is the delay of the signal reflected from the inhomogeneity of the wave resistance 9, because it is relative to the sent one), from the medium level | (TT 4 - delay of the signal reflected from the level, relative to the sent one), from the boundary of separation of media I and II (To - delay of the signal reflected from the boundary of separation of media, relative to the sent one) The signal from the output of the receiver 5 enters the stroboscopic converter 6, necessary for coordination of the propagation time of the surface electromagnetic wave along the waveguide of the sensitive element 2 and the operation of the analog-to-digital converter 7 and the computer 8. From the output of the stoboscopic converter b, the signal is sent to the analog-to-digital converter 7 and then to the input of the computer 8, in which, according to a specialized algorithm |see . patent of Ukraine for the invention Mo31791)| it is processed, obtaining the characteristics of the level and boundaries of separation of heterogeneous environments. The distance corresponding to the delay of one signal relative to another is determined by the formula:

И -М.у2, where М is the propagation speed of the electromagnetic wave along the waveguide of the sensitive element 2, m/s, and и is the delay of one signal relative to another, s. Thus, knowing the signal delays, it is possible to determine the levels and limits of separation of various media, both liquid and solid.

Equipping the waveguide of the sensitive element with a horn does not require modification of the electrical circuit of the device, so the 7/0 Resistor emitter can be used with any for excitation and reception of a surface electromagnetic wave, ensuring an increase in the level of the reflected signal from the boundary of separation of media by 3-4 times, which contributes to the increase device sensitivity and measurement accuracy. Due to the single-conductor line of the waveguide of the sensitive element, the reliability of the device for determining the separation boundaries of heterogeneous media, especially loose media, increases.

Claims (4)

The formula of the invention 1. A device for determining the boundaries of the separation of heterogeneous media, which contains a waveguide intended for immersion in a 2o controlled environment, connected to a device for excitation and reception of an electromagnetic signal, which is characterized by the fact that at the beginning of the waveguide, a horn in the form of a truncated cone directed to the end of the waveguide is installed conductive inner surface. 2. The device according to claim 1, characterized in that the truncated cone has a smaller diameter of 34 to 50 mm, a larger diameter of 80 to 120 mm, a length of 80 to 150 mm. C. The device according to claim 1 or claim 2, which differs in that the horn is made of polymer material with a metallized inner surface. t 4. The device according to claim 1 or claim 2 or claim 3, which differs in that the waveguide is single-wire. IF) "c) in the village - and? - ime) -i («c) sl 60 b5