RU2628867C1 - Intelligent system for remote control of working body position inside closed space - Google Patents

Intelligent system for remote control of working body position inside closed space Download PDF

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Publication number
RU2628867C1
RU2628867C1 RU2016134678A RU2016134678A RU2628867C1 RU 2628867 C1 RU2628867 C1 RU 2628867C1 RU 2016134678 A RU2016134678 A RU 2016134678A RU 2016134678 A RU2016134678 A RU 2016134678A RU 2628867 C1 RU2628867 C1 RU 2628867C1
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RU
Russia
Prior art keywords
optical
output
input
unit
working body
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RU2016134678A
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Russian (ru)
Inventor
Вадим Александрович Первунинских
Валерий Георгиевич Шапаев
Владимир Эристович Иванов
Александр Алексеевич Ефаров
Original Assignee
Федеральное государственное унитарное предприятие федеральный научно-производственный центр "Производственное объединение "Старт" им. М.В. Проценко" ("ФГУП ФНПЦ ПО "Старт" им. М.В. Проценко")
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Application filed by Федеральное государственное унитарное предприятие федеральный научно-производственный центр "Производственное объединение "Старт" им. М.В. Проценко" ("ФГУП ФНПЦ ПО "Старт" им. М.В. Проценко") filed Critical Федеральное государственное унитарное предприятие федеральный научно-производственный центр "Производственное объединение "Старт" им. М.В. Проценко" ("ФГУП ФНПЦ ПО "Старт" им. М.В. Проценко")
Priority to RU2016134678A priority Critical patent/RU2628867C1/en
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00Indicating or measuring liquid level, or level of fluent solid material, e.g. indicating in terms of volume, indicating by means of an alarm
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
    • G01N15/06Investigating concentration of particle suspensions

Abstract

FIELD: measuring equipment.
SUBSTANCE: system comprises a closed-space housing arranged in an aggressive medium, with an optical unit mounted thereon, and an electronic unit for controlling and processing information, associated with the optical unit by means of an optical fiber passing through the division of the aggressive and the safe mediums and made with the possibility to provide explosion protection. Inside the closed-space housing, a working body with a retro-reflector fixed thereon is arranged. The structure of the electronic unit for information management and processing includes: a processor, an optical transmitter, an optical receiver, an analog-to-digital converter and an optical circulator. Between the collimator of the optical unit and the retro-reflector, a collimated luminous flux is formed, consisting of rays incident and reflected from the retro-reflector, which provides the process of measuring and controlling the working body position inside the closed space.
EFFECT: providing non-contact remote measurement and control of the working body position inside the closed space.
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Description

The invention relates to instrumentation and can be used for non-contact remote measurement and control of the position of the working body in a confined space (for example, inside the reactor).

Well-known optical devices for non-contact control of the presence and measurement of the level of solids and liquids in confined spaces.

Such systems include, for example, the fiber optic sensor system for liquids “Fiber optic liquid sensing system” described in US patent No. 5684296, IPC G01H 15/06, publ. 1997 and containing an optical sensor, a control module and a fiber optic cable connecting the optical sensor with a control module. The optical sensor contains a light reflector. The housing of the optical sensor has openings for the passage of fluid into the sensor. The fiber optic cable comprises a transmitting optical fiber and a receiving optical fiber. The control module includes: a light emitter, a photosensor, a comparator, dry and wet indicators, and an on / off controller. The operation of the system is based on the radiation from the light control module and the reception of light reflected from the light reflector. If there is liquid inside the optical sensor, the light signal is weakened and the presence of liquid is detected by a wet indicator. The absence of liquid does not cause a weakening of the light signal and this condition is recorded by a dry indicator.

Similar essential features of the claimed and the aforementioned system are: a control module comprising a light emitter and a photosensor, a fiber optic cable, an optical sensor and a light reflector.

The disadvantage of the system is the inability to control the position of the working body inside a confined space. The system is not designed to measure the distance when a light beam passes from the emitter to the light reflector.

Known "Indicator of the surface level of the liquid in the vessel based on a comparison of the incident and reflected rays" (Liquid level gauge comparing moldulations of incident and reflected loser beams), described in US patent No. 5194747, IPC G01N 15/06, publ. in 1993. This device consists of an optical unit, a control unit and transmission means, which use coaxial and fiber optic cables. The optical unit contains collimating optics of the transmitter, focusing optics of the receiver and a photodiode. The control unit comprises a modulator, a phase detector, a processing circuit, a level display, and a laser emitting diode. The operation of the device is based on the emission of a modulated light signal by a laser diode and the reception of a light signal from a reflective liquid boundary in a vessel. The light signal is transmitted using a fiber optic cable to the optical element, where it is routed through the collimating optics of the transmitter to the liquid boundary. The reflected light signal through the focusing optics is fed to a photodiode, the output of which is connected via a coaxial cable to a control unit, which includes a phase detector designed to compare the phases of the modulation signals and determine the liquid level in the vessel.

Similar significant features of this and the claimed device are: optical unit, control unit, fiber optic cable, collimating optics of the transmitter.

The disadvantage of this device is the presence of a coaxial communication cable between the optical unit and the control unit, which does not provide explosion safety. Coaxial communication cable in comparison with fiber optic cable has less noise immunity from electromagnetic interference, which reduces the noise immunity of the device when the control unit is located from the optical unit at a considerable distance from each other. In addition, the use of two transmission media (coaxial and fiber-optic cables) for remote monitoring is not economically feasible because of the fundamental possibility of using only one fiber-optic cable.

Closest to the technical nature of the claimed invention is the “Method and apparatus for optical sensing of the agitated fluid surface” (Method and apparatus for optical level sensing of agitated fluid surfaces) described in US patent No. 7635854, IPC G01N 15/06, G01F 23 / 00 publ. 2009. The device described in the patent contains a tank with an optical unit mounted on it, light transmission means (two optical fibers), an electronic unit that is a certain distance from the optical unit, a user interface and an on-screen monitor. The optical unit contains a radiation channel with a lens for collimating light, a receiving channel with a focusing lens and an optical filter, and a protective optical window. The electronic unit contains a control and information processing module, an optical emitter module, an optical reception module, an analog-to-digital converter (ADC), and a communication interface output.

Common essential features with the claimed solution are: a reservoir (enclosed space enclosure), an optical unit, an optical fiber, an electronic unit (for controlling and processing information), a lens for light collimation (a collimator), an optical window, an information management and processing module (processor) , an optical emitter module (optical transmitter), an optical reception module (optical receiver), (ADC) and a communication interface output (interface line).

The disadvantage of this device is the inability to control the position of the solid-state working body. Another disadvantage of the device is the use of two fiber-optic cables for remote control of the liquid level, which is not economically feasible due to the fundamental possibility of using only one fiber-optic cable.

The aim of the present invention is the provision of remote control of the position of the working body, made in the form of a solid-state structure and located inside a confined space, with the possibility of using one optical fiber.

To achieve this goal, a new technical solution introduced new significant features, functional elements and relationships.

This goal was achieved in the proposed intelligent system for remote control of the position of the working body inside a confined space, which contains a closed space enclosure located in an aggressive environment, with an optical unit installed on it containing a collimator and an optical window, an electronic unit for managing and processing information, territorially remote from the enclosed space enclosure, which includes a processor, an optical transmitter, an optical receiver, and an analog-to-digital conversion a device (ADC), with the first output of the processor connected to the optical transmitter, the second output of the processor being the output of an electronic unit for controlling and processing information made in the form of an interface line for communication with external devices, the output of the optical receiver is connected to the input of the ADC, the output of which is connected to the input of the processor, inside the enclosed space housing there is a working body with a retroreflector fixed on it, between the first input / output of the collimator of the optical unit and the retroreflector the collimated light flux passing through the optical window of the optical unit and consisting of light rays incident and reflected from the retro-reflector, the second input / output of the collimator is the input / output of the optical unit, an optical circulator is introduced into the electronic unit for information management and processing, the input of which connected to the output of the optical transmitter, and the output connected to the input of the optical receiver, the input / output of the optical circulator is the input / output of an electronic unit for controlling and processing information ation, the input / output optical block connected to the input / output of the electronic unit for control and information processing by optical fibers extending through section corrosive and safe environments and configured to provide explosion protection.

The invention is illustrated in FIG. 1-2, which depict the following.

In FIG. 1 is a structural diagram of the proposed system, where the notation is introduced: enclosed space enclosure - 1, optical unit - 2, working body - 3, retro-reflector - 4, electronic unit for controlling and processing information - 5, optical fiber - 6, interface line - 7 , the collimated luminous flux is 8. In FIG. 1 shows the minimum L and maximum D levels of the position of the working body 3 inside the enclosed space 1.

In FIG. 2 shows a functional diagram of the proposed system, where in addition to FIG. 1 designations are introduced: an optical window - 9, a collimator - 10, a processor - 11, an optical transmitter - 12, an optical receiver - 13, an optical circulator - 14, an ADC - 15. In FIG. 2 shows (for example) one of the levels (L) of the position of the working body 3.

The proposed system (Fig. 1-2) works as follows.

The system consists of three parts - a closed space enclosure 1 with an optical unit 2 installed on it, an electronic unit for controlling and processing information 5 with an interface line 7, and a communication medium using optical fiber 6. There can be various types of enclosed space enclosures structures, for example, a tank, a tank, a storage tank for fuels and lubricants, a reactor, an electric melting furnace, and the like. A working body 3 is located inside the enclosed space 1 body, which can change its position in space from a minimum L to a maximum D. As a working body 3, there can be a solid object: electrode, graphite rod, shutter, lattice, bracket, etc. The enclosure of the enclosed space 1 is in an aggressive environment characterized by dangerous conditions for humans. It can be extreme temperatures (negative and positive), poisonous airborne droplets, high or low pressure, the presence of hazardous chemical or biological substances, radioactive radiation, strong electromagnetic field, explosive atmosphere, etc. The aggressive environment and the environment that is safe for humans are separated from each other by the medium section, the boundary of which is shown in FIG. 1. An electronic unit for managing and processing information 5 with an interface line 7 are in a safe environment for humans. The connection of the electronic unit for controlling and processing information 5 with the enclosed space 1 is carried out by means of an optical fiber 6, resistant to the properties of an aggressive environment. Optical fiber 6 can be presented in the form of a fiber optic cable with a sheath protected from the aggressive environment (not shown in Fig. 1-2). The position of the working body 3 inside the enclosed space is controlled using a collimated light flux 8, which is created between the collimator 10 of the optical unit 2 and the retroreflector 4 mounted on the working body 3. As a retroreflector 4, for example, a set of optical corner reflectors can be used. The collimated light flux 8 emitted by the collimator 10 passes through the optical window 9 of the optical unit 2, falls on the retroreflector 4 and is reflected from it in the opposite direction. The collimator 10 is connected to the optical fiber 6, through which a modulated light stream is sent from the electronic unit 5. The reflected light stream containing information about the position of the working body 3 is transmitted back to the optical unit 6 through the optical fiber 6 and the electronic unit for controlling and information processing 5 (see Fig. 2) contains a processor 11, an optical transmitter 12, an optical receiver 13, an optical circulator 14 and an ADC 15. An optical transmitter 12 under the control of the processor 11 provides the formation and the study of modulated light flux, which, passing through the optical circulator 14, is sent to the optical fiber 6. The reflected light flux from the optical fiber 6 through the optical circulator 14 enters the optical receiver 13, and then through the ADC 15 to the processor 11. The optical circulator 14 is intended for separation of the light fluxes on one side (inside the electronic unit 5) and combining the light fluxes in the optical fiber 6. The ADC 15 converts the analog signal from the output of the optical receiver 13 into a digital signal, th input to the processor 11. In order to monitor the position of working body inside the closed space in the proposed system uses a phase measuring method based on measuring the phase delay of the emitted and reflected signals. The processor 11 is configured to provide the following functions:

- modulation of the emitted signal;

- measurement of the phase delay of the emitted and reflected signals;

- calculation of the level of the position of the working body (from L to D);

- metrological calibration;

- diagnostic control (self-monitoring) of the system;

- communication with external devices through an interface line;

- receiving information from a weather station or from sensors of physical quantities (if necessary);

- obtaining control information and transmitting measurement data;

- adjustment of information processing algorithms in connection with changes in environmental conditions;

- adjustment of information processing algorithms depending on the position of the working body (elimination of non-linearity in measurements);

- adjustment of information processing algorithms associated with the life of the system (aging and deterioration of mechanisms);

- alarm about critical positions of the working body.

The intelligence of the system is ensured by the independence of decision-making in the performance of the above functions, since the access of managing personnel inside a confined space is impossible or significantly limited. To ensure the intelligence of the system, the processor 11 is configured to implement functioning algorithms in the form of neural network algorithms.

The use of optical fiber passing through the interface between two media (aggressive and safe) allows for the electrical explosion safety of the system, since the optical fiber is a high-quality and reliable electrical insulator. In addition, the low level of attenuation of the light signal in the optical fiber allows it to be used for remote monitoring of an object located at a distance of up to several kilometers.

Introduced into the known device additional features and functional relationships allow you to give the proposed system new significant properties.

Claims (1)

  1. Intelligent system for remote control of the position of the working body inside a confined space, containing a enclosed space enclosure located in an aggressive environment, with an optical unit installed on it containing a collimator and an optical window, an electronic unit for controlling and processing information, geographically remote from the enclosed space enclosure, which includes a processor, an optical transmitter, an optical receiver and an analog-to-digital converter (ADC), the first output of the processor connected to an optical transmitter, the second processor output is the output of an electronic unit for controlling and processing information, made in the form of an interface line for communication with external devices, the output of the optical receiver is connected to the ADC input, the output of which is connected to the processor input, characterized in that inside the case confined space there is a working body with a retroreflector mounted on it, between the first input / output of the collimator of the optical unit and the retroreflector is formed collimated the luminous flux passing through the optical window of the optical unit and consisting of light rays incident and reflected from the retroreflector, the second input / output of the collimator is the input / output of the optical unit, an optical circulator is introduced into the electronic unit for controlling and processing information, the input of which is connected to the output optical transmitter, and the output is connected to the input of the optical receiver, the input / output of the optical circulator is the input / output of the electronic unit for controlling and processing information, input / output opt The main unit is connected to the input / output of the electronic unit for controlling and processing information through an optical fiber passing through the partition of aggressive and safe environments and made with the possibility of ensuring explosion safety.
RU2016134678A 2016-08-24 2016-08-24 Intelligent system for remote control of working body position inside closed space RU2628867C1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU246107A1 (en) * Liquid level sensor
US5194747A (en) * 1991-10-21 1993-03-16 Midland Manufacturing Corp. Liquid level gauge comparing moldulations of incident and reflected loser beams
US5438420A (en) * 1993-08-09 1995-08-01 Vickers, Incorporated Monitoring of fluid contamination level wherein the light energy is focused on the fluid passage means
US7635854B1 (en) * 2008-07-09 2009-12-22 Institut National D'optique Method and apparatus for optical level sensing of agitated fluid surfaces
RU2580907C1 (en) * 2015-02-12 2016-04-10 Владимир Иванович Мельников Ultrasonic waveguide level meter for liquid

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU246107A1 (en) * Liquid level sensor
US5194747A (en) * 1991-10-21 1993-03-16 Midland Manufacturing Corp. Liquid level gauge comparing moldulations of incident and reflected loser beams
US5438420A (en) * 1993-08-09 1995-08-01 Vickers, Incorporated Monitoring of fluid contamination level wherein the light energy is focused on the fluid passage means
US7635854B1 (en) * 2008-07-09 2009-12-22 Institut National D'optique Method and apparatus for optical level sensing of agitated fluid surfaces
RU2580907C1 (en) * 2015-02-12 2016-04-10 Владимир Иванович Мельников Ultrasonic waveguide level meter for liquid

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Effective date: 20181009