CN1039110A - Method and device thereof with the RF determination metal liquid level - Google Patents
Method and device thereof with the RF determination metal liquid level Download PDFInfo
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- CN1039110A CN1039110A CN 88105082 CN88105082A CN1039110A CN 1039110 A CN1039110 A CN 1039110A CN 88105082 CN88105082 CN 88105082 CN 88105082 A CN88105082 A CN 88105082A CN 1039110 A CN1039110 A CN 1039110A
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Abstract
The invention provides with radio frequency sensing and measure the method for metal liquid level and with the device of RF determination metal liquid level, this device comprises the emission ring that is arranged on groove and wraps, receive ring and radio-frequency (RF) emission system, preposition amplification and information handling system are formed.Characteristics of the present invention are that cost is low, easy and simple to handle, and measuring accuracy can reach below the 1mm, can be widely used in preparing the The real time measure of the metal liquid level in fields such as the crystallization tank of spray tank, continuous casting system of amorphous material and the surplus steel tonnage of ladle.
Description
The invention belongs to a kind of technical field of measuring the horizontal level of liquid metal, be specially adapted to smelt, the detecting in real time of the metal liquid level in the various industrial processes such as casting and amorphous material preparation.
The detection problem of the metal liquid level that is faced in metallurgical process, people once did a large amount of work, as once proposing various schemes such as mechanical floats method, isotope detection method, supersonic testing method, photoelectric detection method and electromagnetic method.Yet, have in these schemes coarse, precision is not high, have involve great expense or harmful, bring inconvenience to practical application.Nineteen eighty-two Sweden STUDsVIK company takes electromagnetic method to solve slag indication and control problem in the continuous casting system.But and unresolved liquid level is indicated problem continuously.The method of successful EDDY CURRENT continuous casting crystallining groove metal liquid level is studied by NKK Corp in 1984, but because the limitation of its mechanism is unsuitable for general occasion, such as the situation of sealing, thereby is restricted in practical application.Aspect the monitoring of preparation spray tank liquid level during amorphous material, known to relevant information, abroad realize with isotope method, and this method cost height not only, and have public hazards, thereby be not suitable for present actual production conditions.
Based on above-mentioned situation, the object of the present invention is to provide a kind of measuring accuracy height, can indicate metal liquid level, applied widely continuously, there be not the method and the device thereof of public hazards and cheap mensuration metal liquid level.
Fig. 1 is the propagation synoptic diagram of plane electromagnetic wave by medium and metal;
Fig. 2 be plane electromagnetic wave by medium at metal surface reflections propagate synoptic diagram;
Fig. 3 is the system diagram with the RF determination metal liquid level provided by the invention;
Fig. 4 is radio-frequency transmissions ring provided by the invention and the synoptic diagram that is provided with that receives ring;
Fig. 5 shows radio-frequency transmissions ring provided by the invention and receives the synoptic diagram that ring is provided with another kind of form;
Fig. 6 a～Fig. 6 e is provided by the invention with RF determination metal liquid level manipulated or operated apparatus;
During metal liquid level uniform motion that Fig. 7 provides for the embodiment of the invention, output level and liquid level relation curve;
The metal liquid level ladder that Fig. 8 provides for the embodiment of the invention is static during with free dredging flow, output level and liquid level relation curve.
According to Theory of Electromagnetic Field, electromagnetic wave can be propagated by dielectric losslessly, but decays rapidly with index law in metal material, and in fact electromagnetic wave can not be propagated by the metal of adequate thickness, can only reflect in the metal surface. According to shown in Figure 1, if the dimension of molten metal piece is enough big, with the incident electromagnetic wave of the complete screening of radiation of activation on it, following relational expression there is obviously this moment:
S-S′＝α·h+β （1）
Wherein, S and S ' are respectively the electromagnetism wave energy circulation of incident and outgoing; H is the metal liquid level height; α is a proportionality constant, and it depends on metal liquid level maximum height and total incident energy circulation S, and β is for revising constant.Equally, according to shown in Figure 2, the energy circulation of being sent by emitter is the electromagnetic beam of S, and receiving by the receiving device that be arranged in parallel with emitter after the surface reflection of molten metal piece circulation to be the part electromagnetic beam of S ', obviously S ' amount changes with liquid level h, that is:
S-S′＝α′·h+β′ （2）
In the formula, α ' is a proportionality constant, and it depends on the liquid level maximum height, the energy circulation S of emission and spacing, the emission angle of emission and receiving device, and β ' is for revising constant.This shows, no matter (1) formula or (2) formula, metal liquid level h value is linear with energy circulation S ' value of being accepted, thereby can learn liquid level h value by the measurement of S ' value.For selecting suitable electromagnetic wave bands, though can adopt microwave, infrared light, visible light even X ray in principle,, the factor of aspect such as consider cost, technology measure, field condition, manipulate, the present invention adopts radio-frequency range.
According to shown in Figure 3, method with the RF determination metal liquid level provided by the invention is with by first carrier-frequency oscilaltor (1), second carrier-frequency oscilaltor (2), the hold concurrently radio frequency of voltage amplifier (3) and carrier frequency power amplifier (4) output of mixing is surveyed the emission ring (5) that the liquid metal groove wraps and is sent by being arranged at, and by by with acceptance ring (5 ') received RF that this liquid metal groove is wrapped that is arranged at of emission ring symmetric arrangement, and receive radiofrequency signal that ring received by the preposition amplification of the high Q first detector (6) of holding concurrently, active narrow band filter (7), the second carrier voltage amplifier (8), the second carrier frequency power amplifier (9) and the impedance conversion second detector (10) of holding concurrently carries out information processing.The metal liquid level information that draws therefrom can be gone into fluid level gauge (MLLI), liquid level recorder (MLLR) or tank level control system (MLLCS) respectively.Because the energy circulation that the emission environment-development goes out is the modulation that the radiofrequency signal of S is subjected to metal liquid level, receive the energy circulation of encircling the radiofrequency signal of being received and reduce to S ' value, thereby reception encircles the electromagnetic energy of interference that the minimum energy circulation S ' min that is received is greater than the liquid metal groove bag surrounding environment of surveying, and accept ring and emission ring and the moving range that must consider the liquid metal level plane is set, thereby ensure measuring accuracy what groove was wrapped.
According to shown in Figure 4, measure the ladle of surplus steel tonnage or the metal liquid level in the mensuration spray tank when the preparation amorphous material, to launch ring (5) and be arranged at groove bag (11) fire brick layer with reception ring (5 '), and the equal and opposite in direction of emission ring and reception ring, emission ring and reception ring symmetric arrangement.Do not adopt the groove bag of box hat for shell, will the emission ring with receive the outer wall that ring can be arranged on groove bag fire brick layer.
According to shown in Figure 5, mensuration to conticaster crystallization tank metal liquid level, owing to crystallization tank bag (12) is to be made by metallic copper, thereby will launch ring (5) and be arranged on the same surface level on crystallization tank bag top with receiving ring (5 '), utilize radio frequency to realize the Level Detection purpose in the reflection of metal bath surface.
Isolated plant with the RF determination metal liquid level provided by the invention, shown in Fig. 3 and Fig. 6 a～Fig. 6 e, this device by first carrier-frequency oscilaltor (1), second carrier-frequency oscilaltor (2), mixing hold concurrently voltage amplifier (3), carrier frequency power amplifier (4), emission ring (5), receive ring (5 '), the preposition amplification of high Q first detector (6), active narrow band filter (7), the second carrier voltage amplifier (8), the second carrier frequency power amplifier (9) and the impedance conversion second detector (10) of holding concurrently of holding concurrently and form.Further described below in conjunction with its circuit diagram.
Shown in Fig. 6 a, by transistor Q
1And Q
2, quartz crystal QC, capacitor C
1And the rf oscillation signal of the first carrier frequency high frequency oscillator (HFG) generation of some resistance formations, via transistor Q
3The emitter follower (EF) that constitutes is sent to the A end; By transistor Q
4The Hartley oscillator (LFG) that constitutes is delivered to the A end with the oscillator signal that is produced through isolation filter, with the first CF signal superposition.
Shown in Fig. 6 b, by transistor Q
5The logical frequency-selective amplifying stage (BSA) of the band that constitutes will also amplify in this grade mixing from the carrier frequency superposition signal of A end.In order to obtain enough voltage amplitudes mixing and amplifying signal are introduced by transistor Q
6The voltage amplifier stage (SPREA) that constitutes, and pass through by transistor Q
7The power that constitutes promotes level, transistor Q
8The power output stage that constitutes is after traffic filter and variable reactance cause emission ring T
1Send radio frequency.
Shown in Fig. 6 c, come self-emission ring T
1Radiofrequency signal modulate through metal liquid level, by receiving ring T
2Receive, and feed preposition amplification and information handling system.Hybrid integrated circuit IC
1And each LC resonant tank constitutes high Q frequency-selecting prime amplifier (PREA), and IC
1In operational amplifier with by Ri, C
7, C
8The low-pass filter that constitutes is as first detector (D
1), IC
2And IC
3Form capacitance-resistance bridge band and be connected with power filter (BPF) to obtain second CF signal.
Shown in Fig. 6 d, the signal of C, D end feeds by IC
4The voltage gain stages (VG) that constitutes wherein in order to eliminate the influence that floats because of the issuable frequency of second carrier-frequency oscilaltor, adds R
14, R
15, C
14, C
15The capacitance-resistance feedback network that constitutes.Radiofrequency signal by voltage gain enters by IC
5And Q
1, Q
2The second carrier frequency power gain level (PG) that constitutes is held output by E, F.
Shown in 6e, the signal of E, F end enters the second detector stage (D that is made of impedance conversion and detecting element
2), acquisition reflects the electric signal of liquid level thus.This signal can be delivered to liquid level recorder device (MLLR), liquid level indication mechanism (MLLI) or tank level control system (MLLCS) respectively.
The present invention have characteristics such as cost is low, simple to operate, nuisanceless, and its measuring accuracy can reach below the 1mm according to method and device thereof with the RF determination metal liquid level that foregoing provided.Except, requiring according to groove bag concrete actual can METHOD FOR CONTINUOUS DETERMINATION more than 8 hours to metal liquid level.The present invention is applicable to the spray tank of preparation amorphous material, the mensuration of the metal liquid level in fields such as the surplus steel tonnage of the crystallization tank of continuous casting system and ladle.
Embodiment provided by the invention.
The present invention is with in the amorphous material preparation facilities, and it is embodiment that the metal liquid level of spray tank is measured simulated experiment.To encircle by emission ring and the reception that resistant to elevated temperatures siderochrome aluminium or nickel-chrome are made, be symmetricly set in the fire brick layer of spray tank, and press method and the device shown in Fig. 3 and Fig. 6 a～Fig. 6 e, adopt X-Y recorder (its y axle sensitivity is 100mV/cm, and T scanning is 10s/cm) to record two groups of empirical curves.
Among Fig. 7, a and b are respectively that liquid level at the uniform velocity rises and the at the uniform velocity dynamic output level and the liquid level relation curve of system when descending.Because liquid level is a uniform motion in this experiment, therefore be that the recording curve of horizontal ordinate in fact just is the curve of horizontal ordinate with the liquid level with time, the two only differs from a velocity factor.Curve clearlys show that system's output level becomes good linear relationship with liquid level, and small distortion is only arranged in the end.This small distortion mainly is the phenomenon that departs from plane wave when the ring edge is encircled or received to liquid level near emission from the radio frequency that causes, i.e. " edge effect ".It does not influence measurement generalized case, and the useable linear measure is proofreaied and correct during if any specific (special) requirements.
Among Fig. 8, a and b provide the test result of static liquid level of ladder and free dredging flow liquid level respectively.The former is by setting the accuracy and stability that different static liquid levels comes observing system to measure; The latter carries out dynamic test by free dredging flow to liquid level change, and obviously experimental result is an anti-square of curve, by bernoulli's equation this result can be described well, thereby clearly show the linear relationship between system's output level and the liquid level.
Claims (6)
1, a kind of method with the RF determination metal liquid level, it is characterized in that will be by first carrier-frequency oscilaltor, second carrier-frequency oscilaltor, the hold concurrently radio frequency of voltage amplifier and carrier frequency power amplifier output of mixing is surveyed the emission environment-development that the liquid metal groove wraps and is gone out by being arranged at, and by by receiving radio frequency with the reception articulating that this liquid metal groove wraps that is arranged at of emission ring symmetric arrangement, and receive radiofrequency signal that ring received by the preposition amplification of the high Q first detector of holding concurrently, active narrow band filter, the second carrier voltage amplifier, the second carrier frequency power amplifier and the impedance conversion second detector of holding concurrently carries out information processing, and gained metal liquid level information is sent into fluid level gauge or liquid level recorder;
2,, it is characterized in that encircling the fire brick layer that is symmetricly set on the groove bag sidewall with emission with receiving ring according to the described a kind of method of claim 1 with the RF determination metal liquid level.
3,, it is characterized in that will launch ring to the groove bag of being made by metal material encircles the groove bag sidewall top that is arranged on the same surface level with reception according to the described a kind of method of claim 1 with the RF determination metal liquid level.
4, a kind of device with the RF determination metal liquid level, it is characterized in that this device is by first carrier-frequency oscilaltor, second carrier-frequency oscilaltor, the mixing voltage amplifier of holding concurrently, the carrier frequency power amplifier, the emission ring, receive ring, the preposition amplification of the high Q first detector of holding concurrently, active narrow band filter, the second carrier voltage amplifier, the second carrier frequency power amplifier and the impedance conversion second detector of holding concurrently is formed, by first carrier-frequency oscilaltor, the oscillation frequency that second carrier-frequency oscilaltor sends is imported the mixing voltage amplifier of holding concurrently respectively, go out by the emission environment-development through the carrier frequency power amplifier, and receive signal that articulating receives through the preposition amplification of the too high Q first detector of holding concurrently, active narrow band filter, the second carrier voltage amplifier, hold concurrently second detector output of the second carrier frequency power amplifier and impedance conversion;
5,, it is characterized in that the emission ring and receive ring making by the siderochrome aluminum according to the described a kind of device of claim 4 with the RF determination metal liquid level;
6,, it is characterized in that the emission ring and receive ring making by the nickel-chrome material according to the described a kind of device of claim 4 with the RF determination metal liquid level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88105082 CN1039110A (en) | 1988-06-28 | 1988-06-28 | Method and device thereof with the RF determination metal liquid level |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88105082 CN1039110A (en) | 1988-06-28 | 1988-06-28 | Method and device thereof with the RF determination metal liquid level |
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|---|---|
| CN1039110A true CN1039110A (en) | 1990-01-24 |
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| CN 88105082 Pending CN1039110A (en) | 1988-06-28 | 1988-06-28 | Method and device thereof with the RF determination metal liquid level |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100439877C (en) * | 2005-06-03 | 2008-12-03 | 都灵无线基金会 | Method and apparatus for detecting the parameter of liquid state metal in a container |
| CN100445703C (en) * | 2003-12-23 | 2008-12-24 | 茵爱莎公司 | Non-invasive method for detecting and measuring filling material in vessels |
| CN101287327B (en) * | 2007-04-13 | 2011-07-20 | 中微半导体设备(上海)有限公司 | Radio frequency power source system and plasma reactor chamber using the radio frequency power source system |
| CN103562693A (en) * | 2011-06-24 | 2014-02-05 | 株式会社尼利可 | Molten metal level measurement device and molten metal level measurement method |
| CN106896160A (en) * | 2015-12-17 | 2017-06-27 | 中国石油天然气股份有限公司 | The signal excitation circuit of pipeline anticorrosion coating repaired mouth quality of adhesive detection machine |
| CN107423672A (en) * | 2017-05-10 | 2017-12-01 | 广州智慧城市发展研究院 | A kind of fingerprint recognition sensing chip framework of RF-type |
-
1988
- 1988-06-28 CN CN 88105082 patent/CN1039110A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100445703C (en) * | 2003-12-23 | 2008-12-24 | 茵爱莎公司 | Non-invasive method for detecting and measuring filling material in vessels |
| CN100439877C (en) * | 2005-06-03 | 2008-12-03 | 都灵无线基金会 | Method and apparatus for detecting the parameter of liquid state metal in a container |
| CN101287327B (en) * | 2007-04-13 | 2011-07-20 | 中微半导体设备(上海)有限公司 | Radio frequency power source system and plasma reactor chamber using the radio frequency power source system |
| CN103562693A (en) * | 2011-06-24 | 2014-02-05 | 株式会社尼利可 | Molten metal level measurement device and molten metal level measurement method |
| CN103562693B (en) * | 2011-06-24 | 2016-01-06 | 株式会社尼利可 | Level of molten metal determinator and molten metal bath position measuring and modelling method |
| CN106896160A (en) * | 2015-12-17 | 2017-06-27 | 中国石油天然气股份有限公司 | The signal excitation circuit of pipeline anticorrosion coating repaired mouth quality of adhesive detection machine |
| CN107423672A (en) * | 2017-05-10 | 2017-12-01 | 广州智慧城市发展研究院 | A kind of fingerprint recognition sensing chip framework of RF-type |
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