CN102706409A - Relevant method for improving signal-to-noise ratio of passive nucleon level gage - Google Patents
Relevant method for improving signal-to-noise ratio of passive nucleon level gage Download PDFInfo
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- CN102706409A CN102706409A CN2012102020424A CN201210202042A CN102706409A CN 102706409 A CN102706409 A CN 102706409A CN 2012102020424 A CN2012102020424 A CN 2012102020424A CN 201210202042 A CN201210202042 A CN 201210202042A CN 102706409 A CN102706409 A CN 102706409A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/284—Electromagnetic waves
- G01F23/288—X-rays; Gamma rays or other forms of ionising radiation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/80—Arrangements for signal processing
- G01F23/802—Particular electronic circuits for digital processing equipment
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/80—Arrangements for signal processing
- G01F23/802—Particular electronic circuits for digital processing equipment
- G01F23/804—Particular electronic circuits for digital processing equipment containing circuits handling parameters other than liquid level
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- Engineering & Computer Science (AREA)
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- Fluid Mechanics (AREA)
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Abstract
The invention relates to the technical field of measurement of passive nucleon levels, in particular to a method for improving the signal-to-noise ratio of a passive nucleon level gage. According to the method, a passive nucleon level measuring device and a calculation technology are provided. The method comprises the following steps that: (a) the passive nucleon level measuring device is provided with two gamma ray detectors, one gamma ray detector is used for monitoring the variable quantity of gamma ray radioactive intensity inside a detected container, and the other gamma ray detector is used for monitoring the variable quantity of environmental gamma ray radioactive intensity outside the detected container; and (b) the variable quantity of the environmental gamma ray radioactive intensity is deducted from the variable quantity of the gamma ray radioactive intensity inside the detected container to eliminate influences of environmental gamma rays and improve the signal-to-noise ratio. By the method, the variable quantity of the environmental gamma rays is included in influence factors and is eliminated, so that the measurement accuracy is improved; and three interchangeable methods are provided, so that influences of the environmental gamma rays on the gamma ray detectors for measuring nucleon levels inside the detected container are eliminated, the selectivity is improved, and the reliability of increased data can be inspected.
Description
[technical field]
The present invention relates to passive nucleon level gauging technical field, be specifically related to a kind of method that improves passive nucleon level-sensing device signal to noise ratio (S/N ratio).
[background technology]
In industries such as chemical industry, metallurgy, coal, electric power, in the process of convey materials, often need to measure the material level in hopper, the feed bin.
Existing utilize the method for gamma rays measurement object position to mainly contain two kinds: a kind of is the nucleon level-sensing device of traditional band radioactive source; Like the disclosed a kind of automatic charge level control device of domestic patent CN202230393, its essence is that gamma ray post symmetrical about utilization measures the material level in the material level storehouse; Another kind then is not to be with radioactive source; Utilize the no radioactive source nucleon level-sensing device of the natural gamma rays measurement object position of tested material and environment; Be called for short passive nucleon level-sensing device; Passive nucleon level-sensing device makes the gamma radiation property and the gamma radiation property realization non-cpntact measurement thing position in the environment of tested container place that just utilize tested material self without radioactive source become simple effectively with feasible, makes script need to use the field of nucleon level-sensing device to be replaced by passive nucleon level-sensing device, has significantly reduced the usage quantity of radioactive source; Remove high radioactive source handling cost from, reduced the radiation risk.
Alarm mode according to level gauging can be divided into switching regulator and two kinds of forms of continous way again.The switching regulator level meter is meant can only differentiate the level meter whether height of materials reaches desired location and export the switching value signal, comprises the full warning of material and expects empty the warning; The continous way level meter is meant the level meter that can tell concrete height of materials and export one or more continuous material level signals.
Along with measuring accuracy requires to uprise, to report to the police that reliability requirement uprises, signal to noise ratio (S/N ratio) is lower, or hopes to use when realizing measuring than the gamma detector of muting sensitivity, just need to improve the signal to noise ratio (S/N ratio) of passive nucleon level-sensing device.Domestic patent CN200610118890 and domestic patent are the disclosed a kind of passive nucleon apparatus for measuring charge level of CN201010296383; All be to utilize to add the influence that is located at radioactive ray in the outside radiation shield shielding environment of detector; Reduce with material level and change incoherent environment ray; Thereby the raising signal to noise ratio (S/N ratio), but can not fundamentally eliminate the influence of the variation of environment ray to the measurement material level.
[summary of the invention]
The objective of the invention is to improve the deficiency of prior art, the method for the passive nucleon level-sensing device signal to noise ratio (S/N ratio) of a kind of comprehensive, simple, easy row raising is provided.
For realizing above-mentioned purpose, design a kind of relevant method that improves passive nucleon level-sensing device signal to noise ratio (S/N ratio), comprise passive nucleon apparatus for measuring charge level and computing technique, it is characterized in that this method adopts with reference to method, may further comprise the steps:
(a) said passive nucleon apparatus for measuring charge level is provided with two gamma-ray detectors; A gamma-ray detector is used to monitor the gamma ray activity variable quantity that tested container inside changes with material level; Another gamma-ray detector is gamma-ray detector as a reference, the variable quantity of the environment gamma ray activity self that monitoring tested container outside does not change with material level;
(b) will monitor the environment gamma rays radioactive intensity variable quantity that gamma rays radioactive intensity variable quantity deduction reference gamma ray detector that the inner gamma ray detectors of tested container measures measures; The calculating material level changes; Eliminate the influence of the variation of environment gamma rays radioactive intensity self, improve passive nucleon level-sensing device signal to noise ratio (S/N ratio) the inner gamma-ray detector of monitoring tested container.
This method adopts multiple equilibrium computing method alternative reference method, need not increase referential gamma ray detection, is applicable to the situation that a plurality of measurement points are arranged in the similarity measure zone, may further comprise the steps:
(a) the gamma radiation property intensity data of all measurement points being measured is input in a passive nucleon level-sensing device or the independent processing unit through communication interface;
(b) calculate the mean change amount of environment gamma rays radioactive intensity by this passive nucleon level-sensing device or processing unit, and output to the passive nucleon level-sensing device of all measurement points through communication interface;
(c) by the mean change amount of each passive this environment gamma rays radioactive intensity of nucleon level-sensing device deduction, calculate material level and change, eliminate the variable effect of environmental radiation self, improve passive nucleon level-sensing device signal to noise ratio (S/N ratio).
This method adopts characteristic ray method alternative reference method, need not increase referential gamma ray detection, may further comprise the steps:
(a) measure to confirm in tested material self gamma radiation and environmental radiation different character gamma rays;
(b) identify this characteristic ray in the gamma rays that passive nucleon level-sensing device detects from gamma ray detectors;
(c) only calculate material level with the Strength Changes of this characteristic gamma rays and change, the influence of filtering environmental radiation variation improves passive nucleon level-sensing device signal to noise ratio (S/N ratio).
The said position that its measurement is not exerted an influence when being chosen in material level and changing with reference to the reference gamma ray detector installation site of measuring tested container external environment condition gamma ray activity variable quantity in the method and direction of measurement.
In the said multiple equilibrium computing method; Variation according to environmental radiation self is consistent to the influence of each measurement point; When many, the probability that the actual material level of each measurement point changes synchronously is very little characteristics with measurement point, calculates the synchronous variable quantity of the gamma ray that each level-sensing device measures; The difference of the gamma ray activity rate of change that variation causes according to material level and the rate of change of environment gamma ray activity identifies environment gamma ray activity and changes.
The present invention compared with prior art; List the variable quantity of environment gamma ray in influence factor and participate in material level calculating; Perhaps utilize the characteristic ray of tested material fundamentally to eliminate environmental impact; Improved the degree of accuracy of measuring, provide with reference to method, multiple equilibrium computing method and characteristic ray method and can eliminate of the influence of environment gamma ray variable quantity according to the method for actual measurement situation mutual alternative for three kinds tested container inside gamma-ray detector; Both increased when the user measures according to the selectivity of actual measurement situation, can be used as the confidence level that the method for inspection increases data again.
[description of drawings]
Fig. 1 is the passive nucleon level-sensing device internal hardware structural representation that the present invention relates to;
Fig. 2 is that the passive nucleon level-sensing device that the present invention relates to is used synoptic diagram;
Fig. 3 is the hardware configuration synoptic diagram of the switching regulator flying dust level-sensing device of band reference gamma ray detector of the present invention;
1. materials, 2. tested containers, 3. gamma-ray detectors, 4. detector carriage among the figure
[embodiment]
In conjunction with accompanying drawing the present invention is described further, its method can realize this professional domain technician.
The invention provides 3 covers and can be based on the improvement that existing passive nucleon level-sensing device is measured account form according to the method for the mutual replacement of actual conditions.
The passive nucleon level-sensing device that uses among the embodiment is as shown in Figure 1 mainly to be comprised: (1) gamma ray detectors, select the NaI scintillation detector for use, and be used to measure the gamma ray intensity of tested material and tested container place environment; (2) signal processing module; Be used to handle collected gamma ray intensity signal; Send alerting signal, remove alerting signal according to predefined switching point in conjunction with software, or export the electronic circuit of continuous material level signal according to the relation of gamma ray intensity that obtains in advance and material level; (3) material level signal output module is used for the electronic circuit of the alerting signal of signal processing module output, alarm release signal, the output of material level signal, can be light, sound, I/O mouth, relay, analogue quantity output circuit, communication interface etc.; (4) supplementary module, comprise mounting bracket, improve signal to noise ratio (S/N ratio) ray shielding device, cable splice, antenna, be used for the relation curve parameter of configuration switch point or gamma ray intensity and material level handheld device, be used for the communication facilities of exchange message between the passive nucleon level-sensing device etc.; (6) software is used to control gamma detector, handles gamma signal and output alarm signal, releasing alerting signal or continuous material level signal, realizes the set of all correlative codes of communication or man-machine conversation or the like function.
Method provided by the invention is applied in the passive nucleon flying dust of the switching regulator level-sensing device; Measure the material level in electric precipitator or the sack cleaner ash bucket; Used electric precipitator or sack cleaner ash bucket are as shown in Figure 2 for the shape of falling rectangular pyramid steel plate structure, highly 5-8 rice, inclination angle 60 degree, outside are provided with the color steel of thick insulation material of 20-40cm and protection insulation material; Inner tested material is the temperature that forms behind the coal dust firing at 135-450 ℃ flying dust; In view of temperature, the stickiness of flying dust and the impulsive force of the ash that falls, and flying dust has stronger gamma radiation property.It is very desirable in the position monitoring of ash bucket ash, adopting method of the present invention, and step is following:
Suppose the full gamma ray intensity N2 of material, expect empty gamma ray intensity N1, then signal to noise ratio (S/N ratio) a=N2/N1.
(1) classic method one
Shielding changes incoherent environment ray with material level.The thickness of screen layer reduces except the material level beyond the sensitive direction and changes incoherent environment ray in the thickening switching regulator flying dust level-sensing device.Suppose to have reduced n, then new signal to noise ratio (S/N ratio) a1=(N2-n)/(N1-n).Obvious a1>a.
(2) classic method two
Strengthen with material level and change relevant environment ray.On the outer wall of measured ash bucket, increase the gamma rays shielding material.Then can the empty gamma ray intensity N1 of material be reduced n.Because the shielding action of ash self and the radioactivity of self are done the N2 influence little like this.Then new signal to noise ratio (S/N ratio) a2=N2/ (N1-n).Obvious a2>a.
(3) eliminate the influence that environmental radiation changes
(A) another one reference gamma ray detector is installed near the measured point; This detector also is the part of level-sensing device; It is inner to be installed in the flying dust level-sensing device, and it is outside also can independently to be installed in the flying dust level-sensing device, the change information of the environment gamma rays of its measurement; Both can use also can near other flying dust level-sensing devices jointly for its independent use.Particular location and installation direction should make its sensitive direction not towards ash bucket, and between itself and ash bucket, shield assembly are set.
The variation n of reference gamma ray detector monitoring of environmental radiation measures with the gamma ray detectors that the inner measurement ash position of switching regulator flying dust level-sensing device changes simultaneously.
The environmental radiation that the gamma radiation variation deduction reference gamma ray detector that the gamma ray detectors that switching regulator flying dust level-sensing device internal measurement ash position changes measures measures changes; The common material level that calculates changes, and has just eliminated the influence of the variation of environmental radiation self.
(B) since below the fly-ash separator ash bucket quantity many, also very concentrated, be well suited for variation with multiple equilibrium computing method elimination environmental radiation self.
The gamma radiation property intensity data of measuring the switching regulator flying dust level-sensing device of all measurement points through communication interface focuses in the switching regulator flying dust level-sensing device; Comprehensively judge by this switching regulator flying dust level-sensing device, calculate the variation of environmental radiation, and notify the switching regulator flying dust level-sensing device of all measurement points; Variable quantity by each this environmental radiation of switching regulator flying dust level-sensing device deduction calculates material level again and changes, and has just eliminated the influence that environmental radiation changes.
(C), can also adopt the characteristic ray method to improve signal to noise ratio (S/N ratio) because the gamma radiation of flying dust is more intense.Identify the characteristic ray that energy is 1.4MeV in the gamma rays that switching regulator flying dust level-sensing device detects from gamma ray detectors, only the Strength Changes with the characteristic gamma rays of this energy serves as to change according to calculating material level.Just can consider influence except that the variation of environment radiation self.
Claims (5)
1. a relevant method that improves passive nucleon level-sensing device signal to noise ratio (S/N ratio) comprises passive nucleon apparatus for measuring charge level and computing technique, it is characterized in that this method adopts with reference to method, may further comprise the steps:
(a) said passive nucleon apparatus for measuring charge level is provided with two gamma-ray detectors; A gamma-ray detector is used to monitor the gamma ray activity variable quantity that tested container inside changes with material level; The gamma-ray detector of another increase is gamma-ray detector as a reference, the variable quantity of the environment gamma ray activity self that monitoring tested container outside does not change with material level;
(b) will monitor the environment gamma rays radioactive intensity variable quantity that gamma rays radioactive intensity variable quantity deduction reference gamma ray detector that the inner gamma ray detectors of tested container measures measures; The calculating material level changes; Eliminate the influence of the variation of environment gamma rays radioactive intensity self, improve passive nucleon level-sensing device signal to noise ratio (S/N ratio) the inner gamma-ray detector of monitoring tested container.
2. a kind of relevant method that improves passive nucleon level-sensing device signal to noise ratio (S/N ratio) as claimed in claim 1; It is characterized in that this method adopts multiple equilibrium computing method alternative reference method; Need not increase referential gamma ray detection; Be applicable to the situation that a plurality of measurement points are arranged in the similarity measure zone, may further comprise the steps:
(a) the gamma radiation property intensity data of all measurement points being measured is input in a passive nucleon level-sensing device or the independent processing unit through communication interface;
(b) calculate the mean change amount of environment gamma rays radioactive intensity by this passive nucleon level-sensing device or processing unit, and output to the passive nucleon level-sensing device of all measurement points through communication interface;
(c) by the mean change amount of each passive this environment gamma rays radioactive intensity of nucleon level-sensing device deduction, calculate material level and change, eliminate the variable effect of environmental radiation self, improve passive nucleon level-sensing device signal to noise ratio (S/N ratio).
3. a kind of relevant method that improves passive nucleon level-sensing device signal to noise ratio (S/N ratio) as claimed in claim 1 is characterized in that this method adopts characteristic ray method alternative reference method, need not increase referential gamma ray detection, may further comprise the steps:
(a) measure to confirm in tested material self gamma radiation and environmental radiation different character gamma rays;
(b) identify this characteristic ray in the gamma rays that passive nucleon level-sensing device detects from gamma ray detectors;
(c) only calculate material level with the Strength Changes of this characteristic gamma rays and change, the influence of filtering environmental radiation variation improves passive nucleon level-sensing device signal to noise ratio (S/N ratio).
4. a kind of relevant method that improves passive nucleon level-sensing device signal to noise ratio (S/N ratio) as claimed in claim 1 is characterized in that the said position that its measurement is not exerted an influence when being chosen in material level and changing with reference to the reference gamma ray detector installation site of measuring tested container external environment condition gamma ray activity variable quantity in the method and direction of measurement.
5. a kind of relevant method that improves passive nucleon level-sensing device signal to noise ratio (S/N ratio) as claimed in claim 2; It is characterized in that in the said multiple equilibrium computing method; Variation according to environmental radiation self is consistent to the influence of each measurement point; When many, the probability that the actual material level of each measurement point changes synchronously is very little characteristics with measurement point, calculates the synchronous variable quantity of the gamma ray that each level-sensing device measures; The difference of the gamma ray activity rate of change that variation causes according to material level and the rate of change of environment gamma ray activity identifies environment gamma ray activity and changes.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012102020424A CN102706409A (en) | 2012-06-19 | 2012-06-19 | Relevant method for improving signal-to-noise ratio of passive nucleon level gage |
| PCT/CN2012/080199 WO2013189126A1 (en) | 2012-06-19 | 2012-08-16 | Method related to improving signal-to-noise ratio in passive nucleonic level gauge |
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| CN2012102020424A CN102706409A (en) | 2012-06-19 | 2012-06-19 | Relevant method for improving signal-to-noise ratio of passive nucleon level gage |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107478296A (en) * | 2016-06-08 | 2017-12-15 | 郑州立子加速器科技有限公司 | A kind of X ray level-sensing device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111179432A (en) * | 2019-10-18 | 2020-05-19 | 北京中智核安科技有限公司 | Passive efficiency calibration method for gamma radioactivity activity measurement |
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| GB2322189A (en) * | 1997-02-13 | 1998-08-19 | British Steel Plc | Metal level detection |
| CN101709988A (en) * | 2009-12-10 | 2010-05-19 | 昝昕武 | Method for sensing automotive oil level and sensor |
| CN101957226A (en) * | 2010-09-29 | 2011-01-26 | 上海辉博自动化仪表有限公司 | Passive nuclear material level measurement device |
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| US6071340A (en) * | 1996-02-28 | 2000-06-06 | General Signal Technology Corporation | Apparatus for melt-level detection in Czochralski crystal growth systems |
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| EP1039273B1 (en) * | 1999-03-24 | 2007-11-28 | Siemens Aktiengesellschaft | Fluid level measurement method |
| DE10162703A1 (en) * | 2001-12-19 | 2003-07-03 | Endress & Hauser Gmbh & Co Kg | Method and device for fault suppression and compensation of interference signals caused by gammagraphy in radiometric measuring systems |
| CN1198120C (en) * | 2003-03-14 | 2005-04-20 | 郭云昌 | Method for measuring object-position utilizing natural radioctivity |
| JP4752264B2 (en) * | 2004-12-21 | 2011-08-17 | Ｊｆｅスチール株式会社 | Method and apparatus for measuring melt level in blast furnace |
| CN101493354B (en) * | 2009-03-01 | 2010-07-07 | 太原理工大学 | Material level detecting method for ball mill based on multi-sensor fusing technology |
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- 2012-08-16 WO PCT/CN2012/080199 patent/WO2013189126A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19540182A1 (en) * | 1995-10-27 | 1997-04-30 | Meselektronik Dresden Gmbh I G | Device and measuring method for determining the degree of absorption and / or scatter of a medium |
| GB2322189A (en) * | 1997-02-13 | 1998-08-19 | British Steel Plc | Metal level detection |
| CN101709988A (en) * | 2009-12-10 | 2010-05-19 | 昝昕武 | Method for sensing automotive oil level and sensor |
| CN101957226A (en) * | 2010-09-29 | 2011-01-26 | 上海辉博自动化仪表有限公司 | Passive nuclear material level measurement device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107478296A (en) * | 2016-06-08 | 2017-12-15 | 郑州立子加速器科技有限公司 | A kind of X ray level-sensing device |
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| WO2013189126A1 (en) | 2013-12-27 |
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Application publication date: 20121003 |