• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A method and a device for determining or observing the average particle size or particle size distribution in a flow of material, such as a slurry, wherein the material is allowed to flow at a constant velocity through a radiation beam, the time interval distribution of the radiation quanta passing through the material flow is measured, this distribution describing the particle size distribution and offering a possibility to control any changes in the size distribution, and from the measured time interval distribution is subtracted the known time interval distribution of the quanta of the radiation beam emitted by the source of radiation, this known distribution being a Poisson distribution, and, finally, the particle size or size distribution is determined arithmetically on the basis of the observed change in the time interval distribution. Preferably, the source of radiation is an X-ray tube or a radio isotope source, and the radiation detector may be a scintillation detector, a proportional counter or a semi-conductor detector.
    公开号:SU1074417A3
    申请号:SU772519801
    申请日:1977-09-07
    公开日:1984-02-15
    发明作者:Йоханнес Сипиля Хейкки；Юхани Ууситало Сеппо
    申请人:Оутокумпу Ой (Фирма)；
    IPC主号:
    专利说明:

    2, A device for determining the size distribution of particles in a material flow, containing a source of x-ray quanta, a collimator, a series-connected detector of x-ray quanta passed through a stream of particles and an amplitude discriminator, a means of forming fine particles of particle flow, capable of moving with
    constant speed, located between the source and the detector of x-ray quanta, is correct because it is equipped with a sequentially switched bistable trigger, a converter of time intervals into the amplitude of pulses and analysis. the torus amplitude pulse, and the output of the amplitude discriminator is connected to the trigger bistability input
    The invention relates to the control of materials using ionizing radiation, more specifically to the method of determining the size of particles in a material flow, and can be used, for example, to granulate the analysis of various materials. A known method for analyzing the characteristics of particles in a material flow, including the irradiation of a controlled material with an ionizing radiation source, the registration of radiation scattered by particles of a material, measurement of a signal proportional to the intensity of the recorded radiation l. The one disadvantage of the known method is the low accuracy of measurement of particle size distribution, since the intensity of scattered radiation depends on the average density of the particle flux, and their speed, and to a lesser extent on the particle size,. The closest technical solution to the invention is determining the size distribution of particles in a material flow, including passing a narrow beam of x-ray quanta through a stream of particles moving at a constant speed, registering quanta that have passed through the said particles 2 flow. The method is implemented by a device for determining the size distribution of particles in a material flow, containing a source of x-ray quanta, a collimator, successively connected detector of x-ray quanta passed through a stream of particles and amplitude discriminator means for forming a fine stream of particles located between the source and detector of x-ray quanta 2 The disadvantage of this method is the low accuracy of measurement of particles of small size, which is associated with a low intensity recorded i rad Because of the need to use X-ray quanta p $ 1sm, PSchde dka a few mic {5on. ; .-; , :. , The purpose of the invention is to improve the accuracy of measurement of particles of small size,; /, L: -. ..:,. The goal is achieved by the fact that, according to the method of determining the size distribution of cha: particles in the noTOjce of a material, 3 including in passing a narrow ray of x-ray quanta through a stream of particles moving at a constant particle velocity, the registration of quanta passing through the particle flux, records the distribution of time intervals between x-ray particles beam quanta before and after passing the particles through the particle stream, subtract the distribution of the lateral intervals between the ray quanta before passing; the particle flux from the time interval distribution between the quanta that have passed through the particle flux and from the obtained difference in the time interval distributions determine the particle size distribution,.,; ..; Moreover, a device containing an X-ray quanta source, a collimator, a successively connected brush of X-ray quanta passing through a stream of particles and an amplitude discriminator, a means of forming a thin layer of particles capable of moving at a constant speed, located between the source and the X-ray quanta detector are equipped with a series-connected bistable trigger. transducer time intervals in the amplitude of the pulses and the pulse amplitude analyzer, and the output of the amplitude analyzer is connected to the input of a bistable trigger. The drawing shows a diagram of an apparatus that implements a method for determining the distribution of particles in a material flow.
    The device contains an X-ray source 1, a means for shaping a thin stream of 2 particles, a collimator 3, which is used to create an X-ray quantum beam that is sequentially connected to a 4f a detector, a 1-digit discriminator 5, a bistable trigger 6, a 7 times interval in the pulse amplitude, analyzer 8 ampliTyjDi pulses.
    The method is carried out with a pgbote device as follows.
    The narrow beam of the x-ray quanta of source 1 is transmitted through a stream of 2 particles of material. Come on. renggenov1 (and the quanta are recorded by the detector 4. The collimator 3 forms a quantum beam, the dimensions of which are chosen so as to prevent several particles in the x-ray at the same time.: Particles of a thin ceiling 2 are directed across the quantum beam with a constant speed. discriminator 5 Provides registration of quanta of such energy, at which particles of flow 2 practically completely absorb quanta, and the medium in which the particles move, does not lipktively absorb quanta of the x-ray x-ray. Only 7 and the analyzer 8 provide the registration of the time intervals between the x-ray photons before and after the passage of the quanta through a stream of 2 particles.
    The distribution of time intervals between quanta before passing through stream 2 is governed by the Poisson distribution, i.e. i (i) i C is the average value of the time interval. When a stream of particles passes through an x-ray beam, a change in the initial distribution of time intervals occurs. This change carries information about the size of the particles in the flow 2, due to the fact that the particle absorbs one or several beams with a certain probability, depending on
    5 from fucked dimensions, x-ray quanta. - At a constant particle flow rate and for sufficiently small x-ray dimensions and thickness of the flow 2, the particle size and the time they pass through the beam are ngd
    0 in direct relation with each other. . Poets 4U, registering the distribution of the time intervals between the quanta after passing an x-ray beam through a stream of 2 particles, taking into account
    5, the known distribution between the quantates of source 1 can fix the average particles, their size distribution, and the particle flux density.
    0
    I., Such a method and apparatus can improve the accuracy of measuring small particles with a size of a few microns or less.
    five
    权利要求:
    Claims (2)
    [1]
    1. A method for determining the distribution of particle sizes in a material stream, which consists in transmitting! of a narrow beam of x-ray quanta through a stream of particles moving at a constant speed, registration of quanta passing through the aforementioned particle stream, with the exception that, in order to improve the accuracy of measuring small particles, the distribution of time of the intervals between the x-ray quanta of the beam before and after the passage of the quanta through the particle stream, subtract the distribution of time internals, the loy between the quantum of the beam before the passage of the particle flux from the distribution of time intervals between the quantum through the aforementioned particle flow, and from the obtained difference in the distribution of time intervals determine the distribution of particle sizes.
    .. SU m . 1074417
    [2]
    2. A device for determining the distribution of particle sizes in a material stream, containing a source of X-ray quanta, a collimator, a series-connected detector of X-ray quanta passing through the particle stream and an amplitude discriminator, means for forming a fine particle stream made with the possibility of movement at a constant speed located between the source X-ray quantum detector, due to the fact that it is equipped with a bistable trigger, a converter slots in amplitude and pulse analyzer, torus pulse amplitude, the output of the amplitude discriminator is connected to the input of bistable flip-flop.
    类似技术:
    公开号 | 公开日 | 专利标题
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    同族专利:
    公开号 | 公开日
    PL111369B1|1980-08-30|
    ZM6877A1|1978-06-21|
    AU2859377A|1979-03-15|
    AU515031B2|1981-03-12|
    FI53630C|1978-06-12|
    ZA775008B|1978-06-28|
    PL200678A1|1978-04-10|
    CA1076713A|1980-04-29|
    PH15843A|1983-04-08|
    FI53630B|1978-02-28|
    MX147065A|1982-09-30|
    US4180735A|1979-12-25|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US3449567B1|1967-01-23|1982-10-05|
    US3982183A|1975-02-20|1976-09-21|Coulter Electronics, Inc.|Particle sizing apparatus|
    US4063820A|1975-11-10|1977-12-20|Rca Corporation|Apparatus for measuring a dimension of an object|DE2915986C2|1979-04-20|1982-04-08|Kernforschungszentrum Karlsruhe Gmbh, 7500 Karlsruhe|Process for the continuous measurement of element contents|
    FR2605738B1|1986-10-24|1989-12-08|Schlumberger Cie Dowell|RADIATION DENSIMETER WITH INTEGRATED COMPOSITE TUBE AND APPLICATIONS IN PARTICULAR TO OIL FLUIDS|
    DE3776270D1|1986-10-24|1992-03-05|Pumptech Nv|SYSTEM FOR CONNECTING A METAL CONNECTING PIECE AND A HIGH PRESSURE PIPE MADE OF COMPOSITE MATERIAL, IN PARTICULAR FOR APPLICATION TO DEVICES IN THE PETROLEUM INDUSTRY.|
    US5710069A|1996-08-26|1998-01-20|Motorola, Inc.|Measuring slurry particle size during substrate polishing|
    US6246474B1|1998-04-29|2001-06-12|Particle Measuring Systems, Inc.|Method and apparatus for measurement of particle size distribution in substantially opaque slurries|
    EP1703276B1|2005-03-17|2012-05-02|PANalytical B.V.|X-ray apparatus|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    FI762578A|FI53630C|1976-09-08|1976-09-08|PROCEDURE FOR THE ORIGINATION OF A PARTICULAR BOX AND UPPER LOCKING OF MATERIALS|
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