JP6654761B2 - Image analysis type particle size distribution analyzer - Google Patents
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Description
本発明は、画像解析型の粒度分布測定装置に関し、特に、測定対象の粒子の流れを液中に形成して粒子画像を取得し、画像解析に基づく粒度分布を得る測定装置に関する。 The present invention relates to an image analysis type particle size distribution measuring apparatus, and more particularly to a measurement apparatus that forms a flow of particles to be measured in a liquid to acquire a particle image and obtain a particle size distribution based on image analysis.
従来、湿式フローセルを用いた画像解析型の粒度分布計として、ジャスコインタナショナル製の粒度分布計ＩＦ‐２００ｎａｎｏがある。この粒度分布計では、図６に示すように、粒子を含む液体がフローセル２に送られ、一方の窓板２ａを介して照明装置４によって照射され、他方の窓板２ｂを介してカメラ６により粒子画像が取得される。フローセル２は組立式であり、窓板間のスペーサ２ｃの厚さを変更することで内部空間の厚さを変更できるようになっている。もちろんセル内の流路は出入り口を除いて密閉である。また、液中への粒子の注入にはシリンジ８および三方弁８ａを用いる。このような粒度分布計を用いれば、粒子径２００ｎｍから１ｍｍまでの粒子を測定できる（非特許文献１）。
しかし、非特許文献１の粒度分布計では、粒子注入用のシリンジ８や組立式フローセル２を用いるので、測定対象の粒子径には上限があり、測定できる粒子径の分布範囲が狭いという課題があった。
Conventionally, as an image analysis type particle size distribution meter using a wet flow cell, there is a particle size distribution meter IF-200nano manufactured by Jusco International. In this particle size distribution meter, as shown in FIG. 6, a liquid containing particles is sent to a flow cell 2, illuminated by a lighting device 4 via one window plate 2a, and by a camera 6 via the other window plate 2b. A particle image is obtained. The flow cell 2 is of an assembling type, and the thickness of the internal space can be changed by changing the thickness of the spacer 2c between the window plates. Of course, the flow path in the cell is closed except for the entrance. The syringe 8 and the three-way valve 8a are used for injecting particles into the liquid. By using such a particle size distribution meter, particles having a particle diameter of 200 nm to 1 mm can be measured (Non-Patent Document 1).
However, since the particle size distribution meter of Non-Patent Document 1 uses the syringe 8 and the assembled flow cell 2 for injecting particles, there is an upper limit on the particle size of the measurement target, and the problem that the distribution range of the measurable particle size is narrow is problematic. there were.
一方、特許文献１には、比較的大きな粒子径まで測定対象にできる画像解析型の粒度分布計が開示されている。この粒度分布計は、乾式分散タイプと呼ばれ、振動篩などで粒子を乾式で分散した後、自由落下させて粒子画像を取得する。粒子が移動する経路は、開放型と言える。このような粒度分布計を用いれば、粒子径で約０．１ｍｍから約３ｍｍまでという比較的幅広い粒度分布の粒子を測定できることが示されている（特許文献１）。 On the other hand, Patent Literature 1 discloses an image analysis type particle size distribution meter that can measure a relatively large particle size. This particle size distribution meter is called a dry-dispersion type, in which particles are dry-dispersed with a vibrating sieve or the like, and then dropped freely to obtain a particle image. The path along which the particles move can be said to be open. It is disclosed that the use of such a particle size distribution meter enables measurement of particles having a relatively wide particle size distribution of about 0.1 mm to about 3 mm in particle diameter (Patent Document 1).
しかし、特許文献１のような乾式分散タイプの粒度分布計では、粒子が振動篩などと直に接触し、自由落下後の衝撃も大きく、粒子の変形や損傷の心配がある。また、ゴム状の粒子など液体中での保管に適する粒子の場合、乾式分散タイプよりも湿式分散タイプの粒度分布計の方がふさわしい。
本発明は上記課題に鑑みなされたものであり、画像解析型の粒度分布測定装置において、湿式分散タイプであっても比較的幅広い粒度分布の粒子を測定可能な粒度分布測定装置を提供することにある。
However, in a dry-dispersion type particle size distribution meter as disclosed in Patent Literature 1, the particles come into direct contact with a vibrating sieve or the like, the impact after free fall is large, and there is a concern that the particles are deformed or damaged. Further, in the case of particles suitable for storage in a liquid such as rubber-like particles, a wet dispersion type particle size distribution meter is more suitable than a dry dispersion type.
The present invention has been made in view of the above problems, and in an image analysis type particle size distribution measuring device, to provide a particle size distribution measuring device capable of measuring particles of a relatively wide particle size distribution even in a wet dispersion type. is there.
前記目的を達成するために本発明に係る粒度分布測定装置は、
液体中の複数の粒子の粒子画像に基づいて粒度分布を測定する装置であって、
平坦な傾斜面を有する透光性の開放型の流路部材と、
前記傾斜面上を流れる液体中の複数の粒子に向けて該傾斜面越しに光を照射する照射手段と、
前記傾斜面から見て前記照射手段とは反対側の位置から前記傾斜面上の液体中の複数の粒子を継続的に撮像する撮像手段と、
前記撮像手段から得た粒子画像に基づいて個々の粒子の大きさを表す値を求め、複数の粒子画像から得られた値を積算することで、粒度分布を算出する画像解析手段と、を備えることを特徴とする。
なお、前記撮像手段は、前記傾斜面から見て前記照射手段とは反対側の位置から該傾斜面越しに液体中の複数の粒子を撮像するように配置され、前記照射手段は、前記傾斜面上を流れる液体中の複数の粒子に向けて光を直接照射するように配置されていてもよい。
In order to achieve the above object, a particle size distribution measuring device according to the present invention,
An apparatus for measuring a particle size distribution based on a particle image of a plurality of particles in a liquid,
A light-transmitting open channel member having a flat inclined surface,
Irradiation means for irradiating light over the inclined surface toward a plurality of particles in the liquid flowing on the inclined surface,
Imaging means for continuously imaging a plurality of particles in the liquid on the inclined surface from a position opposite to the irradiation means when viewed from the inclined surface,
Image analysis means for calculating a particle size distribution by calculating a value representing the size of each particle based on the particle image obtained from the imaging means, and integrating values obtained from the plurality of particle images. It is characterized by the following.
Note that the imaging unit is arranged to image a plurality of particles in the liquid over the inclined surface from a position opposite to the irradiating unit when viewed from the inclined surface, and the irradiating unit includes the irradiating surface. It may be arranged to irradiate light directly to a plurality of particles in the liquid flowing thereon.
従来の組立式フローセルの流路は、出入口を除くと密閉された空間であり、大きな流量を流せなかった。
これに対して、本発明の測定装置の構成であれば、粒子を含む液体は、開放された空間を傾斜面に沿って流れ落ちるようになる。開放型の流路では、流量を大きくすることが容易で、比較的大きな流量でも安定した流れが得られ、水面の乱れも少なくなる。そして、撮像手段がこのような流れを撮像することで、鮮明な粒子画像が得られ、個々の粒子がはっきりと認識される。また、飛沫や気泡による誤認も少なくなる。さらに、比較的大きな粒子が混ざっていてもスムーズな流れを維持することができる。例えば、粒子径で１ｍｍから１０ｃｍの粒度分布を示すような粒子の測定に適する。
粒子を含む液体を自由落下させる場合と比較すると、本発明のように傾斜面を流す方が、水面の散乱光を小さく抑えられる。また、自由落下に比べて、飛沫または気泡の発生が少なくなるから、これらを粒子と誤認する可能性も小さい。
以上の説明のように、本発明の測定装置であれば、湿式分散タイプであっても、数ｍｍから数ｃｍまでの比較的幅広い粒度分布の粒子を測定可能で、その測定結果に対する信頼性も高い画像解析型の粒度分布測定装置を提供することができる。
また、傾斜面を有する流路部材と照明手段と撮像手段を設置するスペースさえ確保できれば、測定対象である粒子の製造ライン、検査ライン、その他の粒子を扱うラインに容易に組み込めるため、オンラインでの粒度分布測定に適する。
The flow path of the conventional assembling type flow cell is a closed space except for the entrance and exit, and a large flow rate cannot be flowed.
On the other hand, according to the configuration of the measuring device of the present invention, the liquid containing particles flows down the open space along the inclined surface. In the open type flow path, it is easy to increase the flow rate, a stable flow can be obtained even at a relatively large flow rate, and turbulence on the water surface is reduced. Then, by the imaging means imaging such a flow, a clear particle image is obtained, and individual particles are clearly recognized. In addition, misperceptions due to splashes and bubbles are reduced. Further, a smooth flow can be maintained even when relatively large particles are mixed. For example, it is suitable for measuring particles having a particle size distribution of 1 mm to 10 cm in particle diameter.
Compared to the case where the liquid containing particles is allowed to fall freely, the scattered light on the water surface can be suppressed to a small degree by flowing the liquid through the inclined surface as in the present invention. Further, compared to free fall, the generation of droplets or bubbles is reduced, and the possibility of erroneously identifying these as particles is small.
As described above, the measuring device of the present invention can measure particles having a relatively wide particle size distribution from several mm to several cm, even if it is a wet dispersion type, and the reliability of the measurement result is also high. A high image analysis type particle size distribution measuring device can be provided.
In addition, as long as the space for installing the flow path member having the inclined surface, the illuminating means, and the imaging means can be secured, it can be easily incorporated into the production line, the inspection line, and other lines for handling particles to be measured. Suitable for particle size distribution measurement.
また、本発明に係る粒度分布測定装置は、更に前記流路部材の前記傾斜面の傾きを可変にする可変手段を備えることが好ましい。このような構成であれば、液体の粘性が大きい場合に、傾斜角を大きくして安定した流れを維持できる。また、粒子径が大きい場合にも傾斜角を大きくすることで、同様の効果が得られる。 In addition, it is preferable that the particle size distribution measuring device according to the present invention further includes a variable unit that varies the inclination of the inclined surface of the flow path member. With such a configuration, when the viscosity of the liquid is large, a stable flow can be maintained by increasing the inclination angle. Further, even when the particle diameter is large, the same effect can be obtained by increasing the inclination angle.
以下、図面に基づき本発明の好適な実施形態について説明する。図１に示すように、本実施形態の画像解析型の粒度分布計は、平坦な傾斜面を有する透光性材料製の流路部材１０に、測定対象である粒子を含んだ透明液体（以降、粒子含有液体と呼ぶ。）を流して、平坦な傾斜面越しに粒子に対して光を照射し、傾斜面の上方から粒子画像を撮像するということに特徴がある。このような流路をここでは開放型流路と呼び、従来にない流路を用いた湿式分散タイプの粒度分布計を構成する。 Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the image analysis type particle size distribution meter according to the present embodiment is configured such that a transparent liquid containing particles to be measured (hereinafter referred to as a “liquid”) , Which is called a particle-containing liquid), irradiates the particles with light over a flat inclined surface, and captures a particle image from above the inclined surface. Such a flow path is herein referred to as an open flow path, and constitutes a wet dispersion type particle size distribution meter using an unconventional flow path.
図２に基づいて粒度分布計の概略構成を説明する。粒度分布計は、透光性材料製の流路部材１０と、流路部材１０上を流れる粒子を照射する照明装置２０と、粒子画像を撮像する撮像装置３０と、流路部材１０から排出される粒子含有液体を受け入れる貯留槽４０と、粒子含有液体を流路部材１０に案内する導入部材５０とを備える。また、制御・データ処理システムとして、照明装置２０および撮像装置３０の動作を制御する制御装置６０と、撮像された粒子画像を解析して粒子に関する分布データを作成する画像解析装置７０とを備える。 The schematic configuration of the particle size distribution meter will be described based on FIG. The particle size distribution meter includes a flow path member 10 made of a translucent material, an illumination device 20 that irradiates particles flowing on the flow path member 10, an imaging device 30 that captures a particle image, and a discharge device A storage tank 40 for receiving the particle-containing liquid, and an introduction member 50 for guiding the particle-containing liquid to the flow path member 10. The control / data processing system includes a control device 60 that controls the operations of the illumination device 20 and the imaging device 30, and an image analysis device 70 that analyzes a captured particle image and creates distribution data on the particles.
流路部材１０は、粒子含有液体を安定して流すことができる平坦な傾斜面１２上を有するものであればよい。例えば、図２のように、３枚のアクリル板を断面コの字状に接合して形成された流路部材を用いてもよい。
照明装置２０は、傾斜面１２上を流れる液体中の複数の粒子に向けて傾斜面１２越しに光を照射する。例えば、図２のような平面発光型の照明器具を用いて、傾斜面１２の裏側の面に向けて、光を均一に照射するように配置してもよい。
The channel member 10 may have a flat inclined surface 12 through which the particle-containing liquid can flow stably. For example, as shown in FIG. 2, a flow path member formed by joining three acrylic plates in a U-shaped cross section may be used.
The illumination device 20 irradiates light through the inclined surface 12 toward a plurality of particles in the liquid flowing on the inclined surface 12. For example, it may be arranged such that light is uniformly emitted toward the surface on the back side of the inclined surface 12 using a flat light emitting type lighting fixture as shown in FIG.
撮像装置３０は、傾斜面１２から見て照明装置２０とは反対側の位置から傾斜面１２上の液体中の複数の粒子を撮像する。本実施形態では、照明装置２０からの光による粒子の陰が撮像される。撮像装置３０は最終的に粒子画像を取得できればよい。静止画像を断続的に取得するようにしてもよいし、動画を撮像して、適宜、動画データから静止画像を取得するようにしてもよい。なお、撮像装置３０が静止画像を断続的に取得する場合、照明装置２０は粒子を連続的に照射してもよいし、あるいは、撮像のタイミングで閃光を断続的に照射するようにストロボ光源で構成されていてもよい。
なお、傾斜面１２上に流す粒子含有液体の流量は、撮像装置３０のカメラ深度（被写界深度とも呼ぶ）の範囲になるように調整するのがよい。
The imaging device 30 images a plurality of particles in the liquid on the inclined surface 12 from a position opposite to the lighting device 20 when viewed from the inclined surface 12. In the present embodiment, the shadow of the particles due to the light from the illumination device 20 is imaged. The imaging device 30 only needs to be able to finally obtain a particle image. A still image may be obtained intermittently, or a moving image may be captured, and a still image may be obtained from the moving image data as appropriate. When the imaging device 30 acquires a still image intermittently, the illumination device 20 may irradiate the particles continuously, or a strobe light source may emit the flash light intermittently at the timing of imaging. It may be configured.
Note that the flow rate of the particle-containing liquid flowing on the inclined surface 12 is preferably adjusted so as to be in the range of the camera depth of the imaging device 30 (also referred to as the depth of field).
貯留槽４０は、単に粒子含有液体を溜めるだけではなく、次の工程にその液体を搬送するように構成された貯留槽にしてもよい。このようにすれば、本実施形態の粒度分布計を粒子の製造ライン等に組み込む際に有効である。貯留槽４０の代わりに、次工程に粒子含有液体を連続して供給するための排出流路を設けてもよい。 The storage tank 40 may not only store the liquid containing particles, but may also be a storage tank configured to transport the liquid to the next step. This is effective when the particle size distribution meter of the present embodiment is incorporated in a particle production line or the like. Instead of the storage tank 40, a discharge channel for continuously supplying the particle-containing liquid to the next step may be provided.
導入部材５０は、上流から送られてくる粒子含有液体の水流の乱れを流路部材１０に入る前段で低減させて、一定流速にして流路部材１０に供給するために、設けられている。そのため、導入部材５０の流路断面形状は、流路部材１０の流路断面と同じにするとよい。この導入部材５０を設けなくても本発明の粒度分布計は成り立つが、導入部材５０を設けることで液体中に粒子をより確実に分散させることができる。また、このような導入部材５０を設ければ、例えば上流からは液体のみを流して安定流を保っておき、導入部材５０の流路にて粒子を投入することで、流路部材１０に粒子含有液体の安定流を形成することもできる。このように流路部材１０における撮像エリアの上流に導入部材５０による安定流化エリアを形成することで、測定精度がさらに向上する。 The introduction member 50 is provided in order to reduce the turbulence of the water flow of the particle-containing liquid sent from the upstream in the stage before entering the flow path member 10 and supply the flow to the flow path member 10 at a constant flow rate. Therefore, the cross-sectional shape of the flow channel of the introduction member 50 may be the same as the cross-sectional shape of the flow channel of the flow channel member 10. Even if the introduction member 50 is not provided, the particle size distribution meter of the present invention can be realized. However, by providing the introduction member 50, the particles can be more reliably dispersed in the liquid. In addition, if such an introduction member 50 is provided, for example, only the liquid is allowed to flow from the upstream to maintain a stable flow, and the particles are injected into the flow path member 10 by introducing the particles into the flow path member 10. A stable flow of the contained liquid can also be formed. By forming the stable flow area by the introduction member 50 upstream of the imaging area in the flow path member 10 in this manner, the measurement accuracy is further improved.
解析装置７０は、撮像装置３０によって得られた粒子画像に基づいて個々の粒子の大きさ（面積など）を表す値を求めて粒度分布を算出する。解析装置７０に、粒子画像に基づいて個々の粒子の形状を表す値を求めてその形状分布を算出するようにしてもよい。ここで、粒子の大きさを、様々なサイズパラメータ（平均径、円面積相当径、最大内接円径など）を用いて数値化処理するとよい。また、粒子の形状も、様々な形状パラメータ（伸び率、円形度など）を用いて数値化処理してもよい。このような画像解析によって、それぞれのパラメータによる粒度分布データや形状分布データを算出することができる。 The analysis device 70 calculates a particle size distribution by obtaining a value representing the size (area or the like) of each particle based on the particle image obtained by the imaging device 30. The analysis device 70 may calculate a value representing the shape of each particle based on the particle image and calculate the shape distribution. Here, the particle size may be numerically processed using various size parameters (average diameter, equivalent circular area diameter, maximum inscribed circle diameter, etc.). Further, the shape of the particles may be digitized using various shape parameters (elongation, circularity, etc.). Through such image analysis, it is possible to calculate the particle size distribution data and the shape distribution data using the respective parameters.
本実施形態のおける測定対象の粒子とは、大きさと形状の異なる複数の粒子のうちの個々の粒子を指す。測定対象の粒子は、さまざまな素材のものを使用できる。粒度分布が粒子径で１ｍｍから１０ｃｍという比較的大きな粒子を含む、幅広い粒度分布の粒子に対する測定に、本実施形態の粒度分布計が適する。また、ゴム状で互いに付きやすい特性の粒子は、液体中に保管されるものが多い。また、物性等の制約があって液中で管理される粒子もある。そのような粒子の製造ライン等で、上流側で液体に入った状態の粒子を、そのままオンライン上で粒度分布計に供給するようにすれば、製造工程や検査工程など粒子を扱うライン上でその粒度分布を確認することができる。 The particles to be measured in the present embodiment refer to individual particles among a plurality of particles having different sizes and shapes. Particles of various materials can be used as particles to be measured. The particle size distribution meter according to the present embodiment is suitable for measurement of particles having a wide particle size distribution, including particles having a relatively large particle size distribution of 1 mm to 10 cm. In addition, rubber-like particles that easily adhere to each other are often stored in a liquid. There are also particles that are controlled in a liquid due to restrictions on physical properties and the like. If the particles in the liquid on the upstream side are supplied directly to the particle size distribution meter online on such a production line of such particles, etc. The particle size distribution can be confirmed.
また、液体は、粒子が溶けない種類のものを選択するとよい。液体は光を透す性質を有すればよく、水や油、有機溶媒などを利用できる。また、液体の種類に応じて流路部材の材質を選定するとよい。有機溶媒の場合は、例えばガラス製の流路部材を用いるとよい。液体中で粒子が極力ばらついた状態を維持するように、傾斜面の角度や流速を調整できるようにするとよい。また、液体の比重により沈み易さが変わるので、粒子に応じて溶媒の種類を変更してもよい。 Further, as the liquid, it is preferable to select a liquid in which the particles do not dissolve. The liquid only needs to have a property of transmitting light, and water, oil, an organic solvent, or the like can be used. Further, the material of the flow path member may be selected according to the type of the liquid. In the case of an organic solvent, for example, a flow path member made of glass may be used. It is preferable that the angle of the inclined surface and the flow velocity can be adjusted so as to maintain the state where the particles are dispersed in the liquid as much as possible. Further, since the ease of sinking changes depending on the specific gravity of the liquid, the type of the solvent may be changed according to the particles.
以上のような粒度分布計による測定方法の一例を図３に基づいて説明する。
まず、上流から粒子含有液体を導入部材５０に供給する。供給直後の粒子含有液体は水流に乱れがあるが、導入部材５０から透光性の流路部材１０に移る段階では水流が安定して一定速度になる。傾斜面１２上を流れる液体中の粒子に向けて、照明装置２０を用いて光を傾斜面１２越しに照射する。また、傾斜面１２上を流れる液体中の粒子の粒子画像を撮像装置３０によって断続的に取得する。取得した粒子画像を解析装置７０で画像解析する。図４に粒子画像の一例を模式的に示す。所望のサイズパラメータまたは形状パラメータに基づいて、粒度分布データまたは形状分布データを算出する。
粒度分布計を粒子の製造ライン等に組み込んだ場合は、算出した分布データをモニター等に表示させて、粒子の大きさまたは形状をオンラインで確認できるようにしてもよい。また、分布データを外部の監視機器に伝送して、遠隔で分布データを自動監視できるようにしてもよい。
なお、撮像装置３０によって取得する粒子画像の一枚から必要な分布データを算出してもよいし、断続的に取得される個々の粒子画像の解析結果を積算して、複数の粒子画像に基づく分布データを算出するようにしてもよい。
An example of a measuring method using the above particle size distribution meter will be described with reference to FIG.
First, the liquid containing particles is supplied to the introduction member 50 from the upstream. Although the particle-containing liquid immediately after the supply has turbulence in the water flow, the water flow is stabilized at a constant speed at the stage of moving from the introduction member 50 to the light-transmitting flow path member 10. Light is applied to the particles in the liquid flowing on the inclined surface 12 through the inclined surface 12 using the illumination device 20. Further, the image of the particles in the liquid flowing on the inclined surface 12 is intermittently acquired by the imaging device 30. The obtained particle image is image-analyzed by the analysis device 70. FIG. 4 schematically shows an example of the particle image. Particle size distribution data or shape distribution data is calculated based on a desired size parameter or shape parameter.
When the particle size distribution meter is incorporated in a particle production line or the like, the calculated distribution data may be displayed on a monitor or the like so that the size or shape of the particle can be checked online. Alternatively, the distribution data may be transmitted to an external monitoring device so that the distribution data can be automatically monitored remotely.
In addition, necessary distribution data may be calculated from one particle image acquired by the imaging device 30, or analysis results of individual particle images acquired intermittently may be integrated and based on a plurality of particle images. Distribution data may be calculated.
本実施形態の粒度分布計であれば、粒子含有液体は、開放空間である傾斜面１２に沿って流れ落ちるので、流量を大きくすることが容易になり、比較的大きな流量でも安定した流れが得られ、水面の乱れも抑えられる。照射光が水流をきれいに抜けて、個々の粒子像をくっきりと映し出すことができる。傾斜面１２が平らであるから、平坦な水面となり、水面による散乱光も低減できる。粒子を含む液体を自由落下させる場合は、水流の表面による散乱光が多く、鮮明な粒子画像を得られない。また、自由落下に比べて、飛沫または気泡の発生が少なくなるから、これらを粒子と誤認する可能性も小さくなる。飛沫のような水滴は黒く映ってしまい、粒子と誤認されるからである。
また、比較的大きな粒子が混ざっていても流量を調整することでスムーズな流れを維持することができる。
In the case of the particle size distribution meter according to the present embodiment, the particle-containing liquid flows down along the inclined surface 12 which is an open space, so that it is easy to increase the flow rate, and a stable flow can be obtained even at a relatively large flow rate. The turbulence of the water surface is also suppressed. Irradiation light can pass through the water stream neatly, and individual particle images can be clearly displayed. Since the inclined surface 12 is flat, it becomes a flat water surface, and scattered light by the water surface can be reduced. When the liquid containing particles is allowed to fall freely, a large amount of light is scattered by the surface of the water stream, and a clear particle image cannot be obtained. Further, compared to free fall, the generation of droplets or bubbles is reduced, and the possibility of misidentifying these as particles is also reduced. This is because water droplets such as droplets appear black and are mistaken for particles.
Even if relatively large particles are mixed, a smooth flow can be maintained by adjusting the flow rate.
さらに、傾斜面１２を有する流路部材１０と照明装置２０と撮像装置３０を設置するスペースさえ確保できれば、測定対象である粒子の製造ライン、検査ライン、その他の粒子を扱うラインに容易に組み込めるため、オンラインでの粒子の大きさや形状の測定に非常に有効である。 Furthermore, as long as the space for installing the flow path member 10 having the inclined surface 12, the illumination device 20, and the imaging device 30 can be ensured, it can be easily incorporated into a production line of a particle to be measured, an inspection line, and other lines that handle particles. It is very effective for online particle size and shape measurement.
図５に本実施形態の粒度分布計の変形例を示す。この粒度分布計では、流路部材１１０に対する照明装置１２０および撮像装置１３０の配置が逆になっている。照明装置１２０は、平坦な傾斜面１１２上の液体中の粒子に対して光を直接照射する。また、撮像装置１３０は、傾斜面１１２から見て照明装置１２０とは反対側の位置から傾斜面１１２越しに液体中の複数の粒子を撮像する。流路部材１１０から排出される粒子含有液体は、後段に設けられた送液部材１４０を流れて次工程に送られる。
また、図５の粒度分布計には、流路部材１１０の傾斜角を調整する角度調整機構１１４が設けられている。角度調整機構１１４は、流路部材の平坦面１１２の上端部に設けられた回転支持軸を有する。平坦面１１２がこの軸を中心にスイングするように構成されている。より好ましくは、流路部材１１０とともに撮像装置１３０および照明装置１２０が一体で、軸を中心に回転支持されているとよい。また、前段の導入部材１５０も一体で回転支持されるようにしてもよい。
FIG. 5 shows a modification of the particle size distribution meter of the present embodiment. In this particle size distribution meter, the arrangement of the illumination device 120 and the imaging device 130 with respect to the flow path member 110 is reversed. The illumination device 120 directly irradiates light on particles in the liquid on the flat inclined surface 112. Further, the imaging device 130 images a plurality of particles in the liquid from the position opposite to the lighting device 120 when viewed from the inclined surface 112 through the inclined surface 112. The particle-containing liquid discharged from the flow path member 110 flows through a liquid sending member 140 provided at a subsequent stage, and is sent to the next step.
Further, the particle size distribution meter of FIG. 5 is provided with an angle adjusting mechanism 114 for adjusting the inclination angle of the flow path member 110. The angle adjusting mechanism 114 has a rotation support shaft provided at the upper end of the flat surface 112 of the flow path member. The flat surface 112 is configured to swing about this axis. More preferably, the imaging device 130 and the illuminating device 120 together with the flow path member 110 may be integrally supported by rotation about an axis. Further, the introduction member 150 at the preceding stage may be integrally supported by rotation.
このような変形例の構成であれば、液体の粘性に応じて、傾斜面１１２の傾斜角を調整することで、安定した流れを維持できる。また、粒子径に応じて傾斜角を調整することで、同様の効果が得られる。
なお、図５に示すように、粒度分布計を覆う屋根部材２３０を設けて、屋根部材２３０から暗幕２１０，２２０を垂らし、流路部材１１０と照明装置１２０と撮像装置１３０が暗室に配置されるようにしてもよい。暗室での画像を取得すれば、天井照明など不要な光が粒子を照射しないので、より鮮明な粒子画像が得られる。
With such a configuration of the modification, a stable flow can be maintained by adjusting the inclination angle of the inclined surface 112 according to the viscosity of the liquid. The same effect can be obtained by adjusting the inclination angle according to the particle diameter.
As shown in FIG. 5, a roof member 230 that covers the particle size distribution meter is provided, and blackout curtains 210 and 220 are hung from the roof member 230, and the flow path member 110, the illumination device 120, and the imaging device 130 are arranged in a dark room. You may do so. If an image is obtained in a dark room, unnecessary light such as ceiling illumination does not irradiate the particles, so that a clearer particle image can be obtained.
１０，１１０ 流路部材
２０，１２０ 照明装置（照射手段）
３０，１３０ 撮像装置（撮像手段）
４０ 貯留槽
５０，１５０ 導入部材
６０ 制御装置
７０ 解析装置（画像解析手段）
１１４ 角度調整機構（可変手段）
１４０ 送液部材
10, 110 flow path member 20, 120 lighting device (irradiation means)
30, 130 imaging device (imaging means)
40 storage tanks 50, 150 introduction member 60 control device 70 analysis device (image analysis means)
114 Angle adjustment mechanism (variable means)
140 Liquid sending member
Claims (3)
平坦な傾斜面を有する透光性の開放型の流路部材と、
前記傾斜面上を流れる液体中の複数の粒子に向けて該傾斜面越しに光を照射する照射手段と、
前記傾斜面から見て前記照射手段とは反対側の位置から前記傾斜面上の液体中の複数の粒子を継続的に撮像する撮像手段と、
前記撮像手段から得た粒子画像に基づいて個々の粒子の大きさを表す値を求め、複数の粒子画像から得られた値を積算することで、粒度分布を算出する画像解析手段と、
を備えることを特徴とする画像解析型の粒度分布測定装置。 An apparatus for measuring a particle size distribution based on a particle image of a plurality of particles in a liquid,
A light-transmitting open channel member having a flat inclined surface,
Irradiation means for irradiating light over the inclined surface toward a plurality of particles in the liquid flowing on the inclined surface,
Imaging means for continuously imaging a plurality of particles in the liquid on the inclined surface from a position opposite to the irradiation means when viewed from the inclined surface,
Image analysis means for calculating a particle size distribution by calculating a value representing the size of each particle based on the particle image obtained from the imaging means, and integrating the values obtained from the plurality of particle images ,
An image analysis type particle size distribution measuring device, comprising:
平坦な傾斜面を有する透光性の開放型の流路部材と、
前記傾斜面上を流れる液体中の複数の粒子に向けて光を照射する照射手段と、
前記傾斜面から見て前記照射手段とは反対側の位置から該傾斜面越しに液体中の複数の粒子を継続的に撮像する撮像手段と、
前記撮像手段から得た粒子画像に基づいて個々の粒子の大きさを表す値を求め、複数の粒子画像から得られた値を積算することで、粒度分布を算出する画像解析手段と、
を備えることを特徴とする画像解析型の粒度分布測定装置。 An apparatus for measuring a particle size distribution based on a particle image of a plurality of particles in a liquid,
A light-transmitting open channel member having a flat inclined surface,
Irradiating means for irradiating light toward a plurality of particles in the liquid flowing on the inclined surface,
Imaging means for continuously imaging a plurality of particles in the liquid over the inclined surface from a position on the opposite side to the irradiation unit when viewed from the inclined surface,
Image analysis means for calculating a particle size distribution by calculating a value representing the size of each particle based on the particle image obtained from the imaging means, and integrating the values obtained from the plurality of particle images ,
An image analysis type particle size distribution measuring device, comprising:
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