JPH05322740A - Analyzed for fiberlike particle in liquid - Google Patents

Abstract

PURPOSE:To measure the length and diameter of a particle by passing fibrelike particles dispersed in a liquid through a minute pipe whose inlet and outlet are different in diameter, making the axes of the particles parallel with the main axis of the pipe, and detecting the scattering light of a particle. CONSTITUTION:Liquid where fiberlike particles 1 drift enters through an inlet 2 and gets out through an outlet 3 by a method in which pressure is added from the side of the inlet 2 or suction is conducted from the side of the outlet 3. As the diameter of the inlet 2 of this pipe is larger than that of the outlet 3, a pipe axis and that of a particle 1 become parallel with each other according as a particle 1 heads for the outlet 3 from the inlet 2. When the particles 1 is irradiated with light 4 whose the thickness of light passage is thin, a light scattering phenomenon is generated by a particle 1'' during a time that is from irradiation start at the tip of the particle 1'' to moving to the end. This scattering light is detected by means of a detector 5. The length of a particle 1 is calculated from a time detecting the scattering light and the movement speed of the particle 1. The diameter of a particle 1 is sought from the intensity of scattering on the basis of the theory of light scattering. As the thickness of the light 4 has relationship with resolving power, the thinner it is, the better it is.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for measuring the diameter and length of fibrous particles suspended in a liquid.

[0002]

2. Description of the Related Art Regarding the method for measuring the size of fibrous particles suspended in a gas, the conventional method is that the fibrous particles are collected on a filter or a transparent glass plate and the direct measurement with a microscope is the simplest. However, there is a problem in that it requires a lot of labor. Although there is an automatic measurement method in the state where the fibrous particles are suspended in the gas on the commercial scale, there is no automatic measurement method for the fibrous particles in the liquid.

[0003]

In order to measure the length of a fibrous particle, it is possible to know the shape of the fibrous particle by combining a technique of adjusting the principal axis of the fibrous particle in a certain direction and a method of measuring the diameter. Can be done.

[0004]

The shape of the fibrous particles can be represented by two elements of diameter and length by simplifying the shape of a cylinder. In order to measure the length, it is advantageous for the measurement that the principal axes of the particles are aligned in a certain direction in the detector. Therefore, when particles move in a fine tube, the main axis of the particle and the main axis of the tube are parallel to each other to measure the length.

Further, the diameter of the fibrous particles can be measured by analyzing the scattered light by the fibrous particles of the light irradiated to detect the length.

[0006]

【Example】

1 shows an inlet 12 to an outlet 13 of a graded pipe as shown in FIG.
A brief explanation will be given of the movement of the main axis of the particle during the period. Particles 7 whose main axis direction is different from the tube axis move toward the inlet along the streamline, and are arranged like particles 8. Furthermore, the pressure balance exerted on both ends of the particle is broken, moving to 9 and 10,
In the vicinity of the outlet 13, the main axis and the tube axis are always parallel, like the particles 11. By doing so, the main axes of the particles 7 in the liquid were in different directions, but as the direction from the inlet to the outlet became parallel to that of the tube axis, the particles moved in the tube and moved toward the outlet.

[0007]

FIG. 2 shows an outline of a detection unit of this device. The fibrous particles are suspended in the liquid, and the liquid enters from the inlet and exits from the outlet by a method of applying pressure from the inlet 2 side or sucking from the outlet 3 side in the figure. The diameter of the pipe on the inlet side is larger than the diameter on the outlet side, and the liquid moves to the outlet without flowing and flows.

In the detection method, when light 4 having a small thickness is irradiated over the entire cross section of the microtube, a light scattering phenomenon occurs due to the particles 1 "during the time when the particles 1" start to be irradiated from the tip to the end. If the position of the light source 6 is fixed and the particle 1 ″ is long, the light scattered by the particle can continue for a long time.
The scattered light scattered by the particles is detected by a photomultiplier tube 5 which is a detector. This detector detects scattered light as it travels from the moment the tip of the particle begins to be illuminated by the light beam 4 to the end of the particle.

The length (L) of the fibrous particles can be easily calculated from the time (t) for detecting the scattered light by the particles and the moving speed (v) of the fibrous particles as shown in the following equation.

[Equation 1]

L = v.t

The diameter of the particles can be determined from the scattering intensity based on the light scattering theory. Alternatively, if the relationship between the diameter and the scattering intensity is calibrated with fibrous particles of known particle size, the diameter of particle 1 ″ can be immediately obtained. Since the thickness of light 4 is related to resolution, it is as thin as possible. Better.

[0012]

According to the present invention, it requires a great deal of labor and time to collect fibrous particles floating in a liquid on a filter or a glass plate and measure the size and length with a microscope. No, it can be measured automatically.

[Brief description of drawings]

FIG. 1 is an explanatory view schematically showing how fibrous particles in a liquid move in a fine tube.

[Fig. 2] Fig. 2 shows a detector of the present apparatus.

1. It is an explanatory view showing an outline of [1].

FIG. 3 shows a detection unit of the device.

2. FIG. 2 is an explanatory diagram showing an outline of the above.

FIG. 4 is a front view of a detection unit of the present device.

[Explanation of symbols]

 1,1 ', 1 "Fibrous particles 2 Micro tube inlet 3 Micro tube outlet 4 Light 5 Detector (photomultiplier tube) 6 Light source 7,8,9,10,11 Fibrous particles 12 Gradient tube inlet 13 Gradient tube outlet

Claims (2)

[Claims] 1. A diameter of a fibrous (cylindrical) particle dispersed in a liquid, comprising a fine tube having different inlet and outlet diameters, and a light source for generating a light beam of a minute width, a photodetector and a signal processor at the outlet thereof. In order to measure the length and the length, the detector detects the scattered light of the particle irradiated by the light beam, and the signal processor measures the length of the fibrous particle from the time when the scattered light is detected, Device for measuring height 2. A fibrous particle analyzer in liquid according to claim 1, wherein the set of the light beam and the detector is provided in the middle of the fine tube.