公开(公告)号：JP2002310885A

公开(公告)日：2002-10-23

申请号：JP2001109440

申请日：2001-04-09

Applicant: TONICHI COMP APPLIC KK ,  POWREX KK

Inventor： TAKAHASHI TADASHI ,  NATSUYAMA SUSUMU ,  NAGATSUMA KENJI ,  MORITA TAKAYUKI

IPC: G01N15/02

Abstract: PROBLEM TO BE SOLVED: To provide a particle size distribution measuring device capable of alternately carrying out automatic focus control and particle size distribution measurement in short time intervals and continuing the particle size distribution measurement more continuously without interruptions. SOLUTION: The particle size distribution measuring device is provided with shading transparent glasses 3a and 3b arranged in laser beam transmission lines in a pair of opposing measurement heads 2a and 2b, an open transmission line 64 provided between both measurement heads and provided with openings 66a and 66b for intrusion of powder and grain 20 from outside, an air flow generating means 23a blowing air on shading transparent glass surfaces, a condensing lens 56 condensing a laser beam, a light receiving sensor 21 receiving the laser beam, an automatic focusing mechanism 11 adjusting a center of the light receiving sensor so it is positioned in a focal point 24 of the laser beam, a shutter 70 opening and closing the openings, and an air flow adjusting means adjusting blowing of the air from the air flow generating means. During operation of the automatic focusing mechanism, the shutter is closed and the air is blown at maximum.

公开(公告)号：JP2001281127A

公开(公告)日：2001-10-10

申请号：JP2000098408

申请日：2000-03-31

Applicant: TONICHI COMP APPLIC KK

Inventor： TAKAHASHI TADASHI

IPC: G01N15/02

Abstract: PROBLEM TO BE SOLVED: To provide a particle size distribution measuring device having a compact-size measuring part. SOLUTION: This particle size distribution measuring device 1 has a formation in which scattered light S generated by irradiating particles to be measured 10 existing in a measuring space X with a laser beam P1 emitted from a laser beam source 2 is converged by a light-receiving sensor 7 formed by arranging concentrically plural sensors T comprising photoelectric conversion elements; a light intensity distribution signal corresponding to a scattering angle θ of scattered light S is processed by a signal processing part 8 connected to the light-receiving sensor 7; and a particle size distribution is calculated by an analysis part 9. In the device, the measuring space X is formed between a lens 5 arranged in front of the laser beam source 2 and a reflecting mirror 6 arranged oppositely to the lens 5, and the particles to be measured 10 is irradiated with at least either of an incident measuring beam M1 formed from the laser beam P1 converted into a parallel beam and entering the measuring space X and a reflected measuring beam M2 formed from the incident measuring beam M1 reflected by the reflecting mirror 6 and returning to the lens 5 side, to thereby form scattered light S.

公开(公告)号：JP2002340780A

公开(公告)日：2002-11-27

申请号：JP2001146764

申请日：2001-05-16

Applicant: TONICHI COMP APPLIC KK

Inventor： TAKAHASHI TADASHI ,  ABE OSAMU

IPC: G01N15/02 ,  G01N15/14

Abstract: PROBLEM TO BE SOLVED: To provide a particle size distribution measuring apparatus in which the measuring range can be shifted, as required, to the small diameter side or the large diameter side while keeping sufficient resolution and accuracy without increasing the number of photoelectric conversion elements of the light receiving sensor in the particle size distribution measuring apparatus. SOLUTION: The analyzing section of the particle size distribution measuring apparatus is set with an initial measurement range having continuous particle size sections of the same number m as the photoelectric conversion elements of a light receiving sensor, a range where the initial measurement range is shifted by a specified number of particle size sections to the small diameter side, and a range where the initial measurement range is shifted by a specified number of particle size sections to the large diameter side, and stores a coefficient matrix T0 for calculating the probability density vector W0 corresponding to the initial measurement range from an actually measured scattering energy vector E, a coefficient matrix T1 for calculating the probability density vector W1 corresponding to the small diameter shift range from the actually measured scattering energy vector E, and a coefficient matrix T2 for calculating the probability density vector W2 corresponding to the large diameter shift range from the actually measured scattering energy vector E.

公开(公告)号：JP2001141639A

公开(公告)日：2001-05-25

申请号：JP32497399

申请日：1999-11-16

Applicant: NAT AEROSPACE LAB ,  TONICHI COMP APPLIC KK

Inventor： HAYASHI SHIGERU ,  TAKAHASHI TADASHI

IPC: G01N15/02 ,  G01N15/14

Abstract: PROBLEM TO BE SOLVED: To accurately measure the particle diameter distribution of a group of particles by adopting an analysis part storing the shifting procedures of a particle diameter section and the subdivision procedures of a particle diameter division. SOLUTION: An initial particle diameter section S1 that is composed of continuous particle diameter sections T is set, whose number is equal to or less than the number of photo detectors where the minimum and maximum particle diameters are set to lower and upper limits, respectively. When the probability density of each of the particle diameter sections T is obtained so that a prediction scattering energy vector for the probability density coincides with an actually measured scattering energy vector to the maximum within a range where the probability density of the particle diameter section T does not become negative. Hence when either probability density out of the maximum particle diameter section Tmax and the minimum particle section Tmin exceeds a specific value, the particle diameter distribution of the group of particles is obtained based on new particle diameter sections S2, S3,... being obtained by shifting the particle diameter section where the prediction scattering energy vector coincides with the actually measured scattering energy vector to the maximum to large and small particle diameter sides when the probability density of the maximum particle diameter section and that of the minimum particle diameter section exceed specific values, respectively, by one particle diameter section. The calculation procedure is stored in the analysis part is advance.

公开(公告)号：JP2002022643A

公开(公告)日：2002-01-23

申请号：JP2000203412

申请日：2000-07-05

Applicant: TONICHI COMP APPLIC KK

Inventor： TAKAHASHI TADASHI

IPC: G01N15/02 ,  G01N1/00 ,  G01N1/02

Abstract: PROBLEM TO BE SOLVED: To provide a particle size distribution-measuring apparatus having a measurement efficiency improved by positively sucking and feeding particles to be measured to a measurement space. SOLUTION: A scattering light Pm generated by irradiation with a laser light P emitted from a laser light source 4 to the particles G to be measured in the measurement space 701 is received by a light-receiving sensor 9. A light intensity distribution signal corresponding to a scattering angle θ of the scattering light Pm is processed by a signal-processing part 10 connected to the light- receiving sensor 9. Thereafter, the particle size distribution is calculated at an analyzing part 11. In the technique of measuring the particle size distribution, the particles G to be measured are sucked by an air flow rate amplifier 14 and introduced to the measurement space 701.