JPS63302342A - Instrument for measuring configuration of particle in gas - Google Patents

Abstract

PURPOSE:To enable the configurations of particles in a gas to be continuously measured by revolving the polarized nonspherical particles in a revolving electric field and detecting a sound wave generated at this time by a highly sensitive microphone. CONSTITUTION:The inner pipe 2 of a specimen introducing pipe 1 is connected to a duct for a gas to be measured. When a suction unit 7 is operated, the gas to be measured and the filtered clean gas are sucked-in from the distal end of the inner pipe 2 and the conduit pipe 3' of an outer pipe 3, respectively, by a suction pump 8 and the gas to be measured flows into an analyzing chamber 4. A high voltage with a positive polarity and a high voltage with a negative polarity are applied to two electrodes 5 respectively opposing to each other via a revolving electric field generator 6 in the analyzing chamber 4. Particles in the gas to be measured flowing into the analyzing chamber 4 are polarized such that each particle attracts another particle having a reverse polarity when the gas flows into the chamber 4. Since the polarity of each particle is changed to that of the adjacent particle at the next moment, the polarized particle changes an angle by being affected by the adjacent particle and then further changes the angle. Thus, the particles are revolved and generates a sound wave. The sound wave is caught by a microphone 10 and analyzed by a waveform analyzer 12 to obtain the configurations of the particles.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an apparatus for electrically measuring the shape of non-spherical particles in a gas.

[Conventional technology]

Various types of particle measuring devices have been known in the past, but a particle shape measuring device that utilizes a rotating electric field, such as the one according to the present invention, is not known.

When measuring particles, it is often necessary to measure the shape of the particles from the viewpoint of detecting asbestos (quartz) fiber pieces, etc., but no such device has been proposed so far.

〔the purpose〕

An object of the present invention is to provide an apparatus that can continuously measure the shape of particles in a gas.

〔composition〕

According to the present invention, there is provided a sample introduction tube consisting of an inner and outer double tube for inhaling the sample gas to be measured wrapped in clean gas, and an analysis in which a large number of electrodes are arranged on the inner surface of the straight tube, dividing the circumference equally. The chamber and the suction pump are sequentially connected, and a detection mechanism consisting of a microphone and a waveform analyzer and a particle measuring device connected to the microphone is attached to the side of the analysis chamber, and each of the electrodes is connected to the opposite position of the electrodes. The shape of particles in a gas is obtained by connecting a set of two of them to a rotating electric field generator that applies rotation to the particles by sequentially applying a high voltage to the positive electrode and a high voltage to the negative electrode. An apparatus for measuring is provided.

[Embodiments of the invention]

An embodiment of the present invention will be described with reference to the drawings. The entire structure includes a straight cylindrical sample introduction tube 1, an analysis chamber 4, and a suction section 7, which are arranged with their front and rear ends facing each other in sequence, and the detection is carried out on the outer surface of the analysis chamber 4. It is formed by adding a mechanism 9.

The sample introduction tube 1 is a double tube consisting of an inner tube 2 into which a sample gas, that is, a gas containing the required particles to be measured, is fed, and an outer tube 3 surrounding the inner tube 2 through which a clean gas passes. It is made.

The analysis chamber 4 is formed into a cylindrical shape in which a large number of rod-shaped electrodes 5 are arranged in parallel at equal positions on the circumference in a straight tube, and a sample gas passes through the inside. These electrodes are formed of a plurality of pairs, with two electrodes facing each other across the center of the cylinder as a positive and negative pair. A high voltage of the positive electrode is applied to one of the electrodes, and a high voltage of the negative electrode is applied to the other, and in response to the operation of the rotary switch mechanism by the segments and brushes of the rotating electric field generator 6, the above application is applied to the first set of electrodes. The electrodes then change from one set of electrodes to the next adjacent set of electrodes.

The suction unit 7 includes a suction pump 8 connected to the other end of the analysis chamber 4.
Equipped with a flow meter, filter, etc.

The detection mechanism 9 includes a highly sensitive microphone 10 on the side of the analysis chamber 4 and a waveform analyzer 11 connected to this microphone.
and a particle measuring device 12.

[action, effect]

This invention provides the above-mentioned groove bottom, and the inner tube 2 of the sample introduction tube 1.
When connected to the measuring gas duct and actuating the suction unit 7, the suction pump 8 pumps the tip of the inner tube 2 and the conduit 3 of the outer tube 3.
A measuring gas and a filtered clean gas are respectively sucked from the analyzer chamber 4', and the measuring gas is forcibly sucked by the drawing action of the clean gas and flows into the analysis chamber 4' in a straight line.

In the analysis chamber 4, as described above, a high voltage of the positive electrode and a high voltage of the negative electrode are applied to the two opposing electrodes 5, 5 via the rotating electric field generator 6, and this application is applied to the adjacent electrodes one after another. Because the particles in the 4Ij constant gas, which is surrounded by clean gas and flows into the analysis chamber 4, are polarized so as to attract each other to the electrodes formed on the positive and negative electrodes when they flow in. However, in the next moment, the positive and negative sides of the electrode change to the adjacent electrode, so the polarized particle is pulled by the adjacent electrode and changes its angle, and then changes its angle again, and in this way, the particle rotates and its Sound waves are generated in response to rotational kinetic energy. Therefore, by capturing this sound wave with the microphone 10 and analyzing it with the waveform analyzer 12, the shape of the particle can be determined. That is, a single polarized non-spherical particle is rotated in a rotating electric field, but at this time,
By detecting the generated sound waves with a high-sensitivity microphone and analyzing their waveforms, particle shapes can be determined. For example, the number of particles, i.e., the wave number, determines the number of particles, the wave height determines the major axis of the particle, the electric field transit time determines the aerodynamic diameter or air resistance of the particle, and from all data, the minor axis of the particle can also be determined. It will be possible.

[Brief explanation of drawings]

The drawing is an explanatory perspective view of the present invention. 1...Sample introduction tube, 2...Inner tube, 3...Outer tube, 4
... Analysis room, 5... Electrode, 6... Rotating electric field generator, 7... Suction part, 9... Detection mechanism, 10... Microphone, 11... Waveform analysis device, 12 ...Particle measuring device. Patent Applicant Kozo Iizuka, Director General of the Agency of Industrial Science and Technology Designated Agent Etsu Nakamura, Director, Pollution Resources Research Institute, Agency of Industrial Science and Technology 1962 Patent Application No. 138016 2, Title of Invention Device for Measuring the Shape of Particles in Gas 3, Relationship with the Amendment Case Patent Applicant Address 5 Kasumi, Chiyoda-ku, Tokyo! ! 1-3-1 Name (114) Director of the Agency of Industrial Science and Technology Kozo Iizuka 44,
Designated representative 〒151 1=lower ltodo・p′±1′j,”−−7゜1(1,1 −F・i'iBt'u′) Par 12 2', 2s. 9th 7. Contents of amendment The following amendments will be made to the specification and drawings: (1) "Drawing" on page 6, line 4 of the specification will be corrected to "Figure 1." (2) The drawing will be corrected as shown in the attached sheet.

Claims (1)

[Claims] (1) A sample introduction tube consisting of an inner and outer double tube that inhales the sample gas to be measured wrapped in clean gas, and an analysis chamber in which a large number of electrodes are arranged on the inner surface of the straight tube, dividing the circumference equally. The suction pumps are successively connected, and a detection mechanism consisting of a microphone and a waveform analyzer and a particle measuring device connected to the microphone is attached to the side of the analysis chamber, and each of the electrodes is connected to two A device for measuring the shape of particles in a gas, in which only one set of particles is connected to a rotating electric field generator that sequentially applies a high voltage to the positive electrode and a high voltage to the negative electrode.