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    • 4. 发明专利
    • DIFFERENTIAL TYPE MEASURING DEVICE FOR DEGREE OF ELECTRICAL MOVEMENT
    • JPH11264790A
    • 1999-09-28
    • JP6742198
    • 1998-03-17
    • RIKAGAKU KENKYUSHO
    • TAKEUCHI KAZUOISOMURA SHOHEIHIRASAWA SEIICHIOKUYAMA KIKUO
    • G01N27/60G01N15/02
    • PROBLEM TO BE SOLVED: To provide a differential type measuring device for the degree of electrical movement, whereby it is possible to accurately measure the size of particulate under the low pressure condition. SOLUTION: Charged particles drawn in from one slit 4 move downward along the center axis together with a sheath gas supplied from a discharge hole 7 in an enclosure 2, and each particulate is drawn toward a center rod 3 from the side with the enclosure 2 at a speed complying with the degree of electrical movement upon being influenced by the electric field generated by a voltage V impressed by a variable voltage source 10 between the inside circumferential surface of the enclosure 2 and the peripheral surface of the center rod 3. Only those particulates having specified size are taken out, which have advanced for the distance L in drawing the specified locus and reached the other slit 5 in the center rod 3. The sheath gas supplied from a draw-in hole 7 in the enclosure 2 is exhausted from the discharge hole 9 in the enclosure 2 upon passing through the slit 5, but because an orifice 11 is provided in the downstream of the slit 5, the sheath gas is hindered from flowing, and a pressure difference is generated between in front of and behind the orifice 11.
    • 8. 发明专利
    • LASER IRRADIATION IN LASER ISOTOPE SEPARATION METHOD
    • JPS63242326A
    • 1988-10-07
    • JP7817987
    • 1987-03-31
    • RIKAGAKU KENKYUSHO
    • TAKEUCHI KAZUOOYAMA TOSHIYUKI
    • B01D59/34
    • PURPOSE:To sufficiently utilize the benefit obtained by the use of an ultrasonic nozzle and to prevent the damage of an optical window, by allowing two or more kinds of laser beams different in a wavelength irradiating a working substance to cross each other. CONSTITUTION:Two kinds of infrared laser beams 2, 3 different in a wavelength are allowed to irradiate the working substance in an ultrasonic nozzle 1 in such a state that the optical axes thereof cross each other at a right angle. The overlapped part of the laser beams 2, 3 is limited to the central part of the nozzle 2 and no dissociation reaction is induced in the vicinity of the inside part of optical windows 4, 4' permitting the transmission of the laser beams 2, 3. As a result, since no infrared multiple photo dissociation is induced in the gaseous working substance not supercooled in the vicinity of the inner wall of the ultrasonic nozzle 1 or low pressure reaction container 7, the benefit obtained by the use of the ultrasonic nozzle 1 can be sufficiently obtained. Further, since it is avoided that highly intensity infrared laser beam is applied to the optical windows 4, 4', the damage of the optical windows 4, 4' can be prevented.