Apparatus for measuring particles in liquid

• US 4,876,458 A
• Filed: 09/29/1988
• Issued: 10/24/1989
• Est. Priority Date: 10/02/1987
• Status: Expired due to Fees

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Honma, Noriaki, Munakata, Chusuke, Ito, Yoshitoshi, Takeda, Kazuo
• Primary Examiner(s): Nelms, David C.
• Application Number:
  US07/250,615
• Time in Patent Office: 390 Days
• Field of Search: 250/573, 250/574, 250/575, 356/336, 356/338, 356/339, 356/340, 356/341, 356/342, 356/343
• US Class Current: 250/574
• CPC Class Codes: G01N 15/1459 the analysis being performed on a sample stream
• CPC Class Codes: G01N 21/53 within a flowing fluid, e.g. smoke

Abstract

An apparatus for measuring particles in a liquid, with the apparatus including an arrangement for allowing a sample liquid to flow out from a nozzle into a gas in a stream, an arrangement for radiating light into the sample liquid stream coaxially with the axis of the stream, and an arrangement for collecting ways of light scattered by particles contained in the sample liquid stream at a point outside and by a side of the sample liquid stream and then detecting the collective light rays.

Claims

1. An apparatus for measuring particles in a liquid the apparatus comprising:

a sample liquid supply means for allowing the sample liquid to flow out from a nozzle into a gas in a stream;

a light radiation means for radiating light into an sample liquid stream coaxially with the axis of the stream; and

a scattering light detection means for collecting rays of light scattered by particles contained in a sample liquid stream at a point outside and by the side of the sample liquid stream and then detecting the collected light rays.

2. An apparatus for measuring particles in liquid as set forth in claim 1, wherein the sample liquid supply means includes a sample liquid supply tube, a nozzle provided at one end of the sample liquid supply pipe, and a sample liquid recovery tube located opposite to the nozzle with a gap therebetween.

3. An apparatus for measuring particles in liquid as set forth in claim 2, wherein the sample liquid recovery tube traps the radiated light.

4. An apparatus for measuring particles in liquid as set forth in claim 1, wherein the light radiation means includes a light source and an optical fiber means for conducting light from the light source.

5. The apparatus for measuring particles in liquid as set forth in claim 1, wherein the light radiation means includes a optical fiber means, and a front end of the optical fiber means is located so that light emitted from the optical fiber means will not strike and inner wall of the nozzle.

6. An apparatus for measuring particles in liquid as set forth in claim 5, wherein the front end of the optical fiber means projects out of the end of the nozzle.

7. An apparatus for measuring particles in liquid is set forth in claim 2, wherein a transparent tube encloses and outer circumference of the sample liquid stream, extending from a lower end of the nozzle to and upper end of the sample liquid recovery tube.