Reference scatter for use in the correction of scattering photometers

• US 4,291,981 A
• Filed: 03/23/1979
• Issued: 09/29/1981
• Est. Priority Date: 04/05/1978
• Status: Expired due to Term

• Current Assignee: Kabushiki Kaisha Kyoto Daiichi Kagaku
• Original Assignee: Kabushiki Kaisha Kyoto Daiichi Kagaku
• Inventors: Saito, Akio, Ohnishi, Masaaki
• Primary Examiner(s): Corbin, John K.
• Assistant Examiner(s): ARNOLD, BRUCE
• Application Number:
  US06/023,407
• Time in Patent Office: 921 Days
• Field of Search: 250/252, 350/61, 350/65, 350/67, 350/188, 356/243, 356/256, 356/230, 356/42, 356/445-448, 356/244
• US Class Current: 356/244
• CPC Class Codes: G01N 21/4785 Standardising light scatter apparatus; Standards therefor

Abstract

A reference scatterer for use in the correction of scattering type photometers having a reference glass scatterer main body with microcrystals therein to split the phase of incident light which is housed within a vessel with a clearance between the two. The clearance is filled with a liquid whose index of refraction substantially matches that of the main body.

Claims

1. A reference scatterer for use in the correction of scattering photometers comprising:

a reference glass scatterer main body containing microcrystals for phase splitting incident light;

a transparent vessel;

a cap for said transparent vessel having means for coupling said reference glass scatter main body to said transparent vessel with a clearance between said body and said vessel;

said body placed within said vessel with a clearance therebetween, and a liquid which fills the clearance and is prevented from leaking out of the transparent vessel by said cap.

2. A reference scatterer as in claim 1 wherein said liquid comprises silicone oil.

3. A reference scatterer as in either of claims 1 or 2 wherein said reference glass scatterer main body is formed in the shape of a column and said transparent vessel is tubular and of a complementary shape to the main body and having a closed bottom and an open top end, the inner diameter of said vessel being larger than the outer diameter of said reference glass scatterer main body.

4. A reference scatterer as in claim 3, wherein the bottom of said reference glass scatterer main body and the base of said transparent vessel are each formed with a respective curved surface to form a lens for incident light.

5. A reference scatterer as in claim 3, wherein the bottom of said reference glass main body and the base of said transparent vessel are each formed with a respective plane surface.

6. A reference scatterer as in claim 3 wherein the column shape of said reference glass scatterer main body is generally cylindrical.

7. A reference scatterer as in claim 6 where the bottom of said reference glass scatterer main body and the base of said vessel are each formed with respective curved surface to form a condensing lens for incident light.

8. A reference scatterer as in claim 2 wherein the column shape of said reference glass scatterer main body has at least one flat side.

9. A reference scatterer as in claim 8 where the bottom of said reference glass scatterer main body and the base of said vessel are each formed generally flat.

10. A reference scatterer as in claim 1 wherein microcrystals are of grown borosilicic acid.

11. A reference scatterer as in claim 3 wherein said reference glass scatterer main body has a portion which extends above the open end of said transparent vessel, said cap having a stepped recess having one part for fitting over said extending portion of said reference glass scatterer main body and a second part for engaging the outer surface of said transparent vessel adjacent said open end thereof to seal said vessel.