Calibrating reflector device for an optical measuring system

• US 5,305,744 A
• Filed: 03/17/1993
• Issued: 04/26/1994
• Est. Priority Date: 03/18/1992
• Status: Expired due to Term

• Current Assignee: Pulsion Medical Systems AG
• Original Assignee: Reinhold Knoll, Ulrich Pfeiffer
• Inventors: Knoll, Reinhold, Pfeiffer, Ulrich
• Primary Examiner(s): Sykes, Angela D.
• Application Number:
  US08/032,862
• Time in Patent Office: 405 Days
• Field of Search: 128/633-635, 128/664-667, 356/39-41, 356/243
• US Class Current: 600/342
• CPC Class Codes: A61B 2560/0233 Optical standards
• CPC Class Codes: A61B 5/1459 invasive, e.g. introduced into the body by a catheter A61B5/1464 takes precedence
• CPC Class Codes: A61B 5/1495 Calibrating or testing of in-vivo probes
• CPC Class Codes: G01M 11/30 Testing of optical devices, constituted by fibre optics or optical waveguides
• CPC Class Codes: G01N 21/4785 Standardising light scatter apparatus; Standards therefor
• CPC Class Codes: G01N 21/7703 using reagent-clad optical fibres or optical waveguides using measurement of total internal reflection or attenuated total reflection G01N21/552; optical fibres or waveguides per se G02B
• CPC Class Codes: G01N 2201/066 Modifiable path; multiple paths in one sample
• CPC Class Codes: G01N 2201/084 Fibres for remote transmission

Abstract

Calibrating reflector device to calibrate an optical measuring system having an optical fiber optics probe, for example, for measuring the oxygen saturation of blood. The calibrating reflector device comprises a housing that is open on one end, a reflecting device in the form of an opaque layer in which reflecting particles are embedded, as well as a positioning plug with a central bore, in which the fiber optics probe can be received with a certain frictional resistance. A transparent layer is disposed between the front end of fiber optics probe and the reflecting layer, on whose surface the front end of fiber optics probe can be arranged by the positioning plug.

Claims

1. Calibrating reflector device, for an optical measuring system which has an optical fiber optics probe, the reflector device comprising a housing that is open at one end, a reflecting device in said housing, said reflecting device having a specific reflection behavior and a positioning device which positions a front end of a fiber optics probe of an optical measuring system in the housing of the reflector device;

wherein a transparent layer is placed adjacent the reflecting device in a manner causing the front end of a fiber optics probe to be positioned in the housing, by said positioning device, adjoining the transparent layer.

2. Calibrating reflector device according to claim 1, wherein the reflecting device comprises a reflecting layer which contains reflecting particles.

3. Calibrating reflector device according to claim 2, wherein the reflecting layer is placed on the transparent layer.

4. Calibrating reflector device according to claim 1, wherein the reflecting device comprises a front surface of an inner wall of the housing in which reflecting particles are embedded.

5. Calibrating reflector device according to claim 1, wherein a surface of the transparent layer abuts the reflecting device in a manner creating a rough, partially reflecting interface therebetween;

and wherein the reflecting device comprises an opaque layer with a lower index of refraction than said interface.

6. Calibrating reflector device according to claim 1, wherein the positioning device comprises an elastic plug which has a central opening extending axially therethrough for frictionally retaining the fiber optics probe therein.

7. Calibrating reflector device according to claim 6, wherein the reflecting device comprises a reflecting layer which contains reflecting particles.

8. Calibrating reflector device according to claim 7, wherein the reflecting layer is placed on the transparent layer.

9. Calibrating reflector device according to claim 6, wherein the reflecting device comprises a front surface of an inner wall of the housing in which reflecting particles are embedded.

10. Calibrating reflector device according to claim 6, wherein a surface of the transparent layer abuts the reflecting device in a manner creating a rough, partially reflecting interface therebetween;

and wherein the reflecting device comprises an opaque layer with a lower index of refraction than said interface.

11. Calibrating reflector device according to claim 6, wherein said elastic plug has limiting means on an outer side thereof for positioning the elastic plug in said housing.

12. Calibrating reflector device according to claim 11, wherein the reflecting device comprises a reflecting layer which contains reflecting particles.

13. Calibrating reflector device according to claim 12, wherein the reflecting layer is placed on the transparent layer.

14. Calibrating reflector device according to claim 11, wherein the reflecting device comprises a front surface of an inner wall of the housing in which reflecting particles are embedded.

15. Calibrating reflector device according to claim 11, wherein a surface of the transparent layer abuts the reflecting device in a manner creating a rough, partially reflecting interface therebetween;

and wherein the reflecting device comprises an opaque layer with a lower index of refraction than said interface.

16. Calibrating reflector device according to claim 1, wherein said reflecting layer comprises an opaque disk.

17. Calibrating reflector device according to claim 1, wherein said transparent layer comprises a disk of transparent material.

18. Calibrating reflector device according to claim 17, wherein said reflecting layer comprises an opaque disk in abutting relationship with said disk of transparent material, both of said disks being loosely received in said housing.

19. Calibrating reflector device according to claim 18, wherein said positioning device comprises an elastic plug which has a central opening extending axially therethrough for frictionally retaining the fiber optics probe therein.

20. Calibrating reflector device, for an optical measuring system which has an optical fiber optics probe, the reflector device comprising a housing which is open at one end, a reflecting device in said housing, said reflecting device having a specific reflection behavior and a positioning device which positions a front end of a fiber optics probe of an optical measuring system in the housing of the reflector device;

wherein a transparent layer is provided in juxtaposition to the reflecting device in said housing, said transparent layer being disposed between the reflecting device and the open end of the housing and forming an abutment means for properly positioning the front end of a fiber optics probe relative to the reflecting device by engagement of said front end on said transparent layer when the optics probe is positioned in the housing by said positioning device.