Cover layer for optical ion sensors

• US 5,091,800 A
• Filed: 07/08/1988
• Issued: 02/25/1992
• Est. Priority Date: 07/20/1987
• Status: Expired due to Fees

• Current Assignee: AVL AG
• Original Assignee: AVL AG
• Inventors: Schwarzenegger, Erna, Offenbacher, Helmut
• Primary Examiner(s): Arnold, Bruce Y.
• Assistant Examiner(s): SHAFER, RICKY D
• Application Number:
  US07/216,546
• Time in Patent Office: 1,327 Days
• Field of Search: 350/1.7, 350/316, 350/319, 350/321, 435/808, 435/817, 430/4, 430/939, 356/38, 356/39, 356/412, 436/163, 436/172, 128/634, 128/636, 210/500.25, 210/500.3, 210/500.43, 210/505, 204/98, 250/462.1, 73/36
• US Class Current: 359/350
• CPC Class Codes: G01N 2021/0385 Diffusing membrane; Semipermeable membrane
• CPC Class Codes: G01N 2021/6434 Optrodes
• CPC Class Codes: G01N 2021/775 Indicator and selective membrane
• CPC Class Codes: G01N 21/6428 Measuring fluorescence of fluorescent products of reactions or of fluorochrome labelled reactive substances, e.g. measuring quenching effects, using measuring "optrodes" in vivo A61B5/00; immunoassay G01N33/53
• CPC Class Codes: G01N 21/77 by observing the effect on a chemical indicator
• 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 21/80 Indicating pH value
• CPC Class Codes: Y10S 435/808 Optical sensing apparatus

Abstract

In order to eliminate interferences of an optical or chemical nature, preferably in optical sensors, a cover layer is provided which comprises a hydrophilic, ion-permeable polymer membrane containing precious metal pigments deposited by a reduction or reduction/cementation technique for the purpose of suppressing straylight.

Claims

1. An optical ion sensor having a cover layer for suppressing stray light, said cover layer comprising a hydrophilic, ion-permeable, polymer membrane, having at least one of the following properties:

high molecular weight, cross linkages and being in a partly crystalline state, said polymer membrane containing pigments of precious metals from the group consisting of Ag, Au and Pt which are embedded in colloidal distribution and precipitated by reduction techniques.

2. A optical ion sensor according to claim 1, wherein said hydrophilic, ion-permeable polymer membrane is made of regenerated cellulose.

3. A optical ion sensor according to claim 1, wherein said hydrophylic, ion-permeable polymer membrane is made of a cross-linked polyvinyl alcohol.

4. A optical ion sensor according to claim 1, wherein said hydrophilic, ion-permeable polymer membrane is made of a cross-linked stretched polyvinyl alcohol.

5. An optical ion sensor having a cover layer for suppressing stray light, said cover layer comprising a hydrophilic, ion-permeable, polymer membrane, having at least one of the following properties:

high molecular weight, cross linkages and being in a partly crystalline state, said polymer membrane containing pigments of precious metals from the group consisting of Ag, Au and Pt, which are embedded in colloidal distribution and precipitated by reduction techniques followed by cementation techniques.

6. An optical ion sensor as claimed in claim 5, wherein said hydrophilic, ion-permeable polymer membrane is made of regenerated cellulose.

7. An optical ion sensor as claimed in claim 5, wherein said hydrophilic, ion-permeable polymer membrane is made of a cross-linked polyvinyl alcohol.

8. An optical ion sensor as claimed in claim 5, wherein said hydrophilic, ion-permeable polymer membrane is made of a cross-linked stretched polyvinyl alcohol.