Optical system

Patent metadata

Field	Value
Publication number	US-10520428-B2
Application number	US-201816031278-A
Country	US
Kind code	B2
Filing date	Jul 10, 2018
Priority date	Jul 12, 2017
Publication date	Dec 31, 2019
Grant date	Dec 31, 2019

Abstract

The invention relates to an optical system for measuring the absorption of light in a medium, comprising at least one light source for sending light and at least one optical detector, which receives the light and converts it into an electrical signal. The system is characterized in that the system comprises at least one light guide, wherein, in the region of the light source, light is coupled as reference light into the light guide, wherein the light guide is guided, at least in sections, past the medium, and wherein the light guide guides the reference light onto the detector.

First claim

What is claimed is:

1. An optical system for measuring the absorption of light in a medium, comprising:
a cuvette embodied to contain the medium;
a light source for sending light, wherein the light source is configured to radiate light as measurement light into the medium in the cuvette;
an optical detector embodied to receive the light and to convert the received light into an electrical signal;
a first light guide, wherein, in the region of the light source, the first light guide is embodied to couple light as reference light into the first light guide and to guide the reference light past the cuvette and onto the optical detector; and
a light selector configured to switch the light of the light source between measurement light and reference light, wherein the light selector is disposed between the light source and the cuvette and also between the light source and the first light guide,
wherein the first light guide is further embodied to guide the measurement light onto the detector after absorption in the medium in the cuvette.

2. The optical system according to one of claim 1 , wherein the first light guide is designed in the shape of a Y, and wherein a first branch leads in the direction of the optical detector, a second branch guides the reference light, and a third branch guides the measurement light.

3. The optical system according to claim 1 , which comprises exactly one light guide.

4. The optical system according to claim 1 , further comprising:
a second light guide for reference light, wherein the first light guide and the second light guide differ as to type, diameter, material, and/or number of fibers.

5. The optical system according to one of claim 1 , further comprising:
a first optical component including a biconvex lens disposed in the region of the light source and configured to guide the measurement light into the direction of medium.

6. The optical system according to claim 5 , wherein the first optical component is configured to focus the measurement light onto the first light guide on the optical detector side.

7. The optical system according to claim 5 , further comprising:
on the optical detector side, a second optical component including at least one lens and configured to focus absorbed measurement light onto the first light guide.

8. The optical system according to claim 1 , wherein the optical detector is arranged apart from an optical axis of the system.

9. The optical system according to claim 1 , wherein the optical detector is designed as a spectrometer such that a spectrum of the light impinging on the optical detector is displayed.

Assignees

• Endress Hauser Conducta Gmbh Co Kg

Inventors

• Krätschmer Thilo
• Müller Frank
• Vaca-Torres Alejandro

Classifications

• G01N2201/082

  Fibres for a reference path · CPC title

• G01J3/08

  Beam switching arrangements · CPC title

• G01N21/255 Primary

  Details, e.g. use of specially adapted sources, lighting or optical systems · CPC title

• G01J3/00

  Spectrometry; Spectrophotometry; Monochromators; Measuring colours · CPC title

• G01J3/0218

  using optical fibers · CPC title