# US 8,570,520 B2 · Optical measuring cell and gas monitor

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- Number: US 8,570,520 B2
- Document ID: US8570520B2
- Status: Granted
- Kind: B2
- Application number: 12/516,008
- Filed: 2007-11-19
- Published: 2010-06-17
- Granted: 2013-10-29
- Earliest claimed: 2006-11-22
- Assignees: Siemens Aktiengesellschaft
- Applicants: Maximilian Fleischer; Uwe Lampe; Rainer Strzoda
- Inventors: Maximilian Fleischer; Uwe Lampe; Rainer Strzoda
- Web page: https://patentgrep.com/patent/US8570520B2

## CPC

- G01N 21/3504: for analysing gases, e.g. multi-gas analysis
- G01N 21/05: Flow-through cuvettes (G01N21/09 takes precedence; handling fluid samples G01N1/10)
- G01N 21/31: Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry {(G01N21/72 takes precedence)}
- B01D 53/30: Controlling by gas-analysis apparatus (regulating non electrical variables in general G05D)
- G01N 2021/0346: {Capillary cells; Microcells}
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)

## Abstract

An optical measuring cell for measuring gas absorption with a light source for introducing light into a measuring volume and a light sensor located approximately opposite the light source in the direction of light propagation and relative to the measuring volume for receiving light that is guided through the measuring volume is provided. The concentration of one or multiple target gases in the measuring volume is detected by an evaluation unit. The measuring volume is constituted by an internal volume of a hollow fiber having an internal diameter less than 1 mm.

## Claims

### Claim 1

An optical measuring cell for a gas absorption measurement, comprising:
a light source for introducing light into a measuring volume;
a light sensor configured to detect light conducted through the measuring volume, the light sensor being arranged approximately opposing the light source in relation to the measuring volume and in the direction of propagation of the light source;
an evaluation unit configured to determine a concentration of one or more target gases in the measuring volume,
a gas delivery device for supplying the measuring volume with a flushing gas, wherein the gas delivery device supplies the flushing gas from a flushing gas generator, and wherein the flushing gas is directly generated in a cleaning procedure,
wherein the flushing gas generator comprises
a gas filter which is a heated palladium membrane and a gas delivery pump, or
a pump cell which conducts oxygen ions, wherein a voltage is applied across a primary side and a secondary side of the pump cell which includes heated zirconium ceramic material, wherein the voltage leads to oxygen transport through the pump cell; and
a hollow fiber, wherein the measuring volume is represented by an internal volume of the hollow fiber, the hollow fiber having an internal diameter of less than 1 mm.

### Claim 2 (depends on 1)

The optical measuring cell as claimed in claim 1, wherein inner surfaces of the hollow fiber are configured to be light-reflecting.

### Claim 3 (depends on 1)

The optical measuring cell as claimed in claim 1, wherein the flushing gas generator generates the flushing gas by one or more chemical reactions.

### Claim 4 (depends on 3)

The optical measuring cell as claimed in claim 3, wherein the flushing gas comprises a gas or a gas mixture which is not a gas to be detected in a target gas measurement.