Patent · US Active

Actuation and evaluation circuit, measuring device and method for measuring the concentration of a gas

US8736842B2 · kind B2 · utility

0Cited by

6References

12Claims

0Family size

Assignee

CareFusion Germany 234 GmbH · DE

Inventors

Helmut Scherer · Lindau (Bodensee), DE
Dieter Schrader · Goldkronach, DE
Stefan Menninger · Würzburg, DE

Key dates

Filing date	Apr 14, 2010
Grant date	May 27, 2014
Priority date	—
Expiry date	Aug 12, 2030

Classification

Technology area (CPC G)Physics
CPC primaryG01N2201/12753
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

The invention relates to an actuation and evaluation circuit for a laser diode (1) and a photodiode (3) for determining the concentration of a gas. The laser diode can generate light in the range of an absorption line of the gas. The circuit comprises a driver (10, 11, 12, 13) for generating a driving signal (17) for the laser diode (1), an assembly (8, 9) for generating a reference signal (20), and a subtractor (5) for subtracting the reference signal (20) from the signal (21) supplied by the photodiode. The invention further relates to a measuring device for determining the concentration of a gas by means of such an actuation and evaluation circuit. Finally, the invention relates to a corresponding method.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.