US 12,078,591 B2
Optical measuring assembly and gas sensor comprising same
Farhang Ghasemi Afshar, Wenzenbach (DE)
Assigned to OSRAM Opto Semiconductors GmbH, Regensburg (DE)
Appl. No. 17/597,040
Filed by OSRAM Opto Semiconductors GmbH, Regensburg (DE)
PCT Filed Jul. 2, 2020, PCT No. PCT/EP2020/068627
§ 371(c)(1), (2) Date Dec. 23, 2021,
PCT Pub. No. WO2021/004874, PCT Pub. Date Jan. 14, 2021.
Claims priority of application No. 102019210163.1 (DE), filed on Jul. 10, 2019.
Prior Publication US 2022/0236174 A1, Jul. 28, 2022
Int. Cl. G01N 21/3504 (2014.01); G01N 21/03 (2006.01)
CPC G01N 21/3504 (2013.01) [G01N 21/031 (2013.01); G01N 2021/3513 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An optical measuring arrangement comprising:
a tube section-shaped hollow body having a central axis extending from a first end face to an opposite second end face of the hollow body;
a spiral-shaped hollow light guide formed in an inner surface of the hollow body, wherein the inner surface comprises at least partially a light-reflecting material, and wherein the spiral-shaped hollow light guide is a hollow spiral winding around the central axis with hollow cross sections open toward the central axis;
a light source arranged at a first spiral end and at the first end face of the hollow body, the light source configured to emit a light beam into the hollow spiral so that the light beam, after a plurality of reflections inside the hollow spiral, emerges from a second spiral end at the second end face of the hollow body;
a light detector arranged at the second spiral end, the light detector configured to detect the emerging light beam and to output an electronic measurement signal as a function of the detected light beam; and
a common planar circuit board carrying both the light source and the light detector,
wherein the light source and the light detector are arranged in the hollow spiral at opposite end sections of an inner diameter of the hollow body, and
wherein the common circuit board is fastened on the hollow body in such a way that the central axis of the latter lies in a plane of the common circuit board.
 
14. An optical measuring arrangement comprising:
a tube section-shaped hollow body having a central axis extending from a first end face to an opposite second end face of the hollow body;
a spiral-shaped hollow light guide formed in an inner surface of the hollow body, wherein the inner surface comprises at least partially a light-reflecting material, and wherein the spiral-shaped hollow light guide is a hollow spiral winding around the central axis with hollow cross sections open toward the central axis;
a light source arranged at a first spiral end and at the first end face of the hollow body, the light source configured to emit a light beam into the hollow spiral so that the light beam, after a plurality of reflections inside the hollow spiral, emerges from a second spiral end at the second end face of the hollow body; and
a light detector arranged at the second spiral end, the light detector configured to detect the emerging light beam and to output an electronic measurement signal as a function of the detected light beam,
wherein each hollow cross section of the hollow spiral is part of an ellipse, and
wherein the light source is arranged at a first focus of a first ellipse.
 
20. An optical measuring arrangement comprising:
a tube section-shaped hollow body having a central axis extending from a first end face to an opposite second end face of the hollow body;
a spiral-shaped hollow light guide formed in an inner surface of the hollow body, wherein the inner surface comprises at least partially a light-reflecting material, and wherein the spiral-shaped hollow light guide is a hollow spiral winding around the central axis with hollow cross sections open toward the central axis;
a light source arranged at a first spiral end and at the first end face of the hollow body, the light source configured to emit a light beam into the hollow spiral so that the light beam, after a plurality of reflections inside the hollow spiral, emerges from a second spiral end at the second end face of the hollow body; and
a light detector arranged at the second spiral end, the light detector configured to detect the emerging light beam and to output an electronic measurement signal as a function of the detected light beam,
wherein each hollow cross section of the hollow spiral is part of an ellipse, and
wherein the light detector is arranged at a first focus of a second ellipse.