초록 ▼

A gas detector system includes a transmitter (1), which has a light source (3), which emits an analytical light beam (5). A transmitter lens assembly (7), to focus the analytical light beam (5) in an emission direction (9), includes a receiver (19, 19′) with a receiver lens assembly (21), defining a

A gas detector system includes a transmitter (1), which has a light source (3), which emits an analytical light beam (5). A transmitter lens assembly (7), to focus the analytical light beam (5) in an emission direction (9), includes a receiver (19, 19′) with a receiver lens assembly (21), defining a receiver focal point (27, 27′) and a receiver axis (23). A light mixing rod (29) defines a first rod axis (35) that extends from an inlet end (31), pointing toward the receiver lens assembly (21), to an outlet end (33) facing an analytical detector (39) and a reference detector (45). An analytical filter (43, 43′) is arranged in front of the analytical detector (39) as viewed from the receiver lens assembly (21). A reference filter (49, 49′) is arranged in front of the reference detector (45) as viewed from the receiver lens assembly (21).

대표청구항 ▼

1. A gas detector system comprising: a transmitter comprising a light source, by which an analytical light beam is emitted, and with a transmitter lens assembly, which is designed to collimate the analytical light beam along an emission direction, anda receiver comprising a receiver lens assembly, w

1. A gas detector system comprising: a transmitter comprising a light source, by which an analytical light beam is emitted, and with a transmitter lens assembly, which is designed to collimate the analytical light beam along an emission direction, anda receiver comprising a receiver lens assembly, which defines a receiver focal point and a receiver axis, a light mixing rod, which has an inlet end and an outlet end and defines a rod axis extending from the inlet end to the outlet end, wherein the inlet end points towards the receiver lens assembly, an analytical detector and a reference detector, wherein the analytical detector is arranged on a side of the outlet end pointing away from the receiver lens assembly, an analytical filter, which is arranged in front of the analytical detector as viewed from the receiver lens assembly, and a reference filter, which is arranged in front of the reference detector as viewed from the receiver lens assembly. 2. A gas detector system in accordance with claim 1, wherein the receiver lens assembly has a field lens, which is arranged in front of the inlet end. 3. A gas detector system in accordance with claim 1, wherein the focal point is located within the light mixing rod. 4. A gas detector system in accordance with claim 1, wherein: the rod axis extends along the receiver axis;the outlet end has a prism assembly for splitting a beam leaving the light mixing rod into a first beam and a second beam;the first beam propagates along a first direction and the second beam propagates along a second direction, and the first direction and the second direction extend at an angle to the rod axis;the analytical detector is arranged along the first direction;the reference detector is arranged along the second direction;the analytical filter is arranged between the analytical detector and the outlet end and;the reference filter is arranged between the reference detector and the outlet end. 5. A gas detector system in accordance with claim 4, wherein the analytical filter and the reference filter are designed as bandpass filters, whose transmission ranges differ from one another. 6. A gas detector system in accordance with claim 4, further comprising a receiver light source arranged on a side of the outlet end pointing away from the receiver lens assembly on the receiver axis. 7. A gas detector system in accordance with claim 6, wherein the transmitter further comprises a filter arranged between the transmitter lens assembly and the light source and reflecting light falling on the transmitter lens assembly against the emission direction onto a position-sensitive detection means provided in the transmitter. 8. A gas detector system in accordance with claim 1, wherein: the light mixing rod has a circumferential wall extending between the inlet end and the outlet end;light-sensitive sensor diodes, are arranged on the circumferential wall at spaced locations from one another in the circumferential direction; andthe light-sensitive area of the sensors points towards the interior of the light mixing rod. 9. A gas detector system in accordance with claim 8, wherein the light mixing rod has a polygonal cross section as viewed at right angles to the rod axis. 10. A gas detector system in accordance with claim 1, wherein: the light mixing rod is a first light mixing rod, the inlet end is a first inlet end, the outlet end is a first outlet end and the rod axis is a first rod axis extending from the first inlet end to the first outlet end;the receiver defines a second light mixing rod, which has a second inlet end and a second outlet end, and a second rod axis extending from the second inlet end to the second outlet end;the second inlet end is arranged closer to the receiver lens assembly than the first inlet end, as viewed in the direction of a beam falling into the receiver;the first and second rod axes extend at an angle to one another;the reference detector is arranged on the side of the second outlet end pointing away from the receiver lens assembly as viewed in the direction of a beam falling into the receiver;the analytical filter is arranged between the first inlet end and the receiver lens assembly;the analytical filter is aligned such that light that falls on the analytical filter along the receiver axis and is not transmitted is reflected along the second rod axis onto the second inlet end; andthe reference filter is arranged between the receiver lens assembly and the analytical filter. 11. A gas detector system in accordance with claim 10, wherein: the first rod axis extends along the receiver axis; andthe second rod axis extends at an angle to the receiver axis. 12. A gas detector system in accordance with claim 10, wherein the reference filter is aligned such that light that falls on the reference filter along the receiver axis and is not transmitted is reflected onto a second position-sensitive detection means provided in the receiver. 13. A gas detector system in accordance with claim 10, wherein the optical path lengths between the receiver lens assembly and the first light rod and between the receiver lens assembly and the second light mixing rod are selected to be such that the focal point is located within the first and second light mixing rods. 14. A gas detector system in accordance with claim 10, wherein: the reference filter is designed as a bandpass filter;the analytical filter is designed as a cut-off filter andthe lower threshold wavelength of the bandpass filter is lower than the cut-off wavelength. 15. A gas detector system in accordance with claim 10, wherein the first and/or second light mixing rod is designed such that it conically tapers towards the outlet end. 16. A gas detector system in accordance with claim 12, wherein the first and/or second position-sensitive detection means is designed as a CCD, CMOS or quadrant detector.