EP1792164A1 - Module reflecteur pour un capteur de gaz photometrique - Google Patents

Module reflecteur pour un capteur de gaz photometrique

Info

Publication number
EP1792164A1
EP1792164A1 EP05767949A EP05767949A EP1792164A1 EP 1792164 A1 EP1792164 A1 EP 1792164A1 EP 05767949 A EP05767949 A EP 05767949A EP 05767949 A EP05767949 A EP 05767949A EP 1792164 A1 EP1792164 A1 EP 1792164A1
Authority
EP
European Patent Office
Prior art keywords
reflector
gas sensor
infrared
sensor according
photometric
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP05767949A
Other languages
German (de)
English (en)
Inventor
Michael Arndt
Gerd Lorenz
Johann Wehrmann
Ronny Ludwig
Hans Lubik
Thomas Sperlich
Vincent Thominet
Maximilian Sauer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1792164A1 publication Critical patent/EP1792164A1/fr
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
    • G01N21/3504—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/01—Arrangements or apparatus for facilitating the optical investigation
    • G01N21/03—Cuvette constructions
    • G01N21/0303—Optical path conditioning in cuvettes, e.g. windows; adapted optical elements or systems; path modifying or adjustment

Definitions

  • Reflector module for a photometric gas sensor
  • the invention relates to a photometric gas sensor for determining a
  • Radiometry Sensors based on spectroscopy (photometry).
  • radiation from one or more radiation sources in particular in the infrared wavelength range
  • a detector element which converts the incoming radiation intensity into electrical voltage and current.
  • the radiation emitted by the source must Radiation as directly as possible and bundled to be guided to the detector element. This can be achieved either by the fact that the radiation source and the detector element are directly opposite ("face-to-face arrangement") or by the use of reflector modules, which redirect the radiation and additionally bundle.
  • a device for the detection of radiation signals and a device for measuring the concentration of a substance is known.
  • a first detector and a second detector are provided on a first chip and a provided first filter and a second filter on a second chip, wherein the first chip and the second chip are hermetically sealed together.
  • the invention relates to a photometric gas sensor for determining a
  • Gas concentration or the concentration value of a gas or a gas concentration descriptive size comprising an infrared radiation source, a first reflector for deflecting a coming from an infrared radiation source infrared radiation to a second reflector, a second reflector for deflecting the radiation coming from the first reflector to one Infrared detector and an infrared detector.
  • Part of a housing component made of plastic.
  • the use of plastic components allows a cost-effective design.
  • An advantageous embodiment of the invention is characterized in that the first and second reflector are formed as mirrored surfaces of the plastic.
  • An advantageous embodiment of the invention is characterized in that the infrared radiation source and the infrared detector are mounted on a common circuit board.
  • An advantageous embodiment of the invention is characterized in that the housing component is the cover of the sensor.
  • the integration of the reflectors in the cover a particularly compact design is achieved.
  • An advantageous embodiment of the invention is characterized in that the cover has at least one füröffiiitch, through which the gas can flow into the interior of the gas sensor.
  • Reflector and the second reflector are arranged such that the beam direction of the deflected from the first reflector to the second reflector infrared radiation is substantially parallel to the surface of the circuit board.
  • An advantageous embodiment of the invention is characterized in that two infrared detectors are present or an infrared detector with two sensor elements is present, that the second reflector consists of two partial reflectors, which divides the radiation coming from the first reflector into two partial beams going in different directions, that the two partial reflectors are arranged such that each of the two partial beams impinges on a different one of the two infrared detectors.
  • a second infrared detector a comparative measurement is possible.
  • the use of a second infrared detector also allows the measurement of the concentration of a second or other instead of a comparison measurement
  • An advantageous embodiment of the invention is characterized in that in that in that the second reflector consists of two reflectors or partial reflectors arranged side by side and is arranged in such a way that the radiation coming from the first reflector impinges on the boundary between the two partial reflectors so that part of the radiation impinges on each of the two partial reflectors.
  • An advantageous embodiment of the invention is characterized in that mounted on the housing component receptacles for mounting the infrared source and the infrared detector. This allows a very precise arrangement of the components relative to each other.
  • the drawing consists of the figures 1 to S.
  • FIG. 1 shows a view from the outside onto a first embodiment of the reflector module.
  • Figure 2 shows a view into the interior of a first ⁇ usbowungsform of the reflector module.
  • FIG. 3 shows a view from the outside onto a second embodiment of the reflector module.
  • FIG. 4 shows a view into the interior of a second embodiment of the reflector module.
  • FIG. 5 shows a section with recordings for the radiation source and the detector.
  • the invention serves to optimally bundle the radiation power of a radiation source with the aid of one or more optical reflector modules and to guide it via the absorption path to the detector element. It will be two or three
  • This optical reflector module can be used for a photometric gas sensor.
  • FIGS. 1, 2, 3 and 4 show two embodiments of the reflector module.
  • the module is designed with respect to the beam path from the radiation source a to the radiation detector b such that the reflector Rl bundles the radiation received by the radiation source a and parallel to the bottom part 53 (on which the radiation source and the radiation receiver are mounted) to the reflector R3 directs and reflector R3 re-focuses the radiation and steers vertically down to the detector (s).
  • Fig. 1 and Fig. 2 show an embodiment as a deep-drawn metal construction
  • Fig. 3 and Fig. 4 show an embodiment of plastic.
  • FIGS. 1 to 4 This arrangement is shown in FIGS. 1 to 4. This is a closed reflector module, under which the radiation source a and the detector element b are located.
  • the reflector module includes the reflector Rl for focusing and deflection of the beam path of the
  • Radiation source the component R2, which represents a cover for the reflector module, and one or two partial reflectors R3a and R3b, which concentrate and deflect the radiation onto the detector element or the detector elements.
  • the reflector module is a single one
  • the reflector module can be constructed of an internally mirrored plastic or designed as a metal construction.
  • the metal construction may e.g. be produced by a deep drawing process. The supply of the gas to be analyzed in the
  • the component R2 is omitted.
  • the region of the plane-parallel beam guidance between the reflector part Rl and the reflector part R3 is open.
  • the design of the reflectors Rl and R3 remains unchanged in this arrangement. These can be designed as a coherent module or as individual reflectors.
  • the omission of the reflector part R2 creates an open system in which the gas to be measured can be detected directly in the ambient atmosphere.
  • the advantage of this design is the faster detection of the sample gas in the ambient atmosphere. This is made possible by the lack of a housing part, through which the sample gas must first diffuse.
  • Both the open-path and closed-path arrangements can use the same reflectors with the same spacing. Both arrangements are independent of the optical bandwidth of the detector element and the
  • Frequency range of the infrared radiation and can therefore be used universally for all photometric gas sensors of the present type.
  • Another decisive factor for the performance of an optical sensor system is the most accurate possible positioning of detector, reflector and radiation source relative to each other. Only in this way can it be ensured that the largest possible part of the radiation power is supplied to the detector and thus leads to a maximum signal yield. This means a minimization of the tolerance chain
  • Radiation source reflector module detector and can be achieved by constructive measures on the reflector.
  • recordings are provided in the reflector, which ensure the alignment of the lamp and the detector with respect to the reflector module or the housing component during assembly.
  • the manufacturing tolerances of the reflector are the only relevant in the assembly of the overall system. This has the following two advantages: the beam directed from the second reflector onto the sensor element can be bundled more strongly, since the position of the sensor relative to the reflector is fixed by the orientation of the sensor element or detector on the reflector. The resulting smaller focus spot results in a higher radiation density, which in the
  • Sensor element generates a higher electrical absolute signal
  • the mounting of the three components reflector module, detector and radiation source is substantially simplified by the exact positioning to each other, it is avoided that the focus spot of the infrared radiation, the sensor element eckeh not, or located next to the photosensitive part of the sensor element.
  • a possible assembly sequence of the three components reflector, detector and radiation source is described below: - Pressing the detector into a receptacle of the reflector.
  • the reflector-detector unit Equipping the reflector-detector unit.
  • SMD surface mounted device
  • the radiation source is introduced through an over-drilled hole in a guide of the reflector and then soldered in SMD technology.
  • the printed circuit board can first be equipped with the detector.
  • Alignment of the reflector and the lamp then takes place via the permanently integrated detector.
  • alignment of all three components is also possible via the radiation source as a reference.
  • the radiation source can be equipped from above. In both cases, however, the alignment of all three components must always be ensured by appropriate design measures on the reflector.
  • receptacles 51 and 52 for the lamp a and the detector element b are shown.
  • 51 is a guide for the lamp a (i.e., lamp guide)
  • 52 is a guide for the reflector b (i.e.
  • the second reflector may also include two adjacent subreflectors R3a and R3b.
  • the focal point of the incoming from the first reflector infrared beam falls on the boundary line between the partial reflectors R3a and R3b.
  • the halves of the focus point falling on R3a and R3b are deflected in two different directions.
  • the infrared detector b is designed as a two-channel detector, e.g. with a measuring channel and a reference channel.
  • One of the two partial beams impinges on the sensor element assigned to the measuring channel and the other partial beam impinges on the sensor element assigned to the reference channel.
  • the two sensor elements can be used as e.g. adjacent chips may be realized in a common housing or even side by side on a chip.
  • the gas sensor is suitable because of its small size for use in a motor vehicle, in particular for determining the carbon dioxide concentration in the air in

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

L'invention concerne un capteur de gaz photométrique, comportant au moins une source de rayonnement infrarouge (a) et un premier réflecteur (R1) destiné à dévier un rayonnement infrarouge provenant d'une source de rayonnement infrarouge (a) vers un second réflecteur (R3a, R3b), qui dévie le rayonnement provenant du premier réflecteur vers un détecteur infrarouge (b).
EP05767949A 2004-09-13 2005-07-14 Module reflecteur pour un capteur de gaz photometrique Ceased EP1792164A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004044145A DE102004044145B3 (de) 2004-09-13 2004-09-13 Reflektormodul für einen photometrischen Gassensor
PCT/EP2005/053393 WO2006029920A1 (fr) 2004-09-13 2005-07-14 Module reflecteur pour un capteur de gaz photometrique

Publications (1)

Publication Number Publication Date
EP1792164A1 true EP1792164A1 (fr) 2007-06-06

Family

ID=35094594

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05767949A Ceased EP1792164A1 (fr) 2004-09-13 2005-07-14 Module reflecteur pour un capteur de gaz photometrique

Country Status (5)

Country Link
US (1) US20090039267A1 (fr)
EP (1) EP1792164A1 (fr)
JP (1) JP2007507723A (fr)
DE (1) DE102004044145B3 (fr)
WO (1) WO2006029920A1 (fr)

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WO2008073400A1 (fr) 2006-12-11 2008-06-19 The Regents Of The University Of California Diodes électroluminescentes transparentes
KR100982914B1 (ko) * 2008-03-05 2010-09-20 주식회사 휴비츠 적외선 통신을 이용한 자동 리프렉터 시스템
DE102009000182A1 (de) 2009-01-13 2010-07-15 Robert Bosch Gmbh Messvorrichtung, Anordnung und Verfahren zur Messung eines Gehaltes an mindestens einer Komponente in einem flüssigen Kraftstoff
DE102009001615A1 (de) 2009-03-17 2010-09-23 Robert Bosch Gmbh Steuerungsanordnung für ein Abgasrückführungssystem, Abgasrückführungssystem und Verfahren zum Betreiben eines Abgasrückführungssystems
DE102009057078B4 (de) * 2009-12-04 2013-03-14 Abb Ag Photometrischer Gasanalysator
JP5906407B2 (ja) 2011-04-11 2016-04-20 パナソニックＩｐマネジメント株式会社 気体成分検出装置
JP2012220353A (ja) * 2011-04-11 2012-11-12 Panasonic Corp 気体成分検出装置
KR101755712B1 (ko) * 2011-10-05 2017-07-10 현대자동차주식회사 차량 실내 이산화탄소농도 측정장치
US8969808B2 (en) * 2012-06-19 2015-03-03 Amphenol Thermometrics, Inc. Non-dispersive infrared sensor with a reflective diffuser
SE536784C2 (sv) 2012-08-24 2014-08-05 Automotive Coalition For Traffic Safety Inc System för utandningsprov
SE536782C2 (sv) 2012-08-24 2014-08-05 Automotive Coalition For Traffic Safety Inc System för utandningsprov med hög noggrannhet
DE102012215660B4 (de) 2012-09-04 2014-05-08 Robert Bosch Gmbh Optische Gassensorvorrichtung und Verfahren zum Bestimmen der Konzentration eines Gases
DE102013212512A1 (de) 2013-06-27 2015-01-15 Robert Bosch Gmbh Außenteil für ein Gerät und Gerät
DE102014015378A1 (de) 2014-10-17 2016-04-21 Audi Ag Gehäuse für ein Head-up-Display eines Kraftfahrzeugs und Verfahren zum Bereitstellen eines Gehäuses für ein Head-up-Display
US9823237B2 (en) 2015-06-05 2017-11-21 Automotive Coalition For Traffic Safety, Inc. Integrated breath alcohol sensor system
US11104227B2 (en) 2016-03-24 2021-08-31 Automotive Coalition For Traffic Safety, Inc. Sensor system for passive in-vehicle breath alcohol estimation
US10724945B2 (en) 2016-04-19 2020-07-28 Cascade Technologies Holdings Limited Laser detection system and method
US10180393B2 (en) 2016-04-20 2019-01-15 Cascade Technologies Holdings Limited Sample cell
EP3144663B1 (fr) 2016-11-18 2020-06-17 Sensirion AG Module de détecteur de gaz
DE102016125840B4 (de) * 2016-12-29 2018-11-08 Infineon Technologies Ag Gasanalysevorrichtung
GB201700905D0 (en) 2017-01-19 2017-03-08 Cascade Tech Holdings Ltd Close-Coupled Analyser
DE102017205974A1 (de) 2017-04-07 2018-10-11 Robert Bosch Gmbh Optische Sensorvorrichtung zum Messen einer Fluidkonzentration und Verwendung der optischen Sensorvorrichtung
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Also Published As

Publication number Publication date
WO2006029920A1 (fr) 2006-03-23
US20090039267A1 (en) 2009-02-12
DE102004044145B3 (de) 2006-04-13
JP2007507723A (ja) 2007-03-29

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