DE102004018529B4 - laser measurement system - Google Patents
laser measurement system Download PDFInfo
- Publication number
- DE102004018529B4 DE102004018529B4 DE200410018529 DE102004018529A DE102004018529B4 DE 102004018529 B4 DE102004018529 B4 DE 102004018529B4 DE 200410018529 DE200410018529 DE 200410018529 DE 102004018529 A DE102004018529 A DE 102004018529A DE 102004018529 B4 DE102004018529 B4 DE 102004018529B4
- Authority
- DE
- Germany
- Prior art keywords
- laser
- measuring system
- observation room
- photosensor
- light source
- 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.)
- Expired - Fee Related
Links
- 238000005259 measurement Methods 0.000 title abstract description 11
- 239000012530 fluid Substances 0.000 claims abstract description 7
- 239000000470 constituent Substances 0.000 claims abstract 2
- 239000007789 gas Substances 0.000 claims description 29
- 239000003546 flue gas Substances 0.000 claims description 10
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 8
- 238000001285 laser absorption spectroscopy Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 3
- 238000002485 combustion reaction Methods 0.000 claims 2
- 238000011156 evaluation Methods 0.000 claims 1
- 230000003287 optical effect Effects 0.000 description 18
- 238000010926 purge Methods 0.000 description 12
- 238000012360 testing method Methods 0.000 description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 239000000779 smoke Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000011010 flushing procedure Methods 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000012780 transparent material Substances 0.000 description 2
- BJQHLKABXJIVAM-UHFFFAOYSA-N bis(2-ethylhexyl) phthalate Chemical compound CCCCC(CC)COC(=O)C1=CC=CC=C1C(=O)OCC(CC)CCCC BJQHLKABXJIVAM-UHFFFAOYSA-N 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000000112 cooling gas Substances 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
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
- G01N21/47—Scattering, i.e. diffuse reflection
- G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid
- G01N21/53—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke
- G01N21/534—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke by measuring transmission alone, i.e. determining opacity
-
- 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
- G01N21/17—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
- G01N21/39—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/02—Details
- G01J3/0205—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows
- G01J3/021—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows using plane or convex mirrors, parallel phase plates, or particular reflectors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/02—Details
- G01J3/0289—Field-of-view determination; Aiming or pointing of a spectrometer; Adjusting alignment; Encoding angular position; Size of measurement area; Position tracking
-
- 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
- G01N2021/3513—Open path with an instrumental source
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)
- Optics & Photonics (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
Lasermeßsystem zur Messung eines Fluid-Bestandteils in einem Beobachtungsraum (13), mit mindestens einer zur Erzeugung eines Laserstrahls bestimmten Laserlichtquelle (19), die auf einer Seite des Beobachtungsraums (13) befestigt ist, und mit mindestens einem Photosensor (20), der der Laserlichtquelle (19) gegenüberliegend auf der anderen Seite des Beobachtungsraums (13) befestigt ist, gekennzeichnet durch ein motorisch verstellbares Strahlablenkungs-Mittel (22), über das der Laserstrahl der Laserlichtquelle (19) in den Beobachtungsraum (13) geleitet wird, wobei zumindest ein Teil des Lichtes des Laserstrahls auf einen positionsempfindlichen Lichtsensor (25) geleitet wird, dessen Signal zur Verstellung des Strahlablenkungs-Mittels (22) verwendet wird.laser measurement system for measuring a fluid constituent in an observation room (13), with at least one intended for generating a laser beam Laser light source (19) on one side of the observation room (13) is fixed, and with at least one photosensor (20), the the laser light source (19) opposite is attached to the other side of the observation room (13), characterized by a motor-adjustable beam deflection means (22), above that of the laser beam of the laser light source (19) in the observation room (13), wherein at least part of the light of the laser beam is directed to a position sensitive light sensor (25), its signal for adjusting the beam deflection means (22) is used.
Description
Die Erfindung betrifft ein Lasermeßsystem zur Messung eines Fluid-Bestandteils in einem Beobachtungsraum, mit mindestens einer zur Erzeugung eines Laserstrahls bestimmten Laserlichtquelle, die auf einer Seite des Beobachtungsraums befestigt ist, und mit mindestens einem Photosensor, der der Laserlichtquelle gegenüberliegend auf der anderen Seite des Beobachtungsraums befestigt ist. Insbesondere betrifft sie ein System zur Durchführung einer Laser-Absorptionsspektroskopie in Rauchgaskanälen oder Feuerräumen zur Ermittlung bestimmter Bestandteile, wie z.B. der Sauerstoffkonzentration in Rauchgasen.The The invention relates to a laser measuring system for Measurement of a fluid component in an observation room, with at least one for generating a Laser beam specific laser light source, which is on one side of the Observation room is fixed, and with at least one photosensor, the opposite of the laser light source attached to the other side of the observation room. Especially it relates to a system for performing laser absorption spectroscopy in flue gas ducts or furnaces to detect certain components, e.g. the oxygen concentration in flue gases.
Bei der Laser-Absorptionsspektroskopie wird ein Laserstrahl durch das zu messende Medium geleitet. Dieser Laserstrahl wird von der Laserlichtquelle erzeugt und muß den Photosensor mit einer Fläche von ca. 1 cm2 treffen.In laser absorption spectroscopy, a laser beam is passed through the medium to be measured. This laser beam is generated by the laser light source and must hit the photosensor with an area of about 1 cm 2 .
Um diesen Photosensor auf eine für Rauchgaskanäle oder Feuerräume typische Distanz von 1 bis 30 m zu treffen, bedarf es einer genauen Ausrichtung von Laser und Photosensor zueinander. Bei 1 m ergeben 1° Winkelabweichung bereits 1,74 cm Abweichung am Ort des Photosensors. Bei 10 m sind dies dann bereits 17,4 cm.Around this photosensor on a for Flue gas ducts or fire chambers typical distance of 1 to 30 m to meet, it requires a precise Alignment of laser and photosensor to each other. At 1 m result 1 ° angle deviation already 1.74 cm deviation at the location of the photosensor. At 10 m this is then already 17.4 cm.
Aufgrund der Konstruktion von Rauchgaskanälen bzw. Feuerräumen wurde beobachtet, daß diese sich durch Temperaturunterschiede und -schwankungen verziehen bzw. verwinden. Diese Verwindungen bzw. dieses Verziehen kann zu einer Fehlausrichtung zwischen Laser und Photosensor des Lasermeßsystems führen, die ab einer bestimmten Größe nicht mehr durch rein optische Maßnahmen ausgeglichen werden kann. Es ist damit zu rechnen, daß bei Rauchgaskanälen bzw. Feuerräumen ein Verziehen des Kanals von bis zu zehn Zentimetern und eine Verwindung von bis zu einem halben Grad eintreten kann.by virtue of the construction of flue gas ducts or fires it was observed that these warped by temperature differences and fluctuations or twist. This distortion or warping can lead to a Misalignment between the laser and the photosensor of the laser measurement system to lead, not from a certain size more through purely optical measures can be compensated. It is to be expected that in flue gas ducts or furnaces a warping of the channel of up to ten centimeters and a twist up to half a degree.
Ein
allgemeiner Verstellmechanismus zur Verstellung der Positionen eines
Lichtstrahlers und eines Lichtempfängers ist in der
Die
Schließlich offenbart
die Druckschrift
Aufgabe der Erfindung ist es, die Zuverlässigkeit eines Lasermeßsystems zu erhöhen. Insbesondere sollen Formänderungen der Vorrichtungen zur Befestigung der optischen Komponenten am Beobachtungsraum ausgeglichen werden, die meist auf thermischen Änderungen und Schwankungen beruhen.task The invention is the reliability a laser measuring system to increase. In particular, form changes the devices for attaching the optical components to the observation room are compensated, mostly due to thermal changes and fluctuations based.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß ein motorisch verstellbares Strahlablenkungs-Mittel vorgesehen ist, über das der Laserstrahl der Laserlichtquelle in den Beobachtungsraum geleitet wird, wobei zumindest ein Teil des Lichtes des Laserstrahls auf einen positionsempfindlichen Lichtsensor geleitet wird, dessen Signal zur Verstellung des Strahlablenkungs-Mittels verwendet wird.These Task is inventively characterized solved, the existence motorized adjustable beam deflection means is provided over the the laser beam of the laser light source is directed into the observation room is at least a part of the light of the laser beam on a position-sensitive light sensor is passed whose signal is used to adjust the beam deflecting agent.
Das Strahlablenkungs-Mittel kann das Licht des Laserstrahls durch Brechung oder Reflexion ablenken. Vorzugsweise wird der Laserstrahl über einen motorisch unabhängig um zwei Achsen verschwenkbaren Spiegel geleitet, welcher das Strahlablenkungs-Mittel bildet. Dieser Spiegel läßt sich präzise und nahezu spielfrei über zwei Präzisionsmotoren um einen maximalen Winkel von 1° um beide Achsen verschwenken. Die Auflösung, d.h. die Genauigkeit der Positionseinstellung des Spiegels, beträgt hierbei vorzugsweise 1/100°, also etwa eine halbe Winkelminute.The Beam deflection means can be the light of the laser beam by refraction or distract reflection. Preferably, the laser beam via a independent of motor guided by two axes pivotable mirror which the beam deflection means forms. This mirror can be precise and almost backlash over two precision motors by a maximum angle of 1 ° pivot both axes. The resolution, i. the precision the position adjustment of the mirror, in this case is preferably 1/100 °, that is about a half minute angle.
Auf der Empfängerseite wird der Laserstrahl auf den positionsempfindlichen Lichtsensor, z.B. eine sogenannte Vierquadrantendiode, geleitet. Diese lichtempfindliche Diode hat vier aktive Quadranten, so daß eindeutig die Position des Laserstrahls in bezug auf ihren Mittelpunkt festgestellt werden kann. Die Signale der einzelnen Quadranten werden verstärkt und an einen Mikroprozessor weitergeleitet. Mittels der nun gewonnenen Information über die Position des Laserstrahls kann der Mikroprozessor einen Korrekturwert für die Betätigung der Verstellmotoren errechnen, so daß der Laserstrahl über den motorisch bewegbaren Spiegel am Sender (Laserlichtquelle) nachgeführt werden kann.On the receiver side, the laser beam is directed to the position-sensitive light sensor, eg a so-called four-quadrant diode. These Photosensitive diode has four active quadrants, so that the position of the laser beam with respect to its center can be clearly determined. The signals of the individual quadrants are amplified and forwarded to a microprocessor. By means of the now obtained information about the position of the laser beam, the microprocessor can calculate a correction value for the actuation of the adjusting motors, so that the laser beam can be tracked via the motor-driven mirror on the transmitter (laser light source).
Somit ist durch die motorische Strahlnachführung gewährleistet, daß der Laserstrahl empfängerseitig jederzeit mittig auf den Photosensor, der das Meßsignal erzeugt, ausgerichtet ist. Verlagerungen des Auftreffpunktes des Strahls gegebenenfalls über den Rand des Photosensors hinaus werden zuverlässig vermieden.Consequently is ensured by the motor beam tracking that the laser beam receiving end at the center of the photosensor, which generates the measuring signal is. Displacements of the point of impact of the beam optionally over the Edge of the photosensor are reliably avoided.
In einer praktischen Ausführungsform wird der Laserstrahl über einen Strahlteiler in zwei Strahlgänge aufgeteilt. Ein Strahlgang trifft auf den Photosensor für die Erzeugung des Absorptionssignals, der andere trifft auf die Vierquadrantendiode. Der Strahlteiler ist üblicherweise ein halbdurchlässiger Reflektor wie beispielsweise ein halbdurchlässiger Spiegel oder ein halbdurchlässiges Prisma.In a practical embodiment the laser beam is over split a beam splitter into two beam paths. A beam path meets the photosensor for the generation of the absorption signal, the other applies to the Four-quadrant diode. The beam splitter is usually a semipermeable reflector such as a semitransparent mirror or a semipermeable prism.
Wie eingangs erwähnt, wird das erfindungsgemäße Lasermeßsystem in einer praktischen Ausführungsform zur Durchführung einer Laser-Absorptionsspektroskopie eingesetzt. Durch dieses Verfahren wird die Absorption des Laserlichtes über die Meßstrecke ermittelt. Aus der gemessenen Lichtintensität, welche umgekehrt proportional zum Maß der Absorption ist, läßt sich die Menge oder Konzentration bestimmter Bestandteile, zum Beispiel der Sauerstoffgehalt in Rauchgasen, in dem Beobachtungsraum ermitteln. Gegebenenfalls werden Messungen mit Laserlicht unterschiedlicher Wellenlänge durchgeführt.As mentioned in the beginning, becomes the laser measuring system according to the invention in a practical embodiment to carry out a laser absorption spectroscopy used. By this method, the absorption of the laser light over the measuring path determined. From the measured light intensity, which is inversely proportional to the degree of absorption is, can be the amount or concentration of certain ingredients, for example determine the oxygen content in flue gases, in the observation room. Optionally, measurements with laser light become different wavelength carried out.
Eine beispielhafte Ausführungsform der Erfindung wird nachfolgend unter Bezugnahme auf die beigefügten Zeichnungen beschrieben. Die Zeichnungen zeigen in:A exemplary embodiment The invention will be described below with reference to the accompanying drawings described. The drawings show in:
Die
Für den üblichen
Meßbetrieb
wird ein neutrales Spülgas
in den Innenraum
Zur Überprüfung der
Funktion des Meßsystems
kann der Prüfgaskanal
Wie
erwähnt,
enthält
das erfindungsgemäße Meßsystem
zwei optische Komponenten, nämlich eine
Laserlichtquelle
Das
in
Die
Innenwandung des Einschraubrings
Das
poröse
Material über
den größten Teil der
Länge des
Ausströmrohrs
Die
Gesamtlänge
des Ausströmrohrs
In
der
Ferner
weist, wie in
Die
Der
Laser
Der
auf den positionsempfindlichen Lichtsensor
Grundsätzlich ist
jeder positionsempfindliche Lichtsensor, wie beispielsweise eine
Flächendiode, verwendbar.
Vorzugsweise wird eine Vierquadrantendiode
Durch
das Meßsignal
der Vierquadrantendiode kann der Verstellmotor
Das erfindungsgemäße Meßsystem kann auch mehrere Laserlichtquellen und Photosensoren umfassen, die zum Beispiel jeweils mit verschiedenen Wellenlängen arbeiten. Auch können weitere optische Komponenten im Bedarfsfall im Strahlengang des Laserstrahls angeordnet werden.The Measuring system according to the invention may also include multiple laser light sources and photosensors, for example, each working with different wavelengths. Also can additional optical components in case of need in the beam path of the Laser beam are arranged.
- 11
- optisches Gerät, optische Komponenteoptical Device, optical component
- 22
- Sichtfensterwindow
- 33
- Sichtfensterwindow
- 44
- rohrförmiger Körpertubular body
- 55
- Innenrauminner space
- 66
- PrüfgaskanalPrüfgaskanal
- 77
- Entlüftungskanalvent channel
- 88th
- Spülgaskanalpurge gas
- 99
- Austrittskanaloutlet channel
- 1010
- Ringnutring groove
- 1111
- Einschraubringscrew ring
- 1212
- radialer Kanalradial channel
- 1313
- Beobachtungsraumobservation room
- 1414
- poröse Hülseporous sleeve
- 1515
- poröse Hülseporous sleeve
- 1616
- Ausströmrohroutflow
- 1717
- Mündungsringmouth ring
- 1818
- optische Achse, Laserstrahloptical Axis, laser beam
- 1919
- LaserlichtquelleLaser light source
- 2020
- Photosensorphotosensor
- 2121
- Laserlaser
- 2222
- Strahlablenkungs-Mittel, SpiegelBeam deflection means mirror
- 2323
- Verstellmotoradjusting
- 2424
- Strahlteilerbeamsplitter
- 2525
- positionsempfindlicher Lichtsensor, Vierquadrantendiodeposition-sensitive Light sensor, four-quadrant diode
- 2626
- Dichtringseal
- Q1–Q4Q1-Q4
- Quadrantquadrant
- ββ
- Keilwinkelwedge angle
Claims (8)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200410018529 DE102004018529B4 (en) | 2004-04-14 | 2004-04-14 | laser measurement system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200410018529 DE102004018529B4 (en) | 2004-04-14 | 2004-04-14 | laser measurement system |
Publications (2)
Publication Number | Publication Date |
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DE102004018529A1 DE102004018529A1 (en) | 2005-11-03 |
DE102004018529B4 true DE102004018529B4 (en) | 2007-01-18 |
Family
ID=35070521
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DE200410018529 Expired - Fee Related DE102004018529B4 (en) | 2004-04-14 | 2004-04-14 | laser measurement system |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102017212782A1 (en) | 2017-07-25 | 2019-01-31 | Siemens Aktiengesellschaft | In-situ laser spectrometer |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102980739B (en) * | 2012-10-30 | 2015-05-20 | 华中科技大学 | Pulse gas laser intracavity flow field measurement device based on four-quadrant detector |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3006046A1 (en) * | 1980-02-18 | 1981-08-20 | Siemens AG, 1000 Berlin und 8000 München | Optical measurement of smoke density - using narrow beam and hollow receiver chamber with diffusely reflecting internal walls |
DE69123181T2 (en) * | 1990-06-23 | 1997-06-12 | Kidde Fire Protection Ltd | Smoke particle detector |
EP0557655B1 (en) * | 1992-02-24 | 1997-09-17 | Hewlett-Packard Company | System for collecting weakly scattered optical signals |
EP1202230A1 (en) * | 2000-10-25 | 2002-05-02 | SA Sefi | Smoke detector system |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3376116B2 (en) * | 1994-08-22 | 2003-02-10 | 関西国際空港株式会社 | Separate type dimmable smoke detector with remote control optical axis adjustment function and fire receiving system using the same |
JP3126941B2 (en) * | 1997-06-30 | 2001-01-22 | ホーチキ株式会社 | Smoke detector |
-
2004
- 2004-04-14 DE DE200410018529 patent/DE102004018529B4/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3006046A1 (en) * | 1980-02-18 | 1981-08-20 | Siemens AG, 1000 Berlin und 8000 München | Optical measurement of smoke density - using narrow beam and hollow receiver chamber with diffusely reflecting internal walls |
DE69123181T2 (en) * | 1990-06-23 | 1997-06-12 | Kidde Fire Protection Ltd | Smoke particle detector |
EP0557655B1 (en) * | 1992-02-24 | 1997-09-17 | Hewlett-Packard Company | System for collecting weakly scattered optical signals |
EP1202230A1 (en) * | 2000-10-25 | 2002-05-02 | SA Sefi | Smoke detector system |
Non-Patent Citations (4)
Title |
---|
JP 08-0 62 135 A (PAJ-Abstract) |
JP 11-0 25 373 A (PAJ-Abstract) |
JP 08062135 A (PAJ-Abstract) * |
JP 11025373 A (PAJ-Abstract) * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102017212782A1 (en) | 2017-07-25 | 2019-01-31 | Siemens Aktiengesellschaft | In-situ laser spectrometer |
Also Published As
Publication number | Publication date |
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