CH577145A5 - Flame sensor for gas and oil burners - has fresnel lens filter or reflector for eliminating glow interference - Google Patents
Flame sensor for gas and oil burners - has fresnel lens filter or reflector for eliminating glow interferenceInfo
- Publication number
- CH577145A5 CH577145A5 CH1391274A CH1391274A CH577145A5 CH 577145 A5 CH577145 A5 CH 577145A5 CH 1391274 A CH1391274 A CH 1391274A CH 1391274 A CH1391274 A CH 1391274A CH 577145 A5 CH577145 A5 CH 577145A5
- Authority
- CH
- Switzerland
- Prior art keywords
- fresnel lens
- radiation
- optical system
- flame
- light
- Prior art date
Links
- 230000005855 radiation Effects 0.000 claims abstract description 26
- 230000003287 optical effect Effects 0.000 claims abstract description 23
- 239000004033 plastic Substances 0.000 claims abstract description 9
- 229920003023 plastic Polymers 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims abstract description 8
- 238000010521 absorption reaction Methods 0.000 claims abstract description 3
- 238000012544 monitoring process Methods 0.000 claims description 6
- 239000010410 layer Substances 0.000 claims description 4
- 239000002344 surface layer Substances 0.000 claims description 4
- 230000001419 dependent effect Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 claims description 2
- 238000001746 injection moulding Methods 0.000 claims description 2
- 229920000728 polyester Polymers 0.000 claims description 2
- 239000000295 fuel oil Substances 0.000 abstract 1
Classifications
-
- 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
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/0014—Radiation pyrometry, e.g. infrared or optical thermometry for sensing the radiation from gases, flames
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
- F23N5/08—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using light-sensitive elements
-
- 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
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/0014—Radiation pyrometry, e.g. infrared or optical thermometry for sensing the radiation from gases, flames
- G01J5/0018—Flames, plasma or welding
-
- 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
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
- G01J5/08—Optical arrangements
-
- 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
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
- G01J5/08—Optical arrangements
- G01J5/0801—Means for wavelength selection or discrimination
- G01J5/0802—Optical filters
-
- 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
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
- G01J5/08—Optical arrangements
- G01J5/0806—Focusing or collimating elements, e.g. lenses or concave mirrors
-
- 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
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
- G01J5/04—Casings
- G01J5/046—Materials; Selection of thermal materials
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
The flame sensor for gas and fuel oil burners has a housing with light sensitive element and an optical system for light collection and for eliminating undesirable radiations. This ensures that only flame radiation consisting of blue or near ultraviolet radiation is sensed and not red. Infrared radiation emitted by glowing furnace walls is not sensed. The optical system is a Fresnel lens made from a plastics material which absorbs light whose wavelength is longer than that of the blue light. Optical filter materials are embedded into lens material for absorption purposes. Alternatively the Fresnel lens surface may be coated with material reflecting light of wavelengths longer than that of the blue light.
Description
Die Erfindung bezieht sich auf eine Flammenfühler Anordnung zur Überwachung einer Flamme bei Gas- und Ölbrennern, bestehend aus einem Gehäuse, enthaltend ein lichtempfindliches Element und ein optisches System zur Lichtsammlung und Fernhaltung unerw4nschter Strahlungsanteile.
Für die Überwachung von Ö1- und Gasflammen sind Flammenfühler erwünscht, welche nur auf die direkt von der Flamme ausgehende Strahlung ansprechen, das heisst, auf deren blauen oder nahe gegen ultraviolett liegenden Strahlenanteil, während im Rot und Infrarot liegende Strahlung, die vor allem von glühenden Schamottewänden herrührt, nicht erfasst werden soll.
Nach der CH-PS 408211 ist ein optisches System in Verbindung mit einer justierbaren Vierschichtdiode bekannt, welches mit einem Absorptionsfilter und/oder einer Lochblende den langwelligen, unerwünschten Strahlungsanteil von der Vierschichtdiode unter gleichzeitiger Sammlung des gewünschten Lichtanteiles fernhält.
Der Erfindung liegt die Aufgabe zugrunde, das optische System einer solchen Fühler-Anordnung zu verbessern.
Diese Aufgabe ist erfindungsgemäss dadurch gelöst, dass das optische System aus einer Fresnel-Linse besteht.
Fresnel-Linsen als solche sind bekannt. Sie bestehen aus zentrisch angeordneten, lichtbrechenden Strukturen, die als schmale Kreisringe ausgebildet sind. Es sind damit optische Systeme mit sehr kleiner Brennweite bei grossem Öffnungsverhältnis herstellbar, weil jeder Kreisring entsprechend seinem Abstand vom Zentrum individuell optisch korrigiert werden kann. Dadurch ergibt sich eine hohe Beleuchtungsstärke bei kleiner Baulänge der Fühleranordnung.
Zur Erzielung einer Filterwirkung ist die Fresnel-Linse aus einem Kunststoff herstellbar, der unerwünschte langwellige Strahlungsanteile absorbiert, bzw. in den optische Filterstoffe eingebettet sind. Mit Vorteil wird die Fresnel-Linse - zweck- mässig zusätzlich - mit einer Oberflächenschicht versehen, welche die langwelligen Strahlungsanteile reflektiert.
Durch Verwendung einer Fresnel-Linse, welche durch Pressen oder Spritzen aus einem lichtdurchlässigen Polyesterkunststoff ohne grossen Aufwand hergestellt werden kann, ergibt sich ein sehr wirtschaftliches optisches System für einen Flammenfühler.
PATENTANSPRUCH
Flammenfühler-Anordnung zur Überwachung einer Flamme bei Gas- oder Ölbrennern, bestehend aus einem Gehäuse, enthaltend ein lichtempfindliches Element und ein optisches System zur Lichtsammlung und Fernhaltung unerwünschter Strahlungsanteile, dadurch gekennzeichnet, dass das optische System eine Fresnel-Linse ist.
UNTERANSPRÜCHE
1. Flammenfühler-Anordnung nach Patentanspruch, dadurch gekennzeichnet, dass die Fresnel-Linse aus einem Kunststoff hergestellt ist, der Strahlung mit einer Wellenlänge, die grösser als die blauen Lichtes ist, absorbiert.
2. Flammenfühler-Anordnung nach Patentanspruch, dadurch gekennzeichnet, dass die Fresnel-Linse aus Kunststoff hergestellt ist, in den optische Filterstoffe eingebettet sind, die Strahlung mit einer Wellenlänge, die grösser als die blauen Lichtes ist, absorbieren.
3. Flammenfühler-Anordnung nach Patentanspruch oder Unteranspruch 1 und/oder 2, dadurch gekennzeichnet, dass die Fresnel-Linse mit einer Strahlung mit einer Wellenlänge, die grösser als die blauen Lichtes ist, reflektierenden Oberflächenschicht versehen ist.
**WARNUNG** Ende DESC Feld konnte Anfang CLMS uberlappen**.
The invention relates to a flame sensor arrangement for monitoring a flame in gas and oil burners, consisting of a housing containing a light-sensitive element and an optical system for collecting light and keeping out undesired radiation components.
For the monitoring of oil and gas flames, flame sensors are desired which respond only to the radiation emitted directly from the flame, i.e. to its blue or near-ultraviolet radiation, while radiation lying in the red and infrared, primarily from glowing Fireclay walls, should not be recorded.
According to CH-PS 408211 an optical system in connection with an adjustable four-layer diode is known, which with an absorption filter and / or a pinhole keeps away the long-wave, undesired radiation component from the four-layer diode while at the same time collecting the desired light component.
The invention is based on the object of improving the optical system of such a sensor arrangement.
This object is achieved according to the invention in that the optical system consists of a Fresnel lens.
Fresnel lenses as such are known. They consist of centrally arranged, refractive structures that are designed as narrow circular rings. Optical systems with a very small focal length and a large aperture ratio can thus be produced because each circular ring can be optically corrected individually according to its distance from the center. This results in a high illuminance with a small overall length of the sensor arrangement.
To achieve a filter effect, the Fresnel lens can be produced from a plastic that absorbs undesirable long-wave radiation components or in which optical filter materials are embedded. The Fresnel lens is advantageously provided - expediently in addition - with a surface layer which reflects the long-wave radiation components.
The use of a Fresnel lens, which can be manufactured from a translucent polyester plastic by pressing or injection molding without great effort, results in a very economical optical system for a flame sensor.
PATENT CLAIM
Flame sensor arrangement for monitoring a flame in gas or oil burners, consisting of a housing containing a light-sensitive element and an optical system for collecting light and keeping unwanted radiation components away, characterized in that the optical system is a Fresnel lens.
SUBCLAIMS
1. Flame sensor arrangement according to claim, characterized in that the Fresnel lens is made of a plastic that absorbs radiation with a wavelength that is greater than the blue light.
2. Flame sensor arrangement according to claim, characterized in that the Fresnel lens is made of plastic, in which optical filter materials are embedded, which absorb radiation with a wavelength which is greater than the blue light.
3. Flame sensor arrangement according to claim or dependent claim 1 and / or 2, characterized in that the Fresnel lens is provided with a surface layer reflecting radiation with a wavelength that is greater than the blue light.
** WARNING ** End of DESC field could overlap beginning of CLMS **.
Claims (1)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH1391274A CH577145A5 (en) | 1974-10-17 | 1974-10-17 | Flame sensor for gas and oil burners - has fresnel lens filter or reflector for eliminating glow interference |
DE7531722U DE7531722U (en) | 1974-10-17 | 1975-10-06 | FLAME SENSOR WITH SELECTIVE SPECTRAL SENSITIVITY |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH1391274A CH577145A5 (en) | 1974-10-17 | 1974-10-17 | Flame sensor for gas and oil burners - has fresnel lens filter or reflector for eliminating glow interference |
Publications (1)
Publication Number | Publication Date |
---|---|
CH577145A5 true CH577145A5 (en) | 1976-06-30 |
Family
ID=4396412
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH1391274A CH577145A5 (en) | 1974-10-17 | 1974-10-17 | Flame sensor for gas and oil burners - has fresnel lens filter or reflector for eliminating glow interference |
Country Status (2)
Country | Link |
---|---|
CH (1) | CH577145A5 (en) |
DE (1) | DE7531722U (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4115255C2 (en) * | 1990-05-18 | 2001-07-05 | Landis & Gyr Betr S Ag Zug | Radiation sensor |
CN110836864A (en) * | 2019-10-29 | 2020-02-25 | 中国人民解放军战略支援部队航天工程大学 | Optical measuring device for measuring combustion field gas parameters |
-
1974
- 1974-10-17 CH CH1391274A patent/CH577145A5/en not_active IP Right Cessation
-
1975
- 1975-10-06 DE DE7531722U patent/DE7531722U/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4115255C2 (en) * | 1990-05-18 | 2001-07-05 | Landis & Gyr Betr S Ag Zug | Radiation sensor |
CN110836864A (en) * | 2019-10-29 | 2020-02-25 | 中国人民解放军战略支援部队航天工程大学 | Optical measuring device for measuring combustion field gas parameters |
Also Published As
Publication number | Publication date |
---|---|
DE7531722U (en) | 1976-04-15 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PL | Patent ceased |