AT1157U1 - METHOD FOR THE OPTICAL MEASUREMENT OF GAS BUBBLES IN A COOLANT - Google Patents
METHOD FOR THE OPTICAL MEASUREMENT OF GAS BUBBLES IN A COOLANT Download PDFInfo
- Publication number
- AT1157U1 AT1157U1 AT0068495U AT68495U AT1157U1 AT 1157 U1 AT1157 U1 AT 1157U1 AT 0068495 U AT0068495 U AT 0068495U AT 68495 U AT68495 U AT 68495U AT 1157 U1 AT1157 U1 AT 1157U1
- Authority
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- Austria
- Prior art keywords
- light
- coolant
- gas bubbles
- measurement
- probe
- Prior art date
Links
- 238000005259 measurement Methods 0.000 title claims description 11
- 238000000034 method Methods 0.000 title claims description 9
- 239000002826 coolant Substances 0.000 title claims description 8
- 230000003287 optical effect Effects 0.000 title claims description 6
- 239000000523 sample Substances 0.000 claims description 19
- 230000005855 radiation Effects 0.000 claims description 9
- 239000000498 cooling water Substances 0.000 claims description 8
- 238000002485 combustion reaction Methods 0.000 claims description 5
- 239000000110 cooling liquid Substances 0.000 claims description 4
- 238000011156 evaluation Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 6
- 239000000835 fiber Substances 0.000 description 4
- 101000927062 Haematobia irritans exigua Aquaporin Proteins 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/18—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the time taken to traverse a fixed distance
- G01P5/20—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the time taken to traverse a fixed distance using particles entrained by a fluid stream
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- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Description
AT 001 157 UlAT 001 157 ul
Die Erfindung betrifft ein Verfahren zur optischen Messung von Gasblasen in der Kühlflüssigkeit einer Brennkraftmaschine, wobei über zumindest einen Emitter Licht in die Kühlflüssigkeit gestrahlt und der auf Grund der Gasblasen auf-tretende Streulichtanteil bzw. die Intensitätsänderung einer in die Kühlflüssigkeit emittierten Lichtstrahlung durch einen Sensor gemessen wird, sowie eine Einrichtung zur Durchführung dieses Verfahrens.The invention relates to a method for the optical measurement of gas bubbles in the cooling liquid of an internal combustion engine, light being radiated into the cooling liquid via at least one emitter and the scattered light component occurring due to the gas bubbles or the change in intensity of light radiation emitted into the cooling liquid being measured by a sensor as well as a facility for carrying out this method.
Die Größe, Anzahl und Geschwindigkeit von Dampfblasen im Kühlmittel einer Brennkraftmaschine hat einen wesentlichen Einfluß auf die Kühlleistung des Kühlkreislaufes.The size, number and speed of vapor bubbles in the coolant of an internal combustion engine have a significant influence on the cooling capacity of the cooling circuit.
Es sind verschiedene Einrichtungen und Verfahren zur optischen Detektion von Gasblasen in Flüssigkeiten bekannt. Die EP 0 289 833 A2 beschreibt ein Verfahren und eine Einrichtung, bei der über eine Lichtquelle Licht radial in das Innere eines Rohres gestrahlt wird. Die Achse des Lichtsensors ist zur Achse des eingestrahlten Lichtes um einen Winkel geneigt angeordnet, sodaß der Lichtsensor nur in Anwesenheit von Luftblasen Streulicht registriert. Eine ähnliche Einrichtung ist weiters auch aus der GB 2 248 927 A bekannt. Diese bekannten Einrichtungen eignen sich allerdings nur zur reinen Registrierung von Blasen und nicht zur Geschwindigkeitsmessung der Blasen.Various devices and methods for the optical detection of gas bubbles in liquids are known. EP 0 289 833 A2 describes a method and a device in which light is radiated radially into the interior of a tube via a light source. The axis of the light sensor is arranged at an angle to the axis of the incident light, so that the light sensor registers scattered light only in the presence of air bubbles. A similar device is also known from GB 2 248 927 A. However, these known devices are only suitable for the pure registration of bubbles and not for measuring the speed of the bubbles.
Aufgabe der vorliegenden Erfindung ist es, eine Meßeinrichtung und ein Meßverfahren zur Messung der Geschwindigkeit von Gasblasen in Kühlflüssigkeiten bereitzustellen.The object of the present invention is to provide a measuring device and a measuring method for measuring the velocity of gas bubbles in cooling liquids.
Erfindungsgemäß wird dies dadurch erreicht, daß der Streulichtanteil bzw. die Intensitätsänderung in zumindest zwei räumlich benachbarten Bereichen gemessen wird und daß die Blasengeschwindigkeit aus der Wegzeitdifferenz der Meßsignale ermittelt wird. Dazu ist vorgesehen, daß zumindest zwei Lichtleiter zur Messung der Streulichtsignale räumlich distanziert über zumindest eine Sonde in den Kühlwasserkanal einmünden.According to the invention, this is achieved in that the scattered light component or the change in intensity is measured in at least two spatially adjacent areas and in that the bubble velocity is determined from the path-time difference of the measurement signals. For this purpose, it is provided that at least two light guides for measuring the scattered light signals open into the cooling water channel in a spatially distant manner via at least one probe.
Eine bevorzugte Ausbildung der Erfindung sieht vor, daß die zumindest zwei Lichtleiter zur Messung der Streulicht-bzw. Intensitätsänderungssignale in einer einzigen Sonde angeordnet sind.A preferred embodiment of the invention provides that the at least two light guides for measuring the scattered light or. Intensity change signals are arranged in a single probe.
Gemäß einer erfindungsgemäßen Ausführung wird dabei das Licht über zumindest eine in den Kühlwasserkanal einge- 2 AT 001 157 Ul führte Sonde emittiert. Emissionssonde und Meßsonde können dabei verschieden oder identisch sein.According to an embodiment of the invention, the light is emitted via at least one probe guided into the cooling water channel. Emission probe and measuring probe can be different or identical.
Wird das Licht über eine externe Lichtquelle in einer Meßsonde zugeführt, so kann vorgesehen sein, daß Lichtemission und Messung über einen monophilen Lichtleiter erfolgt, wobei im Lichtleiter ein Strahlteiler angeordnet ist. Die Zuführung des Lichtes und die Abführung des gemessenen Streulichtes erfolgt dabei über ein und denselben Lichtleiter.If the light is supplied via an external light source in a measuring probe, it can be provided that light emission and measurement take place via a monophilic light guide, a beam splitter being arranged in the light guide. The light is supplied and the measured scattered light is removed via one and the same light guide.
Weiters kann vorgesehen sein, daß statt einer monophilen Faser und eines Strahlteilers ein zweiarmiger Lichtleiter verwendet wird.It can also be provided that a two-armed light guide is used instead of a monophilic fiber and a beam splitter.
In einer besonders vorteilhaften Ausführung der Erfindung ist vorgesehen, daß der Streulichtanteil einer Hintergrundstrahlung im Infrarotbereich gemessen wird. Die Hintergrundstrahlung im Infrarotbereich wird dabei von den Motorbetriebstemperatur aufweisenden Wänden des Kühlflüssigkeitskanales gebildet. Dies ermöglicht es, auf eine externe Lichtquelle zu verzichten und statt dessen die Wärmestrahlung der Brennkraftmaschine zu verwenden.In a particularly advantageous embodiment of the invention it is provided that the scattered light component of a background radiation is measured in the infrared range. The background radiation in the infrared range is formed by the walls of the coolant channel having the engine operating temperature. This makes it possible to dispense with an external light source and instead to use the heat radiation from the internal combustion engine.
Die Erfindung wird anhand der Figuren näher erläutert .The invention is explained in more detail with reference to the figures.
Es zeigen schematisch Fig. 1 eine erfindungsgemäße Einrichtung mit einer in einen Kühlflüssigkeitskanal eingeführten Meßlicht- und einer Sensorsonde, Fig. 2 bis 5 weitere Ausführungsvarianten der Erfindung mit einer kombinierten Meßlicht- und Sensorsonde, Fig. 6 eine Ansicht auf eine Sonde gemäß der Linie VI-VI in Fig. 5.1 schematically shows a device according to the invention with a measuring light and sensor probe inserted into a coolant channel, FIGS. 2 to 5 further embodiment variants of the invention with a combined measuring light and sensor probe, FIG. 6 shows a view of a probe along line VI -VI in Fig. 5.
Bei der in Figur 1 gezeigten Ausführungsvariante mündet die Meßeinrichtung 2, bestehend aus einem Emitter 2a, einem Sensor 2b und 2b', in den Kühlwasserkanal 1, wobei Emitter 2a und Sensoren 2b, 2b' durch räumlich getrennte Sonden 9a, 9b, 9b' gebildet sind. Der in den Kühlwasserkanal 1 gestrahlte Lichtkegel ist mit 3 bezeichnet. Die Sensoren 2b, 2b' sind so angeordnet, daß sich der Meßkegel 4, 4' mit dem Strahlkegel 3 überlappt und das durch Gasblasen 5 verursachte Streulicht empfängt. Der Streulichtanteil ist ein Maß für die Größe und Anzahl der Gasblasen.In the embodiment shown in Figure 1, the measuring device 2, consisting of an emitter 2a, a sensor 2b and 2b ', opens into the cooling water channel 1, emitter 2a and sensors 2b, 2b' being formed by spatially separate probes 9a, 9b, 9b ' are. The light cone radiated into the cooling water channel 1 is denoted by 3. The sensors 2b, 2b 'are arranged such that the measuring cone 4, 4' overlaps the beam cone 3 and receives the scattered light caused by gas bubbles 5. The amount of scattered light is a measure of the size and number of gas bubbles.
Zur Messung der Blasengeschwindigkeit wird die Wegzeitdifferenz von bestimmten Blasen 5 oder Blasengruppen gemessen. Dazu werden zumindest zwei in einem Abstand 15 voneinander entfernte Lichtleiter 7, 7' bzw. 10, 10' verwendet, wo- 3 AT 001 157 Ul bei die Lichtleiter gemäß Fig. l in separaten Sonden 9b, 9b' angeordnet, bzw. wie in Fig. 5 gezeigt, in einer Sonde 9 integriert sein können. Aus der Zeitverzögerung der Streulichtsignale aus dem ersten Lichtleiter 10 und dem zweiten Lichtleiter 10' und dem Abstand 15 wird die Geschwindigkeit der Blasen bestimmt.To measure the bubble velocity, the travel time difference of certain bubbles 5 or bubble groups is measured. For this purpose, at least two light guides 7, 7 'or 10, 10' spaced 15 apart from each other are used, of which the light guides according to FIG. 1 are arranged in separate probes 9b, 9b ', or as in FIG 5, can be integrated in a probe 9. The speed of the bubbles is determined from the time delay of the scattered light signals from the first light guide 10 and the second light guide 10 'and the distance 15.
Gegebenenfalls kann auf eine externe Lichtquelle auch verzichtet werden, wenn der Sensor 2b als Infrarotsensor aus-gebildet ist und als Emitter die Kanalwände la der Kühlwasserkanäle 1 dienen, also als Strahlungsquelle die Abwärme des Motors verwendet wird. Als Meßsignal kann dabei die Intensitätsänderung der Hintergrundstrahlung oder die durch die Blasen verursachten Streulichtanteile der Infrarotstrahlung herangezogen werden.If necessary, an external light source can also be dispensed with if the sensor 2b is designed as an infrared sensor and the channel walls la of the cooling water channels 1 serve as emitters, ie the waste heat from the motor is used as the radiation source. The change in intensity of the background radiation or the scattered light components of the infrared radiation caused by the bubbles can be used as the measurement signal.
Wie in Fig. 2 gezeichnet^ können die Lichtleiter^ und 7 des Emitters und des Sensors in einer einzigen Sonde 9 und dabei die Achsen des Strahlkegels 3 und des Meßkegels 4 etwa parallel zueinander angeordnet sein. Zur Messung der Geschwindigkeit sind zwei in Strömungsrichtung distanziert voneinander angeordnete Sonden 9 erforderlich.As shown in Fig. 2 ^ the light guide ^ and 7 of the emitter and the sensor in a single probe 9 and thereby the axes of the beam cone 3 and the measuring cone 4 can be arranged approximately parallel to each other. To measure the speed, two probes 9, spaced apart from one another in the flow direction, are required.
Eine weitere Vereinfachung der Meßeinrichtung 2 ist in Fig. 3 gezeigt. Die Sonde 9 weist dabei einen einzigen Lichtleiter auf, der beispielsweise eine monophile Faser 10 sein kann. Über einen Strahlteiler 11 wird Licht einerseits von einer Lichtquelle 12 in den Lichtleiter 10 geleitet, andererseits Meßlicht aus dem Lichtleiter 10 einem Fotosensor 13, beispielsweise Fotodioden oder Fotomultiplier, zugeführt.A further simplification of the measuring device 2 is shown in FIG. 3. The probe 9 has a single light guide, which can be a monophilic fiber 10, for example. Via a beam splitter 11, light is guided on the one hand from a light source 12 into the light guide 10, and on the other hand measurement light from the light guide 10 is fed to a photo sensor 13, for example photo diodes or photo multipliers.
Zur Abgrenzung des Meßbereiches kann an der Mündung der Sonde 9 in den Kühlwasserkanal 1 eine Front linse 14 angebracht sein, wie in Fig. 4 angedeutet ist.To delimit the measuring range, a front lens 14 can be attached to the mouth of the probe 9 in the cooling water channel 1, as indicated in Fig. 4.
Anstelle einer monophilen Faser 10 und eines Strahl-teilers 11 ist auch die Verwendung eines zweiarmigen Lichtleiters denkbar.Instead of a monophilic fiber 10 and a beam splitter 11, the use of a two-armed light guide is also conceivable.
In einem praktischen Ausführungsbeispiel können - wie in Fig.. 6 ersichtlich ist - beispielsweise vier Fasern in einem 4-Kanalsensor vorgesehen sein, wobei die Signalauswertung zur Bestimmung der Zeitverzögerung über eine Kreuzkorrelation erfolgt. 4In a practical exemplary embodiment, as can be seen in FIG. 6, four fibers can be provided in a 4-channel sensor, for example, the signal evaluation for determining the time delay taking place via a cross correlation. 4th
Claims (8)
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT0068495U AT1157U1 (en) | 1995-12-15 | 1995-12-15 | METHOD FOR THE OPTICAL MEASUREMENT OF GAS BUBBLES IN A COOLANT |
| DE19651485A DE19651485C2 (en) | 1995-12-15 | 1996-12-11 | Method for the optical measurement of gas bubbles in the cooling liquid of an internal combustion engine and a device for carrying out the method |
| US08/764,128 US5864392A (en) | 1995-12-15 | 1996-12-12 | Method for optically detecting gas bubbles moving in a coolant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT0068495U AT1157U1 (en) | 1995-12-15 | 1995-12-15 | METHOD FOR THE OPTICAL MEASUREMENT OF GAS BUBBLES IN A COOLANT |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AT1157U1 true AT1157U1 (en) | 1996-11-25 |
Family
ID=3497092
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AT0068495U AT1157U1 (en) | 1995-12-15 | 1995-12-15 | METHOD FOR THE OPTICAL MEASUREMENT OF GAS BUBBLES IN A COOLANT |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US5864392A (en) |
| AT (1) | AT1157U1 (en) |
| DE (1) | DE19651485C2 (en) |
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| DE3579124D1 (en) * | 1984-12-04 | 1990-09-13 | Dow Chemical Co | FIBER OPTICAL PROBE AND METHOD FOR DETERMINING THE SIZE AND / OR CONCENTRATION OF SUBSTANCES IN A SUSPENSION. |
| US4659218A (en) * | 1985-05-23 | 1987-04-21 | Canadian Patents & Development Corporation | Multi-probe system for measuring bubble characteristics gas hold-up, liquid hold-up and solid hold-up in a three-phase fluidized bed |
| US4662749A (en) * | 1985-11-08 | 1987-05-05 | Massachusetts Institute Of Technology | Fiber optic probe and system for particle size and velocity measurement |
| US4859864A (en) * | 1987-05-07 | 1989-08-22 | Becton, Dickinson And Company | Sensor and method for detecting the presence of air bubbles in liquid |
| US4978863A (en) * | 1988-09-06 | 1990-12-18 | The Dow Chemical Company | Method and apparatus for fiber optic backscattered light measurement to determine flow rates of multi-phase streams |
| FR2667689B1 (en) * | 1990-10-04 | 1994-08-05 | Saint Gobain Isover | MEASUREMENT OF THE FLOW OF A FILLET OF MOLTEN MATERIAL. |
-
1995
- 1995-12-15 AT AT0068495U patent/AT1157U1/en not_active IP Right Cessation
-
1996
- 1996-12-11 DE DE19651485A patent/DE19651485C2/en not_active Expired - Fee Related
- 1996-12-12 US US08/764,128 patent/US5864392A/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2011733A1 (en) * | 1969-03-13 | 1970-10-15 | ||
| GB1373813A (en) * | 1971-04-23 | 1974-11-13 | Lucas Industries Ltd | Apparatus for detecting the presence of a bubble in a flowing liquid |
| US5033858A (en) * | 1990-02-26 | 1991-07-23 | Westinghouse Electric Corp. | Detection of contaminants in a liquid stream |
| GB2248927A (en) * | 1990-10-17 | 1992-04-22 | Danby Medical Ltd | Device for detecting air in fluid |
Also Published As
| Publication number | Publication date |
|---|---|
| DE19651485C2 (en) | 2001-05-31 |
| DE19651485A1 (en) | 1997-06-19 |
| US5864392A (en) | 1999-01-26 |
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| Date | Code | Title | Description |
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| MM9K | Lapse due to non-payment of renewal fee |