SE421248B - DEVICE FOR SEATING AND / OR MONITORING THE FLOW SPEED OF A FLOWING MEDIUM - Google Patents
DEVICE FOR SEATING AND / OR MONITORING THE FLOW SPEED OF A FLOWING MEDIUMInfo
- Publication number
- SE421248B SE421248B SE7910485A SE7910485A SE421248B SE 421248 B SE421248 B SE 421248B SE 7910485 A SE7910485 A SE 7910485A SE 7910485 A SE7910485 A SE 7910485A SE 421248 B SE421248 B SE 421248B
- Authority
- SE
- Sweden
- Prior art keywords
- diode
- circuit
- transistor
- base
- measuring
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P13/00—Indicating or recording presence, absence, or direction, of movement
- G01P13/0006—Indicating or recording presence, absence, or direction, of movement of fluids or of granulous or powder-like substances
- G01P13/006—Indicating or recording presence, absence, or direction, of movement of fluids or of granulous or powder-like substances by using thermal variables
-
- 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
- G01P5/10—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring thermal variables
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Measuring Volume Flow (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Description
7910485-7 känselkroppen att avkylas i proportion till hastigheten till det strömmande mediet. Därigenom kommer det inbördes förhållandet mellan temperaturgivarna att ändras i proportion till det strönr mande mediets hastighet. 7910485-7 the sensing body to be cooled in proportion to the velocity of the flowing medium. Thereby, the mutual relationship between the temperature sensors will change in proportion to the speed of the flowing medium.
Genom svenska patentskriften 7314197-0 är en anordning av inledningsvis angivet slag känd. De första och andra kretsarna utgöres här av två väsentligen identiskt lika monolitiska inte- grerade kretsar i form av var sin monolitisk kristall anordnad i den värmeledande kåpan. I båda fallen utgöres diodsträckan för temperaturmätningen (temperaturgivningen) av ett antal seriekopp- lade bas-emitterdioder hos i resp. kristall integrerade transistorer.Swedish device specification 7314197-0 discloses a device of the type initially stated. The first and second circuits here consist of two substantially identical monolithic integrated circuits in the form of each monolithic crystal arranged in the heat-conducting housing. In both cases, the diode distance for the temperature measurement (temperature setting) consists of a number of series-connected base-emitter diodes of in resp. crystal integrated transistors.
Kretsorganet för uppvärmning i den första kretsen utgöres av en ytterligare integrerad transistors bas-emitterdiod driven i back- riktningen. D Denna kända anordning har visat sig mycket säker och till- förlitlig i praktiken, och avsikten med föreliggande uppfinning är att ytterligëre förbättra en anordning av denna typ i_några avseenden. ' . I En sådan förbättring har visat sig kunna uppnås på ett överraskande enkelt sätt, genom att anordningen enligt uppfinningen erhållit de i bifogade krav l angivna kännetecknen.The circuit means for heating in the first circuit consists of an additional integrated transistor base-emitter diode driven in the reverse direction. This known device has proved to be very safe and reliable in practice, and the object of the present invention is to further improve a device of this type in some respects. '. Such an improvement has been found to be achievable in a surprisingly simple manner, in that the device according to the invention has obtained the features stated in appended claims 1.
Genom att på dettafsätt förlägga uppvärmnings- och mätfunk- tionerna till en och samma individuella transistor uppnås följande fördelar utöver de som finns hos en anordning av den i ovannämnda svenska patentskrift beskrivna typen. Dessa fördelar är att l. avståndet mellan uppvärmningsstället och mätstället blir mindre än vid IC-kretsen - närmare bestämt sammanfaller de; 2. ökad snabbhet erhålles på grund av transistorns mindre massa i den värmeledande kåpan, i jämförelse med massan hos IC- kretsen vid den kända anordningen; 3. anordningen blir provningstekniskt enklare på grund' av det färre antalet anslutningar hos en transistor jämfört med en IC-krets; samt 4. transistorn är en billigare och vanligare komponent i jämförelse med IC-kretsen. l Företrädesvis, främst av mättekniska skäl, utgöres den andra kretsen av en med den första kretsens transistor identiskt 7910485-7 transistor, vars bas-emitterdiod bildar den som temperaturgivare tjänande diodsträckan. Principiellt har man som förutsättning för korrekt drift att de första och andra kretsarna skall ha samma temperaturkoefficient i drift. Förutom att välja en identisk transistor som den andra kretsen kan detta uppnås genom någon annan komponent, t.ex. en diod, under förutsättning att massan är densamma och dess mätström inställes medelst kringliggande komponenter så att temperaturkoefficienten överensstämmer med den hos basemitterdioden hos den första kretsens transistor.By placing the heating and measuring functions in one and the same individual transistor in this way, the following advantages are achieved in addition to those found in a device of the type described in the above-mentioned Swedish patent specification. These advantages are that l. The distance between the heating point and the measuring point becomes smaller than at the IC circuit - more precisely, they coincide; 2. increased velocity is obtained due to the smaller mass of the transistor in the thermally conductive housing, in comparison with the mass of the IC circuit of the known device; 3. the device becomes technically simpler due to the smaller number of connections of a transistor compared to an IC circuit; and 4. the transistor is a cheaper and more common component compared to the IC circuit. Preferably, mainly for metrological reasons, the second circuit consists of a transistor identical to the transistor of the first circuit, the base-emitter diode of which forms the diode section serving as a temperature sensor. In principle, the prerequisite for correct operation is that the first and second circuits must have the same temperature coefficient in operation. In addition to selecting an identical transistor as the second circuit, this can be achieved by any other component, e.g. a diode, provided that the mass is the same and its measuring current is set by means of surrounding components so that the temperature coefficient corresponds to that of the basemitter diode of the transistor of the first circuit.
Uppfinningen skall nu beskrivas närmare nedan med hänvis- ning till bifogade ritningar, på vilka fig. 1 - 3 visar princip- kopplingsschemor för tre utföringsformer.The invention will now be described in more detail below with reference to the accompanying drawings, in which Figs. 1-3 show principle diagrams for three embodiments.
T3 och T4 är två identiska transistorer, vilkas baselek- troder erhåller samma spänningsnivå från en spänningsdelare R3l, R32 ansluten till en stabiliserad matningsspänning E. Transis~ torns T3 kollektor är ansluten till spänningen E, medan kollektorn hos T4 saknar anslutning. De båda transistorernas emitterelek- troder är anslutna till en jämförelsekrets IC 2.T3 and T4 are two identical transistors, the base electrodes of which receive the same voltage level from a voltage divider R31, R32 connected to a stabilized supply voltage E. The collector of the transistor T3 is connected to the voltage E, while the collector of T4 has no connection. The emitter electrodes of the two transistors are connected to a comparator circuit IC 2.
Det yttre arrangemanget för denna schematiskt beskrivna krets kan vara detsamma som vid mätanordningen enligt den ovan- nämnda svenska patentskriften 7314197-0. Transistorerna T3 och T4 ersätter sålunda de båda av monolitiska kristaller bestående känselkropparna i denna kända anordning och är liksom dessa in- kapslade 1 var sin väl värmeledande kåpa och anordnade på det sätt som framgår av figur l i nämnda patentskrift. Med för fack- mannen självklara ändringar med avseende på anslutningar och dylikt kan den på ritningen visade kretsen ingå i en större krets av det slag som framgår av den nämnda patentskriften i och för utförande av samma funktioner. Exempel härpå framgår av fig. 3, i vilken komponenterna erhållit samma hänvisningsbeteckninar som motsvarande eller likartade komponenter i fig. 3 i nämnda patentskrift. Med IC3 erhålles konstant belastningsokänslig spännings- delning.The external arrangement of this schematically described circuit may be the same as with the measuring device according to the above-mentioned Swedish patent specification 7314197-0. The transistors T3 and T4 thus replace the two sensory bodies consisting of monolithic crystals in this known device and, like these, are each encapsulated in a heat-conducting housing and arranged in the manner shown in Figure 1 of the said patent specification. With obvious changes for the person skilled in the art with regard to connections and the like, the circuit shown in the drawing can be included in a larger circuit of the type which appears from the said patent specification in order to perform the same functions. Examples of this are shown in Fig. 3, in which the components have received the same reference numerals as corresponding or similar components in Fig. 3 of the said patent specification. With IC3, constant load-insensitive voltage division is obtained.
Vid den visade utföringsformen tjänar transistorernas T3 och T4 bas-emitterdioder som temperaturgivare med samma temperaturkoefficient i drift. Kollektor-emittersträckan hos transistorn T3 matas med en konstant spänning, varigenom en konstant effekt över translatorn erhålles. Värdet hos motståndetIn the embodiment shown, the base-emitter diodes of the transistors T3 and T4 serve as temperature sensors with the same temperature coefficient in operation. The collector-emitter distance of the transistor T3 is supplied with a constant voltage, whereby a constant power across the translator is obtained. The value of the resistor
Claims (5)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE7910485A SE421248B (en) | 1979-12-19 | 1979-12-19 | DEVICE FOR SEATING AND / OR MONITORING THE FLOW SPEED OF A FLOWING MEDIUM |
GB8039944A GB2065894B (en) | 1979-12-19 | 1980-12-12 | Device for measuring the flow velocity of a fluid |
DE19803048096 DE3048096A1 (en) | 1979-12-19 | 1980-12-19 | DEVICE FOR MEASURING AND / OR MONITORING THE FLOW RATE OF A FLOWING MEDIUM |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE7910485A SE421248B (en) | 1979-12-19 | 1979-12-19 | DEVICE FOR SEATING AND / OR MONITORING THE FLOW SPEED OF A FLOWING MEDIUM |
Publications (2)
Publication Number | Publication Date |
---|---|
SE7910485L SE7910485L (en) | 1981-06-20 |
SE421248B true SE421248B (en) | 1981-12-07 |
Family
ID=20339600
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SE7910485A SE421248B (en) | 1979-12-19 | 1979-12-19 | DEVICE FOR SEATING AND / OR MONITORING THE FLOW SPEED OF A FLOWING MEDIUM |
Country Status (3)
Country | Link |
---|---|
DE (1) | DE3048096A1 (en) |
GB (1) | GB2065894B (en) |
SE (1) | SE421248B (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3527868A1 (en) * | 1985-08-02 | 1987-02-12 | Schmidt Feintechnik Gmbh | METHOD AND MEASURING PROBE FOR PROBING THE LEVEL OF THE MASS CURRENT, THE FLUID TYPE, THE FLUID COMPOSITION OR THE LIKE IN A CONTAINER, PIPE OR THE LIKE CONTAINING ONE OR MORE FLUIDS |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2871376A (en) * | 1953-12-31 | 1959-01-27 | Bell Telephone Labor Inc | Temperature sensitive transistor control circuit |
US3219843A (en) * | 1962-10-24 | 1965-11-23 | Ball Brothers Res Corp | Temperature transducer |
CA995483A (en) * | 1973-02-16 | 1976-08-24 | Her Majesty The Queen In Right Of Canada As Represented By The Minister Of National Defence Of Her Majesty's Canadian Government | Transistor anemometer |
FR2248512A1 (en) * | 1973-10-19 | 1975-05-16 | Anvar | Fluid flow anemometer - has a transistor sensor and ambient temperature change compensation |
SE391036B (en) * | 1973-12-03 | 1977-01-31 | Elektronik Konstruktions Ab | DEVICE FOR SATURATION AND / OR MONITORING THE FLOW SPEED OF A FLOWING MEDIUM |
DE2805905A1 (en) * | 1978-02-13 | 1979-08-16 | Manfred Ing Grad Greve | Linear semiconductor temp. sensor - has sensing transistor shunted by voltage divider with tap coupled to base |
-
1979
- 1979-12-19 SE SE7910485A patent/SE421248B/en not_active IP Right Cessation
-
1980
- 1980-12-12 GB GB8039944A patent/GB2065894B/en not_active Expired
- 1980-12-19 DE DE19803048096 patent/DE3048096A1/en not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
GB2065894B (en) | 1983-07-06 |
GB2065894A (en) | 1981-07-01 |
DE3048096A1 (en) | 1981-09-24 |
SE7910485L (en) | 1981-06-20 |
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