DE838789C - Measuring amplifier - Google Patents
Measuring amplifierInfo
- Publication number
- DE838789C DE838789C DEF1589A DEF0001589A DE838789C DE 838789 C DE838789 C DE 838789C DE F1589 A DEF1589 A DE F1589A DE F0001589 A DEF0001589 A DE F0001589A DE 838789 C DE838789 C DE 838789C
- Authority
- DE
- Germany
- Prior art keywords
- moving coil
- current
- photocell
- coil device
- measuring
- 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
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
- G01F1/36—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
- G01F1/363—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction with electrical or electro-mechanical indication
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Fluid Pressure (AREA)
Description
Die Erfindung betrifft einen Photozellenmeßverstärker mit vorgeschaltetem Drehspulgerät, bei dem der Lichtstrom zur Photozelle durch den Zeigerausschlag des Drehspulgerätes gesteuert wird. Sie hat den Zweck, vorgegebene Meßgleichstromwerte in registrierbare, diesen wurzelproportionale Anzeigegleichstromwerte umzuwandeln. The invention relates to a photocell measuring amplifier with an upstream Moving coil device in which the luminous flux to the photocell is generated by the pointer deflection of the Moving coil device is controlled. Its purpose is to provide predetermined measurement direct current values to convert them into registrable, these root-proportional display direct current values.
Dies wird erfindungsgemäß dadurch erreicht, daß der Anodenstrom des Photozellenmeßverstärkers vermittels eines Elektromagneten über einen mit dem Zeiger des Drehspulgerätes starr verbundenen magnetisierbaren Körper auf das Drehspulgerät in der Weise einwirkt, daß der vom Meßstrom hervorgerufene Ausschlag praktisch vollkommen kompensiert wird. This is achieved according to the invention in that the anode current of the Photocell measuring amplifier by means of an electromagnet via a with the pointer of the moving coil device rigidly connected magnetizable body to the moving coil device acts in such a way that the deflection caused by the measuring current is practically perfect is compensated.
Durch diese Art der Kompensation wird eine Radizierung des Meßstromes erreicht unter Ausnutzung der physikalischen Gesetzmäßigkeit, daß die magnetische Kraft eines Elektromagneten proportional dem Quadrat des elektrischen Stromes ist. This type of compensation results in a root extraction of the measuring current achieves by utilizing the physical laws that the magnetic The force of an electromagnet is proportional to the square of the electric current.
Der Radiziervorgang sei an Hand des Prinzipscbaltbiides beispielsweise beschrieben: In den Anodenstrornkreis 1 einer durch eine Photozelle 2 gesteuerten Verstärkerröhre 3 ist eine Spule 4 in Serie mit einem Anzeigegerät 5 geschaltet. Dem Photozellenverstärker 3 ist ein Drehspulinstrument 6 vorgeschaltet, an dessen Drehspule 7 zwei starre Arme 8 und 9 befestigt sind. The root extraction process is based on the principle diagram, for example described: In the anode circuit 1 of a controlled by a photocell 2 Amplifier tube 3, a coil 4 is connected in series with a display device 5. The photocell amplifier 3 is preceded by a moving coil instrument 6, on which Moving coil 7 two rigid arms 8 and 9 are attached.
Der Arm 8 trägt an seinem Ende die Blende IO und der Arm g an seinem Ende einen magnetisierbaren Körper II, der in die ringförmige Spule 4 frei beweglich hineinragt.The arm 8 carries the cover IO at its end and the arm g on his End of a magnetizable body II, which is freely movable in the annular coil 4 protrudes.
Der Vorgang der Kompensation spielt sich folgendermaßen ab: Die Arme 8 und 9 des Drehspulinstruments 6 erfahren durch einen Meßstrom I einen diesem proportionalen Ausschlag al. Dieser Ausschlag bewirkt eine Lageänderung der Blende 10 und damit eine mehr oder weniger starke Abdeckung des von der Lampe 12 auf die Photozelle treffenden Lichtstromes. Es fließt ein diesem Lichtstrom entsprechender Anodenstrom I2 durch die Spule 4 sowie durch das Anzeigegerät 5, der gleichzeitig über die Spule 4 und den magnetisierbaren Körper 1 1 auf den Arm 9 des Drehspulgerätes 6 eine dem Quadrat der Anodenstromstärke 12 proportionale Kraft ausübt, die einen dem Meßstromausschlag a1 entgegengerichteten Ausschlag z2 bewirkt. Macht man diese Gegenkopplung stark genug, was im wesentlichen von der Windungszahl der Spule 4 abhängt, so wird der ursprünglich durch den Meßstrom hervorgerufene Drehspulausschlag praktisch vollkommen kompensiert. Man erhält auf diese Weise zwischen Strom I1 (Meßstrom) und I2 (Anzeigestrom) die gewünschte wurzelproportionale Abhängigkeit: I2= ßÄ wobei C eine Konstante ist. The process of compensation takes place as follows: The arms 8 and 9 of the moving-coil instrument 6 experience a measuring current I proportional to this Rash al. This deflection causes a change in position of the diaphragm 10 and thus a more or less strong cover of the lamp 12 on the photocell appropriate luminous flux. An anode current corresponding to this luminous flux flows I2 through the coil 4 as well as through the display device 5, which is simultaneously over the coil 4 and the magnetizable body 1 1 on the arm 9 of the moving coil device 6 a dem Square of the anode current strength 12 exerts a force proportional to the measuring current deflection a1 causes the opposite deflection z2. Make this negative feedback strong enough, which depends essentially on the number of turns of the coil 4, so the Moving coil deflection originally caused by the measuring current is practically perfect compensated. In this way you get between current I1 (measuring current) and I2 (display current) the desired root-proportional dependency: I2 = ßÄ where C is a constant.
Der radizierende Meßverstärker kann beispielsweise mit besonderem Vorteil zur Durchflußmessung strömender Medien benutzt werden. Der Differenzdruck an einer Stauscheibe wird über eine Selbstinduktionswiderstandsmeßbrücke vermittels eines Federmembranmanometers in einen dem Differenzdruck proportionalen Strom verwandelt. Bekanntlich ist die Durchflußmenge proportional der Quadratwurzel des Differenzdruckes, also auch proportional der Quadratwurzel des Brückenstromes. Der Brückenstrom wird nun nach der gemäß der Erfindung angegebenen Schaltung radiziert, so daß er proportional der Durchflußmenge ist. Er kann mittels Schreiber registriert und/oder mittels Stromzähler integriert werden. Infolge der geringen Einstellträgheit (etwa 5 Sek.) können unter Verwendurtg des Umschaltwerkes eines Mchrfachschreihers mehrere induktive oder ähnliche Differenzdruckdosen an den gleichen radizierenden Meßverstärker angeschaltet und die verschiedenen Durchflußmengen auf dem genannten Mehrfachschreiber registriert werden. The square root measuring amplifier can, for example, with special Advantageously, they can be used to measure the flow rate of flowing media. The differential pressure at a baffle plate is mediated via a self-induction resistance measuring bridge a spring diaphragm manometer is converted into a current proportional to the differential pressure. As is well known, the flow rate is proportional to the square root of the differential pressure, thus also proportional to the square root of the bridge current. The bridge current will now square rooted according to the circuit specified according to the invention, so that it is proportional the flow rate is. It can be registered by means of a recorder and / or by means of an electricity meter to get integrated. As a result of the low setting inertia (approx. 5 seconds), under Use of the switching mechanism of a multiple recorder, inductive or similar Differential pressure cells connected to the same square root measuring amplifier and the various flow rates are recorded on the multiple recorder mentioned will.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEF1589A DE838789C (en) | 1950-06-01 | 1950-06-01 | Measuring amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEF1589A DE838789C (en) | 1950-06-01 | 1950-06-01 | Measuring amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE838789C true DE838789C (en) | 1952-05-12 |
Family
ID=7082945
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEF1589A Expired DE838789C (en) | 1950-06-01 | 1950-06-01 | Measuring amplifier |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE838789C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1118319B (en) * | 1956-07-17 | 1961-11-30 | Kelvin & Hughes Ltd | Arrangement for the automatic control of a physical quantity |
-
1950
- 1950-06-01 DE DEF1589A patent/DE838789C/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1118319B (en) * | 1956-07-17 | 1961-11-30 | Kelvin & Hughes Ltd | Arrangement for the automatic control of a physical quantity |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE838789C (en) | Measuring amplifier | |
| DE813898C (en) | Flow meter | |
| DE823354C (en) | Device for controlling the display or printing mechanism of scales and similar measuring instruments | |
| DE1047461B (en) | Flow monitoring device | |
| DE611828C (en) | Stress and performance meter | |
| DE559818C (en) | Device for measuring the speed and amount of flowing media | |
| DE708180C (en) | Arrangement for amplifying electrical currents or voltages with a bolometer arrangement controlled by an electrical measuring mechanism | |
| DE681137C (en) | Device for measuring the difference quotient of the characteristics of lawful electrical processes | |
| DE892478C (en) | Galvanometer with crossed, fixed coils, which influence a magnetic body attached to the pointer axis | |
| DE1955496B2 (en) | PRESSURE TRANSDUCER | |
| DE478874C (en) | Magnet-electric pointer measuring device | |
| DE338678C (en) | Current direction indicator | |
| DE737247C (en) | Device for forming the sum or the difference between two measured quantities | |
| DE445188C (en) | Stand for an electrical telemetry device | |
| DE892579C (en) | Short timer for determining high starting speeds | |
| DE954361C (en) | Bolometer arrangement | |
| DE339152C (en) | Device for measuring the instantaneous value and the time integral of pressures, forces or speeds by means of an ammeter and a counter | |
| DE733226C (en) | Device for determining the acceleration due to gravity | |
| AT233666B (en) | Measuring transducer with automatic compensation through torque comparison | |
| DE972386C (en) | Device for measuring paramagnetic components in gas mixtures | |
| DE713421C (en) | Peak counter with hysteresis inhibition | |
| DE490370C (en) | Automatic switch-on device for radio tube sets | |
| DE602546C (en) | Device for displaying, registering and counting the peak values of the consumption of flowing media | |
| DE575560C (en) | Device to compensate the temperature error of Ferrari measuring devices with the help of a bimetal strip | |
| DE655566C (en) | Arrangement for actuating an electromagnetic relay through a contact element with a very low leveling force |