DE892683C - Method for the electrical measurement of physical quantities - Google Patents
Method for the electrical measurement of physical quantitiesInfo
- Publication number
- DE892683C DE892683C DEC4355A DEC0004355A DE892683C DE 892683 C DE892683 C DE 892683C DE C4355 A DEC4355 A DE C4355A DE C0004355 A DEC0004355 A DE C0004355A DE 892683 C DE892683 C DE 892683C
- Authority
- DE
- Germany
- Prior art keywords
- electrical measurement
- physical quantities
- encoder
- physical
- stage
- 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
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/30—Structural combination of electric measuring instruments with basic electronic circuits, e.g. with amplifier
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
Description
Verfahren zur elektrischen Messung physikalischer Größen Die Erfindung betrifft eine Schaltungsanordnung mit Elektronenröhren, die es erlaubt, vermittels kapazitiver oder induktiver Geber physikalische Größen, wie Druck, Zug, Weg oder andere unabhängig von elektrischen oder magnetischen Störfeldern, zu messen oder zu registrieren.Method for electrical measurement of physical quantities The invention relates to a circuit arrangement with electron tubes, which allows mediating capacitive or inductive encoder physical quantities such as pressure, tension, travel or others independent of electrical or magnetic interference fields, to measure or to register.
Es sind bereits Verfahren zur elektrischen Messung physikalischer Größen bekannt, bei denen durch Geber die Amplitude eines elektrischen Stromes oder einer Spannung geändert wird, so daß diese ein Maß für die physikalische Größe darstellt. Allen Verfahren, bei denen am Geber durch Änderungen der physikalischen Meßgröße Amplitudenänderungen von Strom oder Spannung auftreten, haftet jedoch der grundsätzliche Nachteil an, daß Störamplituden in vollem Maße das Meßergebnis fälschen, so daß oftumständliche Abschirmungsmaßnahmen zu ihrer Unterdrückung erforderlich sind.Methods for electrical measurement are already more physical Sizes known in which the amplitude of an electric current or by encoder a voltage is changed so that this represents a measure of the physical quantity. All processes in which changes in the physical measured variable are made on the encoder Changes in amplitude of current or voltage occur, but the fundamental one is liable Disadvantage that interference amplitudes falsify the measurement result in full, so that often cumbersome shielding measures are necessary to suppress them.
Dieser Nachteil kann vermieden, werden, wenn am Geber durch den Einfluß der physikalischen Meßgröße Frequenzänderungen nachträglich wieder inAmplitudenänderungen,umgesetztwerden. Solche Verfahren sind ebenfalls bekannt, aber auch sie bieten keinen Schutz gegen Störeinflüsse, da keine Maßnahmen. zur Unterdrückung von Störamplituden getroffen werden.This disadvantage can be avoided if on the encoder by the influence the physical measured variable frequency changes are subsequently converted back into amplitude changes. Such methods are also known, but they also offer no protection against Interferences, as no measures are taken. taken to suppress interference amplitudes will.
Die erfindungsgemäßeAnordnungbeseitigt jedoch jede Fälschung des Meßergebnisses durch ungewollte Amplitudenänderungen, indem zwischen dem durch den Geber frequenzmodulierten Oszillator und dem Demodulator eine Begrenzerstufe eingeschaltet wird, hinter der die Meßspannungsamplitude einen niedrigeren, konstanten Wert besitzt, so daß auch alle eventuell über die Meßleitung zur Meßapparatur gelangenden Störamplituden abgeschnitten werden und die durch Demodulation erhaltenen Amplitudenänderungen nur von den jeweils am Geber unter dem Einfluß der physikalischen Meßgröße entstehenden Frequenzänderungen abhängig sind. Mit Vorteil können auch Bregrenzung und Demodulation in einer einzigen Stufe erfolgen, so daß für die Begrenzung nicht einmal eine besondere Stufe erforderlich ist.The arrangement according to the invention, however, eliminates any falsification of the measurement result due to unwanted amplitude changes by switching between the frequency modulated by the encoder Oscillator and the demodulator a limiter stage is switched on, behind the the measuring voltage amplitude has a lower, constant value, so that also cut off any interference amplitudes that might reach the measuring apparatus via the measuring line and the amplitude changes obtained by demodulation only depend on the respective Frequency changes occurring at the encoder under the influence of the physical measured variable are dependent. Limitation and demodulation can also be advantageous be done in a single stage, so that there is not even a special one for the limitation Level is required.
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEC4355A DE892683C (en) | 1951-06-21 | 1951-06-21 | Method for the electrical measurement of physical quantities |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEC4355A DE892683C (en) | 1951-06-21 | 1951-06-21 | Method for the electrical measurement of physical quantities |
Publications (1)
Publication Number | Publication Date |
---|---|
DE892683C true DE892683C (en) | 1953-10-08 |
Family
ID=7013351
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEC4355A Expired DE892683C (en) | 1951-06-21 | 1951-06-21 | Method for the electrical measurement of physical quantities |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE892683C (en) |
-
1951
- 1951-06-21 DE DEC4355A patent/DE892683C/en not_active Expired
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