AT325870B - DEVICE FOR CONTACT-FREE MEASUREMENT OF THE HUMIDITY CONTENT OF MOVING WEBS MADE OF DIELECTRIC MATERIAL, IN PARTICULAR OF PAPER WEBS - Google Patents

DEVICE FOR CONTACT-FREE MEASUREMENT OF THE HUMIDITY CONTENT OF MOVING WEBS MADE OF DIELECTRIC MATERIAL, IN PARTICULAR OF PAPER WEBS

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Publication number
AT325870B
AT325870B AT533670A AT533670A AT325870B AT 325870 B AT325870 B AT 325870B AT 533670 A AT533670 A AT 533670A AT 533670 A AT533670 A AT 533670A AT 325870 B AT325870 B AT 325870B
Authority
AT
Austria
Prior art keywords
contact
dielectric material
webs
humidity content
free measurement
Prior art date
Application number
AT533670A
Other languages
German (de)
Other versions
ATA533670A (en
Inventor
Ljudmila Alexeevna Banina
Viktor Nikolaevich Fursov
Original Assignee
P T I Nii
Balakhninsky Tselljulozno Buma
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by P T I Nii, Balakhninsky Tselljulozno Buma filed Critical P T I Nii
Priority to AT533670A priority Critical patent/AT325870B/en
Publication of ATA533670A publication Critical patent/ATA533670A/en
Application granted granted Critical
Publication of AT325870B publication Critical patent/AT325870B/en

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
    • G01N27/223—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance for determining moisture content, e.g. humidity

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Description

  

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 EMI1.1 
 

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 geerdet ist, wird vorteilhaft auf die Frequenz der energiereichsten Schwingungen, die in dem Schwingungsspektrum des bei dem Übergang der Ladungen zwischen Bahn und Walze entstehenden elektromagnetischen Feldes auftreten, und der   Schwingkreis--12, 13--des Verstärkers--4-auf   dieselbe Frequenz abgestimmt. Der   Verstärker--4--wirkt   dann als Resonanzverstärker für die mit dem Resonanzkreis   --3--   ausgesonderten Schwingungen, womit eine grosse Empfindlichkeit der Vorrichtung erzielbar ist.

   Eine Spannungsquelle--8--ist über den Resonanzkreis--12, 13--an die Anode der   Röhre--11--gelegt   und 
 EMI2.1 
 dem   Potentiometer --15-- und   Erde liegt ein weiterer   Kondensator-17-.   Die   Widerstände-14, 15-   bzw. Kondensatoren--16, 17--bilden einen zwei   RC-Glieder   enthaltenden Integratorkreis--6--, dessen an dem Potentiometerkontakt abgegriffene Ausgangsspannung dem Gitter der Voltmeterröhre zugeführt ist.

   Der Integratorkreis--6--, der nur ein RC-Glied zu enthalten brauchte, aber auch mehr als zwei RC-Glieder aufweisen könnte, bewirkt eine zeitliche Mittelwertbildung der gleichgerichteten Ausgangssignale des   Resonanzverstärkers--4--und   liefert ein etwa der Amplitudenmodulation dieses Ausgangssignales entsprechendes Mittelwertsignal, das an das Gitter der   Röhre--18--gelangt.   Im Gleichtakt mit diesem langsamer schwankenden, niederfrequenten Signal ändert sich der durch das   Messinstrument--20--fliessende   Strom, das deshalb mit einer gewissen Trägheit behaftet sein kann. Die auf einen Mittelwert basierte Information über den Feuchtigkeitsgehalt wird im übrigen den Forderungen der Praxis in vielen Fällen besser gerecht als eine die Feuchtigkeitsverteilung in Bahnlängsrichtung genau wiedergebene Information. 



     Erfindungsgemässe   Vorrichtungen haben sich in der Praxis als zuverlässig und zur Messung des Feuchtigkeitsgehaltes mit einer allen Ansprüchen genügenden Genauigkeit brauchbar erwiesen und sind zufolge ihres einfachen Aufbaues aus handelsüblichen Schaltungsbestandteilen auch nicht teuer. 



   PATENTANSPRÜCHE : 
1. Vorrichtung zum kontaktfreien Messen des Feuchtigkeitsgehaltes von bewegten Bahnen aus dielektrischem Material, insbesondere von Papierbahnen, mit einem im Abstand von der Bahn isoliert gehalterten Fühler, der an einen ein Anzeigegerät enthaltenden Messkreis angeschlossen ist, d a d u r c h g e k e n n-   zeichnet,   dass der Fühler als in der Nähe einer die Bahn   (1)   abstützenden, geerdeten Umlenkwalze od. dgl. angeordnete, in einem das Auftreten von Sprühentladungen ausschliessenden Abstand von der Bahn befindliche oder oberflächenisolierte Antenne (2) ausgebildet, diese an einen Schwingkreis (4) gekoppelt und an den Schwingkreis der Messkreis (7) angeschlossen ist. 
 EMI2.2 




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 is grounded, it is advantageous to use the frequency of the most energetic vibrations that occur in the vibration spectrum of the electromagnetic field generated when the charges transfer between web and roller, and the oscillating circuit - 12, 13 - of the amplifier - 4 - to the same frequency Voted. The amplifier - 4 - then acts as a resonance amplifier for the vibrations separated out with the resonance circuit --3 -, with which a great sensitivity of the device can be achieved.

   A voltage source - 8 - is applied via the resonance circuit - 12, 13 - to the anode of the tube - 11 - and
 EMI2.1
 The potentiometer -15- and earth is another capacitor -17-. The resistors -14, 15- or capacitors -16, 17-form an integrator circuit -6- containing two RC elements, the output voltage of which is tapped at the potentiometer contact and is fed to the grid of the voltmeter tube.

   The integrator circuit - 6 - which only needed to contain one RC element, but could also have more than two RC elements, creates a temporal averaging of the rectified output signals of the resonance amplifier - 4 - and provides approximately the amplitude modulation of this Output signal corresponding to the mean value signal, which reaches the grid of the tube - 18 -. In synchronism with this slower fluctuating, low-frequency signal, the current flowing through the measuring instrument changes, which can therefore be subject to a certain inertia. The information about the moisture content based on an average value moreover meets the requirements of practice in many cases better than information which precisely reproduces the moisture distribution in the longitudinal direction of the web.



     Devices according to the invention have proven in practice to be reliable and useful for measuring the moisture content with an accuracy that satisfies all requirements and, due to their simple construction from commercially available circuit components, are also not expensive.



   PATENT CLAIMS:
1. Device for non-contact measurement of the moisture content of moving webs made of dielectric material, in particular paper webs, with a sensor which is held insulated at a distance from the web and is connected to a measuring circuit containing a display device, characterized in that the sensor as in the vicinity of a grounded deflecting roller or the like that supports the web (1) and is located at a distance from the web or surface-insulated antenna (2) that prevents the occurrence of spray discharges; the measuring circuit (7) is connected.
 EMI2.2

Claims (1)

Resonanzkreis (3) mit vorbestimmter Resonanzfrequenz geerdet und mit dem Eingang des als auf die gleiche Frequenz abgestimmter Resonanzverstärker ausgebildeten Schwingkreises (4) verbunden ist. EMI2.3 (4) ein Gleichrichter (5) angekoppelt, an diesen ein mindestens ein RC-Glied enthaltender Integratorkreis (6) und an dessen Ausgang der als Röhrenvoltmeter ausgebildete Messkreis (7) angeschlossen ist. The resonance circuit (3) is grounded with a predetermined resonance frequency and is connected to the input of the resonance circuit (4) designed as a resonance amplifier tuned to the same frequency. EMI2.3 (4) a rectifier (5) is coupled, to which an integrator circuit (6) containing at least one RC element and to whose output the measuring circuit (7) designed as a tube voltmeter is connected.
AT533670A 1970-06-12 1970-06-12 DEVICE FOR CONTACT-FREE MEASUREMENT OF THE HUMIDITY CONTENT OF MOVING WEBS MADE OF DIELECTRIC MATERIAL, IN PARTICULAR OF PAPER WEBS AT325870B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT533670A AT325870B (en) 1970-06-12 1970-06-12 DEVICE FOR CONTACT-FREE MEASUREMENT OF THE HUMIDITY CONTENT OF MOVING WEBS MADE OF DIELECTRIC MATERIAL, IN PARTICULAR OF PAPER WEBS

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT533670A AT325870B (en) 1970-06-12 1970-06-12 DEVICE FOR CONTACT-FREE MEASUREMENT OF THE HUMIDITY CONTENT OF MOVING WEBS MADE OF DIELECTRIC MATERIAL, IN PARTICULAR OF PAPER WEBS

Publications (2)

Publication Number Publication Date
ATA533670A ATA533670A (en) 1975-01-15
AT325870B true AT325870B (en) 1975-11-10

Family

ID=3574665

Family Applications (1)

Application Number Title Priority Date Filing Date
AT533670A AT325870B (en) 1970-06-12 1970-06-12 DEVICE FOR CONTACT-FREE MEASUREMENT OF THE HUMIDITY CONTENT OF MOVING WEBS MADE OF DIELECTRIC MATERIAL, IN PARTICULAR OF PAPER WEBS

Country Status (1)

Country Link
AT (1) AT325870B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0344554A2 (en) * 1988-05-28 1989-12-06 BASF Aktiengesellschaft Measurement equipment for the determination of liquid-absorption by paper

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0344554A2 (en) * 1988-05-28 1989-12-06 BASF Aktiengesellschaft Measurement equipment for the determination of liquid-absorption by paper
EP0344554A3 (en) * 1988-05-28 1990-12-19 BASF Aktiengesellschaft Measurement equipment for the determination of liquid-absorption by paper

Also Published As

Publication number Publication date
ATA533670A (en) 1975-01-15

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