DE1052700B - Photoelectric measuring and control device for liquid level indicators - Google Patents

Photoelectric measuring and control device for liquid level indicators

Info

Publication number
DE1052700B
DE1052700B DEF25586A DEF0025586A DE1052700B DE 1052700 B DE1052700 B DE 1052700B DE F25586 A DEF25586 A DE F25586A DE F0025586 A DEF0025586 A DE F0025586A DE 1052700 B DE1052700 B DE 1052700B
Authority
DE
Germany
Prior art keywords
liquid level
photocell
control device
level indicators
photoelectric 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.)
Pending
Application number
DEF25586A
Other languages
German (de)
Inventor
Dipl-Ing Arnold Forster
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ARNOLD FORSTER DIPL ING
Original Assignee
ARNOLD FORSTER DIPL ING
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 ARNOLD FORSTER DIPL ING filed Critical ARNOLD FORSTER DIPL ING
Priority to DEF25586A priority Critical patent/DE1052700B/en
Publication of DE1052700B publication Critical patent/DE1052700B/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
    • G01F23/284—Electromagnetic waves
    • G01F23/292—Light, e.g. infrared or ultraviolet

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Description

Fotoelektrische Meß- und Regelvorrichtung für Flüssigkeitsstandanzeiger Zu mannigfachen Meß- und Regelzwecken wird die Änderung der Höhe einer Flüssigkeit in einem Standrohr benutzt. Dazu ist erforderlich, den Augenblick der Überschreitung oder Unterschreitung einer bestimmten Niveauhöhe auszunutzen. Dies wird bei den bekannten fotoelektrischen Ausführungen dadurch erreicht, daß beispielsweise ein undurchsichtiger Schwimmer auf der Flüssigkeit in einem durchsichtigen Standrohr eine Unterbrechung des Lichtstromes auf die Fotozelle bewirkt, oder aber die Flüssigkeit ist stark gefärbt, so daß die Minderung der Helligkeit eines durch das Glasrohr gehenden Lichtstrahls infolge der Trübung den Strom an der Fotozelle beeinflußt. In beiden Fällen ist aber die eintretende Wirkung oft zu gering, und dadurch treten Mängel auf, die die Verwendung weitgehend einschränken.Photoelectric measuring and regulating device for liquid level indicators The change in the height of a liquid is used for a variety of measuring and regulating purposes used in a standpipe. This requires the moment of exceeding or below a certain level. This is the case with the known photoelectric designs achieved in that, for example, a opaque float on top of the liquid in a clear standpipe an interruption of the luminous flux on the photocell, or the liquid is strongly colored, so that the diminution of the brightness of one through the glass tube due to the clouding of the light beam, the current on the photocell is affected. In both cases, however, the effect that occurs is often too little, and it occurs Defects that largely limit its use.

Es sind auch Vorrichtungen bekannt, bei denen das durchsichtige Standrohr zwischen Lichtquelle und Fotozelle und eine Blende zwischen Standrohr und Fotozelle angeordnet sind. Das heißt, daß die Flüssigkeitshöhe ohne Benutzung eines Hilfsmittels nur durch den sich ändernden Zylinderlinseneffekt fotoelektrisch ausgewertet wird. Diese Vorrichtungen nutzen ohne besondere geometrische Anordnung lediglich die Differenzlichtmenge aus. Devices are also known in which the transparent standpipe between the light source and the photocell and a screen between the standpipe and the photocell are arranged. That is, the liquid level without the use of an aid is only evaluated photoelectrically by the changing cylinder lens effect. Without a special geometric arrangement, these devices only use the differential amount of light the end.

Eine wesentlich bessere Ausnutzung erhält man gemäß der Erfindung dadurch, daß durch eine weitere Blende die durch den Mittelpunkt des Rohres gehenden Hauptstrahlen von der Fotozelle abgeschirmt werden. Hierdurch wird erreicht, daß bei leerem Glasrohr die Lichtmenge nahezu Null wird. A significantly better utilization is obtained according to the invention in that the passing through the center of the tube through another diaphragm Main rays are shielded by the photocell. This achieves that when the glass tube is empty, the amount of light is almost zero.

In den Zeichnungen ist ein Ausführungsbeispiel gemäß der Erfindung schematisch dargestellt, und zwar zeigt Fig. 1 die Brechungsverhältnisse bei luftgefülltem und Fig. 2 bei wassergefülltem Standrohr C, wobei der Brechungsindex von Glas und Wasser als gleich angenommen wird. In the drawings is an embodiment according to the invention shown schematically, namely Fig. 1 shows the refraction conditions with air-filled and FIG. 2 with the standpipe C filled with water, the refractive index of glass and Water is assumed to be equal.

Die von der Lichtquelle L ausgehenden Strahlen werden derart durch das Glasrohr G abgelenkt, daß sie bei Luftfüllung die hinter der Blende B angeordnete Fotozellen nicht treffen können. Die durch den Mittelpunkt des Glasrohres hindurchgehenden Hauptstrahlen treffen auf die erfindungsgemäß angeordnete besondere Blende und gelangen dadurch nicht zur Fotozelle. Bei Wasserfüllung gelangt ein Teil der Strahlen wegen des jetzt auftretenden Zylindereffekts um die zusätzliche Blende B1 herum auf die FotozelleF und kann für den Steuervorgang ausgenutzt werden. The rays emanating from the light source L are transmitted in this way the glass tube G deflected so that it is arranged behind the diaphragm B when filled with air Photocells cannot hit. The ones passing through the center of the glass tube Principal rays strike the special diaphragm arranged according to the invention and arrive thus not to the photocell. When filled with water, some of the rays get through of the now occurring cylinder effect around the additional aperture B1 around on the Photocell F and can be used for the control process.

Claims (1)

PATENTANSPRUCH: Fotoelektrische Meß- und Regelvorrichtung für Flüssigkeitsstandanzeiger, bei der das Standrohr zwischen Lichtquelle und Fotozelle und eine Blende zwischen Standrohr und Fotozelle angeordnet sind, dadurch gekennzeichnet, daß durch eine weitere Blende die durch den Mittelpunkt des Rohres gehenden Hauptstrahlen von der Fotozelle abgeschirmt werden. PATENT CLAIM: Photoelectric measuring and control device for liquid level indicators, with the standpipe between the light source and the photocell and a screen between Standpipe and photocell are arranged, characterized in that by a further aperture the main rays passing through the center of the tube from the Be shielded from the photocell. In Betracht gezogene Druckschriften: Siemens-Zeitschrift, Bd. 19, Mai 1939, S. 234 bis 236; französische Patentschrift Nr. 940109. Publications considered: Siemens-Zeitschrift, Vol. 19, May 1939, pp. 234-236; French patent specification No. 940109.
DEF25586A 1955-12-14 1955-12-14 Photoelectric measuring and control device for liquid level indicators Pending DE1052700B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEF25586A DE1052700B (en) 1955-12-14 1955-12-14 Photoelectric measuring and control device for liquid level indicators

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEF25586A DE1052700B (en) 1955-12-14 1955-12-14 Photoelectric measuring and control device for liquid level indicators

Publications (1)

Publication Number Publication Date
DE1052700B true DE1052700B (en) 1959-03-12

Family

ID=7091693

Family Applications (1)

Application Number Title Priority Date Filing Date
DEF25586A Pending DE1052700B (en) 1955-12-14 1955-12-14 Photoelectric measuring and control device for liquid level indicators

Country Status (1)

Country Link
DE (1) DE1052700B (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1202514B (en) * 1958-06-26 1965-10-07 Baird & Tatlock Ltd Photoelectric display or warning device
DE1253472B (en) * 1964-02-08 1967-11-02 Kueckens Alexander Process for the photoelectric measurement of transparent and non-transparent media
DE2437798A1 (en) * 1974-08-06 1976-02-19 Paolo Mueller Photoelectronic testing of filled bottles - in bottle filling plants, involves comparing ray deflection by full and incompletely filled bottle
DE2855651A1 (en) * 1978-12-22 1980-06-26 Bayer Ag Photoelectric liq. level detector for capillary tube - detects passage of liq. surface through light barrier and is coupled to reference store
DE3417023A1 (en) * 1984-05-09 1985-11-21 Wolfgang Dr. 7000 Stuttgart Ruhrmann Sensor for measuring the level of a liquid

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR940109A (en) * 1947-01-15 1948-12-03 Improvements to pneumatic devices for comparison or measurement of linear dimensions and application to the control of machine tools

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR940109A (en) * 1947-01-15 1948-12-03 Improvements to pneumatic devices for comparison or measurement of linear dimensions and application to the control of machine tools

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1202514B (en) * 1958-06-26 1965-10-07 Baird & Tatlock Ltd Photoelectric display or warning device
DE1253472B (en) * 1964-02-08 1967-11-02 Kueckens Alexander Process for the photoelectric measurement of transparent and non-transparent media
DE2437798A1 (en) * 1974-08-06 1976-02-19 Paolo Mueller Photoelectronic testing of filled bottles - in bottle filling plants, involves comparing ray deflection by full and incompletely filled bottle
DE2855651A1 (en) * 1978-12-22 1980-06-26 Bayer Ag Photoelectric liq. level detector for capillary tube - detects passage of liq. surface through light barrier and is coupled to reference store
DE3417023A1 (en) * 1984-05-09 1985-11-21 Wolfgang Dr. 7000 Stuttgart Ruhrmann Sensor for measuring the level of a liquid

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