JPS56168120A - Liquid level detector - Google Patents

Liquid level detector

Info

Publication number
JPS56168120A
JPS56168120A JP7241380A JP7241380A JPS56168120A JP S56168120 A JPS56168120 A JP S56168120A JP 7241380 A JP7241380 A JP 7241380A JP 7241380 A JP7241380 A JP 7241380A JP S56168120 A JPS56168120 A JP S56168120A
Authority
JP
Japan
Prior art keywords
interface
light
liquid
point
plate
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
JP7241380A
Other languages
Japanese (ja)
Inventor
Yasukuni Yamane
Nobutoshi Gako
Chuji Suzuki
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.)
Sharp Corp
Original Assignee
Sharp Corp
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 Sharp Corp filed Critical Sharp Corp
Priority to JP7241380A priority Critical patent/JPS56168120A/en
Publication of JPS56168120A publication Critical patent/JPS56168120A/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
    • G01F23/2921—Light, e.g. infrared or ultraviolet for discrete levels
    • G01F23/2922—Light, e.g. infrared or ultraviolet for discrete levels with light-conducting sensing elements, e.g. prisms

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Level Indicators Using A Float (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)

Abstract

PURPOSE:To detect liquid level irrespectively of whether liquid is transparent or not and to make size small and also to prolong life by the constitution wherein an optically transparent plate having the 1st interface and the 2nd interface, as well as a light emitting element and a photodetector are combined. CONSTITUTION:A shield plate 6 is provided in order to prevent the refracted light in a transparent plate 1 of the time when liquid contact the 1st interface A and 2nd interface B of the plate 1 from advancing to the region D in the 2nd interface B. Now, if the liquid does not contact with the interfaces A, B, the light from a light emitting diode 3 refracts at the point P and the point Q and arrives at a phototransistor 4. On the other hand, if the liquid contacts with the interfaces A, B, the light from the diode 3 refracts in the direction of the point Q' at the point P, is shut off by the plate 6 and does not arrive at the phototransistor 4. Hence, depending upon whether the phototransistor 4 detects the light or not, the liquid level is easily detected.
JP7241380A 1980-05-28 1980-05-28 Liquid level detector Pending JPS56168120A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7241380A JPS56168120A (en) 1980-05-28 1980-05-28 Liquid level detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7241380A JPS56168120A (en) 1980-05-28 1980-05-28 Liquid level detector

Publications (1)

Publication Number Publication Date
JPS56168120A true JPS56168120A (en) 1981-12-24

Family

ID=13488564

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7241380A Pending JPS56168120A (en) 1980-05-28 1980-05-28 Liquid level detector

Country Status (1)

Country Link
JP (1) JPS56168120A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3844171A (en) * 1971-12-29 1974-10-29 E Rodger Light guide liquid level indicator
JPS5465064A (en) * 1977-11-02 1979-05-25 Toshiba Corp Optical liquid level detector

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3844171A (en) * 1971-12-29 1974-10-29 E Rodger Light guide liquid level indicator
JPS5465064A (en) * 1977-11-02 1979-05-25 Toshiba Corp Optical liquid level detector

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