SE7910055L - ELECTROOPTICAL INSTRUMENTS - Google Patents
ELECTROOPTICAL INSTRUMENTSInfo
- Publication number
- SE7910055L SE7910055L SE7910055A SE7910055A SE7910055L SE 7910055 L SE7910055 L SE 7910055L SE 7910055 A SE7910055 A SE 7910055A SE 7910055 A SE7910055 A SE 7910055A SE 7910055 L SE7910055 L SE 7910055L
- Authority
- SE
- Sweden
- Prior art keywords
- optical
- led
- leg
- barometer
- oscillator
- Prior art date
Links
- 230000003287 optical effect Effects 0.000 abstract 6
- 239000012530 fluid Substances 0.000 abstract 2
- 230000005855 radiation Effects 0.000 abstract 2
- 239000000835 fiber Substances 0.000 abstract 1
- 239000007788 liquid Substances 0.000 abstract 1
- 230000010363 phase shift Effects 0.000 abstract 1
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
- G01F1/37—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 the pressure or differential pressure being measured by means of communicating tubes or reservoirs with movable fluid levels, e.g. by U-tubes
- G01F1/372—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 the pressure or differential pressure being measured by means of communicating tubes or reservoirs with movable fluid levels, e.g. by U-tubes with electrical or electro-mechanical indication
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
-
- 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
- G01F1/40—Details of construction of the flow constriction devices
- G01F1/46—Pitot tubes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K5/00—Measuring temperature based on the expansion or contraction of a material
- G01K5/02—Measuring temperature based on the expansion or contraction of a material the material being a liquid
- G01K5/18—Measuring temperature based on the expansion or contraction of a material the material being a liquid with electric conversion means for final indication
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/0033—Transmitting or indicating the displacement of bellows by electric, electromechanical, magnetic, or electromagnetic means
- G01L9/0039—Transmitting or indicating the displacement of bellows by electric, electromechanical, magnetic, or electromagnetic means using photoelectric means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/0041—Transmitting or indicating the displacement of flexible diaphragms
- G01L9/0076—Transmitting or indicating the displacement of flexible diaphragms using photoelectric means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/0041—Transmitting or indicating the displacement of flexible diaphragms
- G01L9/0076—Transmitting or indicating the displacement of flexible diaphragms using photoelectric means
- G01L9/0077—Transmitting or indicating the displacement of flexible diaphragms using photoelectric means for measuring reflected light
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/0091—Transmitting or indicating the displacement of liquid mediums by electrical, electromechanical, magnetic or electromagnetic means
- G01L9/0097—Transmitting or indicating the displacement of liquid mediums by electrical, electromechanical, magnetic or electromagnetic means using photoelectric means
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Electromagnetism (AREA)
- Measuring Fluid Pressure (AREA)
- Optical Transform (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Optical Radar Systems And Details Thereof (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Level Indicators Using A Float (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
An rf oscillator comprising an electric circuit and an optical leg is used to measure physical variables capable of changing the length of the optical leg. In the circuitry, a beam of amplitude modulated radiation returning from the optical leg is converted to an electric signal, amplified, and used to modulate the drive of an LED which emits a beam of optical radiation. The beam is delivered to and returned from a reflective surface at the end of the optical path by waveguide means, phase shifts in the beam due to actual or effective changes in the pathlength of the optical leg are converted to corresponding shifts in the frequency of the oscillator. Details are given of using this in a fluid barometer, differential pressure sensor, fluid velocimeter, Pitot tube, shift position locator and in temperature sensors. Fig. 2 shows the barometer, where the modulated beam from LED 16 is passed to the reflective surface 60 of liquid 54 by fibre optic waveguide 44, the returning beam being separated by beam-splitter 26 and passed to detector 22 which modulates the LED via amplifier 20; the resonant frequency varies with the length of path 58 and hence with atmospheric pressure. <IMAGE>
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US96894878A | 1978-12-13 | 1978-12-13 |
Publications (1)
Publication Number | Publication Date |
---|---|
SE7910055L true SE7910055L (en) | 1980-06-14 |
Family
ID=25514975
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SE7910055A SE7910055L (en) | 1978-12-13 | 1979-12-06 | ELECTROOPTICAL INSTRUMENTS |
Country Status (8)
Country | Link |
---|---|
JP (1) | JPS5582917A (en) |
CA (1) | CA1130108A (en) |
DE (1) | DE2950209A1 (en) |
FR (1) | FR2444258A1 (en) |
GB (1) | GB2040131A (en) |
IL (1) | IL58895A0 (en) |
IT (1) | IT1127732B (en) |
SE (1) | SE7910055L (en) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57142331U (en) * | 1981-02-27 | 1982-09-07 | ||
EP0074055A3 (en) * | 1981-09-03 | 1984-09-12 | Honeywell Inc. | Fiber optic pressure sensor |
DE3236360A1 (en) * | 1982-04-16 | 1983-10-20 | Brown, Boveri & Cie Ag, 6800 Mannheim | Method and device for monitoring rooms for the presence or absence or the movement of objects |
DE3307966A1 (en) * | 1983-03-07 | 1984-09-13 | Philips Patentverwaltung Gmbh, 2000 Hamburg | Temperature sensor |
DE3621009A1 (en) * | 1986-06-23 | 1988-01-07 | Truetzschler & Co | DEVICE FOR DETECTING THE LEVEL IN A FIBER MATERIAL STORAGE, ESPECIALLY FOR SPINNING PREPARATION MACHINES |
GB8928714D0 (en) * | 1989-12-20 | 1990-11-21 | Hunting Eng Ltd | Electro-optical devices |
DE4213602A1 (en) * | 1992-04-24 | 1993-10-28 | Alexander W Dr Ing Koch | Temp. measurement using temp. dependent length change of expanding body - dividing beam into sensing and reference beams, directing sensing beam to expanding body and measuring phase difference between beams. |
US7642096B2 (en) | 2004-12-20 | 2010-01-05 | Massachusetts Institute Of Technology | Liquid expansion thermometer and microcalorimeter |
DE102011079983A1 (en) * | 2011-07-28 | 2013-01-31 | Robert Bosch Gmbh | measuring device |
FR3044413B1 (en) * | 2015-12-01 | 2017-12-08 | Safran | FIBER OPTIC MEASURING PROBE |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1449293A (en) * | 1965-10-05 | 1966-08-12 | Bolkow Gmbh | Device for measuring, using laser beams, the true altitude of a flying body in relation to the earth's surface |
DE1807237A1 (en) * | 1968-06-26 | 1970-04-23 | Jenoptik Jena Gmbh | Electromagnetic distance measuring device |
GB1273676A (en) * | 1969-09-19 | 1972-05-10 | Zeiss Jena Veb Carl | Electro-magnetic distance measuring apparatus |
FR2321116A1 (en) * | 1975-08-13 | 1977-03-11 | Anvar | TEMPERATURE MEASUREMENT PROCESS AND PROBE FOR ITS IMPLEMENTATION |
-
1979
- 1979-12-03 GB GB7941654A patent/GB2040131A/en not_active Withdrawn
- 1979-12-05 CA CA341,252A patent/CA1130108A/en not_active Expired
- 1979-12-06 SE SE7910055A patent/SE7910055L/en not_active Application Discontinuation
- 1979-12-07 IL IL58895A patent/IL58895A0/en unknown
- 1979-12-12 FR FR7930502A patent/FR2444258A1/en not_active Withdrawn
- 1979-12-13 DE DE19792950209 patent/DE2950209A1/en not_active Withdrawn
- 1979-12-13 JP JP16265479A patent/JPS5582917A/en active Pending
- 1979-12-17 IT IT28075/79A patent/IT1127732B/en active
Also Published As
Publication number | Publication date |
---|---|
IL58895A0 (en) | 1980-03-31 |
FR2444258A1 (en) | 1980-07-11 |
GB2040131A (en) | 1980-08-20 |
DE2950209A1 (en) | 1980-06-26 |
IT1127732B (en) | 1986-05-21 |
CA1130108A (en) | 1982-08-24 |
JPS5582917A (en) | 1980-06-23 |
IT7928075A0 (en) | 1979-12-17 |
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