WO1991002221A1 - Faseroptische sensorvorrichtung - Google Patents
Faseroptische sensorvorrichtung Download PDFInfo
- Publication number
- WO1991002221A1 WO1991002221A1 PCT/EP1990/001287 EP9001287W WO9102221A1 WO 1991002221 A1 WO1991002221 A1 WO 1991002221A1 EP 9001287 W EP9001287 W EP 9001287W WO 9102221 A1 WO9102221 A1 WO 9102221A1
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- WO
- WIPO (PCT)
- Prior art keywords
- sensor device
- ring body
- ring
- fiber optic
- measuring
- Prior art date
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
- G01B11/18—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge using photoelastic elements
-
- 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
- G01D5/32—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 with attenuation or whole or partial obturation of beams of light
- G01D5/34—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 with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/353—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 with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
- G01D5/3537—Optical fibre sensor using a particular arrangement of the optical fibre itself
- G01D5/35374—Particular layout of the fiber
Definitions
- the invention relates to a fiber optic sensor device according to the preamble of claim 1.
- Optical fibers abbreviated LWL, also known in the literature as flexible optical fibers, belong to the sub-area of fiber optics and consist of one
- Bundle of flexible optical fibers which are usually gripped at the ends and glued together.
- the end face can be ground and optically polished. It is known to accommodate the fiber bundle in a flexible metal or plastic hose to protect against mechanical damage.
- the LWL transmit a bundle of light rays through multiple total reflection in the glass fibers, which is achieved by selecting appropriate refractive indices (refractive index).
- an optical fiber sensor which has a tensile protective sheath and around which a metal wire or a glass thread is wound in the form of at least one coil, and this package is embedded overall in a synthetic resin matrix.
- the helix or spiral therefore surrounds in a serpentine shape, in turns, each with 360 °, along the length of the optical fibers.
- This winding scheme is also when two filaments encompass the fiber.
- the helix presses on the surface of the optical fiber and produces small, compressed surfaces
- Areas that cause an increase in attenuation in the optical fiber and are therefore measurable e.g. B. with an optical attenuation meter or the like.
- the known multiple coils can also be wound in a cross lay on the coated optical fiber with a suitable lay length.
- the length of the coated optical fiber is still wrapped around the outside in serpentine form and in beats or turns of 360 °.
- the invention seeks to remedy this.
- the invention as characterized in the claims, solves the problem of increasing the measuring accuracy of a sensor device and expanding its fields of application.
- the invention starts with the knowledge that a only helical encirclement of the fiber optic cable is insufficient, since only a poor line-like contact with the fiber optic cable is created and by using also
- the threads or here the optical fibers are present in the majority and continue to form the flat structure, i.e. the braid, with each other or with themselves, become a kind formed by many nodes from fiber to fiber itself.
- the fiber optic cable is not only subjected to massive external loads, as in the known design, but actively loads one another. Depending on the individual case, they can do without an outer pull wire made of metal or glass fiber, the transmission can take place directly from the protective jacket via a suitable embedding layer.
- a characteristic of the network is that the individual fiber optic cables do not somehow run diagonally to each other, but overlap and overlap. A number of node points are thus accommodated in a predetermined crowded space. Due to the large number of node points and also the effect of individual fiber optics directly below one another, a relatively greatly enlarged and accordingly more precisely measurable change in attenuation in the fiber optic cable is achieved, i.e. the associated relative change in the luminous flux at the measuring points, the fiber optic ends, is much more precise.
- the braid is laid out in a desired preferred direction depending on the respective measurement object.
- the preferred direction of the braid is the longitudinal direction of the fiber optic strands or bundles, such as. B. occurs in the measurement of longitudinal strains or changes in distance.
- the individual optical fibers can be formed in pairs, ie each consist of two optical fiber strands.
- the invention can also be designed in such a way that a loop area of the braid is picked out and formed into one or more self-contained ring bodies by bringing the fiber optic ends together. This simplifies the design, with relatively increased attenuation at the FO.
- the fiber optic as a ring body in particular as a circular ring, is used as a more freely deformable fiber optic unit, in which, in contrast to the previously supported material pressure in the fiber optic strand, the fiber optic molded body deforms as such, i.e. it bulges under pressure when the ring body is pressed the ring body is flattened: in the latter case z. B. from a circular ring to a ring ellipse.
- the ring body consisting of individual or a group of LWL thus transmits its deformation via lead leads out of the ring, z. B.
- the measurement display allows the size of the permitted degree of deformation and its sensitivity to be determined from the above parameters.
- Encoders or switches constructed on this basis can advantageously be dimensioned, e.g. B. with the volume 12 ⁇ 10 ⁇ 6 mm 3 . Switching distances from approx. 1 mm to approx. 25 mm can be used.
- the sensitivity can largely be set freely.
- FIG. 1 is a perspective view of a room with paintings hung on the walls by means of fiber optic aggregates with the associated monitoring device;
- FIG. 4 shows a perspective view of a bar as a measurement object with the associated arrangement of an optical fiber;
- Fig. 5 in section, a hose as a test object with embedded fiber optic;
- FIG. 7 shows a highly schematic side view of the arrangement of the optical fiber, a measuring and monitoring device between two walls as a measurement object
- FIG. 8 shows a ship with a tow rope and a schematic of an optical fiber
- FIG. 9 is a side view of a measuring arrangement for optical fibers in the water.
- Fig. 10 shows a section of a plate as a measurement object with an attached or embedded arrangement of an optical fiber and the auxiliary device, for. B. light sources;
- Fig. 12 is a schematic plan view of the main part of the measuring and monitoring device in the form of one of, for example, three
- Optical fiber (LWL) formed braid 13 shows the ring body in a side view with an attached picture frame;
- Fig. 14 housed in a housing
- FIG. 15 shows an installation variant modified for FIG. 14 for the ring body and its actuating element
- Fig. 16 is a section along line A-B of Fig. 15; 17 and 18 are a top view and associated side view of four ring bodies mounted in a housing with a joy stick as the actuating element;
- 19 and 20 are a plan view and a side view, for. T. on average, a variant with four
- Ring bodies that can be loaded under pressure using an adjusting lever
- 21 is a side view in section
- FIG. 22 shows a simplified top view of FIG. 21, in which the actuating lever loads the ring body in tension
- Fig. 23 is a schematic side view of a
- Fig. 24 in section a side view of a
- FIG. 25 shows an embodiment of a musical instrument key modified to FIG. 24, broken off;
- Fig. 34 is a fiber optic distance measuring device, highly schematic.
- the individual FO, z. B. three are shown enlarged in Fig. 12.
- Each optical fiber 1, 2, 3 consists of one or each of a plurality of light-conducting fibers, the end regions of which are optically closed, but which join together to form a braid. 1 has a preferred direction, which is its longitudinal direction.
- LWL 1, 2, 3 so-called nodes 4 are formed in the braid, at which the LWL are
- LWL 1 and LWL 3 are optical fibers, e.g. B. LWL 1 and LWL 3 to be arranged as a braid and used for measurement.
- the fiber strands or bundles referred to in FIG. 12 as individual fiber optics 1, 2, 3 can each be constructed in pairs, that is to say each contain two individual fiber optics 3a, 3b, as indicated schematically in only one area of the drawing.
- the protective tube with the associated embedding material is not shown in FIG. 12 for reasons of clarity. However, they are not absolutely necessary.
- 1-3 are in a room 5, z. B. a museum, a plurality of
- Position x, Fig. 1 is in the sense of the embodiments, Fig. 2 or Fig. 3, either with the help of a
- an optical fiber 7 in the sense of FIG. 12 is integrated or embedded in the test zone (in the case of the wall surface 15a, which can be a side or bottom surface). over
- Measuring lines 10 and measuring devices 8, 9 is the in
- FIG. 5 An embodiment for the advantageous application as a compressive stress meter is explained with reference to FIG. 5.
- an optical fiber 7 is embedded in an elastic hose 16; a filling compound 17 is one
- Plates 20, 21 acts and according to a variant in the plurality of fiber optic 7 laterally to each other
- Plates 20, 21 is arranged.
- the LWL 7 are subject to a radial change in shape when the plates 20, 21 are pressed together, so that the between their ends 8a, 9a, cf. Fig. 12, existing luminous flux in turn attenuated accordingly and associated measurement signals can be detected by the measuring devices 8, 9.
- Another variant provides only a flexible fiber optic 7 curved at the band regions according to FIG. 12
- the fiber 7 as a braid can be used according to one embodiment, instead of pull or
- FIG. 7 shows spaced walls 23, 24 at a distance x.
- a periodic or intermittent increase in this distance is detected by at least one fiber optic cable 7, the ends 7a, 7b of which at corresponding fastening points on the walls and the connection of intermediate members of small dimensions, such as support cables, beams and / or supporting or
- Distance measurement can the tensile load directly on LWL 7 or by a coating applied to the latter, e.g. B. made of glass fiber reinforced synthetic resin as a protective and embedding material on the nodes 4.
- an optical fiber 7 can be used within predetermined limits for distance or distance measurements in which x between the walls 23, 24 decreases.
- the measuring conductors 10 are indicated schematically.
- One embodiment concerns the application of a
- Pulley 27 a tow 12a In it or on it, at least one FO 7 is protected in a protective tube or the like. housed, especially inside the
- Measurement of a liquid pressure e.g. B. the water pressure either in open water or in completely or partially closed containers.
- an FO 7 which is preferably embedded in an elastic hose 16 in a protected manner, is determined by the depth or at variable depths
- a capsule 31 or the like. serves to accommodate the hose 16 and / or the FO 7.
- a further embodiment is the use of the FO 7 with its measuring line and the measuring devices 8, 9 as a counter 36 for events or processes, also as
- the LWL 7, cf. 10 is in an associated object, e.g. B. in or on one
- LWL 7 slightly changed with a predetermined frequency or unperiodically, the associated light flow changes accordingly, is in the measuring devices 8, 9th recorded electronically, transformed into counts and evaluated in measuring stage 36. Weight bodies 33 falling onto the optical fiber 7 are detected and evaluated in a similar manner, devices 8, 9, 36 working as counters or scales, or light pulses from a light source 34 directed at an optical fiber 7
- test object e.g. B.
- a beam 40 which is supported on supports 41 and is loaded by forces F 1 and F2, illustrated in FIG.
- FIG. 7 Another variant of the invention relates to the use of the FO 7 in the form of a braid in tennis courts. There is still one here
- Marking ie on the baseline and the side stripes, embedded.
- the corresponding length is bridged or detected by a plurality of optical fibers 7 and a plurality of measuring lines 10.
- the object is achieved, the measuring devices 8, 9, the z. B. work as transmitter and receiver modules, metrologically cheaper, d. H. to be placed close together.
- LWL 7 Unit with a common housing or the like.
- Optical fibers 7; 1, 2, 3 with a test object for the same components 6, 6a; 15; 34, 35, 33; 22, 21 is non-positively connected. With the non-positive connection, a tensile or compressive force is transferred to the fiber optic cable.
- the braid 7 of the optical fibers, cf. Fig. 12, in particular, should loop around the test object, i. H. the LWL 7 forms a kind of loop, in which the middle part is led around the test object.
- the test object can e.g. B. the upper frame 6a, cf. 1, of the painting 6 to be monitored. The loop is thus formed around the latter by the LWL 7 so that one of the
- Fiber optic cable 7 can be a loop-shaped braid, at one end of which an at least two-wire signal cable 10 leads to the common unit of measuring devices 8, 9 and from here on to the counter 36.
- the ring body 110 is designed as a circular or measuring ring, can be fastened to a wall via a holder 112 and a picture frame 114 is suspended from it via a connecting member 113, with the connection via optical fiber 111 and transmitter - / Receiver unit 119a a security device against theft
- An annular body 110a is enclosed relatively freely in the housing 116 according to FIG. 14, but can have a supporting contact surface to the inner wall of the housing at a predetermined point 117 and is directly over its end by a T-piece 115 of an actuator or a pressure plate 115a in
- a ring body 110b can be solid or
- elastic housing 116a can be built in or embedded so that it is highly protected, but a preferably guided in the neck 116b
- a return spring 120 is provided in the push button, the circumferential collar of which underlies the T-piece as a holder (FIGS. 15, 16).
- Adjusting lever 121 can be pivoted via a joint, a ball or a hinge in two planes which cross one another, so that the adjusting lever 121 presses on a transmitter plate 122 in the housing and from here via the respective end wall 124 the actuating pressure is at a point on the outer circumference transmits the ring body as a measurement, control or manipulated variable.
- the control lever works in the X and Y position planes.
- the ring bodies are all deformed by pressure, so that an arc of the outer circumference bulges approximately radially inward (indicated by dashed lines in FIG. 17, 13 as state 110a). So the joystick serves as
- Toggle switch it can be operated by membrane or finger contact on two or only one level. It is used for simulation and control, e.g. B. in flight operations, on slot machines, at the control center of a power plant, on an electric locomotive. Of course he can
- Ring body 110 also as a measuring ring for measuring
- the switch is used as a toggle switch or as a lever switch
- Connection LWL 111 to an SE unit 119a or the downstream measuring apparatus can be supplied, also for control and monitoring purposes.
- Switch with a fiber optic ring body 110 also as
- Pressure and slide switches can be used to measure pressure in the air, in water, in reservoirs, etc.
- Particles are used. This applies to the pressure measurement of compressed fluids in membranes, for monitoring objects of value suspended on the measuring ring and the like. respectively.
- the ring bodies 110 as measuring rings can be switched in series or in parallel in order to adapt and increase the measuring accuracy.
- the travel of a set pin 119 or a shaft can be changed from the outside by a screw, by an eccentric, by a movable one
- Solenoid core or otherwise can be used in security technology for monitoring doors, gates and windows as an alarm or monitoring switch, especially where long switching distances are to be avoided and where or the like for security reasons. must not be switched by current or a magnetic field.
- the ring bodies or the measuring rings as fiber optic units can advantageously be used on touch-sensitive keys, on so-called keyboards (keypads of a computer) or as path-sensitive keys on musical instruments, including pianos, when it comes to determining the tone amplitude and frequency through the travel preset and vary.
- keyboards keyboards of a computer
- path-sensitive keys on musical instruments including pianos
- FIGS. 24, 25 Only one embodiment is shown in FIGS. 24, 25.
- Base body 125 shown broken off one
- a button 140 of elongated design is shown above one side, which can be pivoted at one end via a joint 141 and is cushioned at the other end by a return spring 143: new is, however, to make a recess 142 on one side of the key 140 and to store an annular body made of fiber optic material in it.
- LWL 111 lead from the joint to the usual converter or
- Transmitter-receiver The variant according to FIG. 25 provides a different recess 142a as an open incision not on the key, but on the base body 145 of the piano, but here, too, the ring body 110 is embedded between the key 140 and the base body. The joint 141 is then arranged at the opposite end. The piano player's finger pressure is transferred to the key as load D.
- the desired or predetermined one can now advantageously be provided by the manufacturer before delivery of the device
- Set pressure load D vary in individual cases and so on the part of the manufacturer or later at
- the FO also records the speed of the keystroke and the associated spectrum.
- a joystick or toggle switch according to FIGS. 19 and 20 or 21 and 22 is suitable for one of the aforementioned applications.
- Control lever 121 the head of which protrudes from the housing 116 and a sleeve shields the interior of the housing against moisture and dust, approximately in the central region of the shaft, with a transmitter plate 122, similar to that shown in FIG. 6.
- the spring element has an approximately parallel to the shaft 119 Leg or a shaft 31 provided on which the transmitter plate 122 in one of the switching positions
- Hook springs 129 are shown in simplified form only two.
- the lower head 132 of the adjusting lever can advantageously be moved on or on the housing
- articulated helical spring 133 may be inserted or connected to the latter.
- the hook spring allows a further simplification. It is a type of hairpin feather. Its upper area or the head can be guided on the inner wall of the housing 116, so that the assembly is simple. The head can be guided further on the cover plate 116c of the housing.
- Shaft 131 of the spring available.
- shape of the spring can vary.
- the variant according to FIGS. 21, 22 only allows the inner circumference of the ring body 110 to be used for the deformation, in which case the ring body 110 is deformed in each case in tension, that is to say is flattened out of the circular shape.
- the ring bodies 110 can advantageously be present at any vertical height, opposite one another (two ring bodies), or distributed over a circumference (more than two ring bodies) be, however, such, cf.
- FIG. 22 shows that an arcuate piece of the ring body rests relatively intimately on the surface of the shaft 119a at one end, while the other end of the ring body is supported on a holder 136, which can be designed as a hook or eye.
- the other ring body 110 'then lies with its shaft-side end above or below the ring body 110, but in turn encompassing the shaft. You can layer a plurality of ring bodies stacked one above the other, z. B. also ten to twenty pieces.
- adjusting lever 121 is shown here for adjustment in only one plane, when the hinge 135 is replaced by a ball joint, it can be pivoted or tilted on all sides by 360 °, with at least one only for each angular direction
- Adjustment direction responsive fiber optic ring body 110, 110 ', etc. may be present.
- Another application of the ring body 110, cf. 23 advantageously consists in the measurement of
- Float 128, which comes via a lever, preferably L-shaped angle lever 126, 126a and a joint or hinge point 125, to bear against the outer surface of the ring body serving as a measuring ring 110, which on the immovable side on one
- the arrangement is preferably suitable for transferring a measuring pressure to the
- the sensor device can advantageously also do so
- ring bodies 110, 110a, 110b supported from one another are in the form of a packet or a layer or abut against him or her
- Target e.g. B. a bridge or a painting frame is limited in two directions, e.g. B.
- LWL optical fibers
- nodes cf. Fig. 12, from.
- Another advantageous effect is that in a column or row of fiber optic rings according to FIGS. 29 to 31; 33 such an optimized arrangement is achieved by laying only one fiber optic strand or fiber, that is to say by simple winding technology, by continuously shaping the fiber optic cable 110c into a circle, the end of the strand continuing in another
- LWL 110c in turn, approximately circular, essentially closed LWL elements 110d are formed if there is sufficient space.
- the individual fiber optic units are thus in the manner of a repeat pattern in columns, z. B. vertically, or in rows, e.g. B. horizontally, in individual cases in the oblique direction, built up, and that from individual or more fiber optic units 110c, 110d in a confined space.
- the fiber optic rings or ring-shaped fiber optic ring bodies 110, 110c, 110d according to FIGS. 26-32:
- FIG. 26 The manufacture of only one ring body 110 can be seen in FIG. 26 with an approximately 360 ° circumferential guidance of the optical fiber thread or strand.
- the guidance of the latter to form three annular bodies 110c in a linear, continuous extension is shown in FIG. 27, only one of the associated tangential transition points 150 being shown, this stop corresponding to the other embodiment variants of FIGS. 28, 29, 33, 32 is shown.
- the stop 150 ensures the geometrically remaining predetermined shape of the ring-shaped or circular ring body 110, 110c, 100d. It can be produced by a mechanical, small, clamp-shaped member (not shown) which is optically inactive, that is to say does not impair the light guidance.
- a transition point 150 produced by a relatively thin adhesive layer can be more advantageous in individual cases. This also consists of optical
- the two straight parts of the optical fiber are excessively spaced apart in the drawing, the routing around on the right in the figure corresponds essentially to 360 °.
- the ring body
- 110c, 110d are approximately parallel to each other. 29, whose side view in the direction of arrow Y from
- FIG. 31 shows another ring body 110c on a base.
- a compression spring 120a can advantageously be used as counterforce to compensate for the measuring force F in the sensor device.
- Annular bodies 110 side by side between an upper plate 20 loaded by the measuring force F and two
- Support plate 21 with corresponding holding or
- Transition points 150 are shown schematically here, as well as the unspecified two vertically arranged return springs.
- a measuring coil 160 which has a coil body rotating around 360 ° in a housing, with a slot through which a straight part 111 or a straight piece of the fiber optic braid 7 is continuous as desired can be pulled out, similar to a measuring cord or a measuring tape.
- One end 149 is close to the measuring point, for. B. brought up to the surface of a wall 24 or attached in individual cases by a hook or other link.
- the other end of the straight piece lies on a measuring mark of the coil 160, the measuring mark being the edge of the
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Optical Transform (AREA)
Abstract
Description
Claims
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEP3926457.2 | 1989-08-10 | ||
DE19893926457 DE3926457A1 (de) | 1989-08-10 | 1989-08-10 | Mess- oder ueberwachungsvorrichtung |
DEP4021119.3 | 1990-07-03 | ||
DE19904021119 DE4021119A1 (de) | 1990-07-03 | 1990-07-03 | Sensorvorrichtung |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1991002221A1 true WO1991002221A1 (de) | 1991-02-21 |
Family
ID=25883901
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1990/001287 WO1991002221A1 (de) | 1989-08-10 | 1990-08-07 | Faseroptische sensorvorrichtung |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0530182A1 (de) |
WO (1) | WO1991002221A1 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4242546A1 (de) * | 1992-12-16 | 1994-06-23 | Richter Thomas | Technische Gläser in auto-radialen Verbunden zur Erfassung physikalischer Größen |
WO2006010753A1 (de) * | 2004-07-23 | 2006-02-02 | Siemens Aktiengesellschaft | Kraftsensor |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4358678A (en) * | 1980-11-19 | 1982-11-09 | Hersey Products, Inc. | Fiber optic transducer and method |
EP0126223A2 (de) * | 1983-05-23 | 1984-11-28 | Trw Inc. | Kontrollapparat |
FR2584348A1 (fr) * | 1985-07-02 | 1987-01-09 | Derre Andre | Procede de surveillance et de signalement de l'etat d'ecrasement des pneumatiques d'un vehicule en mouvement et dispositif pour sa mise en oeuvre |
EP0208562A2 (de) * | 1985-07-12 | 1987-01-14 | Eldec Corporation | Fiberoptischer Sensor |
EP0288139A2 (de) * | 1987-02-26 | 1988-10-26 | The University Of Liverpool | Faseroptischer Sensor |
US4788868A (en) * | 1986-03-27 | 1988-12-06 | The Charles Stark Draper Laboratory, Inc. | Strain measurement apparatus and method |
-
1990
- 1990-08-07 EP EP90912602A patent/EP0530182A1/de not_active Withdrawn
- 1990-08-07 WO PCT/EP1990/001287 patent/WO1991002221A1/de not_active Application Discontinuation
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4358678A (en) * | 1980-11-19 | 1982-11-09 | Hersey Products, Inc. | Fiber optic transducer and method |
EP0126223A2 (de) * | 1983-05-23 | 1984-11-28 | Trw Inc. | Kontrollapparat |
FR2584348A1 (fr) * | 1985-07-02 | 1987-01-09 | Derre Andre | Procede de surveillance et de signalement de l'etat d'ecrasement des pneumatiques d'un vehicule en mouvement et dispositif pour sa mise en oeuvre |
EP0208562A2 (de) * | 1985-07-12 | 1987-01-14 | Eldec Corporation | Fiberoptischer Sensor |
US4788868A (en) * | 1986-03-27 | 1988-12-06 | The Charles Stark Draper Laboratory, Inc. | Strain measurement apparatus and method |
EP0288139A2 (de) * | 1987-02-26 | 1988-10-26 | The University Of Liverpool | Faseroptischer Sensor |
Non-Patent Citations (1)
Title |
---|
Electronics and Communications in Japan, Teil 2, Band 69, Nr. 2, 1986, Scripta Technica, Inc., (Silver Spring, Maryland, US), H. TAYA et al.: "Displacement Sensors and Displacement Signal Coding Circuits Using Twisted and Bent Dual-Core Fiber", seiten 74-83 siehe den ganzen artikel * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4242546A1 (de) * | 1992-12-16 | 1994-06-23 | Richter Thomas | Technische Gläser in auto-radialen Verbunden zur Erfassung physikalischer Größen |
WO2006010753A1 (de) * | 2004-07-23 | 2006-02-02 | Siemens Aktiengesellschaft | Kraftsensor |
DE102004035816B4 (de) * | 2004-07-23 | 2008-07-03 | Siemens Ag | Kraftsensor |
Also Published As
Publication number | Publication date |
---|---|
EP0530182A1 (de) | 1993-03-10 |
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