NO144231B - MEASURING PROBLEM FOR MEASURING SURFACE Wear. - Google Patents
MEASURING PROBLEM FOR MEASURING SURFACE Wear. Download PDFInfo
- Publication number
- NO144231B NO144231B NO753154A NO753154A NO144231B NO 144231 B NO144231 B NO 144231B NO 753154 A NO753154 A NO 753154A NO 753154 A NO753154 A NO 753154A NO 144231 B NO144231 B NO 144231B
- Authority
- NO
- Norway
- Prior art keywords
- gap
- wear
- magnetic circuit
- measuring
- core
- Prior art date
Links
- 230000005291 magnetic effect Effects 0.000 claims description 27
- 239000000523 sample Substances 0.000 claims description 27
- 239000000463 material Substances 0.000 claims description 14
- 230000035699 permeability Effects 0.000 claims description 6
- 238000009958 sewing Methods 0.000 claims 1
- 239000000314 lubricant Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 230000006378 damage Effects 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 235000013601 eggs Nutrition 0.000 description 1
- 239000012777 electrically insulating material Substances 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/001—Constructional details of gauge heads
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
- G01B7/06—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness
- G01B7/10—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness using magnetic means, e.g. by measuring change of reluctance
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/56—Investigating resistance to wear or abrasion
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
- Braking Arrangements (AREA)
- Length Measuring Devices With Unspecified Measuring Means (AREA)
Description
Oppfinnelsen angår en målesonde for måling av overflateslitasje på maskindeler under gjennomføring av en selv-induksjonsmåling og omfattende en magnetisk krets av et materiale med stor magnetisk permeabilitet. The invention relates to a measuring probe for measuring surface wear on machine parts during a self-induction measurement and comprising a magnetic circuit of a material with high magnetic permeability.
Til måling av tykkelser av ferromagnetiske materialer For measuring the thickness of ferromagnetic materials
er det kjent å anvende induktive målesonder, som omfatter en magnetisk krets som anbringes på det legeme hvis tykkelse skal måles. Legemet inngår i den magnetiske kretsen, og når dette legemets tykkelse endres, f.eks. ved slitasje, oppstår det en tilsvarende endring av reluktansen i den magnetiske kretsen, it is known to use inductive measuring probes, which comprise a magnetic circuit which is placed on the body whose thickness is to be measured. The body is part of the magnetic circuit, and when this body's thickness changes, e.g. in case of wear, a corresponding change of the reluctance in the magnetic circuit occurs,
og denne endring av reluktansen gir et mål for den forekommende slitasje. and this change in reluctance provides a measure of the wear occurring.
En slik oppstilling har, spesielt i de tilfeller der Such an arrangement has, especially in those cases where
man f.eks. ønsker å måle sylinderslitasjen i en motor, den ulempe at målesonden ikke kan være særlig følsom, ettersom den må anbringes utvendig på sylinderveggen. Den forekommende nedsettelse av legemets tykkelse, dvs. av sylinderveggens tykkelse innvirker bare i liten grad på den magnetiske reluktansen, og da sylinderveggen vanligvis har ganske stor tykkelse, kan den resulterende reluktansendring i den magnetiske krets ikke bli særlig stor. En annen ulempe ved den kjente oppstilling er at sylinderveggen eller en annen maskindel ikke nødvendigvis er beregnet til anbringelse av en slik målesonde, one e.g. want to measure the cylinder wear in an engine, the disadvantage is that the measuring probe cannot be very sensitive, as it must be placed externally on the cylinder wall. The occurring reduction in the thickness of the body, i.e. of the thickness of the cylinder wall, only affects the magnetic reluctance to a small extent, and as the cylinder wall usually has a fairly large thickness, the resulting reluctance change in the magnetic circuit cannot be very large. Another disadvantage of the known arrangement is that the cylinder wall or another machine part is not necessarily intended for placing such a measuring probe,
og det må derfor tas særlige forholdsregler for å kunne an- and special precautions must therefore be taken to be able to
bringe målesonden et passende sted på sylinderveggen eller maskindelen. bring the measuring probe to a suitable place on the cylinder wall or machine part.
Oppfinnelsen tar sikte på å avhjelpe disse ulemper, The invention aims to remedy these disadvantages,
og med henblikk på dette er en målesonde ifølge oppfinnelsen karakterisert ved at spalten er av magnetisk inert materiale og at spaltens tykkelse er begrenset av to avsnitt av magnetkretsen og at flateutstrekningen av spalten på dens ene side begrensende flateområde av de to avsnittene er anordnet direkte og bindende med den flaten på maskindelen som er utsatt for slitasje, og at slitasjen dermed minsker spaltens areal. and with a view to this, a measuring probe according to the invention is characterized in that the gap is made of magnetically inert material and that the thickness of the gap is limited by two sections of the magnetic circuit and that the surface extent of the gap on one side of the limiting surface area of the two sections is arranged directly and binding with the surface of the machine part that is exposed to wear, and that the wear thus reduces the area of the gap.
Ved å anbringe målesondens magnetiske krets på en By placing the measuring probe's magnetic circuit on a
slik måte at spalten direkte utsettes for den forekommende slitasjepåvirkning, oppnås en vesentlig større følsomhet, in such a way that the gap is directly exposed to the wear effect that occurs, a significantly greater sensitivity is achieved,
eftersom reluktansen endres sterkt ved en nedsettelse av spaltens areal som følge av slitasjen. since the reluctance changes greatly when the area of the gap is reduced as a result of the wear.
Til måling av slitasjen på maskindeler, f.eks. sylinderslitasjen i en motor, er det forøvrig også kjent å anvende et i en spalte mellom elektroder anbragt motstands-legeme, som er innsatt i den maskindel som utsettes for slitasje, og å foreta en måling av endringen av den ohmske motstand i dette legeme under den forekommende slitasje. Vanligvis foretas det en likestrømsmåling. For measuring the wear on machine parts, e.g. cylinder wear in an engine, it is also known to use a resistance body placed in a gap between electrodes, which is inserted into the machine part that is exposed to wear, and to measure the change in the ohmic resistance in this body during the occurring wear and tear. A direct current measurement is usually carried out.
Denne metode har imidlertid forskjellige ulemper. However, this method has various disadvantages.
Det er fare for mekaniske beskadigelser, eventuelt brudd av motstandslegemet, når det innsettes i maskindelen. Motstands-verdien, som varierer med slitasjen, avhenger av f.eks. temperaturen i måleområdet, og kan påvirkes kjemisk eller korrosivt av smøremiddelet i maskinen. Det er dessuten fare for at smøremiddelet trenger inn mellom motstandslegemet og det isolasjonsmaterialet som nødvendigvis må anbringes mellom sonden og maskindelen, og her dannes forstyrrende alternative strømveier, som fører til misvisende måleresultater. Disse ulempene forekommer ikke ved målesonden ifølge oppfinnelsen. There is a risk of mechanical damage, possibly breaking the resistance body, when it is inserted into the machine part. The resistance value, which varies with wear, depends on e.g. the temperature in the measuring area, and can be chemically or corrosively affected by the lubricant in the machine. There is also a danger that the lubricant penetrates between the resistance body and the insulating material that must necessarily be placed between the probe and the machine part, and disturbing alternative current paths are formed here, which leads to misleading measurement results. These disadvantages do not occur with the measuring probe according to the invention.
I henhold til en utførelsesform for oppfinnelsen er målesonden karakterisert ved at sonden er utformet som en stift innsatt i maskindelen, at den oppfatter dels en avlang sentralkjerne av materiale med stor magnetisk permeabilitet, dels minst en om kjernen anbragt spole, dels en utvendig kappe som omgir spolen og kjernen, av et materiale med stor magnetisk permeabilitet, dels en mellom kjernen og kappen anbragt over kjernens ene ende beliggende spalte fylt med magnetisk inert materiale, og at kjernens, spaltens og kappens endeflater i den ene ende av stiften er utformet slik at de ligger i plan med maskindelens overflate, som utsettes for slitasje, idet spolen er innkoplet i en induksjonsmålekrets. According to one embodiment of the invention, the measuring probe is characterized by the fact that the probe is designed as a pin inserted in the machine part, that it perceives partly an oblong central core of material with high magnetic permeability, partly at least one coil placed around the core, partly an outer jacket that surrounds the coil and the core, made of a material with high magnetic permeability, partly a gap between the core and the sheath placed over one end of the core filled with magnetically inert material, and that the end surfaces of the core, the gap and the sheath at one end of the pin are designed so that they lies flush with the machine part's surface, which is exposed to wear, as the coil is connected to an induction measuring circuit.
Når stiftens endeflate i plan med maskindelens overflate utsettes for slitasje, minskes spaltens areal. Da selvinduksjon av spolen i den pågjeldende magnetiske krets avhenger dels av spolens viklingstall, dels av arealet og bredden av spalten, og da arealet av spalten er den eneste When the end surface of the pin flush with the surface of the machine part is exposed to wear, the area of the gap is reduced. Since the self-induction of the coil in the magnetic circuit in question depends partly on the winding number of the coil, partly on the area and width of the slot, and since the area of the slot is the only
størrelse som her endres ved .slitasje, vil spolens selvinduk- size that here changes due to wear, the coil's self-inductance
sjon minskes proporsjonalt med slitasjen. Målesonden vil derfor ved induksjonsmålekretsen direkte gi en indikasjon om den \ forekommende slitasje. Med den kompakte og solide konstruksjon j som her oppnås, kan sonden innsettes i maskindelen uten fare ' || for mekanisk ødeleggelse, og sonden påvirkes ikke ay smøre- f middelet. Det er dessuten ingen fare for kjemiske angrep, fra smøremiddelet og derfor ingen fare for feil slitasjemåiing. tion is reduced proportionally with the wear. With the induction measuring circuit, the measuring probe will therefore directly give an indication of the wear occurring. With the compact and solid construction j achieved here, the probe can be inserted into the machine part without danger ' || for mechanical destruction, and the probe is not affected by the lubricant. There is also no risk of chemical attack from the lubricant and therefore no risk of incorrect wear measurement.
I henhold til en ytterligere utførelsesform for.oppfinnelsen kan det omkring kjernen og under kappen være enda en fra den førstnevnte spole adskilt spole, hvis tilhørende magnetiske krets omfatter en del av "kjernen, og en del av kappen har en spalte av konstant størrelse. 33en annen spole og den ^tilhørende magnet!sTce krets har en konstant reiuktans eftersom spalten har konstant størrelse, og derfor kan denne According to a further embodiment of the invention, around the core and under the sheath there may be another coil separated from the first-mentioned coil, whose associated magnetic circuit includes part of the core, and part of the sheath has a gap of constant size. second coil and the associated magnetic circuit have a constant reiuctance since the gap has a constant size, and therefore this can
spole inngå som referansespole i målekretsen-, som f-eks. kan være en målebrokopling- Medsenne referansespole kan man coil included as a reference coil in the measuring circuit-, such as e.g. can be a measuring bridge connection - Medsenne reference coil one can
således oppnåen kompensasjon av temper a tur inn f ly tei sen. thus achieving temperature compensation in the flow path.
Oppfinnelsen skai i det følgende forklares nærmere under henvisning til den skjematiske tegning som viser en utførelsesform for en målesonde ifølge oppfinnelsen. In the following, the invention shall be explained in more detail with reference to the schematic drawing which shows an embodiment of a measuring probe according to the invention.
Målesonden omfatter en sentral, i det vesentlige sylindrisk, avlang kjerne 1 som er utformet med to rundt- The measuring probe comprises a central, essentially cylindrical, elongated core 1 which is designed with two round
gående flenser 2,3, som er beliggende i en viss avstand fra hverandre og hvorav den ene er beliggende ved den ene ende av kjernen 1. Kjernene 1 består av et materiale med stor magnetisk permeabilitet. running flanges 2,3, which are located at a certain distance from each other and one of which is located at one end of the core 1. The cores 1 consist of a material with high magnetic permeability.
Omkring kjernen 1 og mellom de to rundtgående flensene 2 og 3 er det anbragt en rundt kjernen viklet spole 4 og på den andre siden av flensen 2 er det anbragt enda en spole 5 omkring kjernen 1. Around the core 1 and between the two circumferential flanges 2 and 3 there is a coil 4 wound around the core and on the other side of the flange 2 another coil 5 is placed around the core 1.
vP. vP.
Kjernen 1 og de to omkring kjernen anbragte spolene The core 1 and the two around the core placed the coils
4 og 5 er omgitt av en rundt-gående kappe 6 som også består av et materiale med stor magnetisk permeabilitet. Kappen, hvis ytterside 7 har en svak konisitet, som på tegningen er overdrevet, er beregnet til innpressing i et hull mad til- *XP, -v svarende konisitet i den maskindel 8, f.eks. sylinderveggen i 4 and 5 are surrounded by a circumferential sheath 6 which also consists of a material with high magnetic permeability. the cape, whose outer side 7 has a slight taper, which is exaggerated in the drawing, is intended for pressing into a hole to *XP, -v corresponding taper in the machine part 8, e.g. the cylinder wall i
en dieselmotor, som utsettes for slitasje og hvis slitasje kan måles ved hjelp av sonden. a diesel engine, which is subject to wear and whose wear can be measured using the probe.
Kappen 6 dimensjoneres slik at dens endeflate 6a ligger i plan med den overflaten 11 av maskindelen 8 som ér The cover 6 is dimensioned so that its end surface 6a lies flush with the surface 11 of the machine part 8 which is
utsatt forslitasje. exposed to wear and tear.
Spolen 5 strekker seg over bare en del av lengden The coil 5 extends over only part of its length
fra flensen 2 til den frie ende av kjernen 1 og lar kjernens endestykke Kappen er utformet slik at dens innerdiameter i området omkring spolen 5 er litt større enn from the flange 2 to the free end of the core 1 and leaves the end piece of the core The cap is designed so that its inner diameter in the area around the coil 5 is slightly larger than
spolens ytterdiameter og i området omkring kjernens frie endestykke 1a er litt større enn kjernens ytterdiameter. the coil's outer diameter and in the area around the core's free end piece 1a is slightly larger than the core's outer diameter.
Dette mellomrom mellom kappens innerflate og henholds- This space between the inner surface of the jacket and the
vis spolen 5 og kjernens endestykke 1a er fylt med et magnetisk inert materiale, f.eks. plastmateriale, som mellom kjernen 1 show the coil 5 and the end piece 1a of the core are filled with a magnetically inert material, e.g. plastic material, as between the core 1
og kappen 6 danner en spalte 12 i den magnetiske'krets som er knyttet til spolen 5. Endeflaten på kjernens endestykke 1a og spaltens endeflate ligger i plan med kappens 6 endeflate 6a, dvs. i plan med den for slitasje utsatte overflate 11. and the sheath 6 forms a gap 12 in the magnetic circuit which is connected to the coil 5. The end face of the core end piece 1a and the end face of the gap lie flush with the end face 6a of the sheath 6, i.e. flush with the surface 11 exposed to wear.
I den motsatte ende av sonden er det mellom kappens endeflate og flensen 3 innsatt en ring 13 av f.eks. plastmateriale eller fortrinnsvis duktilt, magnetisk inert materiale, såsom kobber, som danner en spalte i den magnetiske kretsen som er knyttet til spolen 4. At the opposite end of the probe, a ring 13 of e.g. plastic material or preferably ductile, magnetically inert material, such as copper, which forms a gap in the magnetic circuit connected to the coil 4.
I den bakerste ende av sonden, dvs. den bort fra slitasjeflaten vendende ende har kappen 6 et påstøpt eller påsatt hylster 15 av elektrisk isolerende materiale av f.eks. At the rear end of the probe, i.e. the end facing away from the wear surface, the sheath 6 has a molded or attached sleeve 15 of electrically insulating material of e.g.
samme art som materialet i spalten. Ledninger 14 til og fra spolene henholdsvis 4 og 5 er ført ut f.eks. gjennom den bak- same species as the material in the column. Wires 14 to and from the coils 4 and 5 respectively are led out, e.g. through the rear
erste flens 3 og gjennom hylsteret 15. Til strekkavlastning kan disse ledningene eventuelt være fastspent til flensen 3 first flange 3 and through the sleeve 15. For strain relief, these wires can possibly be clamped to flange 3
ved hjelp av en ikke vist bøyle og derefter ført ut gjennom hylsteret 15. by means of a hoop not shown and then led out through the casing 15.
Sondens virkemåte forklares nedenfor: The operation of the probe is explained below:
Det tilveiebringes i den maskindel hvis ene overflate utsettes for slitasje et konisk hull av en slik størrelse at sonden kan presses inn i dette, og at sondens ..forreste, endeflate, jdvs. kjernens, spaltens og kappens endeflate ligger, i A conical hole of such a size that the probe can be pressed into it is provided in the machine part whose one surface is exposed to wear, and that the probe's ..front, end surface, i.e. the end surface of the core, slot and sheath lies, i
p-l-an med den né.witen£iffasfe^n^sltoJv?1ri|]tateJfels Qver<f->p-l-an with the né.witen£iffasfe^n^sltoJv?1ri|]tateJfels Qver<f->
De to spolen<e>d4 egg, ip0i^op^egge^ impedans målebro The two coil<e>d4 eggs, ip0i^op^egge^ impedance measuring bridge
som mates medsveik giialsgengjng/eigeid:1kio)n;sl£arit frekvens. Den magnetiske krefa§ests@meer:r|s^^^e|0^iJrsgole^e4 har en konstant reluktans^eftersama.de^SeSEiiSg^ hvorfor-spolen har enspodeife'Mgsegj^liggekonsfa^t1im|iedans^_ which is fed with weak giialsgenggjn/owned:1kio)n;sl£arit frequency. The magnetic krefa§ests@meer:r|s^^^e|0^iJrsgole^e4 has a constant reluctance^eftersama.de^SeSEiiSg^ why the coil has enspodeife'Mgsegj^liggekonsfa^t1im|iedans^_
4 danner ref era.rtø.end-r bfgkgPiÅggen-brokoplingen _ 4 forms the ref era.rtø.end-r bfgkgPiÅggen bridge connection _
Når maskindele^ i§a<g>ftTfitéetøs H overffa'teUtSetteS (olg^^ja2,o^<å>1 jf s^t^s^e .fo Dette kappens" eridef&a^eaief/eiSJ^J-Jien^ A2 ende-f.late, .samt. kjernens endeflate 1b esMgtiélSalie deji ^jed^^<L>lfin^^ p^^e^n^jigen. angitte retning. Da isp^ljans. 5 i^il^ijd^ksj^r^a^^^ spolens viklingstall ^gUaivica^ejilielQ^g^br^^ i.det den er proporsjona-1 p^e^o^eja^tj cPTO^tP^^™^1 med bredden, val bspolfenis 5/iste^v^4;,n^^IseIl:vIl^es proporsjonalt med slitas jeni^deMeÆsiame^ areal. Herved minskélsrs^talgasis^ie^Bfj^rins ^v<2mf>eaansman\^ ^ro_ koplingen konepa.tj,e.r)e.E e.njn§^]£jrigra^nl^evektstilstanden som med god tilnærmelse: laø<y>^fe^g^iggjjgygenj^forekommgnde slitasje. When machine parts^ i§a<g>ftTfitéetøs H overffa'teUtSetteS (olg^^ja2,o^<å>1 jf s^t^s^e .fo This coat's" eridef&a^eaief/eiSJ^J-Jien^ A2 end-f.late, .as well as the end face of the core 1b esMgtiélSalie deji ^jed^^<L>lfin^^ p^^e^n^jigen. specified direction. Then isp^ljans. 5 i^il^ijd^ksj^ r^a^^^ the winding number of the coil ^gUaivica^ejilielQ^g^br^^ i.it it is proportiona-1 p^e^o^eja^tj cPTO^tP^^™^1 with the width, val bspolfenis 5/ iste^v^4;,n^^IseIl:vIl^es proportional to the area of the wear jeni^deMeÆsiame^ Hereby minskélsrs^talgasis^ie^Bfj^rins ^v<2mf>eaansman\^ ^ro_ the connection konepa.tj,e.r )e.E e.njn§^]£jrigra^nl^eweight condition which with a good approximation: laø<y>^fe^g^iggjjgygenj^occurring wear.
Endringen avES§iu&|afts<gn> je<de>j<>>tmagnetiske omfatter spodena5tekunp§iigr^yr^gnogså0givuttrvkk.for den forekommendefsid]tai§ij@ndévis-[fpo^.fin |5^jLnnkop^Les ^ en resonans-krets. I såif.adftsyilldenf nødv^nd målef rekvensen til gjenopprette^&icapp^fejso^^ uttrykk for slita?S"jef.or slitasje. The change of ES§iu&|afts<gn> je<de>j<>>tspodena5tekunp§iigr^yr^gnogså0givuttrvkk.for the occurringdefsid]tai§ij@ndévis-[fpo^.fin |5^jLnnkop^Les ^ en resonant circuit. In soif.adftsyilldenf needv^nd measuref the requency to restore^&icapp^fejso^^ expression of wear?S"jef.or wear.
Claims (1)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2445111A DE2445111C3 (en) | 1974-09-20 | 1974-09-20 | Device for measuring changes in the area of machine parts by inductive means |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| NO753154L NO753154L (en) | 1976-03-23 |
| NO144231B true NO144231B (en) | 1981-04-06 |
| NO144231C NO144231C (en) | 1981-07-22 |
Family
ID=5926372
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO753154A NO144231C (en) | 1974-09-20 | 1975-09-16 | MEASURING PROBLEM FOR MEASURING SURFACE Wear. |
Country Status (18)
| Country | Link |
|---|---|
| JP (1) | JPS5651562B2 (en) |
| BE (1) | BE833450A (en) |
| BR (1) | BR7506067A (en) |
| DE (1) | DE2445111C3 (en) |
| DK (1) | DK133915C (en) |
| ES (1) | ES441087A1 (en) |
| FI (1) | FI58837C (en) |
| FR (1) | FR2285594A1 (en) |
| GB (1) | GB1518165A (en) |
| IE (1) | IE41700B1 (en) |
| IN (1) | IN144088B (en) |
| IT (1) | IT1047193B (en) |
| NL (1) | NL184026C (en) |
| NO (1) | NO144231C (en) |
| PL (1) | PL104502B1 (en) |
| SE (1) | SE406124B (en) |
| SU (1) | SU655342A3 (en) |
| YU (1) | YU37400B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2346713A1 (en) * | 1975-10-01 | 1977-10-28 | Semt | METHOD OF DETERMINING THE DEGREE OF WEAR OF AN ELEMENT WITH DETERMINED MAGNETIC PROPERTIES IN SLIDING CONTACT WITH A SECOND ELEMENT |
| DE2908114A1 (en) * | 1979-03-02 | 1980-09-11 | Fortuna Werke Maschf Ag | METHOD FOR MEASURING THE ABRASION OF ANY OR SEVERAL SURFACE PARTS OF A ROTATING BODY OF ANOTHER FIXED BODY AND DEVICE FOR CARRYING OUT THE METHOD |
| JPH0313603Y2 (en) * | 1985-03-05 | 1991-03-28 | ||
| US4810964A (en) * | 1986-01-22 | 1989-03-07 | Kamyr Ab | Method and apparatus for measuring the distance between a measuring transducer and an opposing surface, particularly with paper pulp equipment |
| GB2270383A (en) * | 1992-08-29 | 1994-03-09 | Martin Robin Bowman | Electronic wearaway sensor |
| GB2455968B (en) | 2007-11-21 | 2010-06-09 | Rolls Royce Plc | Turbomachine having an apparatus to measure the clearance between a rotor blade tip and a stator liner of a stator casing |
| US8056606B2 (en) | 2009-10-26 | 2011-11-15 | General Electric Company | Methods of making and using ceramic metallic interlocked components |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1224972B (en) * | 1961-02-10 | 1966-09-15 | Licentia Gmbh | Safety device for machines with rotating parts in plain bearings |
| DE975225C (en) * | 1954-08-29 | 1961-10-05 | Siemens Ag | Device for inductive gap measurement in gas and steam turbines |
| DE1004387B (en) * | 1955-08-29 | 1957-03-14 | Siemens Ag | Device for inductive measurement of the radial or axial play of rotating machines, in particular of steam turbines |
| SU133033A1 (en) * | 1960-04-30 | 1960-11-30 | А.М. Савченко | Ferropoint method of studying the displacement of metal during plastic deformation |
| US3236096A (en) * | 1962-03-06 | 1966-02-22 | Nanmac Corp | Electrical gauge for sensing the amount of erosion of a solid material |
| DE1680104A1 (en) * | 1968-02-19 | 1971-11-11 | Heidenreich Robert Dipl Ing | Function monitoring device for power transmission devices, especially for brake systems and clutches in motor vehicles |
| DD90870A1 (en) * | 1971-05-10 | 1972-06-20 | Method for measuring the wear mark width of indexable inserts | |
| DE2123750A1 (en) * | 1971-05-13 | 1972-11-30 | Bosch Gmbh Robert | Device for measuring the lining thickness of friction parts, in particular of brake linings |
-
1974
- 1974-09-20 DE DE2445111A patent/DE2445111C3/en not_active Expired
-
1975
- 1975-09-15 IE IE2013/75A patent/IE41700B1/en unknown
- 1975-09-16 BE BE160067A patent/BE833450A/en not_active IP Right Cessation
- 1975-09-16 DK DK413375A patent/DK133915C/en not_active IP Right Cessation
- 1975-09-16 NO NO753154A patent/NO144231C/en unknown
- 1975-09-17 NL NLAANVRAGE7510956,A patent/NL184026C/en active Search and Examination
- 1975-09-18 GB GB38365/75A patent/GB1518165A/en not_active Expired
- 1975-09-19 FR FR7528794A patent/FR2285594A1/en active Granted
- 1975-09-19 FI FI752629A patent/FI58837C/en not_active IP Right Cessation
- 1975-09-19 PL PL1975183440A patent/PL104502B1/en unknown
- 1975-09-19 SU SU752175640A patent/SU655342A3/en active
- 1975-09-19 SE SE7510519A patent/SE406124B/en not_active IP Right Cessation
- 1975-09-19 YU YU2370/75A patent/YU37400B/en unknown
- 1975-09-19 JP JP11356075A patent/JPS5651562B2/ja not_active Expired
- 1975-09-19 ES ES441087A patent/ES441087A1/en not_active Expired
- 1975-09-19 BR BR7506067*A patent/BR7506067A/en unknown
- 1975-09-19 IT IT69339/75A patent/IT1047193B/en active
-
1976
- 1976-02-18 IN IN290/CAL/1976A patent/IN144088B/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| FR2285594B1 (en) | 1978-04-07 |
| PL104502B1 (en) | 1979-08-31 |
| IT1047193B (en) | 1980-09-10 |
| NL7510956A (en) | 1976-03-23 |
| SU655342A3 (en) | 1979-03-30 |
| IE41700B1 (en) | 1980-02-27 |
| FR2285594A1 (en) | 1976-04-16 |
| JPS5157467A (en) | 1976-05-19 |
| SE406124B (en) | 1979-01-22 |
| BR7506067A (en) | 1976-08-03 |
| FI752629A (en) | 1976-03-21 |
| DK413375A (en) | 1976-03-21 |
| DE2445111C3 (en) | 1986-02-13 |
| NO753154L (en) | 1976-03-23 |
| GB1518165A (en) | 1978-07-19 |
| DK133915C (en) | 1977-01-17 |
| DE2445111A1 (en) | 1976-04-01 |
| NO144231C (en) | 1981-07-22 |
| IN144088B (en) | 1978-03-25 |
| DK133915B (en) | 1976-08-09 |
| FI58837B (en) | 1980-12-31 |
| BE833450A (en) | 1976-01-16 |
| DE2445111B2 (en) | 1980-05-08 |
| IE41700L (en) | 1976-03-20 |
| SE7510519L (en) | 1976-03-22 |
| YU37400B (en) | 1984-08-31 |
| JPS5651562B2 (en) | 1981-12-07 |
| FI58837C (en) | 1981-04-10 |
| ES441087A1 (en) | 1977-03-16 |
| NL184026C (en) | 1989-03-16 |
| YU237075A (en) | 1983-04-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5432444A (en) | Inspection device having coaxial induction and exciting coils forming a unitary coil unit | |
| US3626291A (en) | Current-measuring apparatus | |
| US7126343B1 (en) | Conductivity probe with toroid keeper | |
| US3834234A (en) | Level gauge of liquid metal | |
| JPH0812082B2 (en) | Non-contact distance measuring system and non-contact distance measuring method | |
| NO144231B (en) | MEASURING PROBLEM FOR MEASURING SURFACE Wear. | |
| US4204159A (en) | Eddy-current test probe with segmented circumferential test gap and method for inspection of materials | |
| US3688187A (en) | Eddy current position transducer utilizing a coil whose impedance is made substantially ohmic | |
| US2033654A (en) | Magnetic measurement | |
| GB574618A (en) | Means for the determination of the eccentricity of the conductor with regard to the dielectric in insulated wires and cables | |
| GB881495A (en) | Probe device for flaw detection | |
| US2921255A (en) | Apparatus for indicating the number of turns of an electrical coil | |
| GB1476758A (en) | Device for measuring the level of an electrically conductive liquid in a container | |
| US2471417A (en) | Device for locating faults in cables | |
| FR3096692B1 (en) | Device comprising at least one elastic textile piece equipped with an inductive elongation sensor wire, use of such a device and method of measuring the variation in the inductance of a magnetic coil created by said inductive elongation sensor wire . | |
| EP2130056B1 (en) | Fluxgate sensor | |
| US3996801A (en) | Liquid metal level sensor with increased sensitivity | |
| US2439970A (en) | Polarized armature electrical instrument | |
| US3185923A (en) | Magnetic inspection device having variable intensity audible alarm means responsive to spacing between device and test piece | |
| GB1070859A (en) | Apparatus for the measurement of changes in diameter of wire or tubular metal and a method for the determination of the corrosion of such metal | |
| US2689331A (en) | Apparatus for testing electromagnetic fields | |
| US20230068057A1 (en) | Coil Arrangement and Torque Sensor with Coil Arrangement | |
| JP2005077203A (en) | Method and apparatus for measuring permeability | |
| KR101364684B1 (en) | Unit for Detecting Magnetic Leakage Flux Using Electromagnetic Induction and Non-destructive Testing System and Method Using th Same | |
| SU187898A1 (en) | ELECTRODE SUPPORT FOR CONTACT SPOT WELDING MACHINES |