CA1256219A - Device for measuring the thickness profile of rolled sheet metal bands - Google Patents
Device for measuring the thickness profile of rolled sheet metal bandsInfo
- Publication number
- CA1256219A CA1256219A CA000484329A CA484329A CA1256219A CA 1256219 A CA1256219 A CA 1256219A CA 000484329 A CA000484329 A CA 000484329A CA 484329 A CA484329 A CA 484329A CA 1256219 A CA1256219 A CA 1256219A
- Authority
- CA
- Canada
- Prior art keywords
- radiation
- sheet metal
- slit diaphragm
- measuring
- slit
- 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.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B15/00—Measuring arrangements characterised by the use of electromagnetic waves or particle radiation, e.g. by the use of microwaves, X-rays, gamma rays or electrons
- G01B15/04—Measuring arrangements characterised by the use of electromagnetic waves or particle radiation, e.g. by the use of microwaves, X-rays, gamma rays or electrons for measuring contours or curvatures
- G01B15/045—Measuring arrangements characterised by the use of electromagnetic waves or particle radiation, e.g. by the use of microwaves, X-rays, gamma rays or electrons for measuring contours or curvatures by measuring absorption
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B15/00—Measuring arrangements characterised by the use of electromagnetic waves or particle radiation, e.g. by the use of microwaves, X-rays, gamma rays or electrons
- G01B15/02—Measuring arrangements characterised by the use of electromagnetic waves or particle radiation, e.g. by the use of microwaves, X-rays, gamma rays or electrons for measuring thickness
- G01B15/025—Measuring arrangements characterised by the use of electromagnetic waves or particle radiation, e.g. by the use of microwaves, X-rays, gamma rays or electrons for measuring thickness by measuring absorption
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Length-Measuring Devices Using Wave Or Particle Radiation (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
- Length Measuring Devices With Unspecified Measuring Means (AREA)
Abstract
ABSTRACT
The invention describes apparatus for measuring the thickness profile of rolled sheet metal pieces and sheet metal bands with an X-ray tube and a movable slit diaphragm, positioned closely therebefore, with the X-rays penetrating the sheet metal to be measured and with the degree of absorption yielding a measurement of the thickness of the sheet metal.
According to the invention, a very great number of measurements can be carried out very accurately because the slit diaphragm has the form of a circular ring and is rotated around the X-ray tube by a drive means and has a considerable number of slits.
The invention describes apparatus for measuring the thickness profile of rolled sheet metal pieces and sheet metal bands with an X-ray tube and a movable slit diaphragm, positioned closely therebefore, with the X-rays penetrating the sheet metal to be measured and with the degree of absorption yielding a measurement of the thickness of the sheet metal.
According to the invention, a very great number of measurements can be carried out very accurately because the slit diaphragm has the form of a circular ring and is rotated around the X-ray tube by a drive means and has a considerable number of slits.
Description
:~?,5~ 9 :
Device for measuring the thickness profile of rolled sheet metal bands The invention relates to a device for measuring the thickness profiles of rolled sheet metal pieces or sheet metal bands with an X-ray tube, with a movable diaphragm being closely arranged therehefore, radiation receiver being spacedly arranged and firmly installed along a line and directed toward the radiation, with the sheet metal piece or sheet metal band to be measured being passed through the radiation between the X-ray tube or the sli-t diaphragm and the radiation receivers in such a way that its width extends along the line of the firmly installed radiation receivers, and a processing device is connected to the radiation receivers and a transfer means of the slit position, said processing device being intended for determining the radiation absorption and the allocation of the thickness of the sheet metal band and the measuring ranges distributed over the width of the sheet metal bands, said processing device further being connected with a display device.
A device for measuring thickness profiles is known from German Patent Application OS 31 40 714 published April 28, 1983 in the names of ~lormann et al. It has the drawback that only relatively inaccurate measurements can be made. Due to the size of the receiver, it is not possible to subdivide the sheet metal band to be measured into narrow sections between which there are no unmeasured portions. A further shortcoming MLS/lcm . .
Device for measuring the thickness profile of rolled sheet metal bands The invention relates to a device for measuring the thickness profiles of rolled sheet metal pieces or sheet metal bands with an X-ray tube, with a movable diaphragm being closely arranged therehefore, radiation receiver being spacedly arranged and firmly installed along a line and directed toward the radiation, with the sheet metal piece or sheet metal band to be measured being passed through the radiation between the X-ray tube or the sli-t diaphragm and the radiation receivers in such a way that its width extends along the line of the firmly installed radiation receivers, and a processing device is connected to the radiation receivers and a transfer means of the slit position, said processing device being intended for determining the radiation absorption and the allocation of the thickness of the sheet metal band and the measuring ranges distributed over the width of the sheet metal bands, said processing device further being connected with a display device.
A device for measuring thickness profiles is known from German Patent Application OS 31 40 714 published April 28, 1983 in the names of ~lormann et al. It has the drawback that only relatively inaccurate measurements can be made. Due to the size of the receiver, it is not possible to subdivide the sheet metal band to be measured into narrow sections between which there are no unmeasured portions. A further shortcoming MLS/lcm . .
2~g is that the number of the radiation receivers used is very large. This makes the apparatus complicated and expensive.
U.S. Patent 3 866 047 discloses another device which obviates these drawbacks because it uses wide radiation receivers and a movable slit diaphragm.
The disadvantage of this apparatus resides in the fact that only a few measuring values can be obtained per second because the slit diaphragm can only be moved very slowly in an oscillating fashion since it must have a great mass for the purpose of screening when used for measuring sheet metal bands.
The reason is that in this case a high radiation energy is re~uired. This great mass also causes a swinging movement of the entire stand, whereby, especially in the case of having great distances between the source of radiation and the radiation receiver, small measuring areas are not possible.
The small number of measurements per second renders this apparatus unsuitable for supervising a fast-moving rolling mill. ~or use in a rolling mill, particularly in a wideband rolling mill, it is further necessary that a very large space is kept between the X-ray tube and the radiation receiver through which the sheet metal band to be measured is guided.
On a roll table the edge parts of the metal sheets often jump up and would destroy the measuring device if there were not a free space of more than 2000 mm above the roll table.
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It is an object of the invention to provide a measuring apparatus Eor use in a rolling mill oe on roll tables which yields a very large number of measuring values per second, wherein for the purpose of a very great local resolution the sheet metal band is subdivided into very small stripes which are distributed over the width of the band, between which there are practically no gaps and wherein the distance between the slit diaphragm and the radiation receivers is very great for reasons of safety and an extremely good measuring accuracy is attained.
This object is achieved by having the slit diaphragm rotatably journaled in a circular arrangement around the part of the X-ray tube which emits the ~-rays and driven by a drive means.
An embodiment is described with the aid of Figs. l to
U.S. Patent 3 866 047 discloses another device which obviates these drawbacks because it uses wide radiation receivers and a movable slit diaphragm.
The disadvantage of this apparatus resides in the fact that only a few measuring values can be obtained per second because the slit diaphragm can only be moved very slowly in an oscillating fashion since it must have a great mass for the purpose of screening when used for measuring sheet metal bands.
The reason is that in this case a high radiation energy is re~uired. This great mass also causes a swinging movement of the entire stand, whereby, especially in the case of having great distances between the source of radiation and the radiation receiver, small measuring areas are not possible.
The small number of measurements per second renders this apparatus unsuitable for supervising a fast-moving rolling mill. ~or use in a rolling mill, particularly in a wideband rolling mill, it is further necessary that a very large space is kept between the X-ray tube and the radiation receiver through which the sheet metal band to be measured is guided.
On a roll table the edge parts of the metal sheets often jump up and would destroy the measuring device if there were not a free space of more than 2000 mm above the roll table.
~ .
MLS/lcm . . .. . . .
: -. - . . : . -. : . :
It is an object of the invention to provide a measuring apparatus Eor use in a rolling mill oe on roll tables which yields a very large number of measuring values per second, wherein for the purpose of a very great local resolution the sheet metal band is subdivided into very small stripes which are distributed over the width of the band, between which there are practically no gaps and wherein the distance between the slit diaphragm and the radiation receivers is very great for reasons of safety and an extremely good measuring accuracy is attained.
This object is achieved by having the slit diaphragm rotatably journaled in a circular arrangement around the part of the X-ray tube which emits the ~-rays and driven by a drive means.
An embodiment is described with the aid of Figs. l to
3.
Fig. l shows the apparatus with the X-ray tube and the slit diaphragm and the radiation receivers, Fig. 2 qives a view of those devices which are connected at the outside of the radiation receivers; and Fig. 3 illustrates a slit diaphragm which is composed of two rings.
The X-ray tube 11 is circularly surrounded by a slit diaphragm 12. The slit diaphragm is journaled by means of the three rollers 28, 29 t 30. One of these rollers is driven by a motor, accurately regulated in its speed of rotation.
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.. . .. .:
Fig. l shows the apparatus with the X-ray tube and the slit diaphragm and the radiation receivers, Fig. 2 qives a view of those devices which are connected at the outside of the radiation receivers; and Fig. 3 illustrates a slit diaphragm which is composed of two rings.
The X-ray tube 11 is circularly surrounded by a slit diaphragm 12. The slit diaphragm is journaled by means of the three rollers 28, 29 t 30. One of these rollers is driven by a motor, accurately regulated in its speed of rotation.
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.
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4 ~L25~
The speed o~ rotation can be uniform. However, it can also be variable and. m~y, for example, be coupled with the v~ri3ble band speed.
The slit diaphr~m 12 need ha.ve only one slit 13 if it has a relatively ~reat speed of rota.tion. If there is more than one slit in the slit di3~hra~m 12, the speed of rotation can be chosen smaller. It is favor~lble to have so many slits 13 that a radiation receiver is hit by a new ray at one of its ed~es shortly after the previous ray, passin~ at the opposite ed~e, has left it. In Fi~. 1 ten radiation receivers 14 to 23 are arranged below the sheet metal band to be measured.
They need a cone of ray~ which includes, for example, an an~le of about 36~. On the correspondin~ seEment of the slit diaphragm 12, which also includes an angle of about 36~ , a~ most only ten slits may be providel.
, At the be~inning of the line of radiation receivers an auxiliary detector 25 is arranged. The arr~r 26 at the : ;.
slit diaphra~m indicates tne direction of rotation of the 1it dia.phra~mO
The auxiliary detector 25 is first lmp1nEed by the ray from the slit 13. The detector causes a ~iEnal which starts the chopper 42. Thi~ cho per 42 su~divide~ into time intervals all measuring si~na1~ co~inE from t~e radiation receivers 14 to 23, which si~na.l~ la.st as long as a ra~ need~ to pas~ the width of a-mea~rin~ ran~e on the ~heet metal band 24. The width of the radiation receiver corresponds to several measurinE ranges.
. . .
,, :, . :,: ~ -_5_ ~ ~ S 6 2 ~ 9 The radiAtion receiver 14 shown in Fi~. 2 conta.ins five me3surin~ r3n~es which 3ra repre3ented by dashed lines and referenced 31 to 35. Of the radiation receiver 15 po~itioned a.~Jacent thereto~the measuring ran~es 36 to 39 are indicated. In Fi~. 2 the ray 40 whlch has Just passed the slit dia.phra.Em 12, is in the measurin~ ran~e 32, whereas the next followlnE slit in the slit diaphraEm 12 allow3 to pas3 a ray 41 onto the measurin~ r~n~e 37 of the followin~ radiation receiver 15. In Fi~. 1 only a. very few slits are illustr3ted. Many more sl~its would have to be pre3ent if~such a dense sequence~o~ rays i5 to be attained as is indicated in Fi~. 2 by the rays 40 and 41.
If the slit dla~hra~m 12 ls rotated ln the dlrection of the arrOw 26, the ray 40 passes the measurin~ran~es from the radl~tion receiver 14 ln the dlreotlon of~the radia.tion~
recelver 15. The ray 40 first impln~es~on t~he auxili~a.ry ~ ~ -detector 25, a.s a result of whlch it ~ives a:current impulse to the~chop~er. This lmpulse starts~ the~ chop~er 42. When~
the ray 40 PaSseS over the mea.surin~ ranEe 31, the ray is ; ~ :
waakened i.n accordance wlth the thlckness of the sheet metal band 24 to be penetr;t~ed. In~the radlatlon receiver 14 a current is~:created which depenas~on the intensity of ; ~ ;
the ray~ 40. This current flows via:the amplifier 43~and vi; the chopper:~42 to the tran;fer means 44 lnto the ; ~
processin~ de~ice 45 where it; i9 transformed~lnto a ~ ~ ;
mea;urlnE v3.lue oorrespondlnE to:the thickne;s of t~he~sheet metal band 24.~ Thls me;;urinE va~lùe~is pa~;sed on~to the ~ :
: - : : : . : : ~
:
.
~l~562~9 -6~
di3play unit 46. In addition to a display unit rurther devices, e.~. for correctinE the rollin~ operation, c3n be connectedO
The chopper 42 interrupts the current comin~ from all radiation receivers for a short time. Thq frequency of these interruptions aErees in its timin~ exactly to the number of slits 13 and to the speed of rota~tion o~ the slit dia~hraEm 12.
: "
In the transfer means 44 the number o~ current inter-ruptions of the chopper is also counted, i.e. as of the start cau3ed by the auxiliary detector~25.~ The ti~e between two interruptions of the chopper 42~corresponds to the time needed by the~ray 40~for~passln~over~the measu-rin~ ran~e 31, for example. The amplifler~43 imposes upon the output ourrent an ldentifloat~lon~siEnal w'nich differs from tne~i~dentification~ nal9~0~ the other amplifiers~which are connected at the outlet~side o~ the~
other radiation recelversO~The transfer means 44 rec~o~
nlzes from~the identification signal:, to whlch radiation~
recelver~the mea~surln~value belon~s; and the number~of~
interruptlon~ also~counted~by the~chopper 42,~tell~ the~
tr3nsfer~`means ln~which measurin~ ranE~e~of the respectlve~
redlatlon recelver the ray ls;at thls~tlme.~
The transfer means;44 gives~the measurlng value, together with the~si~nal belon~lng to~each measurlnE ran~e, to the ~;
procesRinE~d-v~ce 45.~ hls l~substantlally e~pro~remed ~, ~ : : :
: ~ :
: . . , , ~ . :
~;62~9 , com~uter which, ln a wa~ known per se, calculates tne thic'.mess o~ the sheet metal band 24 from the measured intensi.ty o the received ray, in which calculation any disturbin~ influences are corrected. It is, for example, tal~en into consideration and corrected tha.t the distrl-bution of intensity of the X-ray tube 11 over the width o~
the radiation window is not uniform. Also, the different len~ths of the path of the ray and the different an~le3 of incidence in the radiatlon recelver between ra.diation receivers which lie, for example, in the middle of the .~ :~
sheet metal band 24 and the edEe, or the different reception over the width of the radiation receiver, are corrected. :
The values of the various measurlng ra.n~es can be pa.ssed on to a dlsplay device 46, the display~panel of whlch is subdivlded into the same number of mea.surin~ ranEes.
A small strlpe on the display panel of~t:he~display devlce 46 corre~pond3 analoEously and with respect to lts positi~on to each measurln~ ran~e~31 to 39~ The~se~stripes a.re indi~
cated by d~shed lines. The values of thloknes3 of the~
sheet metal:band 24 can~be displayed diE~i:tally. However, ~ :
it is also~possible to show them by~dots~:on the display : ~ :
panel with the hei~ht of~each dot c~orresponding to the respect~ive thickness. The~dots can~also be interconnected ;
to form a~curve. And it is~`possible to attach any other kind of display deviceO ~ ~ ~
--The chopper is switched off by the counter in the transfer means 44 when it has rea.ched the number 5 in Fi~. 2.
A short pa.use follows:untll a new ra.y implnEes onto the auxiliary~detector 25.
. " ~ , ~ 2, S6t~d~ ~3 The synchronlza.tion between the slit diaphra~m 12 and the cho~per 42 becomes also possible by the fact that at the .:.
.
slit diaphr3~m 12 a reliable operatin~ counter of the number of revolutions la provlded w~ich is connected to frequency ~enerator in the chopper. The chopper can have the ~orm of a tri~Eer-impulse EeneratorO
3uitable for use as radlation recelvers are, for example, plastic scincillators which are connected at the outlet side in a known manner to photo~ultipliers and ampllflers or countin~ devices.
The slit diaphra~m can, a9 indlcated:ln~Fi~.. 3, also consist of two concentric rin~s:which are, for example, connected by ~pokes:47 and 48. It is:àlso~possible to use more than two:rinFs~
Due~to the:oonslderable measuring:resolut~ion the positl~on of the~sheet metal ed~es and~thUs the~wldth~ of the sheet:;~
metal~band~can be ea.sil,y; determlned.
The invention is:not restricted to the~described emb~odiment~
,, : - . -, :. ~ . . . ......................... . ..
. ~ . :... .. : , . . . ..
The speed o~ rotation can be uniform. However, it can also be variable and. m~y, for example, be coupled with the v~ri3ble band speed.
The slit diaphr~m 12 need ha.ve only one slit 13 if it has a relatively ~reat speed of rota.tion. If there is more than one slit in the slit di3~hra~m 12, the speed of rotation can be chosen smaller. It is favor~lble to have so many slits 13 that a radiation receiver is hit by a new ray at one of its ed~es shortly after the previous ray, passin~ at the opposite ed~e, has left it. In Fi~. 1 ten radiation receivers 14 to 23 are arranged below the sheet metal band to be measured.
They need a cone of ray~ which includes, for example, an an~le of about 36~. On the correspondin~ seEment of the slit diaphragm 12, which also includes an angle of about 36~ , a~ most only ten slits may be providel.
, At the be~inning of the line of radiation receivers an auxiliary detector 25 is arranged. The arr~r 26 at the : ;.
slit diaphra~m indicates tne direction of rotation of the 1it dia.phra~mO
The auxiliary detector 25 is first lmp1nEed by the ray from the slit 13. The detector causes a ~iEnal which starts the chopper 42. Thi~ cho per 42 su~divide~ into time intervals all measuring si~na1~ co~inE from t~e radiation receivers 14 to 23, which si~na.l~ la.st as long as a ra~ need~ to pas~ the width of a-mea~rin~ ran~e on the ~heet metal band 24. The width of the radiation receiver corresponds to several measurinE ranges.
. . .
,, :, . :,: ~ -_5_ ~ ~ S 6 2 ~ 9 The radiAtion receiver 14 shown in Fi~. 2 conta.ins five me3surin~ r3n~es which 3ra repre3ented by dashed lines and referenced 31 to 35. Of the radiation receiver 15 po~itioned a.~Jacent thereto~the measuring ran~es 36 to 39 are indicated. In Fi~. 2 the ray 40 whlch has Just passed the slit dia.phra.Em 12, is in the measurin~ ran~e 32, whereas the next followlnE slit in the slit diaphraEm 12 allow3 to pas3 a ray 41 onto the measurin~ r~n~e 37 of the followin~ radiation receiver 15. In Fi~. 1 only a. very few slits are illustr3ted. Many more sl~its would have to be pre3ent if~such a dense sequence~o~ rays i5 to be attained as is indicated in Fi~. 2 by the rays 40 and 41.
If the slit dla~hra~m 12 ls rotated ln the dlrection of the arrOw 26, the ray 40 passes the measurin~ran~es from the radl~tion receiver 14 ln the dlreotlon of~the radia.tion~
recelver 15. The ray 40 first impln~es~on t~he auxili~a.ry ~ ~ -detector 25, a.s a result of whlch it ~ives a:current impulse to the~chop~er. This lmpulse starts~ the~ chop~er 42. When~
the ray 40 PaSseS over the mea.surin~ ranEe 31, the ray is ; ~ :
waakened i.n accordance wlth the thlckness of the sheet metal band 24 to be penetr;t~ed. In~the radlatlon receiver 14 a current is~:created which depenas~on the intensity of ; ~ ;
the ray~ 40. This current flows via:the amplifier 43~and vi; the chopper:~42 to the tran;fer means 44 lnto the ; ~
processin~ de~ice 45 where it; i9 transformed~lnto a ~ ~ ;
mea;urlnE v3.lue oorrespondlnE to:the thickne;s of t~he~sheet metal band 24.~ Thls me;;urinE va~lùe~is pa~;sed on~to the ~ :
: - : : : . : : ~
:
.
~l~562~9 -6~
di3play unit 46. In addition to a display unit rurther devices, e.~. for correctinE the rollin~ operation, c3n be connectedO
The chopper 42 interrupts the current comin~ from all radiation receivers for a short time. Thq frequency of these interruptions aErees in its timin~ exactly to the number of slits 13 and to the speed of rota~tion o~ the slit dia~hraEm 12.
: "
In the transfer means 44 the number o~ current inter-ruptions of the chopper is also counted, i.e. as of the start cau3ed by the auxiliary detector~25.~ The ti~e between two interruptions of the chopper 42~corresponds to the time needed by the~ray 40~for~passln~over~the measu-rin~ ran~e 31, for example. The amplifler~43 imposes upon the output ourrent an ldentifloat~lon~siEnal w'nich differs from tne~i~dentification~ nal9~0~ the other amplifiers~which are connected at the outlet~side o~ the~
other radiation recelversO~The transfer means 44 rec~o~
nlzes from~the identification signal:, to whlch radiation~
recelver~the mea~surln~value belon~s; and the number~of~
interruptlon~ also~counted~by the~chopper 42,~tell~ the~
tr3nsfer~`means ln~which measurin~ ranE~e~of the respectlve~
redlatlon recelver the ray ls;at thls~tlme.~
The transfer means;44 gives~the measurlng value, together with the~si~nal belon~lng to~each measurlnE ran~e, to the ~;
procesRinE~d-v~ce 45.~ hls l~substantlally e~pro~remed ~, ~ : : :
: ~ :
: . . , , ~ . :
~;62~9 , com~uter which, ln a wa~ known per se, calculates tne thic'.mess o~ the sheet metal band 24 from the measured intensi.ty o the received ray, in which calculation any disturbin~ influences are corrected. It is, for example, tal~en into consideration and corrected tha.t the distrl-bution of intensity of the X-ray tube 11 over the width o~
the radiation window is not uniform. Also, the different len~ths of the path of the ray and the different an~le3 of incidence in the radiatlon recelver between ra.diation receivers which lie, for example, in the middle of the .~ :~
sheet metal band 24 and the edEe, or the different reception over the width of the radiation receiver, are corrected. :
The values of the various measurlng ra.n~es can be pa.ssed on to a dlsplay device 46, the display~panel of whlch is subdivlded into the same number of mea.surin~ ranEes.
A small strlpe on the display panel of~t:he~display devlce 46 corre~pond3 analoEously and with respect to lts positi~on to each measurln~ ran~e~31 to 39~ The~se~stripes a.re indi~
cated by d~shed lines. The values of thloknes3 of the~
sheet metal:band 24 can~be displayed diE~i:tally. However, ~ :
it is also~possible to show them by~dots~:on the display : ~ :
panel with the hei~ht of~each dot c~orresponding to the respect~ive thickness. The~dots can~also be interconnected ;
to form a~curve. And it is~`possible to attach any other kind of display deviceO ~ ~ ~
--The chopper is switched off by the counter in the transfer means 44 when it has rea.ched the number 5 in Fi~. 2.
A short pa.use follows:untll a new ra.y implnEes onto the auxiliary~detector 25.
. " ~ , ~ 2, S6t~d~ ~3 The synchronlza.tion between the slit diaphra~m 12 and the cho~per 42 becomes also possible by the fact that at the .:.
.
slit diaphr3~m 12 a reliable operatin~ counter of the number of revolutions la provlded w~ich is connected to frequency ~enerator in the chopper. The chopper can have the ~orm of a tri~Eer-impulse EeneratorO
3uitable for use as radlation recelvers are, for example, plastic scincillators which are connected at the outlet side in a known manner to photo~ultipliers and ampllflers or countin~ devices.
The slit diaphra~m can, a9 indlcated:ln~Fi~.. 3, also consist of two concentric rin~s:which are, for example, connected by ~pokes:47 and 48. It is:àlso~possible to use more than two:rinFs~
Due~to the:oonslderable measuring:resolut~ion the positl~on of the~sheet metal ed~es and~thUs the~wldth~ of the sheet:;~
metal~band~can be ea.sil,y; determlned.
The invention is:not restricted to the~described emb~odiment~
,, : - . -, :. ~ . . . ......................... . ..
. ~ . :... .. : , . . . ..
Claims (6)
1. Device for measuring the thickness profile of rolled sheet metal pieces and sheet metal bands (24) with an X-ray tube (11), with a movable slit diaphragm (12), spacedly positioned before said tube, firmly installed radiation receivers (14 to 23), along a line and directed toward the radiation, with the sheet metal piece or sheet metal band (24) to be measured being moved through the radiation between the X-ray tube (11) or the slit diaphragm (12) and the radiation receivers (14 to 23) in such a way, that its width extends along the line of the firmly installed radiation receivers (14 to 23) and that a processing device (45) is connected to the radiation receivers (14 to 23) and a transfer meanas (44) of the slit position, said processing device being intended for deter-mining the radiation absorption and allocation of the thicknesses of the sheet metal band and the measuring points and measuring ranges (31 to 39) distributed over the width of the sheet metal bands, said processing device further being connected with a display device (46), characterized in that the slit diaphragm (12) is in circular arrangement around the part of the X-ray tube (11) which emits the X-rays, is rotatably journaled and is driven by a drive means.
2. Device according to claim 1, characterized in that the slit diaphragm (12) contains more than one slit.
3. Device according to claim 1, characterized in that the distance between the slit diaphragm (12) and the radiation receivers (14 to 23) is more than 1500 mm, and the X-ray tube (11) with the slit diaphragm (12) and the radiation receivers (14 to 23) are installed in separate stands, and that for the transfer means (44) means for correcting are installed, by means of which small changes in the fixing points of the slit diaphragm (12) and the radiation receivers (14 to 23) are taken into consideration.
4. Device according to claims 1 to 3, characterized in that the transfer means (44) is installed in the stand with the radiation receivers (14 to 23) and in that at the edge of the measuring range a radiation receiver (25) is installed which, upon impingement of a ray, starts or stops a chopper (42), with said chopper (42) being interconnected between each radiation receiver (14 to 23) and the processing device (45), and in that the frequency of the chopping is adjusted in its timing to the speed of rotation of the slit diaphragm (12).
5. Device according to claims 1 to 3, characterized in that the processing device (45) comprises an error-correcting means for the measuring of the absorption, in which the non-uniform distribution of intensity of the X-ray tube (11) over the width of the radiation window, or the different length of the radiation path to the radiation receiver, or different angles of the radiation entering into the radiation receivers, or the position of the ray on the width of the radiation receiver are taken into consideration.
6, Device according to claims 1 to 3, characterized in that the slit diaphragm (12) consists of several rings, which are arranged in spaced, centric relationshop to each other and are interconnected by spokes (47) or ribs or a metal sheet with each other.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3425295A DE3425295C2 (en) | 1984-07-10 | 1984-07-10 | Device for measuring the thickness profile of rolled sheet metal strips |
| DEP3425295.9 | 1984-07-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1256219A true CA1256219A (en) | 1989-06-20 |
Family
ID=6240224
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000484329A Expired CA1256219A (en) | 1984-07-10 | 1985-06-18 | Device for measuring the thickness profile of rolled sheet metal bands |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0170778B1 (en) |
| JP (1) | JPH0629722B2 (en) |
| AT (1) | ATE35186T1 (en) |
| CA (1) | CA1256219A (en) |
| DE (2) | DE3425295C2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3530109A1 (en) * | 1985-08-23 | 1987-03-05 | Hoesch Stahl Ag | DEVICE FOR MEASURING THE THICKNESS PROFILE OF ROLLED TAPES |
| DE3825830A1 (en) * | 1988-07-29 | 1990-02-01 | Hoesch Stahl Ag | METHOD AND DEVICE FOR TEXTURE ANALYSIS |
| US5351203A (en) * | 1992-08-03 | 1994-09-27 | Bethlehem Steel Corporation | Online tomographic gauging of sheet metal |
| DE19540182A1 (en) * | 1995-10-27 | 1997-04-30 | Meselektronik Dresden Gmbh I G | Device and measuring method for determining the degree of absorption and / or scatter of a medium |
| JP4911373B2 (en) * | 2009-11-26 | 2012-04-04 | 横河電機株式会社 | X-ray measuring device |
| EP3519764B1 (en) | 2016-09-29 | 2020-07-29 | Marel Iceland EHF | A method of generating a three dimensional surface profile of a food object |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1234209A (en) * | 1959-05-12 | 1960-10-14 | Improvements in radioscopic and radiographic television installations | |
| US3866047A (en) * | 1968-08-23 | 1975-02-11 | Emi Ltd | Penetrating radiation examining apparatus having a scanning collimator |
| US3718817A (en) * | 1970-11-27 | 1973-02-27 | V Afanasiev | Device for determining the level and surface profile of materials utilizing hard radiation |
| JPS519627B2 (en) * | 1971-10-14 | 1976-03-29 | ||
| US4342914A (en) * | 1980-09-29 | 1982-08-03 | American Science And Engineering, Inc. | Flying spot scanner having arbitrarily shaped field size |
| DE3140714A1 (en) * | 1981-10-14 | 1983-04-28 | Paul Ing.(Grad.) Flormann | Device for measuring the thickness of flat sections |
| JPS5999210A (en) * | 1982-11-30 | 1984-06-07 | Toshiba Corp | Radiation thickness gauge |
-
1984
- 1984-07-10 DE DE3425295A patent/DE3425295C2/en not_active Expired
-
1985
- 1985-04-03 EP EP85104074A patent/EP0170778B1/en not_active Expired
- 1985-04-03 AT AT85104074T patent/ATE35186T1/en active
- 1985-04-03 DE DE8585104074T patent/DE3563387D1/en not_active Expired
- 1985-06-18 CA CA000484329A patent/CA1256219A/en not_active Expired
- 1985-07-10 JP JP60150348A patent/JPH0629722B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0629722B2 (en) | 1994-04-20 |
| EP0170778B1 (en) | 1988-06-15 |
| DE3563387D1 (en) | 1988-07-21 |
| JPS6135304A (en) | 1986-02-19 |
| DE3425295A1 (en) | 1986-03-20 |
| DE3425295C2 (en) | 1986-07-24 |
| EP0170778A1 (en) | 1986-02-12 |
| ATE35186T1 (en) | 1988-07-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |