CN1223827C - Multiple point thickness meter - Google Patents

Multiple point thickness meter Download PDF

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Publication number
CN1223827C
CN1223827C CNB02119825XA CN02119825A CN1223827C CN 1223827 C CN1223827 C CN 1223827C CN B02119825X A CNB02119825X A CN B02119825XA CN 02119825 A CN02119825 A CN 02119825A CN 1223827 C CN1223827 C CN 1223827C
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mentioned
determinand
ionisation chamber
thickness
multiple point
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CN1378067A (en
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贺川武
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Toshiba Corp
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Toshiba Corp
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    • 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
    • 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
    • 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
    • G01B15/06—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 the deformation in a solid
    • 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
    • G01B15/08—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 roughness or irregularity of surfaces

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  • 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)

Abstract

Provided is a thickness gauge for multi-point measurement by means of which the difference about the sensitivity for radiation of an ionization chamber becomes small in the width direction, and a more accurate measurement of board thickness can be carried out, wherein the ionization chamber 5, which is arranged in a detecting section 2, is turned around in the clockwise or counterclockwise direction in relation to the direction in which an object to be measured 4 flows. Thereby, a low sensitive region for the radiation, i.e., dead zone, which exists in conventional arrangement of the ionization chamber, can be eliminated, and the measurement of the object to be measured 4 is carried out continuously and accurately in the width direction.

Description

Multiple point thickness meter
Technical field
The present invention relates to measure in non-contacting mode the multiple point thickness meter of determinand thickness with radioactive ray.
Background technology
In recent years, along with the raising of the requirement of the calendering shape in steel and iron industry control, seek more to be applicable to the tabular analyzer of control.In the prior art, plate Width thickness measurement carries out with scan-type thickness meter etc., but because determinand in thickness measurement also major part be in moving continuously, so can not its former state obtain the shape of plate.Therefore as a rule, except using scan-type thickness meter, also introduce the thickness meter at assay plate center, obtain the plate shape according to the data correction that obtains thus.
Referring now to Figure 15 multiple point thickness meter is described.In the upside configuration detection portion 2 of " _ " shape frame 1, it is opposed to make the plate direction of the tabular determinand 4 of test section and horizontal arrangement separate slight distance up and down, at downside configuration generator 3.The output signal of test section 2 flows to thickness calculator 7.Test section 2 and generator 3 are fixed on " コ " shape frame 1.Width with determinand 2 in test section 2 disposes a plurality of ionisation chambers cylindraceous 5 abreast, these ionisation chambers detect from the radioactive ray of the fan shape of generator 3 outputs, the shape of ionisation chamber 5 is cylindric, there are big difference in heart portion and end to the sensitivity of radioactive ray therein, with Figure 16～Figure 18 this are further described below.
Figure 16 is the oblique view of the position relation of expression ionisation chamber 5 and determinand 4.Dot from the fan-shaped radiation of generator 3 outputs.The arrow view of the AA ' of the shape that Figure 17 expression is seen directly over the ionisation chamber 5.Ionisation chamber 5 disposes abreast with respect to determinand as shown in Figure 17.Because the remolding sensitivity central part of the end of ionisation chamber 5 is low, so the detecting of high spot (defective) of determinand 4 is difficult.
Illustrated among Figure 18 with ionisation chamber 5 with respect to the sensitivity profile under the determinand configured in parallel situation.As shown in figure 18, because the sensitivity of ionisation chamber 5 is low, the insensitive band that can not carry out the precision high assay periodically exists, thereby can not obtain the continuous one-tenth-value thickness 1/10 of Width.
Though also requiring to improve can be with the device of high resolving power high-precision measuring edge part, but in the multiple spot metering thickness meter of prior art, the sensitivity of the radioactive ray that can not exist between to ionisation chamber and ionisation chamber is carried out the high mensuration of precision in the low zone (hereinafter referred to as insensitive band), and it is difficult therefore obtaining continuous edge shape.
Summary of the invention
As mentioned above, in multimetering thickness meter, though the thickness of slab that locates is transformed into thickness of slab by handle in the summation equalization of the quantity of radiation of the short transverse incident of ionisation chamber, but because ionisation chamber is cylindric, so central part is the highest to the sensitivity of radioactive ray, sensitivity is along with descending near two ends.
Therefore, when measuring point just in time was insensitive band, the whole zone on the short transverse of ionisation chamber just became and is the insensitive band of what is called.Therefore sensitivity obviously descends on this position, and surveys the position of not coming out when being created in measurement of plate thickness on the Width of determinand.
In addition, when the thickness measurement that carries out apart from the optional position of the edge part of determinand, from the external device (ED) of width gauge etc. the width value of determinand is inputed to counter, by with the amount of crawling of measuring thing relatively after, utilize mobile device that multimetering thickness meter is moved and measure, but before bogie moves to the target location, can not carry out specific in the target location.
In addition, under the situation of ionisation chamber disposed adjacent,, there is the precise decreasing of edge part, the bad danger of degradation measurement result under the resolution because incide in the ionisation chamber from the radioactive ray of adjacent ionisation chamber.
The present invention considers what above problem proposed just, and its objective is provides a kind of by the difference of minimizing with the radioactive ray sensitivity that locates relevant, can compare the multiple point thickness meter that accurate Width is measured.
For this reason, the invention provides a kind of multiple point thickness meter, it is characterized in that comprising: radiation source; Cylindraceous a plurality of ionisation chambers of the output signal that output is relevant with the size of the amount of the radioactive ray of incident; Be fixed into the plate that makes as determinand and between above-mentioned radiation source and above-mentioned ionisation chamber, move, and see through the frame that determinand incides above-mentioned ionisation chamber from the radioactive ray that above-mentioned radiation source sends; With the computing unit that calculates the thickness of above-mentioned determinand according to the output signal of above-mentioned ionisation chamber, above-mentioned ionisation chamber disposes with arbitrarily angled except that parallel and right angle rotatably with respect to the moving direction of above-mentioned determinand.
In order to achieve the above object, multiple point thickness meter according to a first aspect of the present invention, have radiation source, ionisation chamber, and dispose and obtain to calculate the computing unit of above-mentioned determinand thickness with the detecting unit of the big or small output signal related of the amount of the radioactive ray that see through determinand incident from above-mentioned radiation source radiation back with according to the output signal of this detecting unit, above-mentioned ionisation chamber can get up with respect to the moving direction of above-mentioned determinand in arbitrarily angled configuration rotatably.
According to above-mentioned multiple point thickness meter of the present invention, can eliminate the part of the insensitive band that exists in the configuration of ionisation chamber in the prior art, can be continuously and carry out the thick Width of determinand accurately and measure.
Multimetering meter according to a second aspect of the present invention, the width value that the input of aforementioned calculation unit is measured by the determination unit of the width of measuring above-mentioned determinand survey, calculate the marginal position or the center of above-mentioned determinand, the thickness that can calculate according to the output signal of above-mentioned detecting unit is determined from the marginal position of above-mentioned determinand or the position of center.
Multiple point thickness meter according to a third aspect of the present invention, the input of aforementioned calculation unit is from the output signal of the unit at the edge that detects above-mentioned determinand, calculate the marginal position of above-mentioned determinand, can determine position according to the thickness that the output signal of above-mentioned detecting unit is calculated from the marginal position of above-mentioned determinand.
Multiple point thickness meter according to a fourth aspect of the present invention, the input of aforementioned calculation unit is from the centre deviation amount of external device (ED), calculate the center of above-mentioned determinand, just can determine the position of the definite center from the said determination thing of the thickness that calculates according to the output signal of above-mentioned detecting unit.
Multiple point thickness meter according to a fifth aspect of the present invention, above-mentioned ionisation chamber is configured on the position of the specialized range that comprises the target-finding position, aforementioned calculation unit input is from the determination unit of measuring above-mentioned determinand width or detect the output signal of the detecting unit or the external device (ED) of above-mentioned determinand, obtain the amount of crawling of above-mentioned determinand, simultaneously, obtain the interpolation function that is used for calculating the one-tenth-value thickness 1/10 of measuring interdigit, calculate the one-tenth-value thickness 1/10 of the position of departing from of the above-mentioned amount of crawling of leaving above-mentioned target-finding position according to above-mentioned interpolation function according to a plurality of one-tenth-value thickness 1/10s that locate.
According to fifth aspect present invention, though at determinand under the situation of target-finding position deviation, also can measure thickness continuously.
Multiple point thickness meter according to a sixth aspect of the present invention, above-mentioned ionisation chamber is the structures of radioactive ray from the side incident of cylinder, utilize the total length of above-mentioned ionisation chamber and multiply by the value of the insensitive band that safety coefficient obtains with the wall thickness of above-mentioned ionisation chamber sidewall, when determining to make above-mentioned insensitive band to disappear, with respect to the rotational angle of the above-mentioned ionisation chamber of the moving direction of above-mentioned determinand.
Multiple point thickness meter according to a seventh aspect of the present invention, above-mentioned ionisation chamber is the structures of radioactive ray from the side incident of cylinder, the value of the insensitive band that utilizes the total length of above-mentioned ionisation chamber, above-mentioned ionisation chamber internal diameter and obtain with respect to the ratio of the gas flow of above-mentioned ionisation chamber central part, when determining to make above-mentioned insensitive band to disappear, with respect to the rotational angle of the above-mentioned ionisation chamber of the moving direction of above-mentioned determinand.
Multiple point thickness meter according to a eighth aspect of the present invention, above-mentioned ionisation chamber is the structures of radioactive ray from the side incident of cylinder, utilize the value of the insensitive band that the total length of above-mentioned ionisation chamber, above-mentioned ionisation chamber external diameter and gas fill factor obtain, when determining to make above-mentioned insensitive band to disappear, with respect to the rotational angle of the above-mentioned ionisation chamber of the moving direction of above-mentioned determinand.
According to the multiple point thickness meter of a ninth aspect of the present invention,, between two adjacent ionisation chambers, insert the threshold value plate above-mentioned first in eight aspect.
According to a ninth aspect of the present invention, can not be subjected to from the influence of the scattered ray of adjacent ionisation chamber incident, thereby can not have a degradation under the resolution measurement result is had dysgenic accurate mensuration.
Description of drawings
Fig. 1 is the front view (FV) of expression according to the multiple point thickness meter formation of first embodiment of the invention.
Fig. 2 is the oblique view of the ionisation chamber configuration in expression first embodiment.
Fig. 3 be the ionisation chamber of expression from Fig. 2 directly over the view along AA ' arrow of the state seen.
Fig. 4 is the sensitivity profile of the Width of the ionisation chamber in expression first embodiment.
Fig. 5 is the figure of expression according to the multiple point thickness meter formation of second embodiment of the invention.
Fig. 6 is the figure of expression according to the multiple point thickness meter formation of third embodiment of the invention.
Fig. 7 is the figure of expression according to the multiple point thickness meter formation of four embodiment of the invention.
Fig. 8 is the figure of expression according to the multiple point thickness meter formation of fifth embodiment of the invention.
Fig. 9 is illustrated in the 5th embodiment, the figure of the curve that target-finding is obtained by the plate thickness value of interpolation target-finding position under each other the situation of locating of reality.
Figure 10 is illustrated in the 5th embodiment, the curve map that determinand crawls and obtains by the plate value of interpolation target-finding position under the situation.
Figure 11 is the figure of method that is used for illustrating the anglec of rotation of the ionisation chamber of determining sixth embodiment of the invention.
Figure 12 is used for illustrating the ionisation chamber internal diameter that utilizes sixth embodiment of the invention, and relatively the gas flow of ionisation chamber central part is than the figure of the method for the anglec of rotation that waits to determine ionisation chamber.
Figure 13 is used for illustrating the ionisation chamber external diameter that utilizes the 6th embodiment of the present invention, and the gas fill factor waits to determine the figure of method of the anglec of rotation of ionisation chamber.
Figure 14 is the figure of expression according to the major part formation of the multiple point thickness meter of the 7th embodiment of the present invention.
Figure 15 is the front view of the formation of expression prior art example.
Figure 16 is the oblique view of the configuration of the ionisation chamber in the expression prior art example.
Figure 17 is illustrated among Figure 16 the view along AA ' arrow of the state of seeing directly over the ionisation chamber.
Figure 18 is the figure of expression with regard to the sensitivity profile of the Width of the ionisation chamber in the prior art example.
Embodiment
Embodiments of the present invention are described with reference to the accompanying drawings.In following figure, comprise expression figure of the prior art, identical bis is represented with a part or corresponding part.
(first embodiment)
Below with reference to Fig. 1～Fig. 4 first embodiment of the present invention is described.
In Fig. 1, in order to measure the thickness of slab of tabular determinand 4, by the Width move operation on multiple point thickness meter mobile device 6 edge " コ " shape framves.On " コ " shape frame 1, at the fixing generator 3 of downside, in upside fixed test portion 2.Configuration ionisation chamber 5 in test section 2.
Incide ionisation chamber from the radioactive ray of generator 3 outputs through determinand.The radioactive ray of incident make the gas generation photoelectric absorption of enclosing in the ionisation chamber 5, and the generation Compton scattering, make gas ionization by effects such as electron pair generations, at this moment the electric charge of Fa Shenging is drawn towards electrode by being added in interelectrode electric field, and recombination reverts to neutral atom on electrode.At this moment the electric current that flows out after the A/D conversion, flows to thickness calculator 7 as the output signal of test section 2, is transformed into the one-tenth-value thickness 1/10 of determinand 4.
In the prior art example, as mentioned above, owing to make ionisation chamber 5 with respect to the determinand configured in parallel, and periodically have insensitive band, therefore can not obtain the continuous one-tenth-value thickness 1/10 of Width.Therefore, change the configuration of ionisation chamber 5 in the present embodiment so that sensitive band elimination.
Fig. 2 is the ionisation chamber 5 of expression in the present embodiment and the oblique view of the position relation of determinand 4.Dot the radioactive ray from generator 3 output fan-shaped.The view along the direction of arrow of the state that Fig. 3 expression is seen directly over the ionisation chamber 5.Ionisation chamber is constituted as shown in Figure 3 the structure that disposes sideling with respect to determinand 4.Like this, can be configured to by making ionisation chamber 5, on the plane of directly over determinand 4, seeing, with respect to the moving direction of determinand 4 in the clockwise direction or counter-clockwise direction rotate at any angle under the state, the part of the insensitive band that exists in the configuration of the ionisation chamber of prior art is disappeared, thus can be continuously and accurately carry out the mensuration of determinand 4 Widths.
In Fig. 4, show and make ionisation chamber 5 along clockwise direction or the sensitivity profile of counterclockwise embodiment with respect to the moving direction of determinand 4.As from seeing the figure, the sensitivity more than the plate Width of determinand 4 can obtain necessarily.Therefore having on the part of determinand 4 under the situation of high spot (defective), also can easily detect this defective.
(second embodiment)
Fig. 5 is the figure of the formation of expression second embodiment of the present invention.In this embodiment, thickness calculator 7 with the situation of first embodiment similarly, when calculating the one-tenth-value thickness 1/10 of determinand 4 according to the output signal of test section 2, input is by the wide value of plate of width gauge 8 mensuration and the panel edges position or the plate center of calculating determinand 4.
Therefore, the thickness that counter 7 can calculate according to the output signal of test section 2 is determined the panel edges position of determinand 4 or from the position at plate center.
(the 3rd embodiment)
Fig. 6 is the figure of the formation of expression third embodiment of the invention.In this embodiment, thickness calculator with the situation of first embodiment in the same manner, when calculating the one-tenth-value thickness 1/10 of determinand 4 according to the output signal of test section 2, the signal that input is detected by edge detector 9, the panel edges position of calculating determinand.
Therefore, the thickness that counter 7 can calculate according to the output signal of test section 2, definite position from the determinand panel edges.
(the 4th embodiment)
Fig. 7 is the figure that expression the 4th embodiment of the present invention constitutes.In the present embodiment, thickness calculator 7 with the situation of first embodiment similarly, when calculating determinand 4 thickness, calculate the plate center from the external device (ED) 10 tablet center offsets of host computer etc. according to the output signal of test section 2.
Therefore, the thickness that counter 7 can calculate according to the output signal of test section 2, the position of definite plate center from determinand 4.
(the 5th embodiment)
Fig. 8～Figure 10 be the explanation this implement the figure of the 5th embodiment.
Fig. 8 is the multiple point thickness meter of expression for first embodiment is constituted like that, the formation when being used to measure the thickness of slab of target location of the edge part any distance of leaving determinand 4.In order multiple point thickness meter to be measured leave the target location of the edge any distance of determinand 4, being configured in ionisation chamber 5 with this position is on the position of specialized range at center, to measure thickness of slab.
Thickness calculator 7 is according to the output signal of test section 2, obtain the thickness of slab value 11,12,13 near a plurality of the locating of the specialized range the target-finding position, and when obtaining marginal position from the axis signal of width gauge 8 or edge detector 9, as shown in Figure 9, make thickness of slab value 11,12,13 with map to the corresponding position of distance that locates from each marginal position, by these measurements of plate thickness result is coupled together with interpolation function 14, can curveization.Even the target-finding position is in the situation each other of practical measurement position, also can obtain the thickness of slab value 16 of the target-finding position of isolated edge position any distance 15 by interpolation function 14.
In addition, major part is a determinand 4 when being passed plate and occur, the edge Width situation that the limit occurs of crawling.Expression is inputed to thickness calculator 7 from output signals wide or marginal position or center offset (amount of crawling) etc. such as the plate of width measuring instrument 8 or edge detector 9 or external device (ED) 10 etc., calculate the amount of crawling of determinand 4.Near locating with the interpolation function linking objective then measurement of plate thickness result, such as shown in the figure curveization.That is to say, be connected the thickness of slab value 17 of target-finding position and the thickness of slab value 18,19 of position nearby with interpolation function 20.Calculate side-play amount promptly under the situation of the amount of crawling 21 at the marginal position that utilizes width gauge 8 grades to obtain, obtain thickness of slab value 22 according to interpolation function 20.By this value as the thickness of slab value of target-finding position, even also can measure thickness of slab continuously during the determinand offset target.
(the 6th embodiment)
Figure 11～Figure 13 is the figure of explanation sixth embodiment of the invention.Sensitivity and the gas flow in the ionisation chamber 5 to the radioactive ray of ionisation chamber 5 are proportional.Low in ionisation chamber 5 ends because of the few sensitivity of gas flow, disappear in the sensitivity of the sidewall sections of ionisation chamber 5 to radioactive ray.
In the present embodiment, be the structure of ionisation chamber 5 from the side incident radioactive ray of cylinder, as shown in figure 11, with respect to the definite rotational angle α that can make the ionisation chamber 5 of this insensitive band disappearance of the moving direction of determinand.
At first, as first method of determining rotational angle α, can obtain with the value of the total length of ionisation chamber and the insensitive band of obtaining by the wall thickness of ionisation chamber sidewall and safety coefficient are multiplied each other.Also just say, in the total length of establishing ionisation chamber 5 is 2L, the wall thickness t of ionisation chamber sidewall and safety coefficient multiply each other under the insensitive situation of obtaining with 11 value (=t γ), when insensitive band is become vanishing state, with respect to the rotational angle α of the ionisation chamber 5 of the moving direction of determinand 4, as α=tan -1(T/L) obtain.Safety coefficient is constant arbitrarily (for example 2).
Then, as second method of determining rotational angle α, can be with the total length of ionisation chamber, the internal diameter of ionisation chamber with by obtaining than the value of the insensitive band of obtaining with the gas flow of relative ionisation chamber central part.As shown in figure 12, establish with respect to the gas flow of the central part O of ionisation chamber 5 than being to become and insensitive position with 11 border for the position of c, establishing by this position on the horizontal line of central part O is B.That is to say that when establishing the ionisation chamber internal diameter and be 2r, the distance of establishing the inner wall position C from position B to its top is l 1, then position B becomes l 1The position of=cr.In addition in the drawings, the position of establishing the upper inner wall of central part O is A, and O is " t " to the distance of position B from central division, and the distance of the position D of the inwall from position B to its horizontal direction is t ', and then the angle of OA and OC folder is β.
At this l 1=cr, as we know from the figure, because of l 1So=rcos β is c=cos β.Therefore, if provide, then can obtain angle beta with respect to the gas flow of ionisation chamber central part number than c."=rsin β is so insensitive value T with 11 can obtain as follows in addition, as we know from the figure, because t.
[formula 1]
T＝t+t′
＝t+(r-t″)
＝t+r(1-sinβ)
So, insensitive according to what obtain like this with 11 the value T and the total length 2L of ionisation chamber, in the time of can disappearing insensitive band, with respect to the rotational angle α of the ionisation chamber 5 of the moving direction of determinand 4 as α=tan -1(T/L) obtain.In addition, can be constant (for example 0.5) arbitrarily with respect to the gas flow of ionisation chamber central part than c.
In addition, as the third method, can be by the total length of utilizing ionisation chamber, the value of the insensitive band that ionisation chamber external diameter and gas fill factor (the effective diameter coefficient that gas is full of) are obtained is obtained.When if the ionisation chamber external diameter is 2R, as shown in figure 13, on the horizontal line of central part O by ionisation chamber 5, the distance of leaving central part O, be the ionisation chamber external diameter half value R and the position E of the value of gas fill factor c ' after multiplying each other as insensitive with 11 border, obtain insensitive with 11 value T according to following method.
[formula 2]
T＝R-c′R
＝R(1-c′)
Then can be insensitive with 11 the value T and the total length 2L of ionisation chamber 5 according to what obtain like this, when insensitive band disappears, with respect to the rotational angle α of the ionisation chamber 5 of the moving direction of determinand as α=tan -1(T/L) obtain.In addition, gas fill factor c ' can be arbitrary constant (for example about 0.7～0.8 value).
(the 7th embodiment)
Figure 14 is the figure of explanation seventh embodiment of the invention.As described in first to the 6th embodiment, when making a plurality of ionisation chamber 5 disposed adjacent, because on the ionisation chamber 5 except from the radioactive ray of generator 3 radiation, also incident is from the scattered ray 13 of adjacent ionisation chamber 5, so that the precise decreasing of edge part, degradation produces harmful effect to measurement result under the resolution.
In this embodiment, between adjacent ionisation chamber 5, dispose threshold value plate 12 for the influence that reduces such scattered ray 13.
Is the thickness setting of threshold value plate 12 the abundant thickness of ABSORPTION AND SCATTERING line, the length of threshold value plate 12 and highly respectively in the length of ionisation chamber 5, more than the height.
The material of threshold value plate 12 can be used stainless steel (for example SUS304), but so long as the material of energy ABSORPTION AND SCATTERING line just, does not have other restriction, for example can use tungsten, lead etc.
In addition, the material that linear absorption coefficient is big more, thickness of slab can be done thinly more.
In addition, as mentioned above, under the situation with threshold value plate 12, when insensitive band disappeared, with respect to the rotational angle α ' of the ionisation chamber 5 of the moving direction of determinand 4, the thickness of slab of establishing threshold value plate 12 was t 2The time, can use (T+0.5t 2) replace the T in the 6th embodiment, as α '=tan -1{ (T+0.5t 2)/L} obtains.
As mentioned above, according to the present invention, by make ionisation chamber be configured to respect to the moving direction of determinand along clockwise direction or counter-clockwise direction rotate, reduce the low area decreases of radioactive ray sensitivity, thereby can obtain the little multiple point thickness meter of change of sensitivity on whole mensuration zone, also can easily detect when on the determinand part, having high spot (defective).
In addition, obtain the amount of crawling according to input signal, make it be applicable to the function of interpolation between respectively locating then, can be corresponding with the skew of the target-finding position that causes by crawling of determinand, thus can carry out near the target-finding position mensuration continuously.

Claims (5)

1, a kind of multiple point thickness meter is characterized in that comprising:
Radiation source;
Cylindraceous a plurality of ionisation chambers of the output signal that output is relevant with the size of the amount of the radioactive ray of incident;
Be fixed into the plate that makes as determinand and between above-mentioned radiation source and above-mentioned ionisation chamber, move, and see through the frame that determinand incides above-mentioned ionisation chamber from the radioactive ray that above-mentioned radiation source sends; With
Calculate the computing unit of the thickness of above-mentioned determinand according to the output signal of above-mentioned ionisation chamber,
Above-mentioned ionisation chamber disposes with arbitrarily angled except that parallel and right angle rotatably with respect to the moving direction of above-mentioned determinand.
2, multiple point thickness meter as claimed in claim 1, it is characterized in that: also be provided with the width measurements unit of measuring the width of above-mentioned determinand from the output signal of above-mentioned ionisation chamber, the aforementioned calculation unit is transfused to the width value of being measured by above-mentioned width measurements unit, calculate the marginal position or the center of above-mentioned determinand, can in the thickness that calculates according to the output signal of above-mentioned ionisation chamber, determine from the marginal position of above-mentioned determinand or the distance of center.
3, multiple point thickness meter as claimed in claim 1, it is characterized in that: the aforementioned calculation unit is transfused to the output signal from the edge detection unit at the edge that detects above-mentioned determinand, calculate the marginal position of above-mentioned determinand, can in the thickness that calculates according to the output signal of above-mentioned ionisation chamber, determine distance from the marginal position of above-mentioned determinand.
4, multiple point thickness meter as claimed in claim 1, it is characterized in that: above-mentioned ionisation chamber is the structures of radioactive ray from the side incident of cylinder, utilize the total length of above-mentioned ionisation chamber and the wall thickness of above-mentioned ionisation chamber sidewall be multiply by the value of the insensitive band that safety coefficient obtains, when determining to make above-mentioned insensitive band to disappear, with respect to the rotational angle of the above-mentioned ionisation chamber of the moving direction of above-mentioned determinand.
5, as each the described multiple point thickness meter in the claim 1 to 4, it is characterized in that: between two adjacent above-mentioned ionisation chambers, insert the threshold value plate.
CNB02119825XA 2001-03-01 2002-02-28 Multiple point thickness meter Expired - Lifetime CN1223827C (en)

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JP056817/2001 2001-03-01
JP2001056817 2001-03-01
JP013937/2002 2002-01-23
JP2002013937A JP3948965B2 (en) 2001-03-01 2002-01-23 Multi-point thickness gauge

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CN1223827C true CN1223827C (en) 2005-10-19

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CN1378067A (en) 2002-11-06
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KR20020070824A (en) 2002-09-11
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