CN103968749A - Object thickness detection device and detection method thereof - Google Patents
Object thickness detection device and detection method thereof Download PDFInfo
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- CN103968749A CN103968749A CN201410210186.3A CN201410210186A CN103968749A CN 103968749 A CN103968749 A CN 103968749A CN 201410210186 A CN201410210186 A CN 201410210186A CN 103968749 A CN103968749 A CN 103968749A
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Abstract
The invention discloses an object thickness detection device and a detection method of the object detection device. The object thickness detection device comprises a first electrode plate, a second electrode plate and a detection mechanism, wherein the second electrode plate is separated from the first electrode plate by a preset distance, the first electrode plate and the second electrode plate form a capacitor, and the detection mechanism is connected with the first electrode plate and the second electrode plate and used for detecting the voltage between the first electrode plate and the second electrode plate and then determining the thickness range of an object to be detected which passes between the first electrode plate and the second electrode plate according to the voltage. Through the object thickness detection device and the detection method of the object detection device, the effect of improving the accuracy of detecting the thickness of the object is achieved.
Description
Technical field
The present invention relates to detection field, in particular to a kind of object thickness pick-up unit and detection method thereof.
Background technology
Laminar article, as the on-line continuous thickness measure of the objects such as paper, bill, plastic sheeting, textile fabric, in the processes such as the production of its product, detection, processing, recovery in consequence more and more.The technology such as current, that the object thickness detection technique that every profession and trade is used mainly comprises is ultrasonic, induction with hall device, reflection-type ultrasound wave, transmission-type, eddy current type are carried out the thickness of test sheets formula article.But when these technology are used as online measuring technique, its pick-up unit volume is large, and cost height is its major defect, has limited the application of these technology.
At present, object thickness measurement scheme is mainly the variation that the volume change of capacitor is changed into oscillation frequency, then the variation of pressing modular converter to convert the variation of frequency to voltage by frequency detects thickness.Or the Sensitive Apparatus that utilizes the pole plate of capacity plate antenna to detect as thickness, the electric capacity movable polar plate that the variation in thickness of actual measurement object causes produces displacement, cause the capacity of plate condenser to change, thereby change the output frequency of the oscillator being formed by plate condenser, carried out thickness detection by detecting frequency.Above-mentioned two schemes all produces the variation of frequency and carries out the detection of thickness through be made up of oscillating circuit electric capacity, the thickness that carries out of the multiple conversion of this process detects the precision reduction that causes object thickness to detect.
The low problem of precision detecting for object thickness in prior art, not yet proposes effective solution at present.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of object thickness pick-up unit and detection method thereof, the low problem of precision detecting to solve object thickness.
To achieve these goals, according to an aspect of the present invention, provide a kind of object thickness pick-up unit.Object thickness pick-up unit according to the present invention comprises: the first battery lead plate; The second battery lead plate, arranges with described the first battery lead plate interval predeterminable range, and wherein, described the first battery lead plate and described the second battery lead plate form electric capacity; And testing agency, be connected respectively with described the second battery lead plate with described the first battery lead plate, for detection of the voltage between described the first battery lead plate and described the second battery lead plate, and determine the thickness range from the object under test that passes through between the first battery lead plate and the second battery lead plate according to described voltage.
Further, described testing agency comprises: impedance transformation unit, be connected respectively with described the second battery lead plate with described the first battery lead plate, and for by impedance transformation, described voltage being amplified to processing, the voltage after being amplified; And comparing unit, be connected with described impedance transformation unit, for by the voltage after described amplification and threshold voltage compares and determine the thickness range of described object under test according to comparative result.
Further, described impedance transformation unit comprises field effect transistor amplification circuit or transistor amplifier.
Further, described the second battery lead plate comprises the 21 battery lead plate and the two or two battery lead plate, wherein, described the 21 battery lead plate and described the two or two battery lead plate in the same side of described the first battery lead plate and all with predeterminable range setting described in described the first battery lead plate interval, wherein, described testing agency is connected respectively with described the two or two battery lead plate with described the 21 battery lead plate, for detection of the first voltage and second voltage, described the first voltage is the voltage between described the 21 battery lead plate and described the first battery lead plate, described second voltage is the voltage between described the two or two battery lead plate and described the first battery lead plate.
Further, described testing agency comprises: the first impedance transformation unit, be connected respectively with described the first battery lead plate with described the 21 battery lead plate, and for by impedance transformation, described the first voltage being amplified, the first voltage after being amplified; The second impedance transformation unit, is connected respectively with described the first battery lead plate with described the two or two battery lead plate, for by impedance transformation, described second voltage being amplified, and the second voltage after being amplified; Differential amplification unit, is connected respectively with described the second impedance transformation unit with described the first impedance transformation unit, amplifies for the voltage difference of the second voltage after the first voltage and described amplification to after described amplification, obtains differential voltage; And comparing unit, be connected with described differential amplification unit, for by described differential voltage and threshold voltage compares and determine the thickness range of described object under test according to comparative result.
Further, described the first battery lead plate is connected with power supply, and wherein, described power supply is for powering to described the first battery lead plate; Or described the first battery lead plate is electret battery lead plate.
Further, described object thickness pick-up unit also comprises: electric weight compensating unit, and for the carried charge of described electret battery lead plate is compensated.
Further, described object thickness pick-up unit also comprises: correcting unit, is connected with described testing agency, for described testing agency is proofreaied and correct.
To achieve these goals, according to a further aspect in the invention, provide a kind of detection method for object thickness pick-up unit.Wherein, described object thickness pick-up unit comprises the first battery lead plate; The second battery lead plate, arranges with described the first battery lead plate interval predeterminable range, and wherein, described the first battery lead plate and described the second battery lead plate form electric capacity, and object under test passes through between described the first battery lead plate and described the second battery lead plate; And testing agency, be connected respectively with described the second battery lead plate with described the first battery lead plate,
Wherein, described detection method comprises: detect the voltage between described the first battery lead plate and described the second battery lead plate; And determine the thickness range of described object under test according to described voltage.
Further, described the second battery lead plate comprises the 21 battery lead plate and the two or two battery lead plate, described voltage comprises the first voltage and second voltage, described the first voltage is the voltage between described the first battery lead plate and described the 21 battery lead plate, described second voltage is the voltage between described the first battery lead plate and described the two or two battery lead plate, wherein, determine that according to described voltage the thickness range of described object under test comprises:
Calculate the voltage difference of described the first voltage and described second voltage; Described voltage difference is amplified, obtain differential voltage; Described differential voltage and threshold voltage are compared, obtain comparative result; And determine the thickness range of described object under test according to comparative result.
By the present invention, adopt the first battery lead plate and the second battery lead plate to form electric capacity, when object under test passes through between the first battery lead plate and the second battery lead plate, the voltage between the first battery lead plate and the second battery lead plate detects in testing agency, to determine the thickness of object under test, without the data that detect are carried out to multiple conversion, reduce the error in conversion process, thereby solve the low problem of precision that object thickness detects, reached the effect of the precision that improves object thickness detection.
Brief description of the drawings
The accompanying drawing that forms the application's a part is used to provide a further understanding of the present invention, and schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is according to the schematic diagram of the object thickness pick-up unit of first embodiment of the invention;
Fig. 2 is according to the schematic diagram of the object thickness pick-up unit of second embodiment of the invention;
Fig. 3 is according to the schematic diagram of the object thickness pick-up unit of third embodiment of the invention;
Fig. 4 is according to the schematic diagram of the object thickness pick-up unit of fourth embodiment of the invention;
Fig. 5 is according to the schematic diagram of the object thickness pick-up unit of fifth embodiment of the invention; And
Fig. 6 is according to the process flow diagram of the detection method for object thickness pick-up unit of the embodiment of the present invention.
Embodiment
It should be noted that, in the situation that not conflicting, the feature in embodiment and embodiment in the application can combine mutually.Describe below with reference to the accompanying drawings and in conjunction with the embodiments the present invention in detail.
In order to make those skilled in the art person understand better the present invention program, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the embodiment of a part of the present invention, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtaining under creative work prerequisite, should belong to the scope of protection of the invention.
It should be noted that, term " first ", " second " etc. in instructions of the present invention and claims and above-mentioned accompanying drawing are for distinguishing similar object, and needn't be used for describing specific order or precedence.Should be appreciated that the data of such use are suitably exchanging in situation, so that embodiments of the invention described herein.In addition, term " comprises " and " having " and their any distortion, intention is to cover not exclusive comprising, for example, those steps or unit that process, method, system, product or the equipment that has comprised series of steps or unit is not necessarily limited to clearly list, but can comprise clearly do not list or for these processes, method, product or equipment intrinsic other step or unit.
The embodiment of the present invention also provides a kind of object thickness pick-up unit.Fig. 1 is according to the schematic diagram of the object thickness pick-up unit of the embodiment of the present invention.As shown in Figure 1, this object thickness pick-up unit comprises the first battery lead plate 10, the second battery lead plate 20 and testing agency 30.The second battery lead plate 20 and the first battery lead plate 10 interval predeterminable ranges arrange, and wherein, the first battery lead plate 10 and the second battery lead plate 20 form electric capacity, and object under test passes through between the first battery lead plate 10 and the second battery lead plate 20.Testing agency is connected respectively with the second battery lead plate 20 with the first battery lead plate 10, for detection of the voltage between the first battery lead plate 10 and the second battery lead plate 20, and determine the thickness range from the object under test that passes through between the first battery lead plate and the second battery lead plate according to voltage.
The first battery lead plate 10 and the second battery lead plate 20 can be just to the formation parallel plate capacitors that be arranged in parallel, and the predeterminable range at its interval can be adjusted according to the thickness of object under test.In the first battery lead plate 10 and the second battery lead plate 20, can select a battery lead plate as the battery lead plate with fixed potential, for example, the first battery lead plate be connected to power supply, this power supply has fixing magnitude of voltage.The voltage between the first battery lead plate 10 and the second battery lead plate 20 detects in testing agency 30, determines the thickness of object under test according to this voltage.
The first battery lead plate 10 of the embodiment of the present invention can comprise one or more battery lead plate, and the second battery lead plate 20 also can comprise one or more battery lead plate.For example, the second battery lead plate comprises two battery lead plates, these two battery lead plates respectively with predeterminable range setting described in the first battery lead plate 10 intervals, two battery lead plates can be in same plane.These two battery lead plates form electric capacity with the first battery lead plate 10 respectively.
In the time measuring object under test thickness, object under test can be with direction shown in arrow in scheming by between the first battery lead plate 10 and the second battery lead plate 20, because the first battery lead plate 10 and the second battery lead plate 20 form electric capacity, in the time that object under test passes through between the first battery lead plate 10 and the second battery lead plate 20, voltage between the first battery lead plate 10 and the second battery lead plate 20 is changed, testing agency 30, voltage between the first battery lead plate 10 and the second battery lead plate 20, thus the thickness of determining object under test according to this voltage is without multiple conversions.
In the embodiment of the present invention, object under test can be laminar article, such as paper, bill, plastic sheeting, textile fabric etc.
According to the embodiment of the present invention, adopt the first battery lead plate and the second battery lead plate to form electric capacity, when object under test passes through between the first battery lead plate and the second battery lead plate, the voltage between the first battery lead plate and the second battery lead plate detects in testing agency, to determine the thickness of object under test, without the data that detect are carried out to multiple conversion, reduce the error in conversion process, thereby solve the low problem of precision that object thickness detects, reached the effect of the precision that improves object thickness detection.
As shown in Figure 2, testing agency 30 comprises impedance transformation unit 301 and comparing unit 302, impedance transformation unit 301 is connected respectively with the second battery lead plate 20 with the first battery lead plate 10, for by impedance transformation, voltage being amplified to processing, and the voltage after being amplified.Comparing unit 302 is connected with impedance transformation unit 301, for by the voltage after amplifying and threshold voltage compares and determine the thickness range of object under test according to comparative result.
Comparing unit 302 can comprise comparer, so that voltage and threshold voltage after amplifying are compared, determines the thickness range of object under test.Threshold voltage can be the voltage of the thickness range for determining object under test.
Particularly, between the first battery lead plate 10 and the second battery lead plate 20, have small voltage u1, after amplifying, impedance transformation unit 301 becomes U1, in the time having thin slice object to pass through between the first battery lead plate 10 and the second battery lead plate 20, voltage between the first battery lead plate 10 and the second battery lead plate 20 can change, become u2, after impedance transformation unit 301 amplifies, become U2, U2 access comparing unit 302 participates in relatively (comparing with threshold voltage); In the process of passing through at thin slice object, if slice substance body thickness is consistent, the voltage that impedance transformation unit 301 is exported is always U2, consider that thin slice object is by the vibrations in process, U2 changes U2 ± △ U interval (being threshold voltage), when thin slice object is passing through in process, the value that judges U2 by comparing unit 302, whether in this interval of U2 ± △ U, if exceed this interval, can think that slice substance body thickness is abnormal.
Preferably, impedance transformation unit comprises field effect transistor amplification circuit or transistor amplifier.By field effect transistor amplification circuit or transistor amplifier, the voltage detecting is amplified to processing.
Preferably, the second battery lead plate 20 comprises the 21 battery lead plate and the two or two battery lead plate, and wherein, the 21 battery lead plate and the two or two battery lead plate arrange with the first battery lead plate 20 interval predeterminable ranges in the same side of the first battery lead plate 10 and all, to form two electric capacity.Wherein, testing agency 30 is connected respectively with the two or two battery lead plate with the 21 battery lead plate, for detection of the first voltage and second voltage, the first voltage is the voltage between the 21 battery lead plate and the first battery lead plate 10, and second voltage is the voltage between the two or two battery lead plate and the first battery lead plate 10.
Because the device in the present embodiment comprises two electric capacity, two electric capacity are to there being two voltages, i.e. the first voltage and second voltage, and detection architecture 30 detects the first voltage and second voltage, can calculate the voltage difference of the first voltage and second voltage, and determine the thickness of object under test according to voltage difference.
Further preferably, testing agency 30 comprises: the first impedance transformation unit, be connected respectively with the first battery lead plate with the 21 battery lead plate, and for by impedance transformation, the first voltage being amplified, the first voltage after being amplified; The second impedance transformation unit, is connected respectively with the first battery lead plate with the two or two battery lead plate, for second voltage being amplified by impedance transformation, and the second voltage after being amplified; Differential amplification unit, is connected respectively with the second impedance transformation unit with the first impedance transformation unit, and the voltage difference of the second voltage for the first voltage to after amplifying and after amplifying is amplified, and obtains differential voltage; And comparing unit, be connected with differential amplification unit, for by differential voltage and threshold voltage compares and determine the thickness range of object under test according to comparative result.
Particularly, as shown in Figure 3, the 21 battery lead plate the 201 and the 22 battery lead plate 202 symmetries be placed on the first battery lead plate 10 opposites, form two parallel plate capacitors, the first impedance transformation unit 3011 and the second impedance transformation unit 3012 access differential amplifying units 303, by differential amplification unit 303, two paths of signals is carried out to differential amplification, the output access comparing unit 302 after amplification.Differential amplification unit 303 can amplify the differential signal (i.e. the voltage difference of the first voltage and second voltage) between the first battery lead plate the 10 and the 21 battery lead plate the 201 and the 22 battery lead plate 202, and can effectively suppress for the common-mode signal that affects two pole plates simultaneously; Thin slice object is simultaneously through two plate electrode lower times, when slice substance body thickness even, two to detect voltage on electrode identical, voltage after desirable differential amplification is 0, consider under two electrodes the inconsistent factors such as thin slice object vibrations, can be set to ± △ of the threshold voltage of comparing unit 302 U, at thin slice object simultaneously by the process of two pole plates, if exceed ± △ of the voltage after differential amplification is U, can think that slice substance body thickness is abnormal.It should be noted that, when object under test enter the 21 battery lead plate 201 times and entering of not entering that the two or two battery lead plate 202 times produces voltage difference signal or thin slice object are walked out the 21 battery lead plate 201 and walk out voltage difference signal only as judge that thin slice object enters circuit and walks out the mark of circuit while not walking out two or two battery lead plate 202, and conduct does not judge the foundation that slice substance body thickness is abnormal; Especially, enter voltage difference signal relevant with thin slice object translational speed with the size of walking out voltage difference signal, the speed that should enter circuit according to thin slice object accurately judges two voltage signals.
The difference of the object thickness pick-up unit shown in object thickness pick-up unit and Fig. 3 embodiment illustrated in fig. 4 is to increase storage unit 304, is connected, for storing the threshold value that compares to determine under multiple condition with comparing unit 302.Under different temperature, damp condition, two to detect the output of difference in thickness identical under electrode after differential amplification also different, so the setting of threshold voltage can not adapt to the impact of changeable environmental factor in comparing unit 302.Test by reality, by the threshold voltage list storage under different temperatures, damp condition in storage unit 304.In the time of circuit working, by judging the temperature and humidity of environment, the list from storage unit 304 selects suitable compare threshold accurately to judge.
Preferably, the first battery lead plate 10 is connected with power supply, and wherein, power supply is for powering to the first battery lead plate; Or the first battery lead plate 10 is electret battery lead plate.The first battery lead plate 10 is connected with power supply, represents that the first battery lead plate 10 has fixed voltage value, and like this, the change in voltage that only need to measure the second battery lead plate 20 can obtain the change in voltage between the first battery lead plate 10 and the second battery lead plate 20.In the time that the first battery lead plate is electret battery lead plate, the quantity of electric charge that the first battery lead plate 10 has is fixed, and that is to say that the electromotive force having fixes.
Further preferably, object thickness pick-up unit also comprises electric weight compensating unit, and electric weight compensating unit is for compensating the carried charge of electret battery lead plate.In the time that the first battery lead plate 10 is electret battery lead plate, along with the change of passage of time or environmental factor, its quantity of electric charge can change (reduce or increase), by adopting electric weight compensating unit to compensate the quantity of electric charge of electret battery lead plate, thereby avoid change due to the quantity of electric charge of the electret battery lead plate impact on testing result.Electric weight compensating unit can and electret battery lead plate between be connected, for directly the electric weight of electret battery lead plate being compensated; Electric weight compensating unit can also be connected with differential amplification unit, for supplementing the voltage variety causing due to the electric quantity change of electret battery lead plate.
As shown in Figure 5, in the embodiment of the present invention, electric weight compensating unit 305 is connected with differential amplification unit 303, in the time that the first battery lead plate uses electret battery lead plate, can increase electric weight compensating unit 305, for compensating the variation of electret electric weight.In the long-time use procedure of circuit, the electric weight of electret may increase or reduce because of environmental factor, thereby affects final judgement precision.A kind of feasible method is to adopt root thickness specimen page to be placed under one of them electrode, draw the output of differential amplification unit 303, electric weight compensating unit is compared itself and primary standard output, if variant, adjusted the gain of differential amplification unit by compensating unit, equate with primary standard value until differential amplification is exported, can eliminate like this erroneous judgement being caused by electret carried charge difference.
Certainly,, in the time that the first battery lead plate adopts electret battery lead plate, in storage unit 304, can store the threshold voltage under different electret battery lead plate electric weight.In the time of the variation of electret carried charge, can select different threshold voltages to compensate the error that this electric quantity change of electret is brought, thereby reduce because the quantity of electric charge changes the impact on testing result.
Preferably, object thickness pick-up unit also comprises correcting unit, is connected, for testing agency is proofreaied and correct with testing agency 30.Proofread and correct the precision of the components and parts such as comparing unit, thereby avoid the impact on testing result of precision due to components and parts.
The embodiment of the present invention a kind of detection method for object thickness pick-up unit is also provided, the method can be for the object thickness pick-up unit of the embodiment of the present invention, and the object thickness pick-up unit of the embodiment of the present invention also can adopt the detection method of the embodiment of the present invention.Object thickness pick-up unit comprises: the first battery lead plate; The second battery lead plate, arranges with the first battery lead plate interval predeterminable range, and wherein, the first battery lead plate and the second battery lead plate form electric capacity, and object under test passes through between the first battery lead plate and the second battery lead plate; And testing agency, be connected respectively with the second battery lead plate with the first battery lead plate.Detection method comprises the following steps:
Step S602, detects the voltage between the first battery lead plate and the second battery lead plate.
Step S604, determines the thickness range of object under test according to voltage.
In the time measuring object under test thickness, object under test can be with direction shown in arrow in Fig. 1 by between the first battery lead plate 10 and the second battery lead plate 20, because the first battery lead plate 10 and the second battery lead plate 20 form electric capacity, in the time that object under test passes through between the first battery lead plate 10 and the second battery lead plate 20, voltage between the first battery lead plate 10 and the second battery lead plate 20 is changed, testing agency 30, voltage between the first battery lead plate 10 and the second battery lead plate 20, thus the thickness of determining object under test according to this voltage is without multiple conversions.
Particularly, between the first battery lead plate 10 and the second battery lead plate 20, have small voltage u1, after amplifying, impedance transformation unit 301 becomes U1, in the time having thin slice object to pass through between the first battery lead plate 10 and the second battery lead plate 20, voltage between the first battery lead plate 10 and the second battery lead plate 20 can change, become u2, after impedance transformation unit 301 amplifies, become U2, U2 access comparing unit 302 participates in relatively (comparing with threshold voltage); In the process of passing through at thin slice object, if slice substance body thickness is consistent, the voltage that impedance transformation unit 301 is exported is always U2, consider that thin slice object is by the vibrations in process, U2 changes U2 ± △ U interval (being threshold voltage), when thin slice object is passing through in process, the value that judges U2 by comparing unit 302, whether in this interval of U2 ± △ U, if exceed this interval, can think that slice substance body thickness is abnormal.
In the embodiment of the present invention, object under test can be laminar article, such as paper, bill, plastic sheeting, textile fabric etc.
According to the embodiment of the present invention, detect the voltage between the first battery lead plate and the second battery lead plate, to determine the thickness of object under test, without the data that detect are carried out to multiple conversion, reduce the error in conversion process, thereby solve the low problem of precision that object thickness detects, reached the effect of the precision that improves object thickness detection.
Preferably, the second battery lead plate comprises the 21 battery lead plate and the two or two battery lead plate, voltage comprises the first voltage and second voltage, and the first voltage is the voltage between the first battery lead plate and the 21 battery lead plate, and second voltage is the voltage between the first battery lead plate and the two or two battery lead plate.The thickness range of determining object under test according to voltage comprises: the voltage difference of calculating the first voltage and second voltage; Voltage difference is amplified, obtain differential voltage; Differential voltage and threshold voltage are compared, obtain comparative result; And determine the thickness range of object under test according to comparative result.
The method also can judge that whether the thickness of thin slice object is variant by the voltage difference detecting between the first voltage and second voltage, when thin slice object detects under electrode through out-of-date at two simultaneously, if two detect voltage difference between electrode in a certain threshold value, think that to detect slice substance body thickness under electrode through two identical, if voltage difference exceedes threshold value, think that two detect the slice substance body thickness difference under electrode.
The method also comprises that identification thin slice object enters under the 21 battery lead plate and do not enter entering of producing under the two or two battery lead plate voltage difference signal or thin slice object are walked out the 21 battery lead plate and walk out voltage difference signal while not walking out two or two battery lead plate.The entering voltage difference signal and walk out voltage difference signal only as judge that thin slice object enters circuit and walks out the mark of circuit of thin slice object, and conduct does not judge the foundation that slice substance body thickness is abnormal.
Particularly, as shown in Figure 3, the 21 battery lead plate the 201 and the 22 battery lead plate 202 symmetries be placed on the first battery lead plate 10 opposites, form two parallel plate capacitors, the first impedance transformation unit 3011 and impedance transformation unit 3012 access differential amplifying units 303, by differential amplification unit 303, two paths of signals is carried out to differential amplification, the output access comparing unit 302 after amplification.Differential amplification unit 303 can amplify the differential signal (i.e. the voltage difference of the first voltage and second voltage) between the first battery lead plate the 10 and the 21 battery lead plate 201 and the first battery lead plate 202, and can effectively suppress for the common-mode signal that affects two pole plates simultaneously; Thin slice object is simultaneously through two plate electrode lower times, when slice substance body thickness even, two to detect voltage on electrode identical, voltage after desirable differential amplification is 0, consider under two electrodes the inconsistent factors such as thin slice object vibrations, can be set to ± △ of the threshold voltage of comparing unit 302 U, at thin slice object simultaneously by the process of two pole plates, if exceed ± △ of the voltage after differential amplification is U, can think that slice substance body thickness is abnormal.It should be noted that, when object under test enter the 21 battery lead plate 201 times and entering of not entering that the two or two battery lead plate 202 times produces voltage difference signal or thin slice object are walked out the 21 battery lead plate 201 and walk out voltage difference signal only as judge that thin slice object enters circuit and walks out the mark of circuit while not walking out two or two battery lead plate 202, and conduct does not judge the foundation that slice substance body thickness is abnormal; Especially, enter voltage difference signal relevant with thin slice object translational speed with the size of walking out voltage difference signal, the speed that should enter circuit according to thin slice object accurately judges two voltage signals.
Preferably, the passable voltage threshold of the method for the embodiment of the present invention can be according to the different of environment temperature, humidity or the threshold voltage that can adjust according to the difference of thin slice object speed, thereby further improves the precision of testing result.
Preferably, the method for the embodiment of the present invention can also be used the variation of the carried charge of root thickness specimen page to electret the first battery lead plate to compensate.
Can accurately detect the abnormal of slice substance body thickness by the present invention, the circuit methods adopting is simple, volume compact, and precision is high, antijamming capability is strong and be convenient to Installation and Debugging.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. an object thickness pick-up unit, is characterized in that, comprising:
The first battery lead plate;
The second battery lead plate, arranges with described the first battery lead plate interval predeterminable range, and wherein, described the first battery lead plate and described the second battery lead plate form electric capacity; And
Testing agency, be connected respectively with described the second battery lead plate with described the first battery lead plate, for detection of the voltage between described the first battery lead plate and described the second battery lead plate, and determine the thickness range from the object under test that passes through between described the first battery lead plate and described the second battery lead plate according to described voltage.
2. object thickness pick-up unit according to claim 1, is characterized in that, described testing agency comprises:
Impedance transformation unit, is connected respectively with described the second battery lead plate with described the first battery lead plate, for by impedance transformation, described voltage being amplified to processing, and the voltage after being amplified; And
Comparing unit, is connected with described impedance transformation unit, for by the voltage after described amplification and threshold voltage compares and determine the thickness range of described object under test according to comparative result.
3. object thickness pick-up unit according to claim 2, is characterized in that, described impedance transformation unit comprises field effect transistor amplification circuit or transistor amplifier.
4. object thickness pick-up unit according to claim 1, it is characterized in that, described the second battery lead plate comprises the 21 battery lead plate and the two or two battery lead plate, wherein, described the 21 battery lead plate and described the two or two battery lead plate in the same side of described the first battery lead plate and all with predeterminable range setting described in described the first battery lead plate interval
Wherein, described testing agency is connected respectively with described the two or two battery lead plate with described the 21 battery lead plate, for detection of the first voltage and second voltage, described the first voltage is the voltage between described the 21 battery lead plate and described the first battery lead plate, and described second voltage is the voltage between described the two or two battery lead plate and described the first battery lead plate.
5. object thickness pick-up unit according to claim 4, is characterized in that, described testing agency comprises:
The first impedance transformation unit, is connected respectively with described the first battery lead plate with described the 21 battery lead plate, for by impedance transformation, described the first voltage being amplified, and the first voltage after being amplified;
The second impedance transformation unit, is connected respectively with described the first battery lead plate with described the two or two battery lead plate, for by impedance transformation, described second voltage being amplified, and the second voltage after being amplified;
Differential amplification unit, is connected respectively with described the second impedance transformation unit with described the first impedance transformation unit, amplifies for the voltage difference of the second voltage after the first voltage and described amplification to after described amplification, obtains differential voltage; And
Comparing unit, is connected with described differential amplification unit, for by described differential voltage and threshold voltage compares and determine the thickness range of described object under test according to comparative result.
6. according to the object thickness pick-up unit described in any one in claim 1 to 5, it is characterized in that,
Described the first battery lead plate is connected with power supply, and wherein, described power supply is for powering to described the first battery lead plate;
Or
Described the first battery lead plate is electret battery lead plate.
7. object thickness pick-up unit according to claim 6, is characterized in that, described object thickness pick-up unit also comprises:
Electric weight compensating unit, for compensating the carried charge of described electret battery lead plate.
8. according to the object thickness pick-up unit described in any one in claim 1 to 5, it is characterized in that, described object thickness pick-up unit also comprises:
Correcting unit, is connected with described testing agency, for described testing agency is proofreaied and correct.
9. for a detection method for object thickness pick-up unit, it is characterized in that, wherein, described object thickness pick-up unit comprises:
The first battery lead plate;
The second battery lead plate, arranges with described the first battery lead plate interval predeterminable range, and wherein, described the first battery lead plate and described the second battery lead plate form electric capacity, and object under test passes through between described the first battery lead plate and described the second battery lead plate; And
Testing agency, is connected respectively with described the second battery lead plate with described the first battery lead plate,
Wherein, described detection method comprises:
Detect the voltage between described the first battery lead plate and described the second battery lead plate; And
Determine the thickness range of described object under test according to described voltage.
10. detection method according to claim 9, it is characterized in that, described the second battery lead plate comprises the 21 battery lead plate and the two or two battery lead plate, described voltage comprises the first voltage and second voltage, described the first voltage is the voltage between described the first battery lead plate and described the 21 battery lead plate, described second voltage is the voltage between described the first battery lead plate and described the two or two battery lead plate, wherein, determines that the thickness range of described object under test comprises according to described voltage:
Calculate the voltage difference of described the first voltage and described second voltage;
Described voltage difference is amplified, obtain differential voltage;
Described differential voltage and threshold voltage are compared, obtain comparative result; And
Determine the thickness range of described object under test according to comparative result.
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| CN105806206A (en) * | 2016-03-25 | 2016-07-27 | 威海华菱光电股份有限公司 | Thickness detection device |
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| CN107402407A (en) * | 2017-07-31 | 2017-11-28 | 广东美的暖通设备有限公司 | Pipeline deposit detection means, heat pump and progress control method |
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| CN109187377A (en) * | 2018-09-21 | 2019-01-11 | 泉州装备制造研究所 | For detecting the detection device and detection method of photoactive composite material distribution consistency degree |
| CN110823260A (en) * | 2019-10-16 | 2020-02-21 | 杭州师范大学钱江学院 | Paper quantity detection device based on capacitive sensor and quantity detection method thereof |
| CN110823260B (en) * | 2019-10-16 | 2021-11-16 | 杭州师范大学钱江学院 | Paper quantity detection device based on capacitive sensor and quantity detection method thereof |
| CN110823081A (en) * | 2019-11-15 | 2020-02-21 | 衡水汉丰橡塑科技有限公司 | Auxiliary device is used in rubber diaphragm production |
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