CN105318820A - Thickness sensor - Google Patents
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- CN105318820A CN105318820A CN201510753397.6A CN201510753397A CN105318820A CN 105318820 A CN105318820 A CN 105318820A CN 201510753397 A CN201510753397 A CN 201510753397A CN 105318820 A CN105318820 A CN 105318820A
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Abstract
The invention provides a thickness sensor, comprising a generating electrode unit comprising a generating electrode; a signal generation circuit board in connection with the generating electrode, and used for making the generating electrode generate voltage input signals; an electrode detection unit comprising n sets of detection electrode couples successively arranged at intervals in a transmission direction of an object to be detected, wherein detection electrodes and the generating electrode are opposite and are arranged at intervals, the interval between the detection electrode couples and the generating electrode is a transmission channel for the object to be detected, and n is a constant greater than 1; and a signal processing circuit board connected with the detection electrode couples, and used for detecting voltage output signals of the detection electrode couples in the process of the object to be detected passing through the transmission channel, and converting the voltage output signals into a thickness distribution image. The thickness sensor can adjust the number of the detection electrode couples according to a physical length of the object to be detected, thereby effectively improving sensor measuring precision.
Description
Technical field
The present invention relates to field of measuring technique, in particular to a kind of thickness transducer.
Background technology
The application of thickness measure in every profession and trade is more and more extensive, for a lot of product, the online thickness measure of the objects such as such as paper, bill, plastic sheeting, textile fabric is in more and more consequence in the process such as production, detection, process, recovery of its product; Meanwhile, in financial industry, also utilize thickness detection apparatus to judge whether bank note posts adhesive tape etc.
Current, the object thickness detection technique that every profession and trade uses mainly comprises: use the technology such as hall device, reflection-type ultrasound wave, transmission-type are ultrasonic, induction, eddy current type to carry out the thickness of test sheets formula article.When these technology use as on-line thickness measurement technology, there is pick-up unit volume large, the shortcomings such as cost is high, uses inconvenience, and measuring accuracy is not high, thus limit the application of these Thickness sensitivity technology.
Therefore, need badly in prior art the thickness transducer that a kind of volume is little, lightweight, easy to use, measuring accuracy, applied range, cost are low is provided.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of thickness transducer, with the problem that the measuring accuracy solving thickness transducer in prior art is not high.
To achieve these goals, according to an aspect of the present invention, provide a kind of thickness transducer, comprising: generating electrodes unit, comprises generating electrodes; Signal generating circuit plate, is connected with generating electrodes, produces voltage input signal for making generating electrodes; Detect electrode unit, comprise n group and detect electrode pair along the transmission direction of article to be detected is spaced successively, detect electrode pair and interval relative with generating electrodes to arrange, and detect the transmission channel being spaced apart article to be detected between electrode pair and generating electrodes, n be greater than 1 constant; Signal processing circuit board, and detects electrode pair and is connected, and detects the voltage output signal of electrode pair, and voltage output signal is converted to thickness distribution image for detecting article to be detected in transmission channel process.
Further, respectively detect in electrode pair the electrode composition first that detects being positioned at side and detect electrode section, the electrode composition second that detects being positioned at opposite side respectively detected in electrode pair detects electrode section; Signal processing circuit board detects electrode section and second respectively and detects electrode section and be connected with first, and voltage output signal comprises first detects the first voltage output signal of electrode section and the second the second voltage detecting electrode section outputs signal.
Further, the projection of generating electrodes in the vertical direction covers and detects electrode pair.
Further, generating electrodes and detect electrode pair and be made up of elastic metallic material.
Further, elastic metallic material is phosphor bronze.
Further, generating electrodes unit also comprises: the first guard electrode, is connected with signal generating circuit plate, for shielding the noise signal around generating electrodes; First frame structure, is connected with generating electrodes and the first guard electrode, for carrying generating electrodes and the first guard electrode; And generating electrodes flushes towards the surface of transmission channel side with the surface of the first frame structure and the first guard electrode.
Further, detect electrode unit and also comprise: the second guard electrode, is connected with signal processing circuit board, for shielding the noise signal detecting surrounding them; Second frame structure, and detects electrode and the second guard electrode is connected, and detects electrode and the second guard electrode for carrying; And detect electrode and flush with the surface of the second frame structure and the second guard electrode towards the surface of transmission channel side.
Further, the first guard electrode and the second guard electrode are made up of elastic metallic material; First frame structure and the second frame structure are made up of insulating material.
Further, the first guard electrode is multiple, and generating electrodes has many sides, and each first guard electrode lays respectively at the side of generating electrodes; Second guard electrode is multiple, detects electrode pair and has many sides, and each second guard electrode lays respectively at the side detecting electrode pair.
Further, the first frame structure comprises the first frame and the second frame that are disposed adjacent, and the first frame is connected with the first guard electrode, and the second frame is connected with generating electrodes.
Further, the second frame structure comprises the 3rd frame and the 4th frame that are disposed adjacent, and the 3rd frame is connected with the second guard electrode, the 4th frame with detect Electrode connection.
Further, the first frame structure also comprise first of at least side being arranged at the first frame lead tooth be arranged at the second frame lead tooth with second of the relative at least side of the first frame, first leads tooth and second, and to lead tooth arranged in a crossed manner.
Further, the second frame structure also comprises the 3rd of at least side being arranged at the 3rd frame leads tooth and leads tooth with the 4th of at least side relative with the 3rd frame being arranged at the 4th frame, and the 3rd leads tooth and the 4th, and to lead tooth arranged in a crossed manner.
Further, signal generating circuit plate is arranged at the surface away from transmission channel side of the first frame structure, signal processing circuit board is arranged at the surface away from transmission channel side of the second frame structure, thickness transducer also comprises: the first protection framework, the surface away from the first frame structure side be arranged at; And/or second protects framework, is arranged at the surface away from the second frame structure side of signal processing circuit board.
Further, signal processing circuit board comprises the reading circuit, differential amplifier circuit and the signal processing circuit that connect successively, and reading circuit is used for receiver voltage output signal.
Apply technical scheme of the present invention, the invention provides one and comprise generating electrodes unit, detect electrode unit, the thickness transducer of signal generating circuit plate and signal processing circuit board, wherein, because generating electrodes unit comprises generating electrodes, detect electrode unit to comprise n group and detect electrode pair along the transmission direction of article to be detected is spaced successively, detect electrode pair and interval relative with generating electrodes to arrange, and the transmission channel being spaced apart article to be detected detected between electrode pair and generating electrodes, thus the number of electrode pair can be detected according to the physical length adjustment of article to be measured, thus effectively improve the measuring accuracy of sensor.
Except object described above, feature and advantage, the present invention also has other object, feature and advantage.Below with reference to figure, the present invention is further detailed explanation.
Accompanying drawing explanation
The Figure of description forming a part of the present invention is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 shows the diagrammatic cross-section of the thickness transducer that embodiment of the present invention provides;
Fig. 2 shows in the thickness transducer that embodiment of the present invention provides the schematic top plan view of the package assembly detecting electrode unit, signal processing circuit board and the second protection framework;
Fig. 3 shows in the thickness transducer that embodiment of the present invention provides the diagrammatic cross-section of the package assembly detecting electrode unit, signal processing circuit board and the second protection framework;
Fig. 4 shows the diagrammatic cross-section of the package assembly of generating electrodes unit in the thickness transducer that embodiment of the present invention provides, signal generating circuit plate and the first protection framework;
Fig. 5 shows the structural representation with the generating electrodes of pin that embodiment of the present invention provides;
Fig. 6 shows the diagrammatic cross-section of the another kind of thickness transducer that embodiment of the present invention provides;
Fig. 7 shows to be had first in the thickness transducer that Fig. 6 provides and leads the structural representation that tooth and second leads tooth;
Fig. 8 shows the structural representation detecting electrode pair with pin that embodiment of the present invention provides; And
Fig. 9 shows the process flow diagram of the control circuit of the thickness transducer that embodiment of the present invention provides.
Embodiment
It should be noted that, when not conflicting, the embodiment in the present invention and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
The present invention program is understood better in order to make those skilled in the art person, 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 embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained 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 need not be used for describing specific order or precedence.Should be appreciated that the data used like this can be exchanged, in the appropriate case 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, such as, contain those steps or unit that the process of series of steps or unit, method, system, product or equipment is not necessarily limited to clearly list, but can comprise clearly do not list or for intrinsic other step of these processes, method, product or equipment or unit.
As what introduce in background technology, need badly in prior art and the thickness transducer that a kind of volume is little, lightweight, easy to use, measuring accuracy, applied range, cost are low is provided.The present inventor studies for the problems referred to above, proposes a kind of thickness transducer, as shown in Fig. 1 to 2, comprising: generating electrodes 20 unit, comprises generating electrodes 20; Signal generating circuit plate 30, is connected with generating electrodes 20, produces voltage input signal for making generating electrodes 20; Detect electrode unit, comprise n group and detect electrode pair 601 along the transmission direction of article 100 to be detected is spaced successively, detect electrode pair 601 and interval relative with generating electrodes 20 to arrange, and the transmission channel 180, n being spaced apart article 100 to be detected detected between electrode pair 601 and generating electrodes 20 be greater than 1 constant; Signal processing circuit board 90, and detects electrode pair 601 and is connected, and detects the voltage output signal of electrode pair 601, and voltage output signal is converted to thickness distribution image for detecting article 100 to be detected in transmission channel 180 process.
Comprise n group and detect electrode pair 601 owing to detecting electrode unit along the transmission direction of article 100 to be detected is spaced successively in above-mentioned thickness transducer, detect electrode pair 601 and interval relative with generating electrodes 20 to arrange, and the transmission channel 180 being spaced apart article 100 to be detected detected between electrode pair 601 and generating electrodes 20, thus the number of electrode pair 601 can be detected according to the physical length adjustment of article to be measured, thus effectively improve the measuring accuracy of sensor.
As seen from Figure 1, generating electrodes 20 unit and detect electrode unit and can opposing parallelly place, and form transmission channel 180, generating electrodes 20 and detect the structure that electrode pair 601 forms capacity plate antenna, after generating electrodes 20 is charged, detect the opposite polarity electric charge that electrode will induce equivalent, just there is certain capacitance between the two, the size of capacitance has depended on the area of two electrodes, distance that two electrodes are separated by, generating electrodes 20 have been executed specific inductive capacity between alive size and two electrodes.After structure is determined, the area of electrode will remain unchanged, the distance simultaneously keeping the voltage in generating electrodes 20 and two electrodes to be separated by is constant, so, the size of capacitance is only relevant to the specific inductive capacity between two electrodes, therefore, after article 100 to be detected enter transmission channel 180, specific inductive capacity will change, generating electrodes 20 and the capacitance detected between electrode is caused to change, according to these changing values, by remaining processing sequences, the gauge of article 100 to be detected just can be obtained.
State on the invention in thickness transducer, respectively detect in electrode pair 601 the electrode composition first that detects being positioned at side and detect electrode section 610, the electrode composition second that detects being positioned at opposite side respectively detected in electrode pair 601 detects electrode section 620, as Fig. 2; Signal processing circuit board 90 detects electrode section 610 and second respectively and detects electrode section 620 and be connected with first, and voltage output signal comprises the second voltage output signal that the first the first voltage output signal and second detecting electrode section 610 detects electrode section 620, as shown in Figure 3.
N group in above-mentioned thickness transducer detects electrode pair 601 and detects electrode section 610 and second by first and detect electrode section 620 and form, wherein detect electrode be arranged in a straight line a plurality of, distribute in pairs, and independent mutually.First detect in electrode section 610 each detect electrode with its longitudinally the corresponding second electrode that detects detected in electrode section 620 form one group and detect electrode pair 601, and as a minimum signal detecting unit, being arranged n in an imageing sensor in the longitudinal direction altogether to detecting electrode, that is to say that sensor has n pixel.The size of n depends on actual scanning object and the requirement to scanning resolution, and such as, be provided with 44 pixels in imageing sensor, the gap periods between pixel is 5mm, then the effective length scanned is 220mm.
The electrode that detects being used for induced charge is divided into two identical structures and adjacent first detects electrode section 610 and second and detect electrode section 620, in signal processing circuit board 90, the signal got in two induction electrode portions carries out differential amplification process, effectively can eliminate the impact that the noise signal detected on electrode brings, greatly improve the precision of measurement.
State on the invention in thickness transducer, preferably, the projection detecting electrode pair 601 in the vertical direction covers generating electrodes 20.Above-mentionedly preferred embodiment can make to detect electrode pair 601 and can induce the electric charge relative with generating electrodes 20 more, even induce the electric charge with generating electrodes 20 equivalent, thus defining more induced charge pair, more induced charge can improve the measuring accuracy of thickness transducer further through wherein time at article 100 to be detected.
In above-mentioned thickness transducer detect electrode pair 601 and generating electrodes 20 can be made up of elastic metallic material.More preferably, above-mentionedly detect electrode pair 601 and generating electrodes 20 adopts phosphor bronze thin slice, and process through the process such as punching press or etching.Because phosphor bronze material has good corrosion stability and wear-resistant, to conduct electricity very well and elasticity is large, thus not only make generating electrodes 20 more effectively can produce voltage input signal, improve the transfer efficiency transmitted and detect electrode pair 601 and voltage is outputed signal, by the high corrosion-resistant of phosphor bronze material, wearing quality and elasticity, the reliability of thickness transducer can also be improved.
State on the invention in thickness transducer, preferably, generating electrodes 20 unit can also comprise: the first guard electrode 40, first guard electrode 40 is connected with signal generating circuit plate 30, for shielding the noise signal around generating electrodes 20; First frame structure 10, is connected with generating electrodes 20 and the first guard electrode 40, for carrying generating electrodes 20 and the first guard electrode 40; And generating electrodes 20 flushes towards the surface of transmission channel 180 side with the surface of the first frame structure 10 and the first guard electrode 40.Above-mentioned first guard electrode 40 can reduce the interference of ambient noise signal to generating electrodes 20 signal effectively by being connected with the ground in signal generating circuit plate 30.Generating electrodes 20 and the first guard electrode 40 can be connected into an entirety by above-mentioned first frame structure 10; namely generating electrodes 20 and the first guard electrode 40 are embedded in same framework; make the good integrity of thickness transducer, transmission channel 180 easily ensures smooth, and object to be detected easily passes through
In order to effectively reduce the interference of ambient noise signal to generating electrodes 20 signal, above-mentioned first guard electrode 40 can be multiple, and generating electrodes 20 has many sides.Now, the first guard electrode 40 is arranged at least side of generating electrodes 20.Preferably, each first guard electrode 40 lays respectively at the side of generating electrodes 20, as shown in Figure 4.In another preferred embodiment, being positioned at first guard electrode 40 of generating electrodes 20 to every side can be interconnected.
Generating electrodes 20 can have the first pin two 01, as shown in Figure 5.Now, the first pin two 01 of generating electrodes 20 is connected with signal generating circuit plate 30, and above-mentioned first pin two 01 achieves the good contact of generating electrodes 20 and signal processing circuit board 90.Further, above-mentioned first guard electrode 40 can have the second pin.Now, the second pin of the first guard electrode 40 can be connected with signal generating circuit plate 30 respectively.Above-mentioned second pin achieves the good contact of the first guard electrode 40 and signal processing circuit board 90.
The first guard electrode 40 in above-mentioned thickness transducer can be made up of elastic metallic material.More preferably, above-mentioned first guard electrode 40 adopts phosphor bronze thin slice, and processes through the process such as punching press or etching.Because phosphor bronze material has good corrosion stability and wear-resistant; to conduct electricity very well and elasticity is large; thus not only make the first guard electrode 40 play the effect more effectively shielding the noise signal around generating electrodes 20; by the high corrosion-resistant of phosphor bronze material, wearing quality and elasticity, the reliability of thickness transducer can also be improved.
Above-mentioned first frame structure 10 can be the same framework being connected with generating electrodes 20 and the first guard electrode 40, and said structure makes the good integrity of thickness transducer, thus effectively ensure that the planarization of transmission channel 180, and article 100 to be detected are easily passed through; But this structure makes the mould structure of thickness transducer complicated, and precision not easily ensures.In order to solve the problem; preferably, above-mentioned first frame structure 10 can comprise the first frame 101 of being disposed adjacent and the second frame 102, first frame 101 is connected with the first guard electrode 40 further; second frame 102 is connected with generating electrodes 20, as shown in Figure 6.By the first frame structure 10 being divided into first frame 101 and second frame 102 two parts; and the first frame 101 and the first guard electrode 40 are combined; second frame 102 is combined with generating electrodes 20; thus effectively simplify mould structure; improve yield rate, and then reduce cost.
First frame structure 10 is made for insulating material, and preferably, insulating material is plastics.Generating electrodes 20 and the first guard electrode 40 can fit together with the first frame structure 10 in several ways, such as hot pressing, bonding, injection mo(u)lding etc.Preferably, adopt the mode of injection moulding integrated molding, generating electrodes 20 and the first guard electrode 40 are directly injected in the first frame structure 10 as inserts.
In above-mentioned the first frame structure 10 be made up of the first frame 101 and the second frame 102, transmission channel 180 can be smoothly through to make article 100 to be detected, in a preferred embodiment, the adjacent of the first frame 101 and the second frame 102 is provided with the first V-shaped groove 111.By adopting the mode of V-shaped groove at the adjacent of the first frame 101 and the second frame 102, effectively avoid framework junction uneven, thus the problem causing transmission channel 180 not smooth.
In another preferred embodiment, first frame structure 10 also comprise first of at least side being arranged at the first frame 101 lead tooth 121 be arranged at the second frame 102 lead tooth 122 with second of the relative at least side of the first frame 101, first leads tooth 121 and second, and to lead tooth 122 arranged in a crossed manner, as shown in Figure 7.By the above-mentioned cross connection leading tooth, make the connection transition of the first frame 101 and the second frame 102 more level and smooth.
State on the invention in thickness transducer, preferably, detect electrode unit and also comprise: the second guard electrode 80, is connected with signal processing circuit board 90, for shielding the noise signal detecting surrounding them; Second frame structure 50, and detects electrode and the second guard electrode 80 is connected, and detects electrode and the second guard electrode 80 for carrying; And detect electrode and flush with the surface of the second frame structure 50 and the second guard electrode 80 towards the surface of transmission channel 180 side.Above-mentioned second guard electrode 80 can reduce the interference of ambient noise signal to generating electrodes 20 signal effectively by being connected with the ground in signal generating circuit plate 30 equally; Above-mentioned second frame structure 50 can will detect electrode and the second guard electrode 80 connects into an entirety; namely electrode is detected and the second guard electrode 80 is embedded in same framework; make the good integrity of thickness transducer, transmission channel 180 easily ensures smooth, and object to be detected easily passes through.
In order to effectively reduce the interference of ambient noise signal to generating electrodes 20 signal, above-mentioned second guard electrode 80 can be multiple, detects electrode pair 601 and has many sides, and now, the second guard electrode 80 is arranged at least side detecting electrode pair 601.Preferably, each second guard electrode 80 lays respectively at the side detecting electrode pair 601, as shown in Figure 2.In another preferred embodiment, being positioned at the second guard electrode 80 detecting the every side of electrode pair 601 can be interconnected.
Preferably, first in the electrode pair 601 that detect in above-mentioned thickness transducer detects electrode section 610 and can have the three-prong 611 being positioned at its one end and the first rhaeboscelia portion 612 being positioned at another section away from three-prong 611, second detects electrode section 620 can have the 4th pin 621 being positioned at its one end and the second rhaeboscelia portion 622 being positioned at another section away from pin, as shown in Figure 8.Now, three-prong 611 is connected with signal generating circuit plate 30 respectively with the 4th pin 621, and the first rhaeboscelia portion 612 and the second rhaeboscelia portion 622 are arranged in signal processing circuit board 90 respectively.Above-mentioned three-prong 611 and the 4th pin 621 achieve the good contact detecting electrode pair 601 and signal processing circuit board 90, and above-mentioned first rhaeboscelia portion 612 and the second rhaeboscelia portion 622 make to detect electrode pair 601 and be more stably arranged in the second frame structure 50.
Further, above-mentioned second guard electrode 80 also can have the 5th pin 801.Now, the 5th pin 801 can be connected with signal processing circuit board 90.Above-mentioned 5th pin 801 achieves the good contact of the second guard electrode 80 and signal processing circuit board 90.
The second guard electrode 80 in above-mentioned thickness transducer can be made up of elastic metallic material.More preferably, above-mentioned second guard electrode 80 adopts phosphor bronze thin slice, and processes through the process such as punching press or etching.Because phosphor bronze material has good corrosion stability and wear-resistant; to conduct electricity very well and elasticity is large; thus not only make the second guard electrode 80 play the effect more effectively shielding and detect the noise signal of surrounding them; by the high corrosion-resistant of phosphor bronze material, wearing quality and elasticity, the reliability of thickness transducer can also be improved.
Above-mentioned second frame structure 50 can be connected with the same framework detecting electrode and the second guard electrode 80, and said structure makes the good integrity of thickness transducer, thus effectively ensure that the planarization of transmission channel 180, and article 100 to be detected are easily passed through; But this structure makes the mould structure of thickness transducer complicated, and precision not easily ensures.In order to solve the problem; preferably, above-mentioned second frame structure 50 can comprise the 3rd frame 501 that is disposed adjacent and the 4th frame the 502, three frame 501 is connected with the second guard electrode 80 further; 4th frame 502 with detect Electrode connection, as shown in Figure 6.By the second frame structure 50 being divided into the 3rd frame 501 and the 4th frame 502 two parts; and the 3rd frame 501 and the second guard electrode 80 are combined; by the 4th frame 502 with detect electrode and combine; thus effectively simplify mould structure; improve yield rate, and then reduce cost.
Second frame structure 50 is made for insulating material, and preferably, insulating material is plastics.Detect electrode and the second guard electrode 80 can fit together with the second frame structure 50 in several ways, such as hot pressing, bonding, injection mo(u)lding etc.Preferably, the mode of employing injection moulding integrated molding, will detect electrode and the second guard electrode 80 is directly injected in the second frame structure 50 as inserts.
In above-mentioned the second frame structure 50 be made up of the 3rd frame 501 and the 4th frame 502, transmission channel 180 can be smoothly through to make article 100 to be detected, in a preferred embodiment, the adjacent of the 3rd frame 501 and the 4th frame 502 is provided with the second V-shaped groove 511.By adopting the mode of V-shaped groove at the adjacent of the 3rd frame 501 and the 4th frame 502, effectively avoid framework junction uneven, thus the problem causing transmission channel 180 not smooth.
In another preferred embodiment, second frame structure 50 also comprises the 3rd of at least side being arranged at the 3rd frame 501 leads tooth and leads tooth with the 4th of at least side relative with the 3rd frame 501 being arranged at the 4th frame 502, and the 3rd leads tooth and the 4th leads tooth (the 3rd lead tooth and the 4th lead tooth not shown in figures) arranged in a crossed manner.By the above-mentioned cross connection leading tooth, make the connection transition of the 3rd frame 501 and the 4th frame 502 more level and smooth.
State on the invention in thickness transducer, signal generating circuit plate 30 is arranged at the surface away from transmission channel 180 side of the first frame structure 10, signal processing circuit board 90 is arranged at the surface away from transmission channel 180 side of the second frame structure 50, now, thickness transducer can also comprise: the first protection framework, is arranged at the surface away from the first frame structure 10 side of signal generating circuit plate 30; And/or second protects framework, is arranged at the surface away from the second frame structure 50 side of signal processing circuit board 90.Above-mentioned first frame structure 10 is for the protection of parts such as signal generating circuit plate 30 grade, and above-mentioned second frame structure 50 is for the protection of parts such as signal processing circuit board 90 grade; Meanwhile, above-mentioned first frame structure 10 and the second frame structure 50 also can prevent pin and external contact and the harmful effect such as the short circuit caused or signal disturbing.The material of above-mentioned first frame structure 10 and the second frame structure 50 can be metal material, also can be nonmetallic materials, and preferably, the first frame structure 10 and the second frame structure 50 adopt aluminium alloy to be prepared from.
State on the invention in thickness transducer, signal processing circuit 903 plate 90 can comprise the reading circuit 901, differential amplifier circuit 902 and the signal processing circuit 903 that connect successively, and reading circuit 901 outputs signal for receiver voltage.Be illustrated in figure 9 the process flow diagram of the control circuit of the above-mentioned thickness transducer of the present invention, due to generating electrodes 20 unit with detect electrode unit and define a group capacitor, signal generating circuit plate 30 is utilized to make generating electrodes 20 and to detect electrode charged, thus make this group capacitor have certain capacitance, when article 100 to be detected enter generating electrodes 20 unit and detect between electrode unit, the capacitance of this group capacitor will change, these changing values enter reading circuit 901, then enter differential amplifier circuit 902 and carry out signal transacting and signal amplification, last entering signal treatment circuit 903, carry out digitizing and calculation process, form the image of the thickness distribution of article 100 to be detected.
From above description, can find out, the above embodiments of the present invention achieve following technique effect: because generating electrodes unit comprises generating electrodes, detect electrode unit to comprise n group and detect electrode pair along the transmission direction of article to be detected is spaced successively, detect electrode pair and interval relative with generating electrodes to arrange, and the transmission channel being spaced apart article to be detected detected between electrode pair and generating electrodes, thus the number of electrode pair can be detected according to the physical length adjustment of article to be measured, thus effectively improve the measuring accuracy of sensor.
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 done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (15)
1. a thickness transducer, is characterized in that, comprising:
Generating electrodes unit, comprises generating electrodes (20);
Signal generating circuit plate (30), is connected with described generating electrodes (20), produces voltage input signal for making described generating electrodes (20);
Detect electrode unit, comprise n group and detect electrode pair (601) along the transmission direction of article to be detected (100) is spaced successively, described electrode pair (601) and the interval relative with described generating electrodes (20) that detect is arranged, and described in detect the transmission channel (180) being spaced apart described article to be detected (100) between electrode pair (601) and described generating electrodes (20), described n be greater than 1 constant;
Signal processing circuit board (90), be connected with the described electrode pair (601) that detects, for detecting described article to be detected (100) through detecting the voltage output signal of electrode pair (601) described in described transmission channel (180) process, and described voltage output signal is converted to thickness distribution image.
2. thickness transducer according to claim 1, is characterized in that,
Detect in electrode pair (601) the electrode composition that detects being positioned at side described in each and first detect electrode section (610), detect being positioned in electrode pair (601) described in each and detect electrode composition second described in opposite side and detect electrode section (620);
Described signal processing circuit board (90) detects electrode section (610) and described second respectively and detects electrode section (620) and be connected with described first, and described voltage output signal comprises described first detects the first voltage output signal of electrode section (610) and the described second the second voltage detecting electrode section (620) outputs signal.
3. thickness transducer according to claim 1, is characterized in that, detects electrode pair (601) described in the projection covering of described generating electrodes (20) in the vertical direction.
4. thickness transducer according to any one of claim 1 to 3, is characterized in that, described generating electrodes (20) and the described electrode pair (601) that detects are made up of elastic metallic material.
5. thickness transducer according to claim 4, is characterized in that, described elastic metallic material is phosphor bronze.
6. thickness transducer according to claim 4, is characterized in that, described generating electrodes unit also comprises:
First guard electrode (40), is connected with described signal generating circuit plate (30), for shielding described generating electrodes (20) noise signal around;
First frame structure (10), is connected with described generating electrodes (20) and described first guard electrode (40), for carrying described generating electrodes (20) and described first guard electrode (40);
And described generating electrodes (20) flushes towards the surface of described transmission channel (180) side with the surface of described first frame structure (10) and described first guard electrode (40).
7. thickness transducer according to claim 6, is characterized in that, described in detect electrode unit and also comprise:
Second guard electrode (80), is connected with described signal processing circuit board (90), for detecting the noise signal of surrounding them described in shielding;
Second frame structure (50), detects electrode with described and described second guard electrode (80) is connected, described in carrying, detect electrode and described second guard electrode (80);
And described in detect electrode and flush with the surface of described second frame structure (50) and described second guard electrode (80) towards the surface of described transmission channel (180) side.
8. thickness transducer according to claim 7, is characterized in that,
Described first guard electrode (40) and described second guard electrode (80) are made up of elastic metallic material;
Described first frame structure (10) and described second frame structure (50) are made up of insulating material.
9. thickness transducer according to claim 7, is characterized in that,
Described first guard electrode (40) is for multiple, and described generating electrodes (20) has many sides, and each described first guard electrode (40) lays respectively at the side of described generating electrodes (20);
Described second guard electrode (80) for multiple, described in detect electrode pair (601) there is many sides, detect the side of electrode pair (601) described in each described second guard electrode (80) lays respectively at.
10. thickness transducer according to claim 7; it is characterized in that; described first frame structure (10) comprises the first frame (101) and the second frame (102) that are disposed adjacent; described first frame (101) is connected with described first guard electrode (40), and described second frame (102) is connected with described generating electrodes (20).
11. thickness transducers according to claim 7; it is characterized in that; described second frame structure (50) comprises the 3rd frame (501) and the 4th frame (502) that are disposed adjacent; described 3rd frame (501) is connected with described second guard electrode (80), and described 4th frame (502) detects Electrode connection with described.
12. thickness transducers according to claim 10, it is characterized in that, described first frame structure (10) also comprise first of at least side being arranged at described first frame (101) lead tooth (121) be arranged at described second frame (102) lead tooth (122) with second of the relative at least side of described first frame (101), described first leads tooth and described second, and to lead tooth arranged in a crossed manner.
13. thickness transducers according to claim 11, it is characterized in that, described second frame structure (50) also comprises the 3rd of at least side being arranged at described 3rd frame (501) and leads tooth and lead tooth with the 4th of at least side relative with described 3rd frame (501) being arranged at described 4th frame (502), and the described 3rd leads tooth and the described 4th, and to lead tooth arranged in a crossed manner.
14. thickness transducers according to claim 7, it is characterized in that, described signal generating circuit plate (30) is arranged at the surface away from described transmission channel (180) side of described first frame structure (10), described signal processing circuit board (90) is arranged at the surface away from described transmission channel (180) side of described second frame structure (50), and described thickness transducer also comprises:
First protection framework (110), is arranged at the surface away from described first frame structure (10) side of described (30); And/or
Second protection framework (120), is arranged at the surface away from described second frame structure (50) side of signal processing circuit board (90).
15. thickness transducers according to claim 1, it is characterized in that, signal processing circuit board (90) comprises the reading circuit (901), differential amplifier circuit (902) and the signal processing circuit (903) that connect successively, and described reading circuit is for receiving described voltage output signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510753397.6A CN105318820A (en) | 2015-11-05 | 2015-11-05 | Thickness sensor |
Applications Claiming Priority (1)
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| CN106197248A (en) * | 2016-07-21 | 2016-12-07 | 威海华菱光电股份有限公司 | The detection device of thickness |
| CN106412465A (en) * | 2016-06-14 | 2017-02-15 | 威海华菱光电股份有限公司 | Image sensor |
| CN107860304A (en) * | 2017-10-24 | 2018-03-30 | 威海华菱光电股份有限公司 | The thickness detection apparatus of film |
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