CN105333808A - Displacement detection circuit, eddy current displacement sensor as well as correcting circuit and method thereof - Google Patents
Displacement detection circuit, eddy current displacement sensor as well as correcting circuit and method thereof Download PDFInfo
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Abstract
The invention discloses a displacement detection circuit, an eddy current displacement sensor as well as a correcting circuit and method thereof. A correcting circuit of the eddy current displacement sensor comprises a generating circuit, a diode and an adding circuit, wherein the input end of the generating circuit is used for receiving the output voltage of the eddy current displacement sensor, and the output end of the generating circuit is used for outputting a regulating voltage in proportion to the output voltage; the anode of the diode is connected with the output end of the generating circuit; and the input end of the adding circuit is connected with the cathode of the diode, and receives the output voltage, and the output end of the adding circuit is used for outputting a correction voltage obtained after the output voltage is compensated. According to the invention, the technical problem that in the prior art, the circuit structure of a correcting circuit of an eddy current displacement sensor is complex is solved.
Description
Technical field
The present invention relates to electronic circuit field, in particular to a kind of displacement detecting circuit, eddy current displacement sensor and correcting circuit thereof and method.
Background technology
Current vortex sensor is as non-contact measurement components and parts, be applied in displacement detector, Fig. 1 is the output voltage of current vortex sensor and the curve map of detecting distance, as shown in Figure 1, the voltage that current vortex sensor exports is in certain sensing range, linear with detecting distance, but the distance exceeding its voltage exported of certain scope and detection is no longer linear relationship, and therefore the quoting of gamma correction technology of current vortex sensor is vital.Diagrammatically illustrating detecting distance S0 place in Fig. 1 is linear flex point place, and at detecting distance S0 place, the output voltage of current vortex sensor is V0, and wherein, detecting distance refers to the distance between detection bodies and the probe of current vortex sensor.
In prior art, the main two kinds of methods of eddy current displacement sensor linear correction method, one is software linearity correction method, its method is come in by raw data acquisition by chip, corrected by methods such as curves again, this method must pass through routine processes, therefore response speed is comparatively slow, and dynamic response is poor.Another kind method realizes correcting by hardware circuit, method conventional is at present by exponent arithmetic circuit realiration linear compensation etc., this method complex circuit designs, and exponent arithmetic circuit is only to remotely working, on the contrary there is attenuation to nearer distance, affect compensation effect.
For above-mentioned problem, at present effective solution is not yet proposed.
Summary of the invention
Embodiments provide a kind of displacement detecting circuit, eddy current displacement sensor and correcting circuit thereof and method, at least to solve the technical matters of the circuit structure complexity of the correcting circuit of eddy current displacement sensor in prior art.
According to an aspect of the embodiment of the present invention, provide a kind of correcting circuit of eddy current displacement sensor, comprise: produce circuit, input end is for receiving the output voltage of described eddy current displacement sensor, and output terminal is for exporting the regulation voltage proportional with described output voltage; Diode, anode is connected with the output terminal of described generation circuit; And adding circuit, input end is connected with the negative electrode of described diode, and receives described output voltage, and output terminal is for exporting the correction voltage after compensating described output voltage.
Further, described generation circuit comprises: the first operational amplifier, and input end is for receiving described output voltage, and output terminal is connected with the anode of described diode; And first peripheral circuit, be connected with described first operational amplifier.
Further, described first peripheral circuit comprises: the first resistance, and first end is for receiving described output voltage, and the second end is connected with the normal phase input end of described first operational amplifier; Second resistance, is connected between first node and signal ground, and wherein, described first node is the node between the second end of described first resistance and the normal phase input end of described first operational amplifier; 3rd resistance, between the inverting input being connected to signal ground and described first operational amplifier; And the 4th resistance, be connected between Section Point and the 3rd node, wherein, described Section Point is the node between described 3rd resistance and the inverting input of described first operational amplifier, and described 3rd node is the node between the output terminal of described first operational amplifier and the anode of described diode.
Further, described first resistance is identical with the resistance of described 3rd resistance, and described second resistance is identical with the resistance of described 4th resistance.
Further, described adding circuit comprises: the second operational amplifier, and input end is connected with the negative electrode of described diode, and receives described output voltage, and output terminal is for exporting described correction voltage; And second peripheral circuit, be connected with described second operational amplifier.
Further, described second peripheral circuit comprises: the 5th resistance, and first end is for receiving described output voltage, and the second end is connected with the normal phase input end of described second operational amplifier; 6th resistance, is connected between the negative electrode of described diode and the normal phase input end of described second operational amplifier; 7th resistance, between the inverting input being connected to signal ground and described second operational amplifier; And the 8th resistance, between the output terminal being connected to the 4th node and described second operational amplifier, wherein, described 4th node is the node between described 7th resistance and the inverting input of described second operational amplifier.
Further, described 5th resistance is identical with the resistance of described 7th resistance, and described 6th resistance is identical with the resistance of described 8th resistance.
Further, described correcting circuit also comprises: the 9th resistance, between the negative electrode being connected to described diode and signal ground.
According to the another aspect of the embodiment of the present invention, additionally provide a kind of eddy current displacement sensor, this eddy current displacement sensor comprises the correcting circuit of any one eddy current displacement sensor that foregoing of the present invention provides.
According to the another aspect of the embodiment of the present invention, additionally provide a kind of displacement detecting circuit, this displacement detecting circuit comprises any one eddy current displacement sensor that foregoing of the present invention provides.
According to the another aspect of the embodiment of the present invention, additionally provide a kind of embodiment of bearing calibration of eddy current displacement sensor, comprise: when the output voltage of described eddy current displacement sensor is greater than predeterminated voltage, calculate the regulation voltage proportional with described output voltage; And utilize described regulation voltage to compensate described output voltage, obtain the correction voltage of described output voltage.
In embodiments of the present invention, adopt the correcting circuit with the eddy current displacement sensor of following structure: produce circuit, input end is for receiving the output voltage of described eddy current displacement sensor, and output terminal is for exporting the regulation voltage proportional with described output voltage; Diode, anode is connected with the output terminal of described generation circuit; And adding circuit, input end is connected with the negative electrode of described diode, and receives described output voltage, and output terminal is for exporting the correction voltage after compensating described output voltage.The circuit generation regulation voltage proportional with the output voltage of eddy current displacement sensor is produced by utilizing, and regulation voltage and original output voltage are all delivered to adding circuit, achieve and utilize regulation voltage to compensate output voltage, obtain correction voltage.In correcting circuit, the setting of diode then can ensure before output voltage reaches certain magnitude of voltage, diode is cut-off, adding circuit receives only output voltage, after output voltage reaches this magnitude of voltage, diode current flow, adding circuit utilizes regulation voltage to compensate output voltage, obtain correction voltage, namely achieve the output voltage of eddy current displacement sensor and detecting distance linear time, do not carry out the compensation of voltage, when the two becomes nonlinear relationship, carry out voltage compensation, realize linearity correction.This kind of correcting circuit only need produce associated adjustment voltage, adding circuit is utilized to carry out voltage compensation, utilize the conducting of diode or cut-off whether to carry out control and compensation simultaneously, building of circuit is fairly simple, reach reduction circuit cost, improve the technique effect of circuit stability, and then solve the technical matters of circuit structure complexity of correcting circuit of eddy current displacement sensor in prior art.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, 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 is the output voltage of current vortex sensor and the curve map of detecting distance;
Fig. 2 is the schematic diagram of the correcting circuit of eddy current displacement sensor according to the embodiment of the present invention;
Fig. 3 is the voltage of diode D and the curve map of electric current in the correcting circuit according to the eddy current displacement sensor of the embodiment of the present invention;
Fig. 4 is after carrying out voltage correction according to the correcting circuit of the eddy current displacement sensor of the embodiment of the present invention, the output voltage of current vortex sensor and the curve map of detecting distance;
Fig. 5 is the circuit diagram of the correcting circuit of eddy current displacement sensor according to the embodiment of the present invention; And
Fig. 6 is the process flow diagram of the bearing calibration of eddy current displacement sensor according to the embodiment of the present invention.
Embodiment
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 as embodiments of the invention described herein can with except here diagram or describe those except order implement.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.
Fig. 2 is the schematic diagram of the correcting circuit of eddy current displacement sensor according to the embodiment of the present invention, and as shown in Figure 2, this correcting circuit comprises and produces circuit 10, diode D and adding circuit 20.
Produce the input end of circuit 10 for receiving the output voltage of eddy current displacement sensor, output terminal is for exporting the regulation voltage proportional with output voltage.
The anode of diode D is connected with the output terminal producing circuit 10.
The input end of adding circuit 20 is connected with the negative electrode of diode D, and receives output voltage, and output terminal is for exporting the correction voltage after compensating output voltage.
Produce circuit and can produce the regulation voltage proportional with the output voltage of eddy current displacement sensor.
Fig. 3 is the voltage of diode D and the curve map of electric current in the correcting circuit according to the eddy current displacement sensor of the embodiment of the present invention.As shown in Figure 3, diode D has one-way conduction characteristic, and when being added in the voltage on diode D and being less than on state threshold voltage Vth, diode D is cut-off, when being added in the voltage on diode D and being more than or equal on state threshold voltage Vth, and diode D conducting.
In embodiments of the present invention, produce the regulation voltage that the output terminal of circuit 10 exports need meet the following conditions: the output voltage of eddy current displacement sensor and detecting distance linear time, the voltage that the output terminal producing circuit 10 exports is less than the on state threshold voltage of diode D, diode D is cut-off, adding circuit receives only output voltage, does not now carry out voltage compensation; When the output voltage of eddy current displacement sensor becomes nonlinear relationship with detecting distance, the voltage that the output terminal producing circuit 10 exports is greater than the on state threshold voltage of diode D, and diode D is conducting.
Fig. 4 is after carrying out voltage correction according to the correcting circuit of the eddy current displacement sensor of the embodiment of the present invention, the output voltage of current vortex sensor and the curve map of detecting distance.As shown in Figure 4, due to when the output voltage of eddy current displacement sensor becomes nonlinear relationship with detecting distance, the voltage that the output terminal producing circuit 10 exports is greater than the on state threshold voltage of diode D, diode D is conducting, now, adding circuit can utilize regulation voltage to compensate output voltage, obtains correction voltage, realizes linearity correction.V
outwhen expression does not use correcting circuit to carry out correcting, the output voltage of eddy current displacement sensor.V
outwhen ' expression uses correcting circuit to carry out correcting, the output voltage of eddy current displacement sensor.
The circuit generation regulation voltage proportional with the output voltage of eddy current displacement sensor is produced by utilizing, and regulation voltage and original output voltage are all delivered to adding circuit, achieve and utilize regulation voltage to compensate output voltage, obtain correction voltage.In correcting circuit, the setting of diode then can ensure before output voltage reaches certain magnitude of voltage, diode is cut-off, adding circuit receives only output voltage, after output voltage reaches this magnitude of voltage, diode current flow, adding circuit utilizes regulation voltage to compensate output voltage, obtain correction voltage, namely achieve the output voltage of eddy current displacement sensor and detecting distance linear time, do not carry out the compensation of voltage, when the two becomes nonlinear relationship, carry out voltage compensation, realize linearity correction.This kind of correcting circuit only need produce associated adjustment voltage, adding circuit is utilized to carry out voltage compensation, utilize the conducting of diode or cut-off whether to carry out control and compensation simultaneously, building of circuit is fairly simple, reach reduction circuit cost, improve the technique effect of circuit stability, and then solve the technical matters of circuit structure complexity of correcting circuit of eddy current displacement sensor in prior art.
Fig. 5 is the circuit diagram of the correcting circuit of eddy current displacement sensor according to the embodiment of the present invention, as shown in Figure 5, in embodiments of the present invention, produces circuit 10 and comprises the first operational amplifier U1 and the first peripheral circuit.The input end of the first operational amplifier U1 is for receiving output voltage, and the output terminal of the first operational amplifier U1 is connected with the anode of diode D.First peripheral circuit is the peripheral circuit of the first operational amplifier U1, is connected with the first operational amplifier U1.
Alternatively, the first peripheral circuit comprises the first resistance R1, the second resistance R2, the 3rd resistance R3 and the 4th resistance R4.The first end of the first resistance R1 is for receiving output voltage, and the second end is connected with the normal phase input end of the first operational amplifier U1.Second resistance R2 is connected between first node and signal ground, and wherein, first node is the node between second end of the first resistance R1 and the normal phase input end of the first operational amplifier U1.3rd resistance R3 is connected between the inverting input of signal ground and the first operational amplifier U1.4th resistance R4 is connected between Section Point and the 3rd node, wherein, Section Point is the node between the inverting input of the 3rd resistance R3 and the first operational amplifier U1, and the 3rd node is the node between the output terminal of the first operational amplifier U1 and the anode of diode D.
In the correcting circuit of eddy current displacement sensor illustrated in fig. 5, the output voltage before the correction of eddy current displacement sensor is V
outtime, that is, the voltage that the normal phase input end of the first operational amplifier U1 receives is V
out, the voltage V of the output terminal output of the first operational amplifier U1
1expression formula be
That is, when the resistance of the first peripheral circuit is determined, the voltage V of the output terminal output of the first operational amplifier U1
1the voltage V received with normal phase input end
outsize proportional, scale-up factor is determined by the first peripheral circuit.If need voltage amplification k times that receives the first operational amplifier U1 normal phase input end, then only need to ensure
, therefore, the choosing of resistance of the first resistance R1, the second resistance R2, the 3rd resistance R3 and the 4th resistance R4 has kinds of schemes.
By choosing the resistance of the first suitable resistance R1, the second resistance R2, the 3rd resistance R3 and the 4th resistance R4, can make, when the output voltage of eddy current displacement sensor and detecting distance linear time, the voltage V that the output terminal of the first operational amplifier U1 exports
1be less than the on state threshold voltage of diode D, therefore, diode D is in cut-off state, does not carry out voltage compensation; When the output voltage of eddy current displacement sensor becomes non-linear with detecting distance, the voltage V of the output terminal output of the first operational amplifier U1
1be greater than the on state threshold voltage of diode D, therefore, diode D is in conducting state, carries out voltage compensation, realizes linearity correction.
Alternatively, the first resistance R1 is identical with the resistance of the 3rd resistance R3, and the second resistance R2 is identical with the resistance of the 4th resistance R4.
Work as R
1=R
3and R
2=R
4time,
v
outbe reduced to
can clearly be seen that, work as V
outone timing, by regulating R
1and R
2size, suitable V can be obtained
1value.Such as, if need the voltage V that the output terminal making the first operational amplifier U1 exports
1the voltage V received with normal phase input end
outsize become 5 times of relations, when so choosing the first resistance R1 and the second resistance R2, meet R
2=5R
1.Again such as, if need the voltage V that the output terminal making the first operational amplifier U1 exports
1the voltage V that normal phase input end receives
out0.1 times of size, when so choosing the first resistance R1 and the second resistance R2, meet R
2=0.1R
1.
Alternatively, adding circuit 20 comprises the second operational amplifier U2 and the second peripheral circuit.The input end of the second operational amplifier U2 is connected with the negative electrode of diode D, and receives output voltage, and output terminal is used for output calibration voltage.Second peripheral circuit is connected with the second operational amplifier U2.
Alternatively, the second peripheral circuit comprises: the 5th resistance R5, the 6th resistance R6, the 7th resistance R7 and the 8th resistance R8.The first end of the 5th resistance R5 is for receiving output voltage, and the second end is connected with the normal phase input end of the second operational amplifier U2.6th resistance R6 is connected between the negative electrode of diode D and the normal phase input end of the second operational amplifier U2.7th resistance R7 is connected between the inverting input of signal ground and the second operational amplifier U2.8th resistance R8 is connected between the output terminal of the 4th node and the second operational amplifier U2, and wherein, the 4th node is the node between the inverting input of the 7th resistance R7 and the second operational amplifier U2.
The voltage that the positive input of the second operational amplifier U2 receives is V
out, the voltage that output terminal exports is V
out', V
out' with V
outbetween pass be
By choosing the suitable resistance of the 5th resistance R5, the 6th resistance R6, the 7th resistance R7 and the 8th resistance R8, export after the voltage amplification that the positive input of the second operational amplifier U2 can be received.If need the voltage amplification k to the positive input of the second operational amplifier U2 receives doubly to export, only need to ensure
, therefore, the voltage received when the positive input of the second operational amplifier U2 is V
outduring for definite value, having chosen of the resistance of the 5th resistance R5, the 6th resistance R6, the 7th resistance R7 and the 8th resistance R8 is multiple.
By choosing the resistance of the first suitable resistance R1, the second resistance R2, the 3rd resistance R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7 and the 8th resistance R8, can make, when the output voltage of eddy current displacement sensor and detecting distance linear time, the voltage V that the output terminal of the first operational amplifier U1 exports
1be less than the on state threshold voltage of diode D, therefore, diode D is in cut-off state, does not carry out voltage compensation; When the output voltage of eddy current displacement sensor becomes non-linear with detecting distance, the voltage V of the output terminal output of the first operational amplifier U1
1be greater than the on state threshold voltage of diode D, therefore, diode D is in conducting state, and adding circuit utilizes regulation voltage V
1come V
outcompensate, realize linearity correction, obtain correction voltage V
out'.
Alternatively, the 5th resistance R5 is identical with the resistance of the 7th resistance R7, and the 6th resistance R6 is identical with the resistance of the 8th resistance R8.
Work as R
5=R
7and R
6=R
8time,
Be reduced to
Alternatively, correcting circuit also comprises the 9th resistance R9.Between the negative electrode that 9th resistance R9 is connected to diode D and signal ground.
The embodiment of the present invention additionally provides a kind of eddy current displacement sensor, and this eddy current displacement sensor comprises the correcting circuit of any one eddy current displacement sensor that foregoing of the present invention provides.
The embodiment of the present invention additionally provides a kind of displacement detecting circuit, and this displacement detecting circuit comprises any one eddy current displacement sensor that foregoing of the present invention provides.
According to the embodiment of the present invention, additionally provide a kind of embodiment of bearing calibration of eddy current displacement sensor, the correcting circuit of any one eddy current displacement sensor that the bearing calibration of this eddy current displacement sensor can be provided by embodiment of the present invention foregoing performs, and is described below to the bearing calibration of the eddy current displacement sensor that the embodiment of the present invention provides.
Fig. 6 is the process flow diagram of the bearing calibration of eddy current displacement sensor according to the embodiment of the present invention.As shown in Figure 6, the method comprises the following steps:
S602, when the output voltage of eddy current displacement sensor is greater than predeterminated voltage, calculates the regulation voltage proportional with output voltage.
S604, utilizes regulation voltage to compensate output voltage, obtains the correction voltage of output voltage.
The output voltage of eddy current displacement sensor and detecting distance linear time, the output voltage of eddy current displacement sensor is less than predeterminated voltage, does not produce regulation voltage, does not carry out the compensation of voltage.When the output voltage of eddy current displacement sensor becomes nonlinear relationship with detecting distance, the output voltage of eddy current displacement sensor is greater than predeterminated voltage, produces regulation voltage, utilizes regulation voltage to carry out voltage compensation, realize linearity correction.This kind of correcting circuit only need produce associated adjustment voltage, building of circuit is fairly simple, reach reduction circuit cost, improve the technique effect of circuit stability, and then solve the technical matters of circuit structure complexity of correcting circuit of eddy current displacement sensor in prior art.
The invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.
In the above embodiment of the present invention, the description of each embodiment is all emphasized particularly on different fields, in certain embodiment, there is no the part described in detail, can see the associated description of other embodiments.
In several embodiments that the application provides, should be understood that, disclosed technology contents, the mode by other realizes.Wherein, device embodiment described above is only schematic, the such as division of described unit, can be that a kind of logic function divides, actual can have other dividing mode when realizing, such as multiple unit or assembly can in conjunction with or another system can be integrated into, or some features can be ignored, or do not perform.Another point, shown or discussed coupling each other or direct-coupling or communication connection can be by some interfaces, and the indirect coupling of unit or module or communication connection can be electrical or other form.
The described unit illustrated as separating component or can may not be and physically separates, and the parts as unit display can be or may not be physical location, namely can be positioned at a place, or also can be distributed on multiple unit.Some or all of unit wherein can be selected according to the actual needs to realize the object of the present embodiment scheme.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, also can be that the independent physics of unit exists, also can two or more unit in a unit integrated.Above-mentioned integrated unit both can adopt the form of hardware to realize, and the form of SFU software functional unit also can be adopted to realize.
If described integrated unit using the form of SFU software functional unit realize and as independently production marketing or use time, can be stored in a computer read/write memory medium.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words or all or part of of this technical scheme can embody with the form of software product, this computer software product is stored in a storage medium, comprises all or part of step of some instructions in order to make a computer equipment (can be personal computer, server or the network equipment etc.) perform method described in each embodiment of the present invention.And aforesaid storage medium comprises: USB flash disk, ROM (read-only memory) (ROM, Read-OnlyMemory), random access memory (RAM, RandomAccessMemory), portable hard drive, magnetic disc or CD etc. various can be program code stored medium.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (11)
1. a correcting circuit for eddy current displacement sensor, is characterized in that, comprising:
Produce circuit (10), input end is for receiving the output voltage of described eddy current displacement sensor, and output terminal is for exporting the regulation voltage proportional with described output voltage;
Diode (D), anode is connected with the output terminal of described generation circuit (10); And
Adding circuit (20), input end is connected with the negative electrode of described diode (D), and receives described output voltage, and output terminal is for exporting the correction voltage after compensating described output voltage.
2. correcting circuit according to claim 1, is characterized in that, described generation circuit (10) comprising:
First operational amplifier (U1), input end is for receiving described output voltage, and output terminal is connected with the anode of described diode (D); And
First peripheral circuit, is connected with described first operational amplifier (U1).
3. correcting circuit according to claim 2, is characterized in that, described first peripheral circuit comprises:
First resistance (R1), first end is for receiving described output voltage, and the second end is connected with the normal phase input end of described first operational amplifier (U1);
Second resistance (R2), is connected between first node and signal ground, and wherein, described first node is the node between the second end of described first resistance (R1) and the normal phase input end of described first operational amplifier (U1);
3rd resistance (R3), between the inverting input being connected to signal ground and described first operational amplifier (U1); And
4th resistance (R4), be connected between Section Point and the 3rd node, wherein, described Section Point is the node between described 3rd resistance (R3) and the inverting input of described first operational amplifier (U1), and described 3rd node is the node between the output terminal of described first operational amplifier (U1) and the anode of described diode (D).
4. correcting circuit according to claim 3, it is characterized in that, described first resistance (R1) is identical with the resistance of described 3rd resistance (R3), and described second resistance (R2) is identical with the resistance of described 4th resistance (R4).
5. correcting circuit according to any one of claim 1 to 4, is characterized in that, described adding circuit (20) comprising:
Second operational amplifier (U2), input end is connected with the negative electrode of described diode (D), and receives described output voltage, and output terminal is for exporting described correction voltage; And
Second peripheral circuit, is connected with described second operational amplifier (U2).
6. correcting circuit according to claim 5, is characterized in that, described second peripheral circuit comprises:
5th resistance (R5), first end is for receiving described output voltage, and the second end is connected with the normal phase input end of described second operational amplifier (U2);
6th resistance (R6), is connected between the negative electrode of described diode (D) and the normal phase input end of described second operational amplifier (U2);
7th resistance (R7), between the inverting input being connected to signal ground and described second operational amplifier (U2); And
8th resistance (R8), between the output terminal being connected to the 4th node and described second operational amplifier (U2), wherein, described 4th node is the node between described 7th resistance (R7) and the inverting input of described second operational amplifier (U2).
7. correcting circuit according to claim 6, it is characterized in that, described 5th resistance (R5) is identical with the resistance of described 7th resistance (R7), and described 6th resistance (R6) is identical with the resistance of described 8th resistance (R8).
8. correcting circuit according to claim 1, is characterized in that, described correcting circuit also comprises:
9th resistance (R9), between the negative electrode being connected to described diode (D) and signal ground.
9. an eddy current displacement sensor, is characterized in that, comprises the correcting circuit of the eddy current displacement sensor according to any one of claim 1 to 8.
10. a displacement detecting circuit, is characterized in that, comprises eddy current displacement sensor according to claim 9.
The bearing calibration of 11. 1 kinds of eddy current displacement sensors, is characterized in that, is corrected by the correcting circuit of the eddy current displacement sensor according to any one of claim 1 to 8, and described bearing calibration comprises:
When the output voltage of described eddy current displacement sensor is greater than predeterminated voltage, calculate the regulation voltage proportional with described output voltage; And
Utilize described regulation voltage to compensate described output voltage, obtain the correction voltage of described output voltage.
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| CN201510835181.4A CN105333808B (en) | 2015-11-25 | 2015-11-25 | Displacement detecting circuit, eddy current displacement sensor and its correcting circuit and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106225657A (en) * | 2016-08-12 | 2016-12-14 | 安徽容知日新科技股份有限公司 | Displacement transducer |
| CN107084659A (en) * | 2017-05-31 | 2017-08-22 | 北京航空航天大学 | A kind of high temperature follows the differential variable frequency AM electric vortex displacement sensor of grading compensation certainly |
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| CN107084659A (en) * | 2017-05-31 | 2017-08-22 | 北京航空航天大学 | A kind of high temperature follows the differential variable frequency AM electric vortex displacement sensor of grading compensation certainly |
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| Publication number | Publication date |
|---|---|
| CN105333808B (en) | 2018-12-07 |
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