CN202329529U - External excitation type eddy current displacement sensor excitation circuit - Google Patents
External excitation type eddy current displacement sensor excitation circuit Download PDFInfo
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- CN202329529U CN202329529U CN2011204726599U CN201120472659U CN202329529U CN 202329529 U CN202329529 U CN 202329529U CN 2011204726599 U CN2011204726599 U CN 2011204726599U CN 201120472659 U CN201120472659 U CN 201120472659U CN 202329529 U CN202329529 U CN 202329529U
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Abstract
The utility model provides an external excitation type eddy current displacement sensor excitation circuit, which comprises an input end and two power driving circuits forming a positive direction output end an negative direction output end. Two output ends of the driving circuits are in corresponding connection with two current limiting resistor (RC) blocking bleeder circuits, and the two bleeder circuits are respectively connected with two ends of a loop circuit (LC) parallel resonance circuit formed by a sensor detection coil. The external excitation type eddy current displacement sensor excitation circuit adopts a power driving chip, a positive direction square signal and a reverse direction square signal are generated at two output ends of the chip to form a positive differential signal and a negative differential signal, further differential excitation signals are generated at two ends of the LC parallel resonance circuit, and therefore the detection signals on the detection coil can be transmitted in stable and distortionless mode, and capacity for resisting outside environment interference is greatly improved.
Description
Technical field
The utility model relates to the sensing detection technical field, is specifically related to a kind of independent-excited eddy displacement sensor exciting circuit.
Background technology
Eddy displacement sensor can staticly be measured the distance of tested metallic conductor apart from detecting head surface with dynamically noncontact, high linearity, high resolution ground.Eddy displacement sensor can accurately be measured static and dynamic relative displacement variation between measured body (must be metallic conductor) and the probe end face, and it is a kind of non-contacting linearization metering outfit.Eddy displacement sensor is widely used in testing in the manufacturing, the Equipment Inspection of industrial basic research, precision equipment.At present, eddy displacement sensor is mainly used in the motion trace data of machinery that machinery and the reciprocating of high speed rotating are measured in research, and the research of vibration etc.Eddy displacement sensor particularly to non-contacting high precision vibration, displacement signal, can collect the multiple parameter of orbiting motions such as vibration, rotation continuously exactly in analysis to measure.Therefore, the sensing precision for eddy displacement sensor has very high requirement.
In to existing eddy displacement sensor research and practice process; The inventor of the utility model finds: there are many shortcomings in the transmittability for the tiny signal that senses in the existing eddy displacement sensor; Especially when target to be measured only produces micro-displacement; The sensor current signal that on inductive coil, produces also is relatively fainter; And existing eddy displacement sensor adopts the mode of self-excitation that induction current is returned to detection system more; In the process of transmission, can produce distorted signals unavoidably so, all can have the electromagnetic interference (EMI) of external environment in addition in front end coil induction process and in the transmission course of detection signal, therefore how avoiding external environment is the problem that prior art faces to the interference of detection signal and stable, the undistorted transmission of realization detection signal.
The utility model content
The utility model provides a kind of independent-excited eddy displacement sensor exciting circuit, can address the above problem.
The utility model provides a kind of independent-excited eddy displacement sensor exciting circuit; It is characterized in that: comprise having an input end and two power driving circuits that form forward and reverse output terminal; At the corresponding separated straight bleeder circuit of two-way RC that connects of two output terminals of driving circuit, said two-way bleeder circuit is connected respectively to the two ends of LC antiresonant circuit.
Preferably, the MIC4428 chip is selected on said driving peace road for use.
Preferably; Said driving circuit is composed in parallel by a voltage follower and an active phase inverter; The shared input end of said voltage follower and said active phase inverter, the output terminal of voltage follower and the output terminal of active phase inverter constitute two output terminals that formation is forward and reverse of driving circuit.
Preferably, said separated straight bleeder circuit is made up of resistance and capacitances in series.
Technique scheme can be found out; Because the utility model embodiment adopts active driving circuit; And two output terminals at chip produce forward and reverse square signal, form differential signal, and then produce the difference pumping signal at the two ends of LC antiresonant circuit; Make that so just detection signal on the magnetic test coil can be stablized, the distortionless transmission, the ability of opposing external environmental interference is increased dramatically.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiment of the utility model, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the circuit theory diagrams of independent-excited eddy displacement sensor exciting circuit among the utility model embodiment.
Embodiment
To combine the accompanying drawing among the utility model embodiment below, the technical scheme among the utility model embodiment is carried out clear, intactly description, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making all other embodiment that obtained under the creative work prerequisite, all belong to the scope of the utility model protection.
Embodiment:
The utility model embodiment provides a kind of independent-excited eddy displacement sensor exciting circuit; Comprise and have an input end and two power driving circuits that form forward and reverse output terminal; At the corresponding separated straight bleeder circuit of two-way that connects of two output terminals of driving circuit, said two-way dividing potential drop shape circuit is connected respectively to the two ends of the LC antiresonant circuit that is made up of the sensor coil.
Specifically as shown in Figure 1; Said driving circuit can directly substitute with MIC4428 chip U; MIC4428 chip U is that MOSFET drives output, and output resistance has only 6～10 Ω, and maximum output current can reach 1.5A; Maximum operation frequency can arrive 25MHz, inner integrated forward and reverse 2 out gates.It is understandable that; Said driving circuit also can be composed in parallel by a voltage follower and an active phase inverter; The shared input end of voltage follower and active phase inverter, the output terminal of voltage follower and the output terminal of active phase inverter constitute two output terminals that formation is forward and reverse of driving circuit.
Forming by resistance and capacitances in series among the utility model embodiment at a distance from straight bleeder circuit; Output pin 7 at the MIC4428 chip connects the bleeder circuit that is made up of resistance R 1 and capacitor C 1; Output pin 5 at the MIC4428 chip connects the bleeder circuit that is made up of resistance R 2 and capacitor C 2; And the two-way bleeder circuit is connected respectively to the two ends of the LC antiresonant circuit that is made up of sensor coil L1; Magnetic test coil L1 and oscillating capacitance C3 form resonant tank among the figure, and an end of bleeder circuit is connected the tie point place of magnetic test coil L1 and oscillating capacitance C3.
Below in conjunction with Fig. 1 the principle of work of the independent-excited eddy displacement sensor exciting circuit among the utility model embodiment is made specific descriptions.
The inside that the signal input of independent-excited can be derived from pick-up unit is perhaps with outside accurate signal source device; If but adopt outside accurate signal source device can make cost raise; Therefore the input signal for driving circuit is directly provided by pick-up unit itself in practical application; The general TTL square-wave signal that adopts has stable level state.The input end pin 3 of MIC4428 chip U and the pin 4 shared input end that connects together; Be input to the pin 3 of MIC4428 chip U when high level after, pass through inner phase inverter in chip pin 7 output low levels, simultaneously at chip internal; After high level is input to the pin 4 of MIC4428 chip U; At chip internal through inner voltage follower at chip pin 5 output high level, after the one-channel signal of chip U input end is through chip U, just formed differential signal opposite on the phase place this moment, differential signal further passes through resistance R 1 and resistance R 2 respectively; Because the signal of input end has certain frequency; Therefore the differential signal of square wave form can be through passing through capacitor C 1, capacitor C 2 respectively, and under the vibration environment of magnetic test coil L1 and oscillating capacitance C3 the formation sine wave signal, so; It is understandable that, just formed the difference pumping signal of sinusoidal wave form this moment at the two ends of magnetic test coil L1.
The utility model embodiment adopts active driving circuit; And two output terminals at chip produce forward and reverse waveform signal; Form differential signal; And then, making that so just the detection signal on the magnetic test coil can be stablized, the distortionless transmission in the two ends of LC antiresonant circuit generation difference pumping signal, the ability of opposing external environmental interference is increased dramatically.
More than independent-excited eddy displacement sensor exciting circuit that the utility model embodiment is provided carried out detailed introduction; Used concrete example among this paper the principle and the embodiment of the utility model are set forth, the explanation of above embodiment just is used to help to understand the method and the core concept thereof of the utility model; Simultaneously, for one of ordinary skill in the art, according to the thought of the utility model, the part that on embodiment and range of application, all can change, in sum, this description should not be construed as the restriction to the utility model.
Claims (5)
1. independent-excited eddy displacement sensor exciting circuit; It is characterized in that: comprise having an input end and two power driving circuits that form forward and reverse output terminal; At the corresponding separated straight bleeder circuit of two-way RC that connects of two output terminals of driving circuit, said two-way bleeder circuit is connected respectively to the two ends of the LC antiresonant circuit that is made up of the sensor coil.
2. a kind of independent-excited eddy displacement sensor exciting circuit as claimed in claim 1, it is characterized in that: said driving circuit is selected the MIC4428 chip for use.
3. a kind of independent-excited eddy displacement sensor exciting circuit as claimed in claim 1; It is characterized in that: said driving circuit is composed in parallel by a voltage follower and an active phase inverter; The shared input end of said voltage follower and said active phase inverter, the output terminal of voltage follower and the output terminal of active phase inverter constitute two forward and reverse output terminals of driving circuit.
4. a kind of independent-excited eddy displacement sensor exciting circuit as claimed in claim 1 is characterized in that: said separated straight bleeder circuit is made up of resistance and capacitances in series.
5. a kind of independent-excited eddy displacement sensor exciting circuit as claimed in claim 1, it is characterized in that: said LC antiresonant circuit is composed in parallel by sensor coil and electric capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204726599U CN202329529U (en) | 2011-11-23 | 2011-11-23 | External excitation type eddy current displacement sensor excitation circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204726599U CN202329529U (en) | 2011-11-23 | 2011-11-23 | External excitation type eddy current displacement sensor excitation circuit |
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| CN202329529U true CN202329529U (en) | 2012-07-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011204726599U Expired - Lifetime CN202329529U (en) | 2011-11-23 | 2011-11-23 | External excitation type eddy current displacement sensor excitation circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103512592A (en) * | 2013-09-27 | 2014-01-15 | 中国科学院电子学研究所 | Wireless passive LC resonance sensor detecting circuit and corresponding information acquiring method |
| CN113776426A (en) * | 2021-09-15 | 2021-12-10 | 连云港杰瑞电子有限公司 | Method for generating excitation signal of inductive sensor |
| CN115166838A (en) * | 2022-09-07 | 2022-10-11 | 浙江图维科技股份有限公司 | Method and system for positioning pipeline |
-
2011
- 2011-11-23 CN CN2011204726599U patent/CN202329529U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103512592A (en) * | 2013-09-27 | 2014-01-15 | 中国科学院电子学研究所 | Wireless passive LC resonance sensor detecting circuit and corresponding information acquiring method |
| CN103512592B (en) * | 2013-09-27 | 2016-01-20 | 中国科学院电子学研究所 | Wireless and passive LC resonant transducer testing circuit and corresponding information getting method |
| CN113776426A (en) * | 2021-09-15 | 2021-12-10 | 连云港杰瑞电子有限公司 | Method for generating excitation signal of inductive sensor |
| CN113776426B (en) * | 2021-09-15 | 2024-03-15 | 连云港杰瑞电子有限公司 | Excitation signal generation method of inductive sensor |
| CN115166838A (en) * | 2022-09-07 | 2022-10-11 | 浙江图维科技股份有限公司 | Method and system for positioning pipeline |
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| C14 | Grant of patent or utility model | ||
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Address after: 510630 east block, floor 3, building B, A3 self-made Industrial Park, yard 6, Yinglong Avenue, Tianhe Longdong, Guangzhou City, Guangdong Province Patentee after: GUANGZHOU JINGXIN INSTRUMENT ELECTRICAL APPLIANCE Co.,Ltd. Address before: 510630, Guangdong, Tianhe District, Guangzhou Longdong dragon road, No. 6 compound, A3 self Industrial Zone, workshop B, building on the third floor, East seat Patentee before: GUANGZHOU JINGXIN INSTRUMENT ELECTRICAL APPLIANCE Co.,Ltd. |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120711 |