CN105277109A - Displacement sensor outputting digital frequencies - Google Patents
Displacement sensor outputting digital frequencies Download PDFInfo
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- CN105277109A CN105277109A CN201510557424.2A CN201510557424A CN105277109A CN 105277109 A CN105277109 A CN 105277109A CN 201510557424 A CN201510557424 A CN 201510557424A CN 105277109 A CN105277109 A CN 105277109A
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- detecting coil
- displacement transducer
- oscillator
- crystal resonator
- quartz
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Abstract
The invention discloses a displacement sensor outputting digital frequencies. The displacement sensor comprises a detecting coil, a quartz crystal resonator and an oscillator. The detecting coil, the quartz crystal resonator and the oscillator form a serial loop, wherein the output frequency of the displacement sensor outputting the digital frequencies is determined by a relative displacement between the detecting coil and a detected object. The sensor is good in stability, simple in structure, high in sensitivity and capable of realizing digital frequency output.
Description
Technical field
The invention belongs to displacement transducer technology field, be specifically related to the design of the displacement transducer that a kind of numerical frequency exports.
Background technology
Displacement transducer is widely used in various field, mainly comprises resistance-strain chip, raster pattern, condenser type, inductance type etc.Resistance-strain chip displacement sensor scope is 0.1 ~ 100 μm, is only applicable to the accurate measurement of small scope; Grating displacement transducer test specification is large, and resolution is high, but equipment complexity is not portable, and optical signalling not easily Storage and Processing; Capacitive displacement transducer cost is low, low in energy consumption, but its poor anti jamming capability, easily affected by environment.And the sensor of these forms to export be analog mostly, directly can not be connected with digital display circuit, therefore, develop and the displacement transducer of direct output digit signals can just become more and more important.
As patent CN104776791A proposes a kind of displacement transducer that can export digital fre-quency signal, this displacement transducer comprises displacement body, LC resonant circuit and resonance detection module.Wherein, displacement body described in this displacement transducer is through the telefault of described LC resonant circuit, the telefault of described LC resonant circuit moves along the central axis of described displacement body, cause the telefault inductance value of described LC resonant circuit to change, thus the frequency of described LC resonant circuit is changed thereupon.This displacement transducer has numerical frequency and exports and the simple advantage of structure, but the quality factor of LC resonant circuit generally can only reach hundreds of magnitude, and the stability of signal is not ideal enough.
Therefore, develop structure simple and there is good stability, numeral exports, displacement transducer that is highly sensitive, that detect displacement large is of great significance.
Summary of the invention
The object of the invention is to solve displacement transducer in prior art is analog mostly, the problem that can not directly be connected with digital display circuit, proposes the displacement transducer that a kind of numerical frequency exports.
Technical scheme of the present invention is: the displacement transducer that a kind of numerical frequency exports, and comprises detecting coil, quartz-crystal resonator and oscillator, and described detecting coil, quartz-crystal resonator and oscillator form series loop.
Preferably, detecting coil is PCB printed coil.
Preferably, detecting coil comprises pcb board and is made in the printed coil on pcb board.
Preferably, detecting coil is solenoid type detecting coil.
Preferably, the inductance value of detecting coil is less than 100 microhenrys.
Preferably, quartz-crystal resonator is Metal Packaging form.
Preferably, the nominal frequency of quartz-crystal resonator is 5-20MHz.
Preferably, oscillator is Pierce oscillator or phase locked loop oscillator.
The invention has the beneficial effects as follows: what the present invention's utilization was formed by detecting coil and quartz-crystal resonator is connected in series the feature with high quality factor, effectively improves the stable output signal of displacement transducer; The present invention can use in such as rugged surroundings such as humidity, dust, greasy dirt; The present invention also has large sense and frequency pulling draws rate, numerical frequency output, and subsequent detection circuit is simple, and digital signal can directly access in digital display circuit, is conducive to the transducing signal acquisition and processing in later stage; The present invention, compared with existing sensor, has structure simple, easy to make, achieves that good stability, antijamming capability are strong, the displacement measurement of sensitivity advantages of higher.
Accompanying drawing explanation
Fig. 1 is the displacement sensor circuit structural drawing that a kind of numerical frequency provided by the invention exports.
Fig. 2 is embodiment of the present invention detecting coil side view.
Fig. 3 is embodiment of the present invention detecting coil vertical view.
Fig. 4 is the equivalent-circuit model figure of embodiment of the present invention detecting coil and quartz-crystal resonator part in series.
Description of reference numerals: 1-detecting coil, 2-quartz-crystal resonator, 3-measurand, 4-oscillator, 11-pcb board, 12-printed coil.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are further described.
The invention provides the displacement transducer that a kind of numerical frequency exports, as shown in Figure 1, comprise detecting coil 1, quartz-crystal resonator 2 and oscillator 4, detecting coil 1, quartz-crystal resonator 2 and oscillator 4 form series loop.
Wherein, detecting coil 1 adopts PCB printed coil or solenoid type detecting coil etc.In the embodiment of the present invention, detecting coil 1 is PCB printed coil, as shown in Figures 2 and 3, and the printed coil 12 comprising pcb board 11 and make thereon.
The inductance value of detecting coil 1 is less than 100 microhenrys.In the embodiment of the present invention, the inductance value of detecting coil 1 is 14 microhenrys.
Quartz-crystal resonator 2 adopts Metal Packaging, and its nominal frequency is 5-20MHz.In the embodiment of the present invention, the nominal frequency of quartz-crystal resonator 2 is 10MHz.
Oscillator 4 adopts the oscillator of the type such as Pierce oscillator or phase locked loop oscillator.
As shown in Figure 4, according to this equivalent-circuit model, the sense frequency characteristic expression formula can deriving the displacement transducer that this numerical frequency exports is the equivalent-circuit model of detecting coil 1 and quartz-crystal resonator 2 part in series:
Wherein,
l, C represent inertial mass and the mechanical elasticity of quartz crystal respectively, C
0represent the direct capacitance of quartz-crystal resonator 2 electrode connection, L
xfor the inductance value of detecting coil 1.From formula (1), the inductance L of detecting coil 1
xchange can cause the output frequency f of this displacement transducer to change.
When the present invention works, as shown in Figure 2, detecting coil 1 placement parallel with measurand 3, and on direction of motion x, adjust the relative shift between measurand 3 and detecting coil 1.Measurand 3 is metallic conductor, and in the embodiment of the present invention, measurand 3 is a copper sheet.The output frequency of the displacement transducer that numerical frequency exports is determined by the relative displacement between detecting coil 1 and measurand 3.
Those of ordinary skill in the art will appreciate that, embodiment described here is to help reader understanding's principle of the present invention, should be understood to that protection scope of the present invention is not limited to so special statement and embodiment.Those of ordinary skill in the art can make various other various concrete distortion and combination of not departing from essence of the present invention according to these technology enlightenment disclosed by the invention, and these distortion and combination are still in protection scope of the present invention.
Claims (8)
1. the displacement transducer of a numerical frequency output, it is characterized in that, comprise detecting coil (1), quartz-crystal resonator (2) and oscillator (4), described detecting coil (1), quartz-crystal resonator (2) and oscillator (4) form series loop.
2. the displacement transducer of numerical frequency output according to claim 1, it is characterized in that, described detecting coil (1) is PCB printed coil.
3. the displacement transducer of numerical frequency output according to claim 2, it is characterized in that, described detecting coil (1) comprises pcb board (11) and is made in the printed coil (12) on pcb board (11).
4. the displacement transducer of numerical frequency output according to claim 1, it is characterized in that, described detecting coil (1) is solenoid type detecting coil.
5., according to the displacement transducer that the arbitrary described numerical frequency of claim 1-4 exports, it is characterized in that, the inductance value of described detecting coil (1) is less than 100 microhenrys.
6. the displacement transducer of numerical frequency output according to claim 1, it is characterized in that, described quartz-crystal resonator (2) is Metal Packaging form.
7. the displacement transducer of numerical frequency output according to claim 6, it is characterized in that, the nominal frequency of described quartz-crystal resonator (2) is 5-20MHz.
8. the displacement transducer of numerical frequency output according to claim 1, it is characterized in that, described oscillator (4) is Pierce oscillator or phase locked loop oscillator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510557424.2A CN105277109B (en) | 2015-09-02 | 2015-09-02 | Displacement sensor outputting digital frequencies |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510557424.2A CN105277109B (en) | 2015-09-02 | 2015-09-02 | Displacement sensor outputting digital frequencies |
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| CN105277109A true CN105277109A (en) | 2016-01-27 |
| CN105277109B CN105277109B (en) | 2017-01-25 |
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| CN201510557424.2A Active CN105277109B (en) | 2015-09-02 | 2015-09-02 | Displacement sensor outputting digital frequencies |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108896623A (en) * | 2018-07-11 | 2018-11-27 | 西南交通大学 | It is a kind of for measuring the numerical frequency formula humidity sensor of gas relative humidity |
| CN111307886A (en) * | 2020-03-06 | 2020-06-19 | 西南交通大学 | Digital frequency type humidity sensor |
| CN111342804A (en) * | 2020-03-06 | 2020-06-26 | 西南交通大学 | Frequency modulation circuit of quartz crystal oscillator |
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| CN85102388A (en) * | 1985-04-10 | 1986-04-10 | 陕西机械学院 | The eddy current mode displacement transducer of high precision and high sensitivity |
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2015
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| CN85102388A (en) * | 1985-04-10 | 1986-04-10 | 陕西机械学院 | The eddy current mode displacement transducer of high precision and high sensitivity |
| CN2043341U (en) * | 1988-12-15 | 1989-08-23 | 中国科学技术大学 | Microdisplacement transducer |
| JPH04184983A (en) * | 1990-11-20 | 1992-07-01 | Agency Of Ind Science & Technol | Magnetic coupling type superconducting quantum interference device |
| CN101479561A (en) * | 2006-06-23 | 2009-07-08 | Skf公司 | Vibration and condition monitoring system and the parts thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108896623A (en) * | 2018-07-11 | 2018-11-27 | 西南交通大学 | It is a kind of for measuring the numerical frequency formula humidity sensor of gas relative humidity |
| CN108896623B (en) * | 2018-07-11 | 2020-01-31 | 西南交通大学 | digital frequency type humidity sensor for measuring relative humidity of gas |
| CN111307886A (en) * | 2020-03-06 | 2020-06-19 | 西南交通大学 | Digital frequency type humidity sensor |
| CN111342804A (en) * | 2020-03-06 | 2020-06-26 | 西南交通大学 | Frequency modulation circuit of quartz crystal oscillator |
| CN111342804B (en) * | 2020-03-06 | 2022-02-25 | 西南交通大学 | Frequency modulation circuit of quartz crystal oscillator |
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| Publication number | Publication date |
|---|---|
| CN105277109B (en) | 2017-01-25 |
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