CN109696114A - Modulatedemodulate harmonic generation method, generator and the application in capacitive displacement detection - Google Patents
Modulatedemodulate harmonic generation method, generator and the application in capacitive displacement detection Download PDFInfo
- Publication number
- CN109696114A CN109696114A CN201910016975.6A CN201910016975A CN109696114A CN 109696114 A CN109696114 A CN 109696114A CN 201910016975 A CN201910016975 A CN 201910016975A CN 109696114 A CN109696114 A CN 109696114A
- Authority
- CN
- China
- Prior art keywords
- harmonic
- modulatedemodulate
- paths
- data selector
- modulating wave
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
- G01B7/023—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring distance between sensor and object
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
Abstract
The present invention provides a kind of modulatedemodulate harmonic generation method, generator and the application in capacitive displacement detection, wherein the method generates stable signal by frequency reference and controls the output of the two paths of data selector cyclic switching between voltage reference and ground, to obtain the modulating wave of frequency stabilization, amplitude stability, modulating wave obtains solution harmonic after phase shift operation.The present invention produces frequency stabilization and the modulating wave of amplitude stability conciliates harmonic, can be widely used in capacitive displacement sensing detection, and the noise of modulating wave reconciliation harmonic is effectively reduced.
Description
Technical field
The present invention relates to Technology of Precision Measurement fields, more particularly, to a kind of modulatedemodulate harmonic generation method, generator
And the application in capacitive displacement detection.
Background technique
Capacitive displacement detection technique is a kind of displacement detecting technology that high-precision is contactless, damage low with output impedance
The advantages that wasted work can be small, dynamic property is good, electrostatic attraction is small and high sensitivity has in field of precision measurement and widely answers
With.
Change in displacement is transformed into capacitance variations by capacitive displacement detection technique, and displacement is realized in the variation by measuring capacitor
Detection.In order to inhibit low frequency noises, generallys use modulation-demodulation technique and carry out capacitance detecting.Modulation technique be divided into amplitude modulation,
Frequency modulation and three kinds of phase modulation.Frequently with amplitude-modulating modulation technology in high-accuracy capacitor displacement detecting.Amplitude-modulating modulation technology is exactly by position
Shifting information load forms modulated signal on high frequency modulated wave amplitude and is transmitted, to inhibit low-frequency noise such as 1/fNoise
Interference.Demodulation is the inverse process of modulation, is to restore original displacement signal from the variation of the parameter of modulated signal.But modulating wave
The amplitude noise and phase noise of conciliating harmonic can all influence the precision of displacement detecting, therefore generation amplitude and frequency are highly stable
Modulating wave reconciliation harmonic it is extremely important.
Summary of the invention
The present invention is to solve the modulating wave reconciliation harmonic of the prior art due to influencing there are amplitude noise and phase noise
The technological deficiency of capacitive displacement detection accuracy provides a kind of amplitude and the highly stable modulatedemodulate harmonic generation method of frequency.
To realize the above goal of the invention, the technical solution adopted is that:
A kind of modulatedemodulate harmonic generation method generates stable signal by a frequency reference and controls two paths of data selector
Output cyclic switching between voltage reference and ground, to obtain the modulating wave of frequency stabilization, amplitude stability, modulating wave is by moving
Solution harmonic is obtained after mutually operating.
Preferably, the signal that the frequency reference generates is square-wave signal.
Meanwhile the present invention also provides a kind of modulatedemodulate harmonic generators comprising two paths of data selector and phase shifter,
The first input end of two paths of data selector is grounded, and the second input terminal of two paths of data selector accesses voltage reference, two numbers
It terminates according to the data selection of selector into frequency reference, the output of two paths of data selector terminates phase shifter；When specifically used,
Stable signal, which is generated, by frequency reference controls the output of the two paths of data selector cyclic switching between voltage reference and ground,
To obtain the modulating wave of frequency stabilization, amplitude stability, modulating wave obtains solution harmonic after phase shifter.
Preferably, the signal that the frequency reference generates is square-wave signal.
Meanwhile above-mentioned modulatedemodulate harmonic generation method, application of the modulatedemodulate harmonic generator in capacitive displacement detection
Within the scope of the present invention.
Compared with prior art, the beneficial effects of the present invention are:
Scheme provided by the invention generates stable signal by frequency reference and controls the output of two paths of data selector in voltage
Cyclic switching between benchmark and ground, to obtain the modulating wave of frequency stabilization, amplitude stability, modulating wave obtains after phase shift operation
To solution harmonic.The present invention produces frequency stabilization and the modulating wave of amplitude stability conciliates harmonic, can be widely used in capacitive displacement
In sensing detection, the noise of modulating wave reconciliation harmonic is effectively reduced.
Detailed description of the invention
Fig. 1 is the concrete structure schematic diagram of generator.
Specific embodiment
The attached figures are only used for illustrative purposes and cannot be understood as limitating the patent；
Below in conjunction with drawings and examples, the present invention is further elaborated.
Embodiment 1
As shown in Figure 1, modulatedemodulate harmonic generation method provided by the invention is based on a generator, the generator includes two
Circuit-switched data selector (MUX) and phase shifter, the first input end ground connection of two paths of data selector, the second of two paths of data selector
Input terminal accesses voltage reference, and the data selection of two paths of data selector is terminated into frequency reference, two paths of data selector it is defeated
Phase shifter is terminated out.Method provided by the invention generates stable signal by frequency reference and controls the defeated of two paths of data selector
The cyclic switching between voltage reference and ground out, to obtain the modulating wave of frequency stabilization, amplitude stabilityV p , modulating waveV p By
Solution harmonic is obtained after phase shift operation.
When modulatedemodulate harmonic generator provided by the invention is applied in capacitive displacement detection, two paths of data selector
Output end also needs to be sequentially connected differential capacitor, operational amplifier, demodulator and filter, and connects demodulator and phase shifter
It picks up and.When specifically used, the modulating wave of two paths of data selector output end successively passes through differential capacitor, operational amplifier
Difference processing, after enhanced processing, the solution harmonic in demodulator with phase shifter output is converged, and is carried out to modulating wave
Demodulation demodulates the signal come and is exported after the filtering processing of wave filter.
As a preferred embodiment, the signal that the frequency reference generates is square-wave signal in the present embodiment.
Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be pair
The restriction of embodiments of the present invention.For those of ordinary skill in the art, may be used also on the basis of the above description
To make other variations or changes in different ways.There is no necessity and possibility to exhaust all the enbodiments.It is all this
Made any modifications, equivalent replacements, and improvements etc., should be included in the claims in the present invention within the spirit and principle of invention
Protection scope within.
Claims (6)
1. a kind of modulatedemodulate harmonic generation method, it is characterised in that: generate stable signal control two by a frequency reference
The output of circuit-switched data selector cyclic switching between voltage reference and ground, to obtain the modulation of frequency stabilization, amplitude stability
Wave, modulating wave obtain solution harmonic after phase shift operation.
2. modulatedemodulate harmonic generation method according to claim 1, it is characterised in that: the signal that the frequency reference generates
For square-wave signal.
3. a kind of modulatedemodulate harmonic generator, it is characterised in that: including two paths of data selector and phase shifter, two paths of data selection
The first input end of device is grounded, and the second input terminal of two paths of data selector accesses voltage reference, the number of two paths of data selector
It terminates according to selection into frequency reference, the output of two paths of data selector terminates phase shifter；When specifically used, pass through frequency reference
The output of the stable signal control two paths of data selector cyclic switching between voltage reference and ground is generated, to obtain frequency
Stablize, the modulating wave of amplitude stability, modulating wave obtains solution harmonic after phase shifter.
4. modulatedemodulate harmonic generator according to claim 3, it is characterised in that: the signal that the frequency reference generates is
Square-wave signal.
5. application of any one of the claim 1 ~ 2 modulatedemodulate harmonic generation method in capacitive displacement detection.
6. application of any one of the claim 3 ~ 4 modulatedemodulate harmonic generator in capacitive displacement detection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910016975.6A CN109696114A (en) | 2019-01-08 | 2019-01-08 | Modulatedemodulate harmonic generation method, generator and the application in capacitive displacement detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910016975.6A CN109696114A (en) | 2019-01-08 | 2019-01-08 | Modulatedemodulate harmonic generation method, generator and the application in capacitive displacement detection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109696114A true CN109696114A (en) | 2019-04-30 |
Family
ID=66233184
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910016975.6A Pending CN109696114A (en) | 2019-01-08 | 2019-01-08 | Modulatedemodulate harmonic generation method, generator and the application in capacitive displacement detection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109696114A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4500984A (en) * | 1982-09-29 | 1985-02-19 | International Telecommunications Satellite Organization | Equalizer for reducing crosstalk between two FDM/FM carriers in a satellite communications system |
| CA2136886C (en) * | 1993-11-30 | 2007-07-10 | Mehrdad M. Moslehi | Apparatus, system and method for real-time wafer temperature measurement based on light scattering |
| CN101701970A (en) * | 2009-11-12 | 2010-05-05 | 北京航空航天大学 | Method for detecting acceleration and device thereof |
| CN101776973A (en) * | 2009-01-13 | 2010-07-14 | 义隆电子股份有限公司 | Control circuit and method of capacitance type touch control panel and capacitance type touch control panel module |
| CN102412773A (en) * | 2011-12-23 | 2012-04-11 | 东南大学 | Control circuit of switched reluctance motor with double chopped wave limits |
| CN103995150A (en) * | 2014-05-20 | 2014-08-20 | 华中科技大学 | Capacitance flexure accelerometer with adjustable scale factor |
| CN104902486A (en) * | 2006-12-29 | 2015-09-09 | 诺基亚公司 | Data transmission in mobile communication system |
-
2019
- 2019-01-08 CN CN201910016975.6A patent/CN109696114A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4500984A (en) * | 1982-09-29 | 1985-02-19 | International Telecommunications Satellite Organization | Equalizer for reducing crosstalk between two FDM/FM carriers in a satellite communications system |
| CA2136886C (en) * | 1993-11-30 | 2007-07-10 | Mehrdad M. Moslehi | Apparatus, system and method for real-time wafer temperature measurement based on light scattering |
| CN104902486A (en) * | 2006-12-29 | 2015-09-09 | 诺基亚公司 | Data transmission in mobile communication system |
| CN101776973A (en) * | 2009-01-13 | 2010-07-14 | 义隆电子股份有限公司 | Control circuit and method of capacitance type touch control panel and capacitance type touch control panel module |
| CN101701970A (en) * | 2009-11-12 | 2010-05-05 | 北京航空航天大学 | Method for detecting acceleration and device thereof |
| CN102412773A (en) * | 2011-12-23 | 2012-04-11 | 东南大学 | Control circuit of switched reluctance motor with double chopped wave limits |
| CN103995150A (en) * | 2014-05-20 | 2014-08-20 | 华中科技大学 | Capacitance flexure accelerometer with adjustable scale factor |
Non-Patent Citations (2)
| Title |
|---|
| 周海涛等: "单载波调制型加速度计差分电容检测电路", 《数据采集与处理》 * |
| 郑争兵: "基于FPGA 的FSK 调制解调系统设计", 《陕西理工学院学报( 自然科学版)》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105066857B (en) | Shaft position detection device and magnetic suspension motor | |
| KR100558379B1 (en) | Impedance-to-voltage converter | |
| US4451780A (en) | Non-contact type microdisplacement meter | |
| CN113030550B (en) | Non-contact voltage sensor | |
| CN111051820A (en) | Detection circuit, chip and detection system of bridge sensor | |
| CN101799610B (en) | Orthogonal demodulation device for heterodyne phase interference fiber sensor | |
| CN104062327A (en) | Capacitive sensor complementary stimulation and linear detection scheme for oil detection | |
| JPH08278336A (en) | Electrostatic sensor device | |
| CN109696114A (en) | Modulatedemodulate harmonic generation method, generator and the application in capacitive displacement detection | |
| CN106643455B (en) | A kind of condenser type rotation displacement transducer | |
| CN109917185A (en) | A kind of capacitance sensor and its working method and application based on resonance frequency measurement | |
| CN105004259B (en) | A kind of capacitive MEMS sensor detection circuit | |
| Rahal et al. | An ASIC front end for planar high-frequency contactless inductive position sensors | |
| RU2314544C1 (en) | Meter of parameters of dissipative cg- two terminal devices | |
| CN204944423U (en) | A kind of capacitive MEMS sensor detection circuit | |
| US20230161439A1 (en) | Quadrature calibration for sensor applications | |
| US11119138B1 (en) | Capacitive sensor including compensation for phase shift | |
| CN202329529U (en) | External excitation type eddy current displacement sensor excitation circuit | |
| CN208187334U (en) | A kind of capacitive displacement sensing device transmitted at a distance based on primary | |
| CN211085271U (en) | Detection circuit, chip and detection system of bridge sensor | |
| CN1750384A (en) | Signal demodulation circuit having operational amplifier with disable function | |
| CN208187335U (en) | A kind of capacitive displacement sensing device that transmission is isolated at a distance based on dual transformer | |
| CN209627352U (en) | A kind of pressure sensitivity push button signalling detection circuit and electronic equipment | |
| CN108759645A (en) | A kind of capacitive displacement sensing device transmitted at a distance based on transformer secondary output | |
| Aschenbrenner et al. | Contactless high frequency inductive position sensor with DSP read out electronics utilizing band-pass sampling |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190430 |