CN103808769A - Fringing electric field sensor measurement system - Google Patents
Fringing electric field sensor measurement system Download PDFInfo
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- CN103808769A CN103808769A CN201210438077.8A CN201210438077A CN103808769A CN 103808769 A CN103808769 A CN 103808769A CN 201210438077 A CN201210438077 A CN 201210438077A CN 103808769 A CN103808769 A CN 103808769A
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Abstract
The invention belongs to the technical field of measurement system, and particularly relates to a fringing electric field sensor measurement system. The invention provides the fringing electric field sensor measurement system with strong interference resistance and high low-frequency measuring precision. The fringing electric field sensor measurement system comprises a demo board, a power supply circuit, a power supply circuit LCD, a button, a sampling circuit, a DDS, a conditioning circuit, a driving circuit and a sensor. The measurement system has structural key points that the demo board is connected with the power supply circuit, the power supply circuit LCD, the button, the sampling circuit and the DDS; the DDS, the driving circuit, the sensor, the conditioning circuit and the sampling circuit are connected successively; and the driving circuit is connected with the sampling circuit.
Description
Technical field
the invention belongs to measuring system technical field, relate in particular to a kind of fringing field sensor device measuring system.
Background technology
capacitive transducer is widely used in industrial process control, can obtain other required physical quantitys, as specific inductive capacity, water percentage, displacement etc. by measuring capacitance or change situation.Fringe field (FringingElectric Field, being called for short FEF) sensor belongs to capacitance type sensor, but it is different from common parallel plate electrode capacitive transducer, the electrode of fringing field sensor device is in same plane, monolaterally penetrate owing to having, signal intensity is adjustable and unique advantage such as tomography, more and more for the non-cpntact measurement of sample physical characteristics.Massachusetts Institute of Technology (MIT) is studied the application of FEF sensor the earliest, develop the test macro for measuring transformer Water in oil amount, use signal generator to produce frequency sweep sinusoidal drive signals, make signal conditioning circuit sensor output AC signal is carried out to Hyblid Buffer Amplifier, and using the amplitude of host computer to sensor output AC voltage signal and phase calculation obtains sensor interelectrode capacity and electricity is led, the characteristic of sample is determined in the variation of leading by sensor interelectrode capacity and electricity.In the Zelanian Massey use FEF of university sensor marine product, toxic chemical substance is measured, provide driving signal by signal generator, use mimic channel that the AC signal of sensor output is converted to direct current signal, utilize its range value of single chip computer measurement, and set up the relation between DC voltage and sample properties by master sample.University of Washington is used FEF sensor to measure paper pulp water cut in paper-making process, adopts electric impedance analyzer analyte sensors output signal.In recent years, FEF sensor has also attracted the notice of more and more domestic scholars.The application of FEF sensor in material damage is surveyed studied by Southwest Jiaotong University, makes the sensor of 4 kinds of wavelength, uses LCR instrument to carry out experiments of measuring to sample.Xian Electronics Science and Technology University by FEF sensor application in vehicle windscreen wipers automatic control system, use the capacitance of electric impedance analyzer survey sensor, realizing extraneous rainfall measures, Harbin University of Science and Technology utilizes the portable water ratio of building enclosure measuring system of FEF sensor, based on charge-discharge principle designing measuring circuit, but owing to adopting direct current to amplify, can have larger drift, and the intrinsic stray capacitance of cmos switch in circuit can affect measuring accuracy.Although commercially available electric impedance analyzer medium-high frequency precision is high, antijamming capability is good, and its price is high, use inconvenience, and low frequency measurement effect is also unsatisfactory.
Summary of the invention
the present invention is exactly for the problems referred to above, and a kind of anti-interference strong, fringing field sensor device measuring system that low frequency measurement precision is high is provided.
to achieve these goals, the present invention adopts following technical scheme, the present invention includes development board, power circuit, power circuit LCD, button, sample circuit, DDS, modulate circuit, driving circuit, sensor, its structural feature development board is connected with power circuit, power circuit LCD, button, sample circuit, DDS respectively, DDS, driving circuit, sensor, modulate circuit, sample circuit are connected successively, and driving circuit is connected with sample circuit.
as a kind of preferred version, development board of the present invention adopts 28335eZdsp development board.
as another kind of preferred version, sample circuit of the present invention adopts ADC sample circuit.
beneficial effect of the present invention.
the present invention is based on anti-interference strong, the sensor measuring system that low frequency measurement precision is high of development board, complete the design of the hardware modules such as system modulate circuit, driving circuit, synchronous data sampling, power management, man-machine interface, realize functions such as driving signal generation, sensor signal synchronous acquisition and pre-service, sweep measurement, for the Software for Design of system provides good platform.
Accompanying drawing explanation
in order to make technical matters solved by the invention, technical scheme and beneficial effect clearer, below in conjunction with the drawings and the specific embodiments, the present invention is further elaborated.Should be appreciated that embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
fig. 1 is schematic block circuit diagram of the present invention.
Embodiment
as shown in the figure, the present invention includes development board, power circuit, power circuit LCD, button, sample circuit, DDS, modulate circuit, driving circuit, sensor, development board is connected with power circuit, power circuit LCD, button, sample circuit, DDS respectively, DDS, driving circuit, sensor, modulate circuit, sample circuit are connected successively, and driving circuit is connected with sample circuit.
described development board adopts 28335eZdsp development board.
described sample circuit adopts ADC sample circuit.
when fringe field (FEF) sensor measurement, need on sensor drive electrode, apply the sine wave drive signal of certain amplitude and frequency, and obtain output signal on the induction electrode of sensor.Measuring system mainly comprises driving circuit, signal conditioning circuit, sample circuit, man-machine interface circuit etc.Controlling and processing core is 28335eZdsp development board, on development board, dsp chip control DDS chip produces frequency sweep drive sensor, sensor output signal is through modulate circuit pre-service, by sample circuit sample and by result be transferred to dsp chip carry out analytical calculation 28335eZdsp development board integrated the SRAM storage of the minimum system of TMS320F28335DSP, the outer 256k of sheet, serial communication, JTAG debugging interface etc.28335 dsp chips are computing and control cores of system, and this chip is 32 real-time CPU, supports floating-point operation, Resources on Chip to enrich.Measuring system has been used SPI interface, GPIO interface, the outside parallel bus interface of dsp chip, and development board SCI communication module, JTAG communication module, extends out storage chip.
be understandable that, above about specific descriptions of the present invention, only for being described, the present invention is not limited to the described technical scheme of the embodiment of the present invention, those of ordinary skill in the art is to be understood that, still can modify or be equal to replacement the present invention, to reach identical technique effect; Use needs as long as meet, all within protection scope of the present invention.
Claims (3)
1. fringing field sensor device measuring system, comprise development board, power circuit, power circuit LCD, button, sample circuit, DDS, modulate circuit, driving circuit, sensor, it is characterized in that development board is connected with power circuit, power circuit LCD, button, sample circuit, DDS respectively, DDS, driving circuit, sensor, modulate circuit, sample circuit are connected successively, and driving circuit is connected with sample circuit.
2. fringing field sensor device measuring system according to claim 1, is characterized in that described development board adopts 28335eZdsp development board.
3. fringing field sensor device measuring system according to claim 1, is characterized in that described sample circuit adopts ADC sample circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210438077.8A CN103808769A (en) | 2012-11-06 | 2012-11-06 | Fringing electric field sensor measurement system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210438077.8A CN103808769A (en) | 2012-11-06 | 2012-11-06 | Fringing electric field sensor measurement system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103808769A true CN103808769A (en) | 2014-05-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210438077.8A Pending CN103808769A (en) | 2012-11-06 | 2012-11-06 | Fringing electric field sensor measurement system |
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| CN (1) | CN103808769A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111307885A (en) * | 2018-12-11 | 2020-06-19 | 上海微现检测设备有限公司 | Water-injected meat rapid detection method, detection system and detection device |
| CN114778921A (en) * | 2022-04-25 | 2022-07-22 | 河北工业大学 | Power module switch voltage measurement method based on fringe electric field |
-
2012
- 2012-11-06 CN CN201210438077.8A patent/CN103808769A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111307885A (en) * | 2018-12-11 | 2020-06-19 | 上海微现检测设备有限公司 | Water-injected meat rapid detection method, detection system and detection device |
| CN114778921A (en) * | 2022-04-25 | 2022-07-22 | 河北工业大学 | Power module switch voltage measurement method based on fringe electric field |
| CN114778921B (en) * | 2022-04-25 | 2024-06-18 | 河北工业大学 | Power module switching voltage measurement method based on fringe electric field |
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Application publication date: 20140521 |