CN101339052B

CN101339052B - Sampling device for comparing amplitude and frequency variation difference

Info

Publication number: CN101339052B
Application number: CN2008101387891A
Authority: CN
Inventors: 谭慧勇; 郝振刚
Original assignee: Shandong Lichuang Science and Technology Co Ltd
Current assignee: Shandong Lichuang Science and Technology Co Ltd
Priority date: 2008-08-11
Filing date: 2008-08-11
Publication date: 2010-06-09
Anticipated expiration: 2028-08-11
Also published as: CN101339052A

Abstract

The invention discloses an amplitude and frequency variation difference comparative sampler, which is characterized in that the sampler consists of an oscillator 1, a loop L, capacitors C1 and C2, a reference circuit 3, a pull-up resistor R, an amplitude extraction circuit 2, a reference refresh circuit 4 and a comparator 5; wherein, the oscillator 1 is connected with the loop L which outputs electromagnetic wave; the oscillator 1 is coupled with the reference circuit 3 and the amplitude extraction circuit 2 by the capacitors C1 and C2; the pull-up resistor R is connected with the capacitor 2;the comparator 5 detects the detected signal; a trigger processes and outputs signal through a driving circuit; meanwhile, the refresh circuit 4 refreshes the reference. The sampler has the advantages of stable performance, good heat resistant performance and high accuracy, which is not restricted by environmental conditions and is widely used in the fields such as a plurality of intelligent meters, automatic instruments and particular working environments.

Description

Sampling device for comparing amplitude and frequency variation difference

Technical field

The invention belongs to electronic measuring technology field, particularly a kind of sampling device for comparing amplitude and frequency variation difference, this sampling thief is contactless sampling thief, and penetration performance is good, and power consumption is extremely low, and is influenced by ambient temperature little, and the degree of accuracy height is convenient to use.

Little power consumption figures displacement transducer of using the present invention's formation is mainly used in translation displacement or rotation displacement, translational velocity or the velocity of rotation of Measuring Object, can satisfy the measurement application requirements in the related field.

Little power consumption flow sensor of using the present invention's formation can be at big temperature difference environment, and operate as normal in the environment of the little power consumption condition of special requirement, the reliability height can directly apply to multiple intelligence instruments such as calorimeter, intellectual water meter, gas meter, fuel oil adding machine; Also can directly apply to the metering of refrigeration flow and the fuel oil adding machine in extremely frigid zones and big temperature difference area; Especially in the technical application facet of calorimeter, can solve for many years open question still well, crucial effect is played in metering for heating heat; Also can be applicable to fields such as instrument and meter for automation, robotization control and intelligent measure, have the value that important practical application and large tracts of land are promoted.

Use the novel sensor that the present invention constituted, except that being applicable to above multiple application, good especially first-selected device in the applied environment that requires little power consumption, high reliability especially.Potential and still undeveloped application is also very extensive, aspect the reduction power consumption of relevant instrument and meter, energy savings, have more a series of potential benefits and application prospect especially.

The present invention is easy to integrated, can use in the multiple sensors integrated circuit (IC) chip, and volume is little.

Background technology

At present, involved in the present invention to application in, apparatus structure complexity in respective field of application both at home and abroad, the cost height, portable, versatility is poor, power consumption is big.

Existing sampling apparatus mainly contains resistance-strain type, condenser type, inductance type, eddy current type, photo-electric, raster pattern, magnetic inductive etc.Resistance-strain type is to obtain signal by the STRESS VARIATION on the sampling device, and this mode is a contact; Condenser type in the suffered certain restriction of detection range, and is subject to the influence of external environment factor; Inductance type and whirlpool flow-type, power consumption is big; Photo-electric and raster pattern, power consumption is big, and does not have penetration capacity; Magnetic induction type very easily is subjected to the influence in magnetic field, and very easily adsorbs ferromagnetic material, easily demagnetization under the higher temperature environment.So said apparatus all can not satisfy the requirement under some particular job environment, for example, the requirement of aspects such as little power consumption, the anti-big temperature difference, pinpoint accuracy, high reliability, the present invention is exactly custom-designed in order to satisfy this a series of specific (special) requirements.

Summary of the invention

The object of the present invention is to provide a kind of working environment, overcome the limitation that original device exists, to measure the needs in using under meet the demands little power consumption, pin-point accuracy, the harsh environmental conditions at involved application.On sampling principle, the variation of oscillation amplitude and frequency with distinctive reference frame, compares the recognition technology that realizes pinpoint accuracy in the sample circuit that employing causes because of the variation of measured object displacement, to reach high performance index, satisfy the application requirements of some abominable workpiece environment.

For reaching above purpose, the technical solution adopted in the present invention is: this sampling device for comparing amplitude and frequency variation difference is characterized in that by oscillator, coil L, capacitor C ₁, C ₂, reference circuit, pull-up resistor, range signal extract circuit, benchmark refresh circuit, comparer and constitute, oscillator connecting coil L, and by coil L output electromagnetic wave, be used to survey measured object; Oscillator is by capacitor C ₁Be coupled on the reference circuit, by capacitor C ₂Being coupled to range signal extracts on the circuit; Reference circuit mainly is that the circuit by frequency inverted voltage constitutes, and realizes that frequency inverted becomes voltage, with this voltage as benchmark with extract the amplitude magnitude of voltage that circuit was detected by range signal and compare by comparer, obtain measuring-signal; Because the dc impedance of coil L is very little, when amplitude reduces, can change the current potential of electric capacity, constitutes simple differentiating circuit, strengthened the relatively degree of depth, to obtain true rotation situation; Pull-up resistor R and capacitor C ₂Be connected, constitute simple integrating circuit, this structure also has clocking capability, can when effective displacement not taking place, testee after the wait regular hour, be withdrawn into original state again, make output signal present electronegative potential, can reduce application apparatus and self because of being subjected to external interference, the probability of mistake receiving and transmitting signal, the reliability and stability to whole system are much improved in actual applications; When testee vibrates or presses axial float, the pace of change of amplitude is than much bigger under the normal condition, time of origin is extremely short, basically have little time to cause because of the frequency variation of moment, cause the variation of changing voltage (reference voltage), perhaps change minimumly, perhaps cancel out each other, the error code that causes for amplitude hit has good inhibition effect, thereby reduces the probability that error code takes place; Comparer detects measured signal, is handled and output signal by driving circuit by trigger, simultaneously, by the benchmark refresh circuit benchmark is refreshed, and changes the instantaneous value of voltage with the different frequencies constantly of accurate reflection; The threshold design that the present invention controls if having time, determines, current potential definition strictness between each functional block is to realize high-performance of the present invention and high-technology index.

Beneficial effect of the present invention is: owing to adopted frequency inverted is voltage, and compare the mode that obtains measuring-signal by comparer as the amplitude magnitude of voltage that benchmark and range signal extraction apparatus are detected with this voltage, so, have that stable performance, heat resistance are good, low in energy consumption, the advantage of long service life, and be not subjected to the restriction of environmental baseline, both can be widely used in the refrigeration metering and wait the low temperature field, also can be widely used in high temperature fields such as calorimeter; Owing to adopted the differentiating circuit of pull-up resistor R and coupling capacitance,, made it have pinpoint accuracy so avoided error code; Pull-up resistor R and capacitor C ₂Be connected, constitute simple integrating circuit, this structure also has clocking capability, can when effective displacement not taking place, testee after the wait regular hour, be withdrawn into original state again, make output signal present electronegative potential, can reduce application apparatus and self because of being subjected to external interference, the probability of mistake receiving and transmitting signal, the reliability and stability to whole system are much improved in actual applications.

Description of drawings

Fig. 1 is a schematic diagram of the present invention.

Fig. 2 is the schematic diagram of the embodiment of the invention 1.

Fig. 3 is the application apparatus figure of the embodiment of the invention 1.

Embodiment

Make the present invention with reference to accompanying drawing 1.This sampling device for comparing amplitude and frequency variation difference is characterized in that by oscillator 1, coil L, capacitor C ₁, C ₂, reference circuit 3, pull-up resistor R, range signal extract circuit 2, benchmark refresh circuit 4, comparer 5 and constitute, oscillator 1 connecting coil L, and by coil L output electromagnetic wave, be used to survey measured object; Oscillator 1 is by capacitor C ₁Be coupled on the reference circuit 3, by capacitor C ₂Being coupled to range signal extracts on the circuit 2; Reference circuit 3 mainly is that the circuit by frequency inverted voltage constitutes, and realizes that frequency inverted becomes voltage, compares by comparer 5 with extracted the amplitude magnitude of voltage that circuit 2 detected by range signal as benchmark with this voltage, obtains measuring-signal; Because the dc impedance of coil L is very little, when amplitude reduces, can change capacitor C ₁Current potential, constitute simple differentiating circuit, strengthened the relatively degree of depth, to obtain true rotation situation; Pull-up resistor R and capacitor C ₂Be connected, constitute simple integrating circuit; Comparer 5 detects measured signal, is handled and output signal by driving circuit by trigger, simultaneously, refreshes by 4 pairs of benchmark of benchmark refresh circuit; Trigger and driving circuit have description in Fig. 2, promptly 7 is trigger, and 9 is driving circuit, and among the figure, other are known technology, so seldom describe.

Embodiment 1

Fig. 2 has provided the schematic diagram of embodiment 1, and its annexation is: add power circuit 6 on schematic diagram of the present invention, the comparer 5 of principle of the invention figure is connected with trigger 7 with benchmark refresh circuit 4, is handled and output signal by driving circuit 9.Fig. 3 has provided three kinds of application apparatus figure of the embodiment of the invention 1, and 10 is testee among the figure, and 11 belong to sheet metal, and coil is L.

Claims

1. a sampling device for comparing amplitude and frequency variation difference is characterized in that by oscillator (1), coil L, capacitor C ₁, C ₂, reference circuit (3), pull-up resistor R, range signal extract circuit (2), benchmark refresh circuit (4), comparer (5) and constitute, oscillator (1) connecting coil L, and by coil L output electromagnetic wave; Oscillator (1) is by capacitor C ₁Be coupled on the reference circuit (3), by capacitor C ₂Being coupled to range signal extracts on the circuit (2); Reference circuit (3) is that the circuit by frequency inverted voltage constitutes, and realizes that frequency inverted becomes voltage, with this voltage as benchmark with extract the amplitude magnitude of voltage that circuit (2) detected by range signal and compare the acquisition measuring-signal by comparer (5); Pull-up resistor R and capacitor C ₂Be connected, constitute simple integrating circuit; Comparer (5) detects measured signal, is handled and output signal by driving circuit by trigger, simultaneously, by benchmark refresh circuit (4) benchmark is refreshed.