CN1068194A - The phase-locked loop assay method and the instrument of oil quality - Google Patents
The phase-locked loop assay method and the instrument of oil quality Download PDFInfo
- Publication number
- CN1068194A CN1068194A CN 92105213 CN92105213A CN1068194A CN 1068194 A CN1068194 A CN 1068194A CN 92105213 CN92105213 CN 92105213 CN 92105213 A CN92105213 A CN 92105213A CN 1068194 A CN1068194 A CN 1068194A
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- frequency
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- phase
- phase detector
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- 238000003556 assay Methods 0.000 title description 4
- 238000000034 method Methods 0.000 claims abstract description 10
- 230000003044 adaptive effect Effects 0.000 claims abstract description 3
- 230000003534 oscillatory effect Effects 0.000 claims description 21
- 239000000523 sample Substances 0.000 claims description 11
- 239000013078 crystal Substances 0.000 claims description 7
- 239000003990 capacitor Substances 0.000 claims description 4
- 238000002955 isolation Methods 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 230000010355 oscillation Effects 0.000 claims 1
- 239000002344 surface layer Substances 0.000 claims 1
- 238000001514 detection method Methods 0.000 abstract description 6
- 230000035945 sensitivity Effects 0.000 abstract description 4
- 239000003921 oil Substances 0.000 description 26
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 229940037003 alum Drugs 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000008157 edible vegetable oil Substances 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
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- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The present invention relates to a kind of detection method and instrument of oil quality.The present invention is locked in oscillator on the standard frequency all the time with an adaptive phase-locked loop feedback circuit, the feedback signal of its phase-locked loop just can directly reflect the variation of tested oil quality, because the testing process of this instrument is to carry out under the large-signal of very high frequency(VHF) or ultrahigh frequency, so have stronger anti-interference and very high sensitivity, its flexibility ratio can reach 100,000/.Distance can be greater than more than the 2.5mm, so that the high viscosity oil product is detected between the capacitive transducer pole plate of this instrument.The circuit of this instrument can replace with integrated circuit and microcomputer, has advantages such as dependable performance.
Description
The present invention relates to the assay method and the instrument thereof of oil quality.
In the oil product use of a certain label, must be subjected to various pollutions, its quality is changed.As: dozer is exactly a kind of by hydraulicdriven machinery, its hydraulic oil not only is subjected to the pollution of dust, in also can the to-and-fro movement process owing to hydraulic mandril, peeling off and contaminated product of the broken end of metal be arranged constantly, the wearing and tearing of engineering machinery have been quickened in the pollution that above-mentioned reason produces oil product again.According to statistics, the damage of engineering machinery has 70% to be that impurity in the oil causes.And for example edible oil product is after frying repeatedly, and constituent contents such as the lead in the oil product, aluminium, alum constantly increase, even have arrived the stage that can not eat again.So oil product is carried out regular detection, can in a reasonable range, use with the oil product of guaranteeing a certain label, all be that positive meaning is arranged to commercial production, food processing.
The method and the instrument that adopt dielectric capacitance that the dielectric variation of oil product is tested at present mainly contain following several:
1, utilizes the bridge balance principle, directly capacitive reactance is tested with alternating current bridge.
2, adopt oily dielectric capacitor to form oscillatory circuit, again with the frequency departure of balanced type frequency discriminator after detecting off resonance on a L, the C resonant circuit, make it produce faint DC voltage component, the visible patent No. of concrete assay method is: the method and the instrument of CN 85107130 described test quality of lubrication oil.
Though above-mentioned two kinds of method principle differences all will adopt the direct current amplifier of high gain of small signal in circuit, be subject to disturb and the influence of amplifier zero point drift.In the second approach, owing to be subjected to the influence of balanced type frequency discriminator L, C resonant circuit Q value, its sensitivity is lower, and particularly distance can only be limit between 0.5～2.5mm between its capacitive transducer two-plate, and so little space is difficult for finishing detection for the big oil product of viscosity.
The object of the present invention is to provide a kind of oil product media variations to carry out the large-signal detection method and the instrument of very high frequency(VHF) or ultrahigh frequency, and then improve sensitivity, reliability and the practicality that oil product is detected capacitive sensor.
The object of the present invention is achieved like this: with a phase-locked loop oscillatory circuit at capacitive sensor place is finished adaptive FEEDBACK CONTROL, and accurately reflect the variation of oil quality with feedback control information.
Its method is as follows: the oscillator signal of above-mentioned oscillatory circuit is carried out N time frequency division earlier, and its frequency dividing ratio can be adjusted according to the dielectric parameter of different oil products; Utilize crystal reference oscillator output oscillating reference signal, this oscillating reference signal is carried out the phase demodulation frequency that R frequency division obtains a benchmark; Above-mentioned two signals through R, N frequency division carry out phase differential relatively through phase detector simultaneously; When putting into standard oil in the capacitive sensor,, make predetermined direct current of phase detector output lock magnitude of voltage with the method for adjusting N frequency dividing ratio; When putting into tested oil product in the capacitive sensor, change specific inductive capacity as its oil quality corresponding the variation also will be taken place, the oscillatory circuit frequency will be offset, phase detector can be exported the DC voltage of its phase changing capacity of reaction, this voltage is fed to the varactor in the above-mentioned oscillatory circuit, to offset the influence of its frequency shift (FS), it is locked on the standard frequency.The quality of oil product that the off-set value of this feedback voltage has been incited somebody to action direct correspondence.
Host circuit of the present invention comprises: capacitive sensor and oscillatory circuit, Fractional-N frequency device, crystal reference oscillator, R frequency divider, phase detector, low-pass filter, voltage table buffer circuit etc.
Specifically, above-mentioned oscillatory circuit comprises: capacitive character medium sensor, varactor, VHF oscillating integrated circuit etc.The sensor, become to become the LC loop that diode and inductance element constitute oscillatory circuit, oscillatory circuit connects the input end of Fractional-N frequency device by the isolation buffer circuit, and the Fractional-N frequency device is provided with adjusts the frequency dividing ratio button, an input end of Fractional-N frequency device output termination phase detector.Above-mentioned crystal reference oscillator links to each other with another input end of phase detector by the R frequency divider.The output terminal of phase detector connects the non-earth terminal of varactor among the L, C loop of above-mentioned oscillatory circuit by low-pass filter.
When a certain oil product is detected, at first test with standard oil, the frequency division of adjusting above-mentioned Fractional-N frequency device is the adjusting gear of voltmeter circuit when, the FEEDBACK CONTROL voltage that makes phase detector is a predetermined magnitude of voltage, adjust voltage table, the voltage table pointer is in position gone up, promptly allowed the voltage table pointer be positioned at the centre of watch face.Then probe is put into oil product to be measured, change as oil quality, the frequency of oscillatory circuit is offset, phase detector in the phase-locked loop will be exported a FEEDBACK CONTROL voltage, this voltage exerts an influence to varactor, makes it produce an inverse change amount, with the frequency lock of oscillatory circuit on the frequency of standard, measuring above-mentioned FEEDBACK CONTROL voltage value with voltage table, promptly is the variable quantity of oil quality.
Detection method of the present invention is to finish under the large-signal of very high frequency(VHF) or ultrahigh frequency, therefore has stronger anti-interference and higher sensitivity, method that the present invention is given and instrument to the measuring accuracy of oil quality can reach 100,000/, (reaching 0.05P/V), that is to say can the changing value of pickup in the 0.00025PF scope on 3 1/2 digital voltage tables.Distance is bigger between the given sensor plate of the present invention, thereby is convenient to the detection to some high viscosity oil products.
Description of drawings:
Fig. 1 is a principle of work block diagram of the present invention.
Fig. 2 is a circuit embodiments of the present invention.
Fig. 3 is sonde configuration figure of the present invention.
Fig. 4 is a host structure chart of the present invention.
Circuit embodiments of the present invention is seen Fig. 2, and wherein the IC-1 in the probe circuit is special-purpose VHF oscillating integrated circuit, C
XBe capacitive character medium sensor, C
2, D
1, C
6, C
5, L
1Constitute oscillatory circuit with IC-1.R
2Be phase-locked loop DC feedback resistance, C
1, C
4, C
7, R
1, L
2, C
9Be power filter element, C
8Be output coupling capacitor.The also available resolution element of above-mentioned VHF oscillating integrated circuit, promptly 3 oscillatory circuits and an isolation buffer amplifier are formed.
In the host circuit, IC-2 is special-purpose single-chip microcomputer, and it contains ROM, RAM, CPV, PLL, PD.The UP/Down button of special-purpose SCM peripheral is the Fractional-N frequency ratio that changes phase-locked loop (PLL); D
3, D
4, D
5For the IC-2 duty is selected external diode.R
2, R
3, R
4, C
4, BG
1, BG
2Be phase-locked loop low-pass filter, Q
1, C
6, C
7Constitute the clock of IC-2, and the reference crystal oscillator of phase-locked loop.B
2,
D1, D
2Constitute the power backup circuit (B of IC-2
2Be a lithium battery).BG
3, W
1, R
1, V
1Constitute the voltage table buffer circuit, C
1, C
2, C
3Be filter capacitor, 7805 is a three terminal regulator.B
1, K
1Be power supply and switch, R
5, D
6Light emitting diode constitutes the start indicator light circuit.
Sonde body structure of the present invention is seen Fig. 3, and sensor 4 is a dismountable cylindric electric capacity, and it is placed in probe end, is made up of plastic body structure and metal-plated rete.Shell 3 middle parts are provided with the element board 2 of probe circuit, and probe circuit links to each other with host circuit by a cable and plug 5.
In the host shell of the present invention host circuit is set, case panel structure is seen Fig. 4, and it comprises: test voltage table 6, pilot lamp 7, power switch 8, UP/DOwn button 9, trimmer potentiometer 10, battery cover 11, gang socket 12.
Claims (4)
1, a kind of employing dielectric capacitance changes oil quality and carries out method for measuring, it is characterized in that: the oscillatory circuit at capacitive sensor place is finished adaptive FEEDBACK CONTROL with a phase-locked loop, and reflect accurately that with feedback control information the variation of oil quality, concrete method are that oscillator signal with oscillatory circuit carries out frequency division N time; With a crystal oscillating reference signal, it is carried out the R frequency division, obtain the phase demodulation frequency of a benchmark; Above-mentioned two signals through N, R frequency division carry out phase demodulation, relatively its phase differential; When being standard oil in the capacitive sensor, adjust the Fractional-N frequency ratio, make the magnitude of voltage of a standard of phase detector output, when being tested oil product in the capacitive sensor, change as its quality, the frequency of oscillatory circuit can be offset, phase detector can be exported the DC voltage of its phase changing capacity of reaction, this Voltage Feedback is given the varactor in the above-mentioned oscillatory circuit, to offset the influence of its frequency shift (FS), it is locked on the standard frequency, and the control voltage of above-mentioned feedback can reflect accurately that the quality of tested oil product changes.
2, a kind of oil quality determining instrument, it comprises: probe circuit and host circuit two parts; Probe circuit is made up of oscillatory circuit and isolation buffer amplifier; Sensor in the above-mentioned oscillator is as dielectric capacitive means with oil product; It is characterized in that: host circuit comprises: Fractional-N frequency device, R frequency divider, phase detector, low-pass filter, crystal reference oscillator etc.; Host panel is provided with: the button 9 of test voltage table 6, adjustment Fractional-N frequency ratio, trimmer potentiometer 10, gang socket 12; Above-mentioned Fractional-N frequency device links to each other with phase detector one input end, above-mentioned crystal reference oscillator output termination R fraction frequency device input end, another input end of R frequency divider output termination phase detector, phase detector output links to each other by the non-earth terminal of a varactor in low-pass filter and probe circuit L, the C loop; Above-mentioned test voltage table 6 is measured the feedback voltage of above-mentioned phase detector output by the voltage table buffer circuit; Above-mentioned capacitive transducer 4 is the tubular plastic structure, its metal-coated surface layer, and it is placed in the end of probing shell 3, and is detachable; Be provided with oscillatory circuit, isolation buffer amplifier, varactor, phase-locked loop feedback resistance R in the probing shell 3
2With coupling capacitance C
8And circuit board 2, the signal output part 2 of probe circuit, feedback receiving end 3, power supply current supply circuit end 1,4 by cable and plug 5, host socket 12 with the Fractional-N frequency device input end 2 of main frame correspondence ', phase detector output terminal 3 ', power supply side 1 ', 4 ' link to each other; When a certain oil product is detected, earlier with the dielectric of standard oil as electric capacity, adjust the Fractional-N frequency ratio, the feedback voltage that makes phase detector is used the dielectric of tested oil product as capacitor again for being a standard value, changes as oil quality, phase detector just can be exported the feedback signal of reaction oscillation frequency drift, this signal adds to above-mentioned varactor, and the frequency of oscillatory circuit is locked on the primary standard frequency, this moment voltage table variable quantity, be exactly the relative variation of oil quality.
3, device as claimed in claim 1 is characterized in that the oscillator of above-mentioned probe circuit can be used the VHF oscillating integrated circuit; Circuit such as above-mentioned Fractional-N frequency device, RWV frequency divider, phase detector can constitute with a dedicated microcomputer that includes ROM, RAM, CPV, RLL, PD.
4, device as claimed in claim 1 is characterized in that behind varactor in the probe circuit and the capacitance series and at two ends, LC loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92105213 CN1024219C (en) | 1992-07-03 | 1992-07-03 | Phase-locked loop measuring method and instrument for oil product quality |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92105213 CN1024219C (en) | 1992-07-03 | 1992-07-03 | Phase-locked loop measuring method and instrument for oil product quality |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1068194A true CN1068194A (en) | 1993-01-20 |
| CN1024219C CN1024219C (en) | 1994-04-13 |
Family
ID=4941230
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92105213 Expired - Fee Related CN1024219C (en) | 1992-07-03 | 1992-07-03 | Phase-locked loop measuring method and instrument for oil product quality |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1024219C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6872298B2 (en) * | 2001-11-20 | 2005-03-29 | Lifescan, Inc. | Determination of sample volume adequacy in biosensor devices |
| CN108072685A (en) * | 2016-11-08 | 2018-05-25 | 东元电机股份有限公司 | Frying device for detecting concentration of total polar substances contained in oil products in real time |
-
1992
- 1992-07-03 CN CN 92105213 patent/CN1024219C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1024219C (en) | 1994-04-13 |
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