CN105572206A - High-precision trace moisture measuring instrument detection circuit - Google Patents
High-precision trace moisture measuring instrument detection circuit Download PDFInfo
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- CN105572206A CN105572206A CN201610036246.3A CN201610036246A CN105572206A CN 105572206 A CN105572206 A CN 105572206A CN 201610036246 A CN201610036246 A CN 201610036246A CN 105572206 A CN105572206 A CN 105572206A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
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Abstract
The invention discloses a high-precision trace moisture measuring instrument detection circuit, and belongs to the technical field of measurement. The high-precision trace moisture measuring instrument detection circuit comprises a first circuit and a second circuit and is characterized in that the first circuit is connected with the input end of a photoelectric coupler, the second circuit is connected with the output end of the photoelectric coupler, and a power source of the first circuit and a power source of the second circuit are independent from each other; a symmetric wave generator in the first circuit is connected with a positive electrode of a detection electrode through a current-limiting resistor, and a negative electrode of the detection electrode is connected with a negative electrode of the power source of the first circuit; a positive electrode of the detection electrode provides an input signal for a detector, and the detector drives the input end of the photoelectric coupler. The detection circuit completely divides the first circuit and the second circuit, a state change reaction of an electrolyte is performed in the first circuit, the influence of the second circuit on the first circuit is avoided, and therefore the precision of a measuring instrument is improved; the symmetric wave generator obtains detection signals through linear voltage division, so that the measuring instrument conducts continuous and repeated measurement.
Description
Technical field
The invention belongs to field of measuring technique, be specifically related to a kind of high precision micro drimeter testing circuit.
Background technology
Drimeter as measuring the key instrument of moisture, have capacitive, drying type a, infrared-type with Ka Er-Fei Xiushi, be the constant moisture measuring a certain material substantially, the demand of measurement micro-moisture can not be met.For this reason, Chinese patent 200420053196.2 discloses a kind of micro-water analyzer, sine-wave power is mainly added on the primary coil of the first transformer by its testing circuit, the secondary coil of the first transformer by current-limiting resistance for two detecting electrodes provide working power, voltage between two detecting electrodes changes along with the change of electrolytic solution state, the voltage of this change is detected by the second transformer, is then sent to subsequent conditioning circuit and carries out signal transacting.This kind of analyzer is once prevailing, is widely used in all trades and professions, for the moisture controlled in product has made tremendous contribution.
Along with the development of science and technology, the product in many fields is to the requirement increasingly stringent of moisture.The accuracy of detection of said determination instrument can only reach 100 microgram ± 3 ~ 5 micrograms, namely in electrolytic cell, adds 100 microgram water, and the testing result of analyzer, can not the legitimate reading of accurate reaction water between 95 ~ 105 micrograms, and degree of accuracy is inadequate; And when detecting continuously, also affect measurement result, repeatability is bad.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of high precision micro drimeter testing circuit, can improve the accuracy of detection of measuring instrument.
For solving the problems of the technologies described above, technical scheme of the present invention is: invent a kind of high precision micro drimeter testing circuit, comprise the first circuit and second circuit, it is characterized in that: the first circuit and second circuit are separated by photoelectrical coupler, first circuit is connected with the input end of photoelectrical coupler, second circuit is connected with the output terminal of photoelectrical coupler, and the power supply of the first circuit and the power supply of second circuit are independent mutually;
First circuit comprises symmetrical wave generator, detecting electrode and wave detector, and symmetrical wave generator connects the positive pole of detecting electrode by current-limiting resistance, and the negative pole of detecting electrode connects the power cathode of the first circuit; The just very wave detector of detecting electrode provides input signal, and wave detector drives the input end of photoelectrical coupler.
Preferably, the first amplifier is added between described wave detector and photoelectrical coupler.
Preferably, described symmetrical wave generator is sine-wave generator or square-wave generator
Preferably, the frequency of described symmetrical wave generator is 20 ~ 50Hz, and amplitude is 7 ~ 10V.
Preferably, described second circuit is provided with wave filter, and wave filter connects the output terminal of photoelectrical coupler.
Preferably, the second amplifier is added between described wave filter and photoelectrical coupler.
Compared with prior art, the invention has the beneficial effects as follows:
1, because the first circuit is connected with the input end of photoelectrical coupler, second circuit is connected with the output terminal of photoelectrical coupler, the power supply of the first circuit and the power supply of second circuit are independent mutually, first circuit and second circuit complete parttion are come, and the state reacting condition of electrolytic solution is in the first circuit, avoid the impact of second circuit on the first circuit, thus improve the precision of measuring instrument; Symmetrical wave generator obtains detection signal by linear dividing potential drop, makes measuring instrument can duplicate measurements continuously.
2, the output signal of wave detector is amplified by the first amplifier, makes the signal after being exaggerated can drive photoelectrical coupler better, improves the precision of measuring instrument further.
3, because the frequency of symmetrical wave generator is 20 ~ 50Hz, amplitude is 7 ~ 10V, can improve the resolution of photoelectrical coupler to signal wave, is conducive to the precision improving measuring instrument further.
4, the present invention can improve the accuracy of detection of measuring instrument, and can carry out continuous repetition measurement, is convenient to apply in the industry higher to water cut requirement.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present invention.
Reference numeral is: 1, sine-wave generator; 2, wave detector; 3, the first amplifier; 4, photoelectrical coupler; 5, signal driver; 6, the second amplifier; 7, wave filter; 8, detecting electrode.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the present invention is described in further detail.
The present invention is using photoelectrical coupler 4 as separatrix, conduct first circuit be connected with the input end of photoelectrical coupler 4, output terminal be connected as second circuit, the power supply of the first circuit and second circuit adopt independently Power supply respectively, namely the first circuit adopts VCC1 to power, second circuit adopts VCC2 to power, and power supply VCC1 and power supply VCC2 is not altogether, first circuit and second circuit complete parttion are come, and the state reacting condition of electrolytic solution is in the first circuit, avoid the impact of second circuit on the first circuit, thus improve the precision of measuring instrument.
Be provided with sine-wave generator 1 in first circuit, the frequency of this sine-wave generator 1 is 28 hertz, and amplitude is 7 volts.Sine-wave generator 1 connects the positive pole of detecting electrode 8 by current-limiting resistance R1, and the negative pole of detecting electrode 8 connects the power cathode of the first circuit; The positive pole of detecting electrode 8 by signal driver 5 for wave detector 2 provides input signal, the output signal of wave detector 2 amplifies the input end of shaping rear drive photoelectrical coupler 4 through the first amplifier 3, make its conducting, thus make the output terminal conducting of photoelectrical coupler 4, by the signal reaction of detection on second circuit.Be provided with the second amplifier 6 and wave filter 7 in second circuit, the output signal that the output signal of photoelectrical coupler 4 gives the second amplifier 6, second amplifier 6 is given wave filter 7 and is carried out filtering.
During use, the resistance changed with the state of electrolytic solution is equivalent between detecting electrode 8, the sine wave that amplitude changes is obtained after carrying out linear dividing potential drop with current-limiting resistance R1, this sine wave delivers to wave detector 2 through signal driver 5, sine wave is carried out full-wave rectification by wave detector 2, amplify rear drive photoelectrical coupler 4 through the first amplifier 3 to work, then after the second amplifier 6 amplifies, give wave filter 7 and carry out filtering, complete testing, and according to other circuit working of this detection signal drives, finally complete moisture measurement.In testing process, because detection signal obtains via linear dividing potential drop, can ensure that measuring instrument carries out continuous duplicate measurements.
The measurement instrument for trace water of this kind of testing circuit is adopted to use through repetition test, 100 microgram ± 1 micrograms can be reached, namely in electrolytic cell, 100 microgram water are added, testing result is between 99 ~ 101 micrograms, in degree of accuracy, comparatively prior art improves a lot, can the water percentage of precisely control product more.
Adopt sine-wave generator 1 as symmetrical wave generator in above-described embodiment, certainly square-wave generator or triangular wave can also be adopted, as long as it is symmetrical about pole axis to meet its waveform, can make to be positioned at pole axis upper waveform area mutually reciprocity with the waveform area being positioned at below, offset, such potential electrode would not affect the state of electrolytic solution, and only has Faradaic current to have impact to electrolytic solution state.The symmetrical wave frequency that symmetrical wave generator produces can be the arbitrary value between 20 ~ 50 hertz, can also be specifically 20 hertz, 33 hertz, 40 hertz or 50 hertz; Amplitude can be the arbitrary value between 7 ~ 10 volts, is specifically as follows 8 volts, 9 volts or 10 volts.
The above, it is only preferred embodiment of the present invention, be not restriction the present invention being made to other form, any those skilled in the art may utilize the technology contents of above-mentioned announcement to be combined, change or retrofit and be Equivalent embodiments of the present invention.But everyly do not depart from technical solution of the present invention content, any simple modification, equivalent variations and the remodeling done above embodiment according to technical spirit of the present invention, still belong to the protection domain of technical solution of the present invention.
Claims (6)
1. a high precision micro drimeter testing circuit, comprise the first circuit and second circuit, it is characterized in that: the first circuit and second circuit are separated by photoelectrical coupler, first circuit is connected with the input end of photoelectrical coupler, second circuit is connected with the output terminal of photoelectrical coupler, and the power supply of the first circuit and the power supply of second circuit are independent mutually;
First circuit comprises symmetrical wave generator, detecting electrode and wave detector, and symmetrical wave generator connects the positive pole of detecting electrode by current-limiting resistance, and the negative pole of detecting electrode connects the power cathode of the first circuit; The just very wave detector of detecting electrode provides input signal, and wave detector drives the input end of photoelectrical coupler.
2. high precision micro drimeter testing circuit according to claim 1, is characterized in that: add the first amplifier between described wave detector and photoelectrical coupler.
3. high precision micro drimeter testing circuit according to claim 2, is characterized in that: described symmetrical wave generator is sine-wave generator or square-wave generator.
4. high precision micro drimeter testing circuit according to claim 4, is characterized in that: the frequency of described symmetrical wave generator is 20 ~ 50Hz, and amplitude is 7 ~ 10V.
5., according to the arbitrary described high precision micro drimeter testing circuit of Claims 1-4, it is characterized in that: described second circuit is provided with wave filter, wave filter connects the output terminal of photoelectrical coupler.
6. high precision micro drimeter testing circuit according to claim 5, is characterized in that: add the second amplifier between described wave filter and photoelectrical coupler.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610036246.3A CN105572206B (en) | 2016-01-20 | 2016-01-20 | A kind of high precision micro drimeter detection circuit |
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| CN201610036246.3A CN105572206B (en) | 2016-01-20 | 2016-01-20 | A kind of high precision micro drimeter detection circuit |
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| CN105572206A true CN105572206A (en) | 2016-05-11 |
| CN105572206B CN105572206B (en) | 2019-01-25 |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4209741A (en) * | 1978-03-08 | 1980-06-24 | The United States Of America As Represented By The Secretary Of The Interior | Apparatus for the continuous monitoring of ground bed resistance |
| CN2075342U (en) * | 1990-05-29 | 1991-04-17 | 湖南仪器仪表总厂天平仪器厂 | Fast tester for moisture content |
| CN2160905Y (en) * | 1993-05-05 | 1994-04-06 | 滕召胜 | Numeric display rod-inserted type quick hygrometer |
| CN1619301A (en) * | 2003-11-21 | 2005-05-25 | 马孝义 | Dielectric frequency difference soil water content sensor |
| CN2847282Y (en) * | 2005-09-30 | 2006-12-13 | 湖南文理学院 | Novel textile fiber water content detector |
| CN2847279Y (en) * | 2005-11-10 | 2006-12-13 | 上海港复兴船务公司 | Water content detector for lubricating oil |
| CN1880953A (en) * | 2006-04-22 | 2006-12-20 | 重庆大学 | Method and apparatus for layered liquid interface detection based on resistivity difference |
| CN101776617A (en) * | 2009-01-12 | 2010-07-14 | 中国农业机械化科学研究院 | Microwave on-line grain moisture content detection device and method thereof |
| CN201885979U (en) * | 2010-11-24 | 2011-06-29 | 昆明理工大学 | Agricultural powder moisture measuring instrument |
-
2016
- 2016-01-20 CN CN201610036246.3A patent/CN105572206B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4209741A (en) * | 1978-03-08 | 1980-06-24 | The United States Of America As Represented By The Secretary Of The Interior | Apparatus for the continuous monitoring of ground bed resistance |
| CN2075342U (en) * | 1990-05-29 | 1991-04-17 | 湖南仪器仪表总厂天平仪器厂 | Fast tester for moisture content |
| CN2160905Y (en) * | 1993-05-05 | 1994-04-06 | 滕召胜 | Numeric display rod-inserted type quick hygrometer |
| CN1619301A (en) * | 2003-11-21 | 2005-05-25 | 马孝义 | Dielectric frequency difference soil water content sensor |
| CN2847282Y (en) * | 2005-09-30 | 2006-12-13 | 湖南文理学院 | Novel textile fiber water content detector |
| CN2847279Y (en) * | 2005-11-10 | 2006-12-13 | 上海港复兴船务公司 | Water content detector for lubricating oil |
| CN1880953A (en) * | 2006-04-22 | 2006-12-20 | 重庆大学 | Method and apparatus for layered liquid interface detection based on resistivity difference |
| CN101776617A (en) * | 2009-01-12 | 2010-07-14 | 中国农业机械化科学研究院 | Microwave on-line grain moisture content detection device and method thereof |
| CN201885979U (en) * | 2010-11-24 | 2011-06-29 | 昆明理工大学 | Agricultural powder moisture measuring instrument |
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