CN105158578A - Bridge method-based device for measuring dielectric constant of organism - Google Patents
Bridge method-based device for measuring dielectric constant of organism Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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Abstract
The invention provides a bridge method-based device for measuring the dielectric constant of an organism. The device comprises a power supply circuit, a sensor circuit, a signal acquisition circuit, a signal processing module and a data display module. The power supply circuit supplies desired voltages to different circuits. The sensor circuit is used for converting capacitance values into square-wave oscillation signals inversely proportional to the capacitance values. The signal acquisition circuit is used for acquiring the square-wave oscillation signals generated by the sensor circuit and then preliminarily processing the signals. The signal processing module and the data display module are used for finally processing the signals acquired by the signal acquisition circuit. By the sensor circuit, the values of parameters related to the dielectric constant of a to-be-measured object is firstly converted into capacitance values and then the capacitance values are converted into square-wave oscillation signals. The square-wave oscillation signals are acquired by the peripheral circuit of a single-chip microcomputer and then are input into the single-chip microcomputer to be processed. Subsequently, the processing result of the single-chip microcomputer is transmitted to the display module. The device is simple in principle, small in module dimension, convenient to carry, fast in measurement speed and high in sensitivity. Therefore, the device facilitates the real-time monitoring process of parameters related to the dielectric constant.
Description
Technical field
The present invention relates to a kind of device of dielectric constant measurement, especially measure the measurement of in vitro biosome specific inductive capacity.
Background technology
The specific inductive capacity of biosome is an important physical quantity, and it reflects the polarization characteristic of bio-tissue under External Electrical Field and the generation of loss phenomenon, it determined by the inherent attribute of material itself.The water cut of the same tissue of different tissues of same biosome constituent that is different and each tissue is different etc., and the value of specific inductive capacity all can be caused different.
The specific inductive capacity of bio-tissue is an important physical quantity, and it is research electromagnetic property and the interaction between electromagnetic wave and bio-tissue.The pathology that biological tissue occurs, as inflammation, oedema, hyperemia or canceration etc., can reflect in the dielectric property of biological tissue, namely the specific inductive capacity of linked groups can change, such as according to the generation tissue of pathology and the different of normal structure specific inductive capacity, position and the size of tumour can be detected.Therefore the specific inductive capacity measuring biological tissue has practical value and realistic meaning.
The method of Measuring Dielectric Constant is a lot, and according to the difference measuring frequency range, the method for use is also distinguished to some extent.The method that current Measuring Dielectric Constant adopts has bridge method, Resonant-cavity Method, free-space Method, coaxial probe method, transmission method etc.It is 1-10 that the method for general measure complex permittivity can reach frequency range
17hz, the scope of temperature can from-273.15 DEG C to 1650 DEG C.Even but above-mentioned scope, still there is the problem of the accuracy of measurement.Because for commaterial (inorganic matter tissue and bio-tissue), often there is any discrepancy for the data of different researcher reports.Especially for the material of extremely low loss and high loss, data error is larger.And it is also less for the method measuring biosome specific inductive capacity at present.Chinese invention patent patent publication date is on 04 23rd, 2014, and publication number CN201210255630 discloses a kind of brain edema variation measuring method based on minimum impedance frequency.This invention adopt carry out computational load impedance by impedance measurement, obtain a kind of method measuring cerebral tissue change in dielectric constant, with the present invention adopt the method based on bridge measurement to be two kinds of principles, method cuts both ways.And the device that the present invention makes is easy to carry, measuring speed is fast, and data are also relatively more accurate, can carry out real-time monitoring device use.
Summary of the invention
The invention provides a kind of based on bridge measurement biosome specific inductive capacity device, this device not only can measure electric capacity and the specific inductive capacity of inorganic matter, can also measure the specific inductive capacity of in vitro biosome.
For realizing above function, the technical solution used in the present invention is a kind of based on bridge measurement biosome specific inductive capacity device, and this device comprises feed circuit, sensor circuit, signal acquisition circuit, signal processing module, data disaply moudle; Feed circuit provide required voltage for different circuit; Sensor circuit is in order to change the square wave oscillation signal be inversely proportional to it into by capacitance Cx; Signal acquisition circuit carries out collection and rough handling in order to the square wave oscillation signal produced by sensor circuit; Signal processing module and data disaply moudle finally process in order to the signal collected by collection signal circuit.
As shown in Figure 1, feed circuit are sensor circuit, signal acquisition circuit, signal processing module and data disaply moudle provide relevant voltage, and each circuit and module can normally be worked.The square-wave signal that sensor collects by sensor circuit passes to signal acquisition circuit, through the work such as filtering of signal acquisition circuit, be sent to signal processing module again, the routine processes of the preset software in signal processing module, finally deliver to display module to show, demonstrate electric capacity and specific inductive capacity equivalence.
Described signal acquisition module is connected with signal processing module, the Signal reception that sensor circuit inputs by signal acquisition module also exports signal processing module to after buffering, causes interference to prevent excessive interference voltage or the excessive single chip circuit to downstream of electric current and damages.
Described signal processing module adopts single-chip microcomputer to be main control chip, and its peripheral circuit comprises reset circuit, crystal oscillating circuit and surge protection circuit.Reset circuit is the time-delay characteristics utilizing RC circuit, selects a 10K resistance and 10nF electric capacity herein, and time delays meets the reset requirement of System on Chip/SoC.The port 3 of main control chip is connected to after resistance, electric capacity, switch in parallel.And 3.3V power supply that resistance is connected.What crystal oscillating circuit was selected is the passive crystal oscillator of 8M, and the passive crystal oscillator two ends of 8M are respectively by the capacity earth of 20pF, and circuit is simple and be easy to make crystal oscillator starting of oscillation.Surge protection circuit is two the shunt capacitance C preventing instant high-voltage defective chip and adopt
1, C
2, after surge protection circuit is connected with crystal oscillating circuit, be connected to one-chip machine port 2.
Described feed circuit utilize main control chip and circuit that charging voltage is dropped to 4.2V to lithium cell charging for sensor circuit is powered from the voltage of 5V.
Be that the signal processing module of core and display module need 3.3V supply voltage, because the output voltage of lithium battery is higher than 3.3V, so need voltage conversion chip that voltage transitions is become 3.3V, for signal processing module and display module are powered at single-chip microcomputer.
Be provided with a plane-parallel capacitor in described sensor circuit, in the middle of two parallel-plates of this plane-parallel capacitor, place tested organism.
Two parallel-plate structures of described plane-parallel capacitor are circular or square, the outside surface overlay film of two parallel-plates of plane-parallel capacitor.
Two parallel-plate materials of described plane-parallel capacitor are aluminium or copper.And according to By consulting literatures, parallel plate capacitor width H and the edge effect and negligible when being greater than certain value of the ratio of spacing d.Therefore the diameter of parallel circular plate is set to 9cm-11cm, and the length of side of square parallel plate is 8cm-10cm, and namely its two parallel-plates plate maximum spacing needs to be less than 5mm-6mm, and will reduce the spacing between pole plate when Measuring Dielectric Constant as far as possible.
Described sensor circuit comprises capacitor, multi-resonant oscillating circuit; Multi-resonant oscillating circuit comprises LMC555 counter, resistance R1, resistance R2.Wherein capacitor is connected to 5 ports of LMC555 counter, and resistance R1, resistance R2 are connected to port 5 and port 2.The resistance of conversion R1 and R2, just obtains the square-wave signal of different frequency.Port 3 is positioned at and exports square-wave signal end.
Described single-chip microcomputer adopts STM32F051 to be main control chip.
The EDA open language of single-chip microcomputer mentions the instrument MDK that software platform is the exploitation of ARM company, integrate the μ VisionIDE environment of Keil and the advantage of ARM compilation tool RVCT, be referred to as again Keil μ Vision4, this integration environment can the editor of completion code, compiling, link, debugging and in-circuit emulation debugging well.The required computing formula calculated of software write that this platform compiles is very convenient.
The algorithm of single-chip microcomputer signal transacting is: when reaching the 1ms (unit interval of setting) of system clock, STM32 chip has captured N number of cycle (periodically variable number of times), frequency f, capacitance can be obtained, and finally obtain the relative dielectric constant of biosome.GPIO initialization, time base initialization, signals collecting program, signal handler as follows:
GPIO initialization
GPIO_InitTypeDefGPIO_InitStructure; // initialization GPIO structure
TIM_TimeBaseInitTypeDefTIM_TimeBaseStructure；
RCC_AHBPeriphClockCmd (RCC_AHBPeriph_GPIOA, ENABLE); // enable GPIOA
RCC_APB1PeriphClockCmd (RCC_APB1Periph_TIM2, ENABLE); // enable TIM2
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_0; The GPIO pin A0 that // selection will control
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA,ENABLE)；
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF; // the pattern that arranges pin is multiplexing output
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz; The speed of // pin is 50MHz
GPIO_InitStructure.GPIO_OType＝GPIO_OType_PP；
GPIO_InitStructure.GPIO_PuPd＝GPIO_PuPd_NOPULL；
GPIO_Init (GPIOA, & GPIO_InitStructure); // according to above-mentioned controling parameters initialization GPIO
Time base initialization
TIM_TimeBaseInitTypeDefTIM_TimeBaseStructure；
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2,ENABLE)；
TIM_TimeBaseStructure.TIM_Period=0xFFFFFFFF; // when timer count down to 4294967295 from 0, being 4294967296 times, is a timing cycle
TIM_TimeBaseStructure.TIM_Prescaler=0; // pre-frequency division is set: not pre-frequency division, is 48MHz
TIM_TimeBaseStructure.TIM_ClockDivision=0; // clock division coefficient is set: not frequency division
TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up; // upwards count mode
TIM_TimeBaseInit (TIM2, & TIM_TimeBaseStructure); // according to above-mentioned controling parameters initialization TIM2
Signals collecting program
/ * configure TIM2 be external trigger input capture */
TIM_ETRConfig (TIM2, TIM_ExtTRGPSC_OFF, TIM_ExtTRGPolarity_Inverted, 0); The clock source selection external trigger input capture of //TIM2; Without pre-divider, namely catch each rising edge
TIM_SetCounter(TIM2,0)；
TIM_Cmd (TIM2, ENABLE); // enable TIM2
Signal handler
if(Main_Thread＝＝1)
{
Temp=TIM_GetCounter (TIM2); // frequency f
Temp2=1000000000000/ (temp*0.693*32400*3); // capacitance
Sprintf (b, " Pmt:%.3f ", temp2*0.005/ (0.082*0.082*8.85)); // relative dielectric constant
Main_Thread＝0；
TIM_SetCounter (TIM2,0); // to arrange TIM2 numerical value be 0
The beneficial effect of patent of the present invention is: the present invention is for main control chip with single-chip microcomputer STM32F051, successfully object under test is formerly become electric capacity at sensor circuit, inputted single-chip microcomputer process by the peripheral circuit collection of single-chip microcomputer after becoming square-wave signal again, result is transferred to display module by single-chip microcomputer subsequently.This principle of device is simple, and module is smaller, be convenient for carrying, measuring speed is fast, sensitivity high.Certain facility can be provided for the parameter that Real-Time Monitoring is relevant to specific inductive capacity.
Accompanying drawing explanation
Fig. 1 is the structural representation of this device.
Fig. 2 is that the specific inductive capacity of pork liver 1 is with moisture changing trend diagram.
Fig. 3 is that the specific inductive capacity of pork liver 2 is with moisture changing trend diagram.
Embodiment
Below in conjunction with drawings and Examples, describe the technical scheme of patent of the present invention in detail.
Accompanying drawing 1 is the system architecture schematic diagram of patent of the present invention.As shown in Figure 1, a kind of device based on bridge measurement biosome specific inductive capacity, it is characterized in that: comprise the square wave oscillation letter sensor circuit for different circuit provides the feed circuit of required voltage, just capacitance Cx to change into be inversely proportional to it, the square-wave signal collection produce sensor circuit the signal acquisition circuit of rough handling, carry out signal processing module and the data disaply moudle of final process by the signal that the collection of collection signal circuit comes.
First charging voltage is dropped to 4.2V to lithium cell charging from the voltage of 5V, for sensor circuit is powered by different power voltage supply module.And need on the supply voltage of 3.3V at sensor chip and display module, therefore by voltage conversion chip, voltage transitions is become 3.3V, for signal processing module and display module are powered.
Plane-parallel capacitor in sensor circuit and circuit forms a measurement mechanism, placing the rear of object under test in this parallel-plate is exactly variable capacitor Cx, by the access of this capacitor by the sensor circuit just constituting this system in the multi-resonant oscillating circuit that LMC555, R1, R2 etc. are formed, capacitance Cx can be changed into the square wave oscillation signal be inversely proportional to it by this circuit.When measured medium fills plane-parallel capacitor, the mechanical periodicity of multivibrator can be caused, thus cause relative dielectric constant to change.
Signal acquisition module is connected on signal processing module, and Signal reception sensor can sent here also sends into signal processing module after buffering.
Be that the software that the Information Pull that acquisition module transmits weaves in advance carries out processing and is sent to display module and shows by the message processing module of core again with single-chip microcomputer.
Embodiment 1
First carry out the inspection of dielectric constant measuring apparatus: prepare power supply, plane-parallel capacitor, 3 103 electric capacity, circuit system designed by patent of the present invention.
Electric capacity is accessed sensor circuit, then starts power supply, after initialization, restart sensor circuit, sense data in display screen.Result is as follows
As can be known from the above table, the relative error of 103 electric capacity is about 7% ~ 8%, meets the error of its electric capacity own, this concept feasible is described and essence is higher.
Embodiment 2
Prepare following material: the circuit system of power supply, homemade square parallel plate capacitor (length of side H=8.2cm), A4 paper, plank, pork liver several (fresh), Patent design of the present invention.Identically with example 1 first to connect and start-up circuit, specific as follows: the A4 paper processed flatly is put into plane-parallel capacitor, opening power after in the circuit of access design, display screen can demonstrate the relative dielectric constant of A4 paper, put into plank after cleaning A4 paper, the relative dielectric constant of plank can be obtained.
As can be seen from the above table, the reference value (reference value 3.24 of paper, the reference value 4.86 of plank) in the relative dielectric constant of A4 paper and plank and document is very close, more verifies the reliability of this scheme.Although very close with reference value, but still there is any discrepancy with the value in document, ascribe following two reasons to: be the error because circuit and homemade plane-parallel capacitor imperfection cause on the one hand, another side is because what paper, plank not indicating in document be, even same paper, also likely produce because of different manufacturers, cause the material structure of paper different, thus specific inductive capacity is distinguished to some extent.Even the plank of one species, also specific inductive capacity can be caused different etc. because of the reason of Different Individual.Generally speaking, this measurement result is reliable.
Embodiment 3
Bio-tissue has that specific inductive capacity is high, out-of-shape, the feature that water cut is high.The bio-tissue that patent of the present invention is measured is pork liver, due to factors such as the shape of Organism Samples, size and inner structure are uneven, all can affect the value of specific inductive capacity.Even if so come from same pork liver, but non-homogeneous and to some extent not due to the inner structure of pork liver, therefore the relative dielectric constant recorded can not be carried out simple average, need list one by one.The present invention's research is the variation tendency of specific inductive capacity with water cut of pork liver.
Cut two test samples from fresh same pork liver simultaneously, be labeled as pork liver 1 and pork liver 2 measure complete after it is put into cool place place (laboratory is at basement) upstairs, its moisture can be made like this to evaporate quicker.Plane-parallel capacitor is put into after pork liver processing with scalpel, can direct readout value relative dielectric constant in OLED display screen, the trend map of result is as shown in Figures 2 and 3.
As can be seen from upper figure, for the different parts of the same tissue of same biosome, its specific inductive capacity also has very large difference.Because the different parts in same tissue its water cut and hole etc. have difference, so cause specific inductive capacity result to have difference.Also be not difficult to find out simultaneously, the relative dielectric constant of same biosome declines along with the minimizing of moisture, especially after 15 minutes, specific inductive capacity downward trend steepest, it is fast that this is not only the speed lost because of liver surface moisture, also because the reason of pork liver superficial cell death, when again putting into electric field, the polar molecule of superficial cell is no longer active, and specific inductive capacity is declined.Known from the change in dielectric constant trend and result of two pieces of tissues, the measurement result of this device specific inductive capacity is reliable.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention.
Claims (6)
1., based on a bridge measurement biosome specific inductive capacity device, it is characterized in that: this device comprises feed circuit, sensor circuit, signal acquisition circuit, signal processing module, data disaply moudle; Feed circuit provide required voltage for different circuit; Sensor circuit is in order to change the square wave oscillation signal be inversely proportional to it into by capacitance; Signal acquisition circuit carries out collection and rough handling in order to the square wave oscillation signal produced by sensor circuit; Signal processing module and data disaply moudle finally process in order to the signal collected by collection signal circuit;
Feed circuit are sensor circuit, signal acquisition circuit, signal processing module and data disaply moudle provide relevant voltage, and each circuit and module can normally be worked; The square-wave signal that sensor collects by sensor circuit passes to signal acquisition circuit, through the work such as filtering of signal acquisition circuit, be sent to signal processing module again, the routine processes of the preset software in signal processing module, finally deliver to display module to show, demonstrate electric capacity and specific inductive capacity equivalence;
Described signal acquisition module is connected with signal processing module, the Signal reception that sensor circuit inputs by signal acquisition module also exports signal processing module to after buffering, causes interference to prevent excessive interference voltage or the excessive single chip circuit to downstream of electric current and damages;
Described signal processing module adopts single-chip microcomputer to be main control chip, and its peripheral circuit comprises reset circuit, crystal oscillating circuit and surge protection circuit; Reset circuit is the time-delay characteristics utilizing RC circuit, selects a 10K resistance and 10nF electric capacity herein, and time delays meets the reset requirement of System on Chip/SoC; The port 3 of main control chip is connected to after resistance, electric capacity, switch in parallel; And 3.3V power supply that resistance is connected; What crystal oscillating circuit was selected is the passive crystal oscillator of 8M, and the passive crystal oscillator two ends of 8M are respectively by the capacity earth of 20pF, and circuit is simple and be easy to make crystal oscillator starting of oscillation; Surge protection circuit is two the shunt capacitance C preventing instant high-voltage defective chip and adopt
1, electric capacity C
2, after surge protection circuit is connected with crystal oscillating circuit, be connected to one-chip machine port 2;
Described feed circuit utilize main control chip and circuit that charging voltage is dropped to 4.2V to lithium cell charging for sensor circuit is powered from the voltage of 5V;
Be that the signal processing module of core and display module need 3.3V supply voltage, because the output voltage of lithium battery is higher than 3.3V, so need voltage conversion chip that voltage transitions is become 3.3V, for signal processing module and display module are powered at single-chip microcomputer;
Be provided with a plane-parallel capacitor in described sensor circuit, in the middle of two parallel-plates of this plane-parallel capacitor, place tested organism.
2. one according to claim 1 is based on bridge measurement biosome specific inductive capacity device, it is characterized in that: two parallel-plate structures of described plane-parallel capacitor are circle or square, the outside surface overlay film of two parallel-plates of plane-parallel capacitor.
3. one according to claim 1 is based on bridge measurement biosome specific inductive capacity device, it is characterized in that: two parallel-plate materials of described plane-parallel capacitor are aluminium or copper; The diameter of parallel circular plate is set to 9cm-11cm, and the length of side of square parallel plate is 8cm-10cm, and two parallel-plate maximum spacings need to be less than 5mm-6mm, and will reduce the spacing between pole plate when Measuring Dielectric Constant as far as possible.
4. one according to claim 1 is based on bridge measurement biosome specific inductive capacity device, it is characterized in that: described sensor circuit comprises capacitor, multi-resonant oscillating circuit; Multi-resonant oscillating circuit comprises LMC555 counter, resistance R1, resistance R2; Wherein capacitor is connected to 5 ports of LMC555 counter, and resistance R1, resistance R2 are connected to port 5 and port 2; The resistance of conversion R1 and R2, just obtains the square-wave signal of different frequency; Port 3 is positioned at and exports square-wave signal end.
5. one according to claim 1 is based on bridge measurement biosome specific inductive capacity device, it is characterized in that: described single-chip microcomputer adopts STM32F051 to be main control chip.
6. one according to claim 1 is based on bridge measurement biosome specific inductive capacity device, it is characterized in that:
The algorithm of single-chip microcomputer signal transacting is, when reaching the 1ms of system clock, STM32 chip has captured N number of cycle, and frequency f, capacitance can be obtained, and finally obtains the relative dielectric constant of biosome; GPIO initialization, time base initialization, signals collecting program, signal handler as follows,
GPIO initialization
GPIO_InitTypeDefGPIO_InitStructure; // initialization GPIO structure
TIM_TimeBaseInitTypeDefTIM_TimeBaseStructure；
RCC_AHBPeriphClockCmd (RCC_AHBPeriph_GPIOA, ENABLE); // enable GPIOA
RCC_APB1PeriphClockCmd (RCC_APB1Periph_TIM2, ENABLE); // enable TIM2
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_0; The GPIO pin A0 that // selection will control
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA,ENABLE)；
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF; // the pattern that arranges pin is multiplexing output
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz; The speed of // pin is 50MHz
GPIO_InitStructure.GPIO_OType＝GPIO_OType_PP；
GPIO_InitStructure.GPIO_PuPd＝GPIO_PuPd_NOPULL；
GPIO_Init (GPIOA, & GPIO_InitStructure); // according to above-mentioned controling parameters initialization GPIO
Time base initialization
TIM_TimeBaseInitTypeDefTIM_TimeBaseStructure；
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2,ENABLE)；
TIM_TimeBaseStructure.TIM_Period=0xFFFFFFFF; // when timer count down to 4294967295 from 0, be
4294967296 times is a timing cycle
TIM_TimeBaseStructure.TIM_Prescaler=0; // pre-frequency division is set: not pre-frequency division, is 48MHz
TIM_TimeBaseStructure.TIM_ClockDivision=0; // clock division coefficient is set: not frequency division
TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up; // upwards count mode
TIM_TimeBaseInit (TIM2, & TIM_TimeBaseStructure); // according to above-mentioned controling parameters initialization TIM2
Signals collecting program
/ * configure TIM2 be external trigger input capture */
TIM_ETRConfig (TIM2, TIM_ExtTRGPSC_OFF, TIM_ExtTRGPolarity_Inverted, 0); The clock of //TIM2
External trigger input capture is selected in source; Without pre-divider, namely catch each rising edge
TIM_SetCounter(TIM2,0)；
TIM_Cmd (TIM2, ENABLE); // enable TIM2
Signal handler
if(Main_Thread＝＝1)
{
Temp=TIM_GetCounter (TIM2); // frequency f
Temp2=1000000000000/ (temp*0.693*32400*3); // capacitance
Sprintf (b, " Pmt:%.3f ", temp2*0.005/ (0.082*0.082*8.85)); // relative dielectric constant
Main_Thread＝0；
TIM_SetCounter (TIM2,0); // to arrange TIM2 numerical value be 0
。
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|---|---|---|---|
| CN201510527218.7A CN105158578A (en) | 2015-08-25 | 2015-08-25 | Bridge method-based device for measuring dielectric constant of organism |
| PCT/CN2015/094080 WO2017031833A1 (en) | 2015-08-25 | 2015-11-08 | Device for measuring dielectric constant of organism based on bridge method |
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| CN201510527218.7A CN105158578A (en) | 2015-08-25 | 2015-08-25 | Bridge method-based device for measuring dielectric constant of organism |
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| CN109682463A (en) * | 2019-02-14 | 2019-04-26 | 深圳供电局有限公司 | Substation's audible noise measuring method |
| CN110907505A (en) * | 2019-12-02 | 2020-03-24 | 四川中大华瑞能源技术有限公司 | Non-contact online real-time moisture detector |
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| CN109682463A (en) * | 2019-02-14 | 2019-04-26 | 深圳供电局有限公司 | Substation's audible noise measuring method |
| CN110907505A (en) * | 2019-12-02 | 2020-03-24 | 四川中大华瑞能源技术有限公司 | Non-contact online real-time moisture detector |
| CN110907505B (en) * | 2019-12-02 | 2022-04-15 | 四川中大华瑞能源技术有限公司 | Non-contact online real-time moisture detector |
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| WO2017031833A1 (en) | 2017-03-02 |
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