CN103115656B - Method and device for detecting position of fluid channel - Google Patents
Method and device for detecting position of fluid channel Download PDFInfo
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- CN103115656B CN103115656B CN201310071152.6A CN201310071152A CN103115656B CN 103115656 B CN103115656 B CN 103115656B CN 201310071152 A CN201310071152 A CN 201310071152A CN 103115656 B CN103115656 B CN 103115656B
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Abstract
The invention relates to the technical field of medical detection, in particular to a device and a method for detecting the position of a fluid channel. According to the technical scheme, two pairs of special handled small electrodes are placed on two appointed positions in the middle or a fluid channel pipeline, impedance between the electrodes is collected so as to achieve detecting to the position of the fluid channel, and therefore extracting amount of to-be-detected solution of blood is controlled, and reliability of measurement is increased, furthermore, impedance of the solution is detected through an alternating current impedance method so as to achieve measurement with high precision, and in addition, the position of the fluid channel is detected and meanwhile whether the fluid channel is mixed with bubbles or not can be further judged, and corresponding process is conducted, and therefore precision of system detection is improved.
Description
Technical field
the present invention relates to technical field of medical detection, be specifically related to method and the device of the detection of a kind of fluid path position.
Background technology
fluid path position detecting system is usually applied in the relevant instrument such as blood analysis, blood gas analysis, is mainly used in the extraction amount controlling solution to be checked or blood.When the diameter of fluid path pipeline is larger, generally can will put into fluid path by most liquid sensor on the market very easily, by the process to electric signal, the position detecting fluid path is easier to realize.Along with the development of blood testing technology, the instrument of blood analysis is more and more less, blood or the amount of solution to be checked of corresponding extraction will be fewer and feweri, and this just requires that the pipe diameter of fluid path is less, become compare stubborn problem with the accurate location that little sensor realizes fluid path.In addition, conventional fluid path method for detecting position has capacitive transducer, DC electrode formula etc., these technology also all Shortcomings part, and capacitive transducer needs larger area could realize accurate measurement; DC impedance surveys the larger solution of method measurement impedance, and the resistance of coupling causes more greatly detection reaction insensitive.
therefore prior art also exists deficiency.
Summary of the invention
for overcoming above-mentioned defect, namely object of the present invention is a kind of method that fluid path position is detected and device.
the object of the invention is to be achieved through the following technical solutions:
the device that the present invention detects a kind of fluid path position, mainly comprises:
fluid path pipeline;
pumping device, is connected with described fluid path pipeline, for extracting the solution of described fluid path pipeline inlet;
the first electrode pair detected for fluid path position and the second electrode pair, be positioned over two assigned addresses of described fluid path pipeline, the electrode diameter of described each electrode pair is 0.1mm ~ 1mm, between two electrodes of each electrode pair, distance range is 0.5mm ~ 2cm, and electrode surface is gold-plated and scribble hydrophilic chemistries medicine;
first passage change-over switch and second channel change-over switch, be connected with described two electrode pairs respectively, for switching the resistance value of the second electrode pair described in collection and the first electrode pair;
reference resistance, is connected with second channel change-over switch with described first passage change-over switch, for providing partial pressure value for subsequent calculations electrode pair resistance value;
alternating message source, is connected with described reference resistance, for provide for the impedance detection circuit of described electrode pair one ac-excited;
signal acquisition control system, is connected with described reference resistance with described first passage change-over switch, second channel change-over switch, for completing the conversion of voltage signal, collection and subsequent treatment and control.
further, described signal acquisition control system comprises,
extracting liquid control module, is connected with described pumping device, for controlling pumping device extracting liquid;
change-over switch control module, is connected with second channel change-over switch with described first passage change-over switch, for controlling described first passage change-over switch and second channel change-over switch switches in scheduled duration interval;
precision rectifying unit, is connected with second channel change-over switch with described first passage change-over switch, and the AC signal for dividing potential drop being obtained converts rear output direct current signal;
aD conversion unit, is connected with described precision rectifying unit, for analog DC signal is converted to digital signal;
electrode pair impedance computation unit, is connected with described AD conversion unit, for the second electrode pair described in calculating according to the digital signal after conversion and the resistance value of the first electrode pair;
first electrode pair impedance threshold judging unit, is connected with extracting liquid control module with described electrode pair impedance computation unit, for judging whether the resistance value of the first described electrode pair exceedes presetting threshold value;
second electrode pair impedance threshold judging unit, be connected with extracting liquid control module with described electrode pair impedance computation unit, the first electrode pair impedance threshold judging unit, for judging whether the resistance value of the second described electrode pair exceedes presetting threshold value.
further, described signal acquisition control system also comprises,
abnormal prompt and alarm unit, be connected with the second electrode pair impedance threshold judging unit with the first described electrode pair impedance threshold judging unit, for when the first described electrode pair and the second electrode pair resistance value exceed presetting threshold value, carry out abnormal information output and warning.
further, the first described electrode pair and the second electrode pair are produced on PCB printed circuit board (PCB), and are enclosed in described fluid path pipeline.
a kind of method that the present invention detects fluid path position, comprises the steps:
step I, two pairs of electrodes are placed respectively at two assigned addresses of fluid path pipeline, the electrode diameter of described each electrode pair is 0.1mm ~ 1mm, and between two electrodes of each electrode pair, distance range is 0.5mm ~ 2cm, and electrode surface is gold-plated and scribble hydrophilic chemistries medicine;
two pairs of electrodes are connected with AC impedance testing circuit by the switching of two switches in scheduled duration by step II respectively, calculate the resistance value of two pairs of electrodes by gathering partial pressure value respectively;
step III, controls pumping device extracting liquid;
does step IV, judge that the resistance value closer to the first electrode pair of inlet is being preset within the scope of the first impedance threshold? in this way, then enter step V, as no, then return step III;
does step V, judge that the resistance value of the second electrode pair is being preset within the scope of the first impedance threshold? in this way, then enter step VI, as no, then return step III;
step VI, stops drawing liquid and carries out fluid analysis process.
further, described step IV, when judging that the resistance value closer to the first electrode pair of inlet is not when presetting within the scope of the first impedance threshold, also comprises, do you judge that the resistance value of the first electrode pair is being preset within the scope of the second impedance threshold? in this way, then step III is returned.
further, as judged, the resistance value of the first electrode pair is not presetting within the scope of the second impedance threshold, then carry out reporting to the police and abnormal prompt.
further, described step V, when the resistance value of judgement second electrode pair is not when presetting within the scope of the first impedance threshold, also comprises, judge that the resistance value of the second electrode pair is being preset within the scope of the second impedance threshold? in this way, then step III is returned.
further, as judged, the resistance value of the second electrode pair is not presetting within the scope of the second impedance threshold, then carry out reporting to the police and abnormal prompt.
a kind of blood gas analyzer, comprises the method and device that detect fluid path position as above.
technical scheme provided by the invention, by placing the small electrode of two pairs of special processings at two assigned addresses of fluid path pipeline central authorities, and the resistance of acquisition electrode realizes the detection of fluid path position thus controls the extraction amount of solution to be checked or blood, increase Measurement reliability, in addition, the impedance detecting solution by AC impedence method realizes high-precision measurement, have again, while detecting fluid path position, can also further judge whether be mixed into bubble in fluid path and process accordingly, improve the accuracy of systems axiol-ogy.
Accompanying drawing explanation
for ease of illustrating, the present invention is described in detail by following preferred embodiment and accompanying drawing.
fig. 1 is an embodiment schematic diagram of the device that a kind of fluid path position of the present invention is detected;
fig. 2 is another embodiment schematic diagram of the device that a kind of fluid path position of the present invention is detected;
fig. 3 is an embodiment schematic diagram of the method that a kind of fluid path position of the present invention is detected;
fig. 4 is another embodiment schematic diagram of the method that a kind of fluid path position of the present invention is detected.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
As shown in Figure 1, an enforcement illustration of the device of a kind of fluid path of the present invention position detection specifically describes as follows:
Fluid path position detecting device of the present invention, comprises pumping device 11, fluid path pipeline 19, the second electrode pair 12 and the first electrode pair 13 is detected in fluid path position, sense channel switches the first switch 14 and second switch 15, alternating message source 17, reference resistance 16 and signal acquisition control system 18.
Pumping device 11 is connected with described fluid path pipeline 19, for extracting the solution of described fluid path pipeline 19 inlet; Its critical piece is a pump of bleeding, and by air pump exhaust, makes to produce negative pressure in fluid path, and the solution of inlet just can enter in fluid path pipeline 19.
Fluid path pipeline 19, for depositing solution; The internal diameter of preferred pipeline is less, and diameter range is 1mm ~ 2mm, and the consumption of solution can be made so as far as possible little.
The second electrode pair 12 detected for fluid path position and the first electrode pair 13 are positioned over two assigned addresses of described fluid path pipeline 19, preferably electrode is placed the central authorities with pipeline, whether the solution judged in described fluid path by the impedance detecting described electrode pair arrives the position of specifying, wherein general preferably the first electrode pair 13 need to be positioned over inlet or its near, namely also two electrode pairs are compared is the first electrode pair closest to inlet, and the second electrode pair 12 needs to be positioned over the target location that solution arrives.The diameter range of each electrode is preferred 0.1mm ~ 1mm, and distance range is preferably 0.5mm ~ 2cm between two of often pair of electrode electrodes, distance is less than 0.5mm and residual solution can be caused to cover two electrode surfaces, cause detecting unsuccessfully, the sensitivity that distance is greater than 2cm detection can reduce, and can adjust the distance between electrode according to different sensitivity requirement.So, the fluid path between electrode pair 12 and electrode pair 13 is just electrochemical reaction region.Electrode pair 12 and electrode pair 13 are preferably the electrode for surface gold-plating, and because electrode is less, solution not easily also contacts good with electrode complete wetting.By preferred hydrophilic chemicals on electrode surface point, prerequisite is that these chemicalss can not affect electrochemical reaction, as NaCL, KCL etc.When solution coated electrode, solution is easier to well contact with electrode, ensures the reliable contacts of solution and electrode, and then ensures the reliability that fluid path position is detected.
First passage change-over switch 14 and second channel change-over switch 15 are connected with the first electrode pair 13 with the second described electrode pair 12 respectively, for switching the resistance value of the second electrode pair 12 described in collection and the first electrode pair 13, preferably can adopt analog switch, in fluid path impedance collection process, can realize only with a signal acquiring system, two-way fluid path impedance information can be gathered, save resource, improve service efficiency.In gatherer process, passage bridge switch 14 and 15 needs to go to switch according to scheduled duration interval in turn, and when switch 14 closes, switch 15 disconnects; When switch 14 disconnects, switch 15 closes.
Alternating message source 17 is connected with described reference resistance 16, for provide for the impedance detection circuit of described electrode pair one ac-excited; Its output signal is for AC sine signal, and frequency can free setting, and scope is 10KHz-100KHz.This signal source can adopt the resonant circuit of simulation to realize, and derived digital signal DDS also can be used to synthesize.
Reference resistance 16 is connected with second channel change-over switch 15 with described first passage change-over switch 14, for providing partial pressure value for subsequent calculations electrode pair resistance value, the precision resistance of a definite value can be preferably, can certainly be an adjustable resistance, choose Standard resistance range and be preferably 1K-20K.When solution covers fluid path position detecting electrode, the impedance dividing potential drop of reference resistance and solution, during different solution coated electrode, the partial pressure value obtained can be different.
AC impedence method is adopted to measure solution resistance more accurate: because the DC impedance of medical test solution is larger, generally be about 1M-10M, employing AC impedence method is measured, its AC impedance is about 1K-20K, and the resistance of reference resistance matches, this resistance is more prone to realize high-precision measurement.
Signal acquisition control system 18 is connected with described reference resistance 16 with second channel change-over switch 15 with described first passage change-over switch 14, for completing the conversion of voltage signal, collection, the function such as process and control.Preferred implementation is: the AC signal that dividing potential drop obtains by signal conversion sends into precise rectification circuit, converts rear output direct current signal; Direct current signal is converted to digital signal by signals collecting, gives CPU process; After CPU collects the digital signal after conversion, Treatment Analysis, and make corresponding control.
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.As shown in Figure 2, another embodiment schematic diagram of the device that a kind of fluid path position of the present invention is detected, specifically describes as follows:
Described signal acquisition control system 18 also comprises further:
Extracting liquid control module 207, is connected with described pumping device 11, for controlling pumping device 11 extracting liquid;
Change-over switch control module 201, is connected with second channel change-over switch 15 with described first passage change-over switch 14, for controlling described first passage change-over switch 14 and second channel change-over switch 15 switches in scheduled duration interval;
Precision rectifying unit 202, is connected with second channel change-over switch 15 with described first passage change-over switch 14, and the AC signal for dividing potential drop being obtained converts rear output direct current signal;
AD conversion unit 203, is connected with described precision rectifying unit 202, for analog DC signal is converted to digital signal;
Electrode pair impedance computation unit 204, is connected with described AD conversion unit 203, for the second electrode pair 12 described in calculating according to the digital signal after conversion and the resistance value of the first electrode pair 13;
First electrode pair impedance threshold judging unit 205, is connected with extracting liquid control module 207 with described electrode pair impedance computation unit 204, for judging whether the resistance value of the first described electrode pair 13 exceedes presetting threshold value;
Second electrode pair impedance threshold judging unit 206, be connected with extracting liquid control module 207 with described electrode pair impedance computation unit 204, first electrode pair impedance threshold judging unit 205, for judging whether the resistance value of the second described electrode pair 13 exceedes presetting threshold value;
So far, can the collection of complete pair signals and control, certainly can also preferably include:
Abnormal prompt and alarm unit 207, be connected with the second electrode pair impedance threshold judging unit 206 with the first described electrode pair impedance threshold judging unit 205, for when the first described electrode pair and the second electrode pair resistance value exceed presetting threshold value, carry out abnormal information output and warning;
As shown in Figure 3, an enforcement illustration of the method for a kind of fluid path of the present invention position detection specifically describes as follows:
301, two pairs of electrodes are placed respectively at two assigned addresses of fluid path pipeline;
According to the difference that different fluid analysis demands and liquid capacity are selected, select conveniently to carry out detecting two positions detected position in fluid path pipeline, the modes of emplacement of electrode is various, also by PCB printed circuit board (PCB) making electrode and enclosing in pipeline;
302, by the switching of two switches in scheduled duration, two pairs of electrodes being connected with AC impedance testing circuit respectively, calculating the resistance value of two pairs of electrodes by gathering partial pressure value respectively;
According to the switching by switch, two electrode pairs are connected with signal acquisition and controlling system with reference resistance, alternating message source respectively, by the rectification to voltage division signal, analog to digital conversion, calculate the resistance value of two electrode pairs;
303, pumping device extracting liquid is controlled;
Transmit control signal, drive drawing liquid pump work;
304, do you judge that the resistance value closer to the first electrode pair of inlet is being preset within the scope of the first impedance threshold?
After extracting liquid, the direction of liquid feed liquor is considered, first detect be positioned at the first electrode pair near inlet resistance value whether in the scope of presetting general medical detection solution resistance value, in this way within the scope of this, then prove not be not extracted into liquid and be extracted into correct liquid, enter next step process; As no, then need to return step 303, continue drawing liquid;
305, do you judge that the resistance value of the second electrode pair is being preset within the scope of the first impedance threshold?
After the first electrode pair is drawn into correct testing liquid, need to detect the resistance value of the second electrode pair on assigned address further, whether in the scope of presetting general medical detection solution resistance value, in this way within the scope of this, then prove not be not extracted into liquid and be extracted into correct liquid, enter next step process; As no, then need to return step 303, continue drawing liquid;
306, stop drawing liquid and carry out fluid analysis process;
After satisfied as above two conditions, Liquid extracting is normal, and extraction amount reaches requirement, next just can stop drawing liquid, carry out specific liquid correlation analysis and process.Because electrochemical reaction is easily subject to the impact of external circuitry, need switch 14 and 15 to disconnect after drawing liquid completes, avoid the circuit of signal acquisition control system 18 to affect electrochemical reaction.Now chemical reaction can be started.
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.As shown in Figure 4, another embodiment schematic diagram of the method that a kind of fluid path position of the present invention is detected, specifically describes as follows:
401, two pairs of electrodes are placed respectively at two assigned addresses of fluid path pipeline;
According to the difference that different fluid analysis demands and liquid capacity are selected, select conveniently to carry out detecting two positions detected position in fluid path pipeline, the modes of emplacement of electrode is various, also by PCB printed circuit board (PCB) making electrode and enclosing in pipeline;
402, by the switching of two switches in scheduled duration, two pairs of electrodes being connected with AC impedance testing circuit respectively, calculating the resistance value of two pairs of electrodes by gathering partial pressure value respectively;
According to the switching by switch, two electrode pairs are connected with signal acquisition and controlling system with reference resistance, alternating message source respectively, by the rectification to voltage division signal, analog to digital conversion, calculate the resistance value of two electrode pairs;
403, pumping device extracting liquid is controlled;
Transmit control signal, drive drawing liquid pump work;
404, do you judge that the resistance value closer to the first electrode pair of inlet is being preset within the scope of the first impedance threshold?
After extracting liquid, the direction of liquid feed liquor is considered, first detect be positioned at the first electrode pair near inlet resistance value whether in the scope of presetting general medical detection solution resistance value, in this way within the scope of this, then prove not be not extracted into liquid and be extracted into correct liquid, enter next step 407 process; As no, then need to enter step 405;
405, do you judge that the resistance value of the first electrode pair is being preset within the scope of the second impedance threshold?
In general, if have bubble coated electrode to upper, or when electrode pair does not have a contact liq, the AC impedance change of electrode pair is at more than 50K, according to real system test case, the second impedance threshold scope that sets judges, if within the scope of this, then judge there is bubble coated electrode to upper, or electrode pair does not have contact liq, return step 403 and continue extracting liquid (bubble can be taken away), certainly can also be preferably, if all detect that in scheduled duration the resistance value of the first electrode pair is being preset within the scope of the second impedance threshold, then enter step 406 to carry out reporting to the police and abnormal prompt, if not within the scope of this, be then likely the liquid that the liquid extracted not is preset, enter step 406,
406, warning and abnormal prompt;
The warning of acousto-optic and/or the display, storage, printing etc. of information are carried out to the abnormal conditions occurred;
407, do you judge that the resistance value of the second electrode pair is being preset within the scope of the first impedance threshold?
After the first electrode pair is drawn into correct testing liquid, need to detect the resistance value of the second electrode pair on assigned address further, whether in the scope of presetting general medical detection solution resistance value, in this way within the scope of this, then prove not be not extracted into liquid and be extracted into correct liquid, enter next step 409 process; As no, then need to enter step 408;
408, do you judge that the resistance value of the second electrode pair is being preset within the scope of the second impedance threshold?
In general, if have bubble coated electrode to upper, or when electrode pair does not have a contact liq, the AC impedance change of electrode pair is at more than 50K, and according to real system test case, the second impedance threshold scope that sets judges, if within the scope of this, then judge there is bubble coated electrode to upper, or electrode pair do not have contact liq, returns step 403 and continues extracting liquid (bubble can be taken away); If not within the scope of this, be then likely the liquid that the liquid extracted not is preset, enter step 406; And can step 408 be comprised in the technical scheme that whether exists of step 405.
409, stop drawing liquid and carry out fluid analysis process;
After satisfied as above two conditions, Liquid extracting is normal, and extraction amount reaches requirement, next just can stop drawing liquid, carry out specific liquid correlation analysis and process.Because electrochemical reaction is easily subject to the impact of external circuitry, need switch 14 and 15 to disconnect after drawing liquid completes, avoid the circuit of signal acquisition control system 18 to affect electrochemical reaction.Now chemical reaction can be started.
the foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1.
the device that fluid path position is detected, is characterized in that, comprising:
fluid path pipeline;
pumping device, is connected with described fluid path pipeline, for extracting the solution of described fluid path pipeline inlet;
the first electrode pair detected for fluid path position and the second electrode pair, be positioned over two assigned addresses of described fluid path pipeline, the electrode diameter of described each electrode pair is 0.1mm ~ 1mm, between two electrodes of each electrode pair, distance range is 0.5mm ~ 2cm, and electrode surface is gold-plated and scribble hydrophilic chemistries medicine;
first passage change-over switch and second channel change-over switch, be connected with described two electrode pairs respectively, for switching the resistance value of the second electrode pair described in collection and the first electrode pair;
reference resistance, is connected with second channel change-over switch with described first passage change-over switch, for providing partial pressure value for subsequent calculations electrode pair resistance value;
alternating message source, is connected with described reference resistance, for provide for the impedance detection circuit of described electrode pair one ac-excited;
signal acquisition control system, is connected with described reference resistance with described first passage change-over switch, second channel change-over switch, for completing the conversion of voltage signal, collection and subsequent treatment and control.
2.
the device that a kind of fluid path position according to claim 1 is detected, it is characterized in that, described signal acquisition control system comprises,
extracting liquid control module, is connected with described pumping device, for controlling pumping device extracting liquid;
change-over switch control module, is connected with second channel change-over switch with described first passage change-over switch, for controlling described first passage change-over switch and second channel change-over switch switches in scheduled duration interval;
precision rectifying unit, is connected with second channel change-over switch with described first passage change-over switch, and the AC signal for dividing potential drop being obtained converts rear output direct current signal;
aD conversion unit, is connected with described precision rectifying unit, for analog DC signal is converted to digital signal;
electrode pair impedance computation unit, is connected with described AD conversion unit, for the second electrode pair described in calculating according to the digital signal after conversion and the resistance value of the first electrode pair;
first electrode pair impedance threshold judging unit, is connected with extracting liquid control module with described electrode pair impedance computation unit, for judging whether the resistance value of the first described electrode pair exceedes presetting threshold value;
second electrode pair impedance threshold judging unit, is connected with extracting liquid control module with described electrode pair impedance computation unit, the first electrode pair impedance threshold judging unit, for judging whether the resistance value of the second described electrode pair exceedes presetting threshold value.
3.
the device that a kind of fluid path position according to claim 2 is detected, it is characterized in that, described signal acquisition control system also comprises,
abnormal prompt and alarm unit, be connected with the second electrode pair impedance threshold judging unit with the first described electrode pair impedance threshold judging unit, for when the first described electrode pair and the second electrode pair resistance value exceed presetting threshold value, carry out abnormal information output and warning.
4.
the device that a kind of fluid path position according to claim 1 is detected, it is characterized in that, the first described electrode pair and the second electrode pair are produced on PCB printed circuit board (PCB), and are enclosed in described fluid path pipeline.
5.
the method that fluid path position is detected, is characterized in that, comprise the steps:
step I, two pairs of electrodes are placed respectively at two assigned addresses of fluid path pipeline, the electrode diameter of described each electrode pair is 0.1mm ~ 1mm, and between two electrodes of each electrode pair, distance range is 0.5mm ~ 2cm, and electrode surface is gold-plated and scribble hydrophilic chemistries medicine;
two pairs of electrodes are connected with AC impedance testing circuit by the switching of two switches in scheduled duration by step II respectively, calculate the resistance value of two pairs of electrodes by gathering partial pressure value respectively;
step III, controls pumping device extracting liquid;
does step IV, judge that the resistance value closer to the first electrode pair of inlet is being preset within the scope of the first impedance threshold? in this way, then enter step V, as no, then return step III;
does step V, judge that the resistance value of the second electrode pair is being preset within the scope of the first impedance threshold? in this way, then enter step VI, as no, then return step III;
step VI, stops drawing liquid and carries out fluid analysis process.
6.
the method that a kind of fluid path position according to claim 5 is detected, it is characterized in that, described step IV, when judging that the resistance value closer to the first electrode pair of inlet is not when presetting within the scope of the first impedance threshold, also comprise, do you judge that the resistance value of the first electrode pair is being preset within the scope of the second impedance threshold? in this way, then step III is returned.
7.
the method that a kind of fluid path position according to claim 6 is detected, is characterized in that, as judged, the resistance value of the first electrode pair is not presetting within the scope of the second impedance threshold, then carry out reporting to the police and abnormal prompt.
8.
the method that a kind of fluid path position according to claim 5 or 6 is detected, it is characterized in that, described step V, when the resistance value of judgement second electrode pair is not when presetting within the scope of the first impedance threshold, also comprise, do you judge that the resistance value of the second electrode pair is being preset within the scope of the second impedance threshold? in this way, then step III is returned.
9.
the method that a kind of fluid path position according to claim 8 is detected, is characterized in that, as judged, the resistance value of the second electrode pair is not presetting within the scope of the second impedance threshold, then carry out reporting to the police and abnormal prompt.
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| CN109443486B (en) * | 2018-10-25 | 2021-04-27 | 中国船舶重工集团公司第七一九研究所 | Threshold self-adaptive electrical contact water level detection method and detection device |
| CN113252146A (en) * | 2021-05-13 | 2021-08-13 | 宁波水表(集团)股份有限公司 | Intelligent flow velocity simulation system |
| CN113984138B (en) * | 2021-09-10 | 2023-09-05 | 中国航空工业集团公司西安航空计算技术研究所 | Aviation fuel measurement system based on FFT (fast Fourier transform) spectrum analysis |
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| CN1127628A (en) * | 1995-01-28 | 1996-07-31 | 中国医学科学院基础医学研究所 | Organism body fluid distribution measuring analyzer |
| CN2415346Y (en) * | 2000-03-29 | 2001-01-17 | 华南理工大学 | Single chip microcomputer controlled earth dam moisture permeating line scan tester for reserver |
| JP2003291367A (en) * | 2002-04-02 | 2003-10-14 | Sony Corp | Device for displaying remaining amount of liquid |
| JP3849867B2 (en) * | 2002-07-24 | 2006-11-22 | ソニー株式会社 | Liquid detection device and liquid amount detection device |
| FR2847340B1 (en) * | 2002-11-15 | 2005-02-25 | Jacques Morineau | METHOD FOR MEASURING THE HEIGHT OF A LIQUID USING A HIGH FREQUENCY LINE PROBE AND PROBE USED |
| CN2715268Y (en) * | 2004-05-18 | 2005-08-03 | 王兰泽 | Sewage conduit monitor |
| CN101498598A (en) * | 2009-03-10 | 2009-08-05 | 珠海市德莱环保科技有限公司 | Wireless security monitoring system for large dam |
| CN101614573B (en) * | 2009-04-28 | 2011-05-18 | 北京宝力马传感技术有限公司 | Soaking monitoring method, device and equipment |
| CN102200463A (en) * | 2011-03-23 | 2011-09-28 | 泰州市瑞芝电子有限公司 | Liquid level linear measurement method based on impedance measurement |
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