CN103398754A - Three-in-one sensor - Google Patents
Three-in-one sensor Download PDFInfo
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- CN103398754A CN103398754A CN201310294623XA CN201310294623A CN103398754A CN 103398754 A CN103398754 A CN 103398754A CN 201310294623X A CN201310294623X A CN 201310294623XA CN 201310294623 A CN201310294623 A CN 201310294623A CN 103398754 A CN103398754 A CN 103398754A
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Abstract
The invention provides a three-in-one sensor which comprises a sensing chip and a control panel connected with the sensing chip. The sensing chip comprises an internal sensing electrode and an external sensing electrode which are distributed at an interval. The control panel comprises a CPU (central processing unit) main control unit, a first sensing interface and a second sensing interface. The CPU main control unit comprises a water-resistance type sensing and detecting module, an impulse type sensing and detecting module and an electric-field type sensing and detecting module. One end of the first sensing interface is connected with the external sensing electrode while the other end of the same is connected with the water-resistance type sensing and detecting module and the impulse type sensing and detecting module. One end of the second sensing interface is connected with the internal sensing electrode while the other end of the same is connected with the electric-field type sensing and detecting module. Two sensing electrodes are adopted to collect liquid level signal data, and three different principles are adopted to detect the collected liquid level signal data, so that complementation of advantages of sensing techniques with different principles is realized, and at least one method can be adopted by the sensor to accurately detect water level under bad conditions.
Description
Technical field
The invention belongs to sensor technical field, be specifically related to a kind of three-in-one sensor, refer in particular to the three-in-one sensor for the solar water heater liquid level monitoring.
Background technology
Along with sensor technology is advanced by leaps and bounds, this technology is extended to field of water heaters for liquid level monitoring.Known sensor mainly comprises three kinds, i.e. water resistance type sensor, electric field sensor and pulse sensor.Above-mentioned three kinds of sensors all can play the effect of liquid level monitoring, but three kinds of sensors all have quality in actual application.
The water resistance type sensor, namely utilize external induction electrode, by the resistance of direct test water, carries out water level detecting.This sensor is generally adopted by institute of solar water heater manufacturer because of with low cost and making simply always, but external induction electrode contacts easily formation incrustation scale due to long-time with water, thereby causes the resistance of testing data distortion, so that judges water level by accident.
Electric field sensor, utilize electric field induction principle, is about to induction electrode built-in, makes induction electrode without in the situation with liquid contacts, and can accurately measure water level.This kind sensor efficiently solves the deficiency of the easy sediment incrustation of electrode of water resistance type sensor existence, but induction electrode is owing to not contacting with water, therefore the water resistance of its clad material is had to higher requirement.Yet at present the serviceable life of clad material is generally lower on the market, can't guarantee that it still can isolate moisture and contact with induction electrode under the immersion of high-temperature water.In addition, electric field sensor is subject to the interference of surrounding enviroment electric field signal and reduces the precision of test.
Pulse sensor, induction electrode is external and utilize pulse theory to measure water level.This sensor is not affected by electric field signal, and range of application is wider, but, when the vapour concentration in water tank is higher, but is difficult to accurately judge water level.
In view of above three class sensors quality separately, how to maximize favourable factors and minimize unfavourable ones, realize the mutual supplement with each other's advantages between different sensors, guarantee that the sensor for liquid level monitoring is this area urgent problem in different conditions down to accurately measuring water level eventually.
Summary of the invention
The objective of the invention is to overcome weak point of the prior art, a kind of three-in-one sensor is provided, thus the precision of the monitoring of flooding.
The objective of the invention is to be achieved through the following technical solutions:
three-in-one sensor, comprise sensing core bar and the control panel that is connected with sensing core bar, described sensing core bar comprises built-in sensitive electrode and the external induction electrode that distributes alternately, described control panel comprises the CPU main control unit, the first sensing interface and the second sensing interface, described CPU main control unit comprises water resistance type sensing detection module, pulsed sensing detection module and Electric field sensing detection module, one end of the first sensing interface is connected with external induction electrode, the other end is connected with pulsed sensing detection module with water resistance type sensing detection module respectively, one end of the second sensing interface is connected with the built-in sensitive electrode, the other end is connected with Electric field sensing detection module.
One of main innovate point of the present invention is: utilize two kinds of induction electrodes to gather the liquid level signal data, adopt three kinds of different principles to detect the liquid level signal data that gather, realized the mutual supplement with each other's advantages between the different principle sensing technology, guarantee under mal-condition, sensor can adopt at least a mode accurately to measure water level.
Main innovate point of the present invention also is: the sensing interface for water resistance type sensing detection module and pulsed sensing detection module is same sensing interface, and all with identical external induction electrode, gather the liquid level signal data, simplify the structure of sensor, saved production cost.
In order to make sensor of the present invention except level monitoring, also can be used for the water temperature monitoring, as improving technical scheme, the inventor is provided with a thermistor in described arbitrary built-in sensitive electrode interior, described CPU main control unit also comprises a temperature detecting module, one end of the second sensing interface is connected with thermistor, and the other end is connected with temperature detecting module.
In order to guarantee that thermistor can accurately gather water temperature signal, the described built-in sensitive electrode that is built-in with thermistor is preferably placed at the axial middle part of sensing core bar.
As further improvement technical scheme, described control panel also comprises the DC-DC unit and for the unibus communication interface of power supply input and detection signal output.
Concrete, described CPU main control unit comprises a microprocessor, described water resistance type sensing detection module, pulsed sensing detection module, Electric field sensing detection module and temperature detecting module are positioned at microprocessor internal, and in the microprocessor outer setting corresponding pin.
Concrete, described the first sensing interface comprises a plurality of ports, one end and the external induction electrode of each port connect one to one, except the other end of first section external induction electrode corresponding ports only a pin corresponding with pulsed sensing detection module connects, the other end of all the other ports is connected with the water resistance type sensing detection module pin corresponding with pulsed sensing detection module respectively.
Concrete, described the second sensing interface comprises a plurality of ports, one end and the built-in sensitive electrode of part port connect one to one, the pin that the other end is corresponding with Electric field sensing detection module connects, one end of remaining port is connected with thermistor, and the pin that the other end is corresponding with temperature detecting module connects.
The present invention has the following advantages and beneficial effect compared to existing technology:
(1) the present invention utilizes two kinds of induction electrodes to gather the liquid level signal data, adopt three kinds of different principles to detect the liquid level signal data that gather, realized the mutual supplement with each other's advantages between the different principle sensing technology, guarantee under mal-condition, sensor can adopt at least a mode accurately to measure water level;
(2) the sensing interface for water resistance type sensing detection module and pulsed sensing detection module is same sensing interface, and all with identical external induction electrode, gathers the liquid level signal data, has simplified the structure of sensor, has saved production cost;
(3) sensor of the present invention is except providing three kinds of different liquid level detection modes, also possesses the water temperature measuring ability, and the sensing interface for temperature detecting module and Electric field sensing detection module is same sensing interface, has further simplified the structure of sensor, has saved production cost;
(4) the present invention adopts unibus communication, and the liquid level testing result of three kinds of modes is independently exported, and does not interfere with each other;
(5) sensor construction provided by the invention is simple and easy to realize, and three kinds of serviceable lifes that the water level detecting mode that combines has improved sensor.
The accompanying drawing explanation
Fig. 1 is the present embodiment three-in-one sensor structured flowchart.
Fig. 2 is the structure cut-open view of the present embodiment sensing core bar.
Fig. 3 is the principle schematic of the present embodiment control panel.
Embodiment
The present invention is described in further detail below in conjunction with embodiment and accompanying drawing, but the embodiment of the invention is not limited to this.
as shown in Figure 1, three-in-one sensor, comprise sensing core bar and the control panel that is connected with sensing core bar, sensing core bar comprises the built-in sensitive electrode that distributes alternately, external induction electrode and the thermistor that is positioned at a built-in sensitive electrode interior, control panel comprises the unibus communication interface, the DC-DC unit, the CPU main control unit, the first sensing interface and the second sensing interface, wherein: the CPU main control unit comprises a microprocessor, water resistance type sensing detection module, pulsed sensing detection module, Electric field sensing detection module and temperature detecting module are positioned at microprocessor internal, one end of the first sensing interface is connected with external induction electrode, the other end is connected with pulsed sensing detection module with water resistance type sensing detection module respectively, one end of the second sensing interface is connected with thermistor with the built-in sensitive electrode respectively, the other end is connected with temperature detecting module with Electric field sensing detection module respectively.
The effect of above-mentioned each ingredient of three-in-one sensor is as follows:
Built-in sensitive electrode, external induction electrode, be used to gathering the liquid level signal data;
Thermistor, be used to gathering the water temperature signal data;
Water resistance type sensing detection module, the liquid level signal data analysis that utilizes the water resistance principle to gather external induction electrode, and output detections result;
Pulsed sensing detection module, the liquid level signal data analysis that utilizes pulse theory to gather external induction electrode, and output detections result;
Electric field sensing detection module, the liquid level signal data analysis that utilizes principle of electric field to gather built-in induction electrode, and output detections result;
Temperature detecting module, receive the water temperature signal data of thermistor transmission and analyze the output detections result;
The unibus communication interface, as the port of probe power input and the port of liquid level and water temperature signal output;
The DC-DC unit, form safe voltage for the CPU main control unit after will carrying out transformation through the external voltage of unibus communication interface input.
Below in conjunction with Fig. 2 and Fig. 3, be specifically described.
as shown in Figure 2, the core bar of the present embodiment three-in-one sensor comprises five external induction electrodes and four built-in sensitive electrodes, this core bar implements to be placed at present water tank in reality, namely from water tank bottom, insert water tank, according under from upper order, induction electrode is followed successively by the first external induction electrode 1, the first built-in sensitive electrode 6, the second external induction electrode 2, the second built-in sensitive electrode 7, the 3rd external induction electrode 3, the 3rd built-in sensitive electrode 8, puts induction electrode 4 all round, the 4th built-in sensitive electrode 9 and the 5th external induction electrode 5, the second built-in sensitive electrode 7 inside are provided with a thermistor 10.
As shown in Figure 3, in the present embodiment the outer setting of microprocessor the pin corresponding with water resistance type sensing detection module, pulsed sensing detection module, Electric field sensing detection module and temperature detecting module.Wherein:
Pin corresponding to water resistance type sensing detection module comprises four, be respectively AD1 pin, AD2 pin, AD3 pin and AD4 pin, the first sensing interface comprises five ports, wherein have an end of four ports with AD1 pin, AD2 pin, AD3 pin and AD4 pin, to connect one to one respectively, the other end of these four ports with the external induction electrode 3, of the second external induction electrode the 2, the 3rd shown in Figure 2, puts all round induction electrode 4 respectively and the 5th external induction electrode 5 connects one to one (with the first external induction electrode 1 that is positioned at first fragment position, not being connected).The water resistance type principle is as follows to the flow process that liquid level detects: when the liquid level of water tank arrived the second external induction electrode 2, the resistance of AD1 pin changed, and water resistance type sensing detection module judges that by analysis the liquid level of this moment is 25%; When the liquid level of water tank arrived the 3rd external induction electrode 3, the resistance of AD2 pin changed, and water resistance type sensing detection module judges that by analysis the liquid level of this moment is 50%; When the liquid level of water tank arrives the while putting induction electrode 4 all round, the resistance of AD3 pin changes, and water resistance type sensing detection module judges that by analysis the liquid level of this moment is 75%; When the liquid level of water tank arrived the 5th external induction electrode 5, the resistance of AD4 pin changed, and water resistance type sensing detection module judges that by analysis the liquid level of this moment is 100%.
Pin corresponding to pulsed sensing detection module comprises five, is respectively P1.5 pin, P1.4 pin, P1.3 pin, P1.2 pin and P1.1 pin.One end of five ports that the first sensing interface is included connects one to one with P1.5 pin, P1.4 pin, P1.3 pin, P1.2 pin and P1.1 pin respectively, and the other end of these five ports with the external induction electrode 3, of the external induction electrode the 2, the 3rd of the first external induction electrode 1, second shown in Figure 2, puts all round induction electrode 4 respectively and the 5th external induction electrode 5 connects one to one.The pulsed principle is as follows to the flow process that liquid level detects: pulsed sensing detection module is sent high-frequency impulse (when not sending high-frequency impulse, pulsed sensing detection module is accepting state) by P1.5 pin, P1.4 pin, P1.3 pin, P1.2 pin and P1.1 pin successively; When the liquid level of water tank arrived the second external induction electrode 2, the high-frequency impulse that the first external induction electrode 1 sends was detected by the second external induction electrode 2, and pulsed sensing detection module, by analyzing, is judged as 25% liquid level; When the liquid level of water tank arrived the 3rd external induction electrode 3, the high-frequency impulse that the second external induction electrode 2 sends was detected by the 3rd external induction electrode, and pulsed sensing detection module, by analyzing, is judged as 50% liquid level; When the liquid level of water tank arrives the while putting induction electrode 4 all round, the high-frequency impulse that the 3rd external induction electrode 3 sends is put all round induction electrode 4 by the and is detected, and pulsed sensing detection module, by analyzing, is judged as 75% liquid level; When the liquid level of water tank arrived the 5th external induction electrode 5, the puts the high-frequency impulse that induction electrode 4 sends was all round detected by the 5th external induction electrode, and pulsed sensing detection module, by analyzing, is judged as 100% liquid level.
Pin corresponding to Electric field sensing detection module comprises four, is respectively P20 pin, P21 pin, P22 pin and P23 pin.The second sensing interface comprises six ports, wherein an end of four ports connects one to one with P20 pin, P21 pin, P22 pin and P23 pin respectively, and the other end of these four ports connects one to one with the first built-in sensitive electrode 6, the second built-in sensitive electrode 7, the 3rd built-in sensitive electrode 8 and the 4th built-in sensitive electrode 9 shown in Figure 2 respectively.The Electric field principle is as follows to the flow process that liquid level detects: when liquid level arrives the first built-in sensitive electrode 6, cause the first built-in sensitive electrode 6 electric field change on every side, Electric field sensing detection module is judged as 25% liquid level according to the collection signal data that the P20 pin transmits; When liquid level arrives the second built-in sensitive electrode 7, cause the second built-in sensitive electrode 7 electric field change on every side, Electric field sensing detection module is judged as 50% liquid level according to the collection signal data that the P21 pin transmits; When liquid level arrives the 3rd built-in sensitive electrode 8, cause the 3rd built-in sensitive electrode 8 electric field change on every side, Electric field sensing detection module is judged as 75% liquid level according to the collection signal data that the P22 pin transmits; When liquid level arrives the 4th built-in sensitive electrode 9, cause the 4th built-in sensitive electrode 9 electric field change on every side, Electric field sensing detection module is judged as 100% liquid level according to the collection signal data that the P23 pin transmits.
Pin corresponding to temperature detecting module comprises one, is the P1.0 pin, and in included two other port of the second sensing interface, an end of is connected with this pin, and the other end is connected with thermistor 10 shown in Figure 2.
The above embodiment has only expressed embodiments of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to type the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, under the premise of not departing from the present invention, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (7)
1. three-in-one sensor, comprise sensing core bar and the control panel that is connected with sensing core bar, it is characterized in that: described sensing core bar comprises built-in sensitive electrode and the external induction electrode that distributes alternately, described control panel comprises the CPU main control unit, the first sensing interface and the second sensing interface, described CPU main control unit comprises water resistance type sensing detection module, pulsed sensing detection module and Electric field sensing detection module, one end of the first sensing interface is connected with external induction electrode, the other end is connected with pulsed sensing detection module with water resistance type sensing detection module respectively, one end of the second sensing interface is connected with the built-in sensitive electrode, the other end is connected with Electric field sensing detection module.
2. three-in-one sensor according to claim 1, it is characterized in that: described arbitrary built-in sensitive electrode interior is provided with a thermistor, described CPU main control unit also comprises a temperature detecting module, one end of the second sensing interface is connected with thermistor, and the other end is connected with temperature detecting module.
3. three-in-one sensor according to claim 2, it is characterized in that: the described built-in sensitive electrode that is built-in with thermistor is positioned at the axial middle part of sensing core bar.
4. three-in-one sensor according to claim 1 and 2 is characterized in that: described control panel also comprises the DC-DC unit and for the unibus communication interface of power supply input and detection signal output.
5. three-in-one sensor according to claim 2, it is characterized in that: described CPU main control unit comprises a microprocessor, described water resistance type sensing detection module, pulsed sensing detection module, Electric field sensing detection module and temperature detecting module are positioned at microprocessor internal, and in the microprocessor outer setting corresponding pin.
6. three-in-one sensor according to claim 5, it is characterized in that: described the first sensing interface comprises a plurality of ports, one end and the external induction electrode of each port connect one to one, except the other end of first section external induction electrode corresponding ports only a pin corresponding with pulsed sensing detection module connects, the other end of all the other ports is connected with the water resistance type sensing detection module pin corresponding with pulsed sensing detection module respectively.
7. three-in-one sensor according to claim 6, it is characterized in that: described the second sensing interface comprises a plurality of ports, one end and the built-in sensitive electrode of part port connect one to one, the pin that the other end is corresponding with Electric field sensing detection module connects, one end of remaining port is connected with thermistor, and the pin that the other end is corresponding with temperature detecting module connects.
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| CN108828073A (en) * | 2018-05-21 | 2018-11-16 | 长沙学院 | A kind of acoustic emission detection system based on fiber grating |
| CN114137041A (en) * | 2021-11-18 | 2022-03-04 | 西南石油大学 | Automatic detection device for foam of gas production by foam discharge at well mouth |
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| CN114137041A (en) * | 2021-11-18 | 2022-03-04 | 西南石油大学 | Automatic detection device for foam of gas production by foam discharge at well mouth |
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