CN204988391U - Axis spreads sensilla - Google Patents
Axis spreads sensilla Download PDFInfo
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- CN204988391U CN204988391U CN201520802138.3U CN201520802138U CN204988391U CN 204988391 U CN204988391 U CN 204988391U CN 201520802138 U CN201520802138 U CN 201520802138U CN 204988391 U CN204988391 U CN 204988391U
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- signal
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- plant stem
- temperature
- flow sensor
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Abstract
The utility model relates to an axis spreads sensilla especially relates to the axis spreads sensilla that the interference killing feature is high. The utility model discloses an axis spreads sensilla includes that at least one is arranged in inserting the probe of plant stem and is used for following signal that the probe obtained carries out the signal processor that handles, be provided with heating element and temperature element in the probe, wherein, heating element is right at the during operation temperature element heats and stop the heating after reaching the predetermined temperature, temperature element produces the signal of telecommunication according to the temperature that detects, signal processor gathers temperature element produces the signal of telecommunication is right the signal of telecommunication is handled, makes the signal of telecommunication becomes the data signal of predetermined format.
Description
Technical field
The utility model relates to a kind of plant stem flow sensor, particularly relates to the plant stem flow sensor that a kind of antijamming capability is high.
Background technology
Measure trees trunk in water flow (hreinafter referred to as " stemflow ") time, need to use plant stem flow sensor.A kind of plant stem flow sensor common is at present the Granier dissipation of heat probe proposed in the eighties in last century by Frenchman Granier.This dissipation of heat probe is on the basis of thermal pulse liquid stream determination techniques, make use of the principle that double-thermocouple detects heat dissipation.
A kind of Usual examples of Granier dissipation of heat probe has been shown in Fig. 1.Granier dissipation of heat probe shown in Fig. 1 comprises the thermocouple probe that two have employed aluminum probe form, a thermocouple probe built-in electric heater wherein.
When measuring stemflow, two probes are inserted in the sapwood of trunk one on the other, wherein, a probe of built-in electric heater upper and be heated to predetermined temperature in advance before measuring, another root probe lower as reference.Measure heating after probe (probe upper) with reference probe (under probe) between temperature difference △ T.When liquid flows upwards in plant sapwood, take away the heat in probe, make the temperature difference △ T between upper and lower two probes be reduced to 0 gradually.
Existence function relation between stemflow in the temperature difference and sapwood, this funtcional relationship can referred to as Granier model.According to temperature difference during zero stemflow and the temperature difference recorded, application Granier model, directly can obtain the Stemflow Rate in each moment, more just can obtain stemflow flux according to sapwood area.
But the signal that this existing Granier dissipation of heat probe produces is very faint thermopair millivolt signal, be maximumly no more than 2.5 millivolts, be very easily subject to the interference of ambient signal.Such as, the cable length that probe connects is longer, and the Signal transmissions decay in circuit more easily causes obvious interference, causes distorted signals, thus cannot obtain enough accurate measurement result.Therefore, this existing antijamming capability that have employed the measuring equipment of Granier dissipation of heat probe is very weak.
Utility model content
The utility model is a kind of plant stem flow sensor, which employs the probe that is built-in with well heater and temperature element, and the measuring-signal obtained from probe can be treated to the digital signal of predetermined format, thus the defect that the two probes overcoming traditional thermojunction type are easily interfered.
Plant stem flow sensor of the present utility model comprises at least one for inserting the probe in plant stem and the signal processing part for processing the signal obtained from described probe, heating element and temperature element is provided with in described probe, wherein, described heating element operationally heats described temperature element and stops heating after reaching a defined temperature, and described temperature element produces electric signal according to detected temperature; Described signal processing part gathers the described electric signal of described temperature element generation and processes described electric signal, makes described electric signal become the digital signal of predetermined format.
Preferably, described Electric signal processing is become the digital signal of SDI-12 form by described signal processing part.
Preferably, described probe is many, and these many probes are connected with same signal processing part independently of one another.
Preferably, described heating element is electric heater.
Preferably, described plant stem flow sensor also comprises the data processing division be connected with described signal processing part signal, and described data processing division calculates by the Stemflow Rate of measuring plants according to the digital signal after described signal processing part process.
Accompanying drawing explanation
Fig. 1 is the exemplary plot of existing Granier dissipation of heat probe.
Fig. 2 is the tactic pattern figure of plant stem flow sensor of the present utility model.
Description of reference numerals:
100. signal processing part; 200. probe; 21. electric heaters; 22. temperature elements; 23. probe case; 201. heating line; 202. data-signal circuits.
Embodiment
Illustrative embodiments of the present utility model is described in detail hereinafter with reference to accompanying drawing.In the following embodiments, in order to the convenience illustrated, using trees as the example of plant, and using the stemflow in the sapwood of trees as measuring object.
First embodiment
Existing Granier dissipation of heat probe has been shown in Fig. 1.First embodiment of plant stem flow sensor of the present utility model has been shown in Fig. 2.
Granier dissipation of heat probe measurement in Fig. 1 be stemflow in the sapwood of trees, the flow direction of stemflow flows from bottom to top as the parallel arrow of four in Fig. 1 is depicted as.The plant stem flow sensor of the present embodiment shown in Fig. 2 is also for measuring the stemflow in the sapwood of trees as shown in Figure 1.
The plant stem flow sensor of present embodiment has signal processing part 100 and a probe 200.Probe 200 for insert trees sapwood in the temperature of stemflow is detected.Signal processing part 100 is such as single-chip microcomputer, microprocessor chip, CPU or other there is the circuit of signal processing function, for processing the signal obtained from probe 200.Signal processing part 100 and probe 200 is described in detail below in conjunction with Fig. 2.
As shown in Figure 2, probe 200 comprises shell 23 and the electric heater 21 that is arranged in shell 23 and temperature element 22.Shell 23 can be by the metal needle-like cylindrical shell such as stainless steel or aluminium, but is not limited thereto, and also can be that other are applicable to the shapes in insertion trees sapwood or select other to be applicable to inserting the material in trees sapwood.Electric heater 21 is electrically connected with signal processing part 100 by heating line 201, and temperature element 22 is connected with signal processing part 100 signal by data-signal circuit 202.
In the occasion detected the stemflow in trees sapwood, first probe 200 is inserted in the sapwood of trees, then control electric heater 21 by signal processing part 100 and start heating, and by temperature element 22 detected temperatures.Temperature element 22 produces the electric signal corresponding with the temperature detected.When temperature element 22 detects that temperature reaches predetermined value, electric heater 21 stops heating.
Because the stemflow in sapwood constantly can take away the heat of probe 200, thus the electric signal that temperature element 22 produces reflect temperature on probe 200 in time through and constantly reduce until the process identical with the temperature of stemflow.Signal processing part 100 constantly gathers the electric signal of temperature element 22 generation via signal line 202, and collected electric signal processes by signal processing part 100, the electric signal that temperature element 22 is produced is processed to be the digital signal of SDI-12 form.
The faint simulating signal of less than 2.5 millivolts that what the Granier dissipation of heat probe shown in Fig. 1 produced is, and in present embodiment, processed the signal into digital signal.Compared with simulating signal, the antijamming capability of digital signal significantly strengthens, and is therefore not easy the interference being subject to ambient signal.Particularly when adopting long cable transmission signal, the transmission attenuation in cable has influence on the correct transmission of digital signal hardly.Therefore the antijamming capability of present embodiment is high.
Above-mentioned SDI-12 form is the communication standard of a kind of serial digital interface (SerialDigitalInterface), and it is a kind of serial data communication interface protocol, obtains in recent years and use widely in environmental monitoring.This technology is widely used in earth environment monitoring, cultivation and the food productions such as industrial or agricultural multiparameter measurement and control, the hydrology of rivers,lakes and seas and meteorology, can long-distance transmission data.
Signal processing part 100 can be connected with not shown data processing division signal, so that the signal that data processing division sends according to signal processing part 100 calculates plant stem flow.This data processing division can be the universal external data processing device of such as computer or mobile phone etc., also can be special circuit or the specialized equipment with data processing function.Or, this data processing division and signal processing part 100 can be become one.
As mentioned above, the temperature detected by probe 200 is actually a temperature curve, its temperature that can reflect probe 200 in time through and constantly reduce until the process identical with the temperature of stemflow.Therefore, temperature difference △ T can be calculated equally according to this temperature curve, thus Granier model can be applied calculate by the Stemflow Rate of measuring plants.
Second embodiment (not shown)
The difference of present embodiment and the first embodiment is, many probes 200 are connected with same signal processing part 100 independently of one another.Signal processing part 100 can process the signal of every root probe 200 respectively, and exports digital signal corresponding with every root probe 200 respectively.Like this, only need to increase a small amount of operation of many probes 200 being inserted respectively different trees, just can detect the stemflow in many trees simultaneously, thus significantly improve the efficiency of many trees being carried out to stemflow measurement.
Other aspects of present embodiment are identical with the first embodiment, thus repeat no more.
One of ordinary skill in the art will readily recognize that the heating of electric heater 21 is not only insert after in the sapwood of trees at probe 200 just to start, but also can heat insert the sapwood of trees at probe 200 before or when inserting.The heating of electric heater 21 is not limited to carry out by signal processing part 100 mode that controls in the first embodiment, also can be controlled by other equipment, or by its heating of operator's Non-follow control with stop.Electric heater 21 also can be substituted by the well heater of other types, as long as this well heater can stop heating after probe 200 is heated to predetermined temperature.In addition, above-mentioned signal is also not limited to the digital signal being treated to SDI-12 form, and the form of the transmission of other data or process can be suitable for too.Therefore, embodiment described above is only exemplary, and is not intended to carry out any restriction to the utility model.
Although describe the utility model with reference to illustrative embodiments, should be appreciated that the utility model is not limited to disclosed illustrative embodiments.One of ordinary skill in the art will readily recognize that on the basis of claims, when not deviating from purport of the present utility model and spirit, various modification and equivalent replacement can be carried out.Therefore, the scope of claims should meet the most wide in range explanation, to comprise all modification, equivalent structure and function.
Claims (5)
1. a plant stem flow sensor, described plant stem flow sensor comprises at least one and it is characterized in that for inserting the probe in plant stem and the signal processing part for processing the signal obtained from described probe,
Be provided with heating element and temperature element in described probe, wherein, described heating element operationally heats described temperature element and stops heating after reaching a defined temperature, and described temperature element produces electric signal according to detected temperature;
Described signal processing part gathers the described electric signal of described temperature element generation and processes described electric signal, makes described electric signal become the digital signal of predetermined format.
2. plant stem flow sensor according to claim 1, is characterized in that,
Described Electric signal processing is become the digital signal of SDI-12 form by described signal processing part.
3. plant stem flow sensor according to claim 1 and 2, is characterized in that,
Described probe is many, and these many probes are connected with same signal processing part independently of one another.
4. plant stem flow sensor according to claim 1, is characterized in that,
Described heating element is electric heater.
5. plant stem flow sensor according to claim 1 and 2, is characterized in that,
Described plant stem flow sensor also comprises the data processing division be connected with described signal processing part signal, and described data processing division calculates by the Stemflow Rate of measuring plants according to the digital signal after described signal processing part process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520802138.3U CN204988391U (en) | 2015-10-13 | 2015-10-13 | Axis spreads sensilla |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520802138.3U CN204988391U (en) | 2015-10-13 | 2015-10-13 | Axis spreads sensilla |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204988391U true CN204988391U (en) | 2016-01-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520802138.3U Expired - Fee Related CN204988391U (en) | 2015-10-13 | 2015-10-13 | Axis spreads sensilla |
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| CN (1) | CN204988391U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110568020A (en) * | 2019-09-12 | 2019-12-13 | 安徽农业大学 | Plant liquid flow monitoring device and method |
| CN110596183A (en) * | 2019-09-30 | 2019-12-20 | 西北农林科技大学 | Stem flow signal acquisition node and heat source self-adaptive stem flow measuring system based on temperature compensation and using same |
-
2015
- 2015-10-13 CN CN201520802138.3U patent/CN204988391U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110568020A (en) * | 2019-09-12 | 2019-12-13 | 安徽农业大学 | Plant liquid flow monitoring device and method |
| CN110596183A (en) * | 2019-09-30 | 2019-12-20 | 西北农林科技大学 | Stem flow signal acquisition node and heat source self-adaptive stem flow measuring system based on temperature compensation and using same |
| CN110596183B (en) * | 2019-09-30 | 2024-03-12 | 西北农林科技大学 | Stem flow signal acquisition node and heat source self-adaptive stem flow measurement system based on temperature compensation and using same |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160120 Termination date: 20161013 |
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| CF01 | Termination of patent right due to non-payment of annual fee |