CN105278565A - Soilless culture nutrient solution automatic control device and control method - Google Patents
Soilless culture nutrient solution automatic control device and control method Download PDFInfo
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Abstract
The invention discloses a soilless culture nutrient solution automatic control device and a control method. The Soilless culture nutrient solution automatic control device and control method comprises a control end and n terminals used for respectively detecting contents of nutrient compositions in different culture dishes. The control end comprises a housing, and a main controller, a memory and a first wireless transceiver which are arranged in the housing, and a display and an alarm arranged on the housing. Each terminal comprises a housing, and a terminal controller and a second wireless transceiver which are arranged in the housing, and m detection interfaces arranged on the housing. The m detection interfaces are respectively and electrically connected with a PH value sensor and m-1 ion concentration sensors. The main controller is electrically connected with the first wireless transceiver, the display, the memory and the alarm. The soilless culture nutrient solution automatic control device is low in price and is capable of adjusting control function in time according to requirements of automatic control; in addition, the reliability is good, the state is stable, and reliable bases are provided for the healthy growing of plants living on the nutrient solution.
Description
The present invention relates to automatic control technology field, especially relate to a kind of low price, be convenient to adjust soilless culture nutrient solution automaton and the control method of controlling functions in time according to the needs detected.
Background technology
Normally used nutrient solution automaton is external imported product, and costly, function is more for price, and most of function does not need to use, and causes the waste of substantial contribution; Further, cannot according to the needs automatically controlled, increase and decrease corresponding component, cannot adjust controlling functions in time.
Chinese patent mandate publication number: CN201928764U, authorize publication date on August 17th, 2011, disclose a kind of nutrient solution recycling device, comprise one with the cultivation liquid pool of liquid feeding pipeline, also is furnished with automation detection and control device, be provided with the mother liquor tank of one group of holding nutrient solution, the output pipe of each mother liquor tank passes into be cultivated in liquid pool, and the output pipe of each mother liquor tank is provided with the micro pump being controlled by automation detection and control device; Be provided with a water disposal facility, the external tap water pipe line of its entrance, its output pipe passes into be cultivated in liquid pool; Be provided with an apparatus of oxygen supply, its output pipe passes into be cultivated in liquid pool; Cultivation liquid pool mid-enter one group of sensor, this group sensor at least comprises the one in liquid level sensor, dissolved oxygen sensor, PH sensor, EC sensor and temperature sensor; The input end of the output termination automation detection and control device of described each sensor.The weak point of this invention is, automatically cannot control the concentration of each ion in nutrient solution.
Summary of the invention
Goal of the invention of the present invention is expensive in order to overcome nutrient solution monitoring device of the prior art, the deficiency of controlling functions cannot be adjusted according to the automatic needs controlled in time, provide a kind of low price, be convenient to adjust in time according to the needs detected soilless culture nutrient solution automaton and the control method of controlling functions.
To achieve these goals, the present invention is by the following technical solutions:
A kind of soilless culture nutrient solution automaton, comprises control end and n is individual for detecting the terminal of component content in different double dish respectively; Described control end comprises shell, is located at the master controller in shell, storer and the first wireless transceiver, is located at the display on shell and alarm; Each terminal includes housing, is located at the terminal control unit in housing and the second wireless transceiver, and m of being located on housing detects interface; M is detected interface and is electrically connected with pH sensor and m-1 ion concentration sensor respectively; Master controller is electrically connected with the first wireless transceiver, display, storer and alarm respectively; Be equipped with m+2 micro pump above each double dish, wherein, m-1 micro pump is connected with the liquid storage box filling different ions solution respectively, 2 micro pump w
1and w
2be connected with aqueous slkali liquid storage box with acid solution liquid storage box respectively, 1 micro pump w
3be connected with storage box, the second wireless transceiver that each terminal control unit is corresponding with it respectively, m is detected interface and the electrical connection of each micro pump; First wireless transceiver respectively with the second wireless transceiver wireless connections of each terminal.
Each terminal detects the concentration of each ion of nutrient solution in each double dish respectively, each sensor is for detecting the concentration of each ion in nutrient solution, be previously stored with the critical field of each ion in master controller, terminal control unit controls each ion concentration that the second wireless transceiver sends the detection of each sensor in time;
Master controller receives each ion concentration detected by the first wireless transceiver, master controller by detect each ion concentration compared with critical field, when certain ion concentration detected is not in critical field, main controller controls display demonstrates the sequence number of the double dish of ion concentration exception and the title of ion, alarm sends warning message, then carries out nutrient solution concentration and controls and pH control.
Master controller, terminal control unit, alarm, display and each sensor all can adopt conventional model, low price; Different sensors, micro pump can be increased and decreased in time according to the needs automatically controlled, thus the automatic control realized different ions in nutrient solution, when certain ion concentration in certain double dish is abnormal, alarm and display can send the title of alarm sound and display aberrant ion respectively, the micro pump corresponding with this Ion Phase that master controller can control corresponding terminal is opened, thus automatic powder adding adds solution, make each ion concentration of the nutrient solution in double dish all the time in critical field, thus the plant health that dependence nutrient solution is survived growth.
Therefore, the present invention has low price, can adjust controlling functions in time according to the needs automatically controlled, and provides the feature of reliable basis for relying on the growing up healthy and sound of plant of nutrient solution existence.
As preferably, described detection interface is 5, and 5 are detected interfaces and are electrically connected with potassium ion sensor, Sensor of Nitrate Ions, conductor Calcium ion sensor, chlorion sensor and pH sensor respectively.
As preferably, described master controller and terminal control unit are CC2530 single-chip microcomputer, and each sensor is all electrically connected with corresponding detection interface by amplifying circuit.
As preferably, control end also comprises and starts button and stop key, and starts button and stop key all to be electrically connected with master controller.
As preferably, each terminal also comprises switch key and status indicator lamp, and switch key and status indicator lamp are all electrically connected with corresponding terminal control unit.
When terminal is in normal operating conditions, status indicator lamp is green; When terminal is in alarm condition, status indicator lamp is red.
A control method for soilless culture nutrient solution automaton, comprises the steps:
(6-1) pH value critical field [R is stored in storer
1, R
2], the concentration standard scope corresponding with each ion concentration sensor; Nutrition threshold value μ ' is equipped with in each terminal control unit;
(6-2) master controller sends pH value critical field and each concentration standard scope by the first wireless transceiver, and the second wireless transceiver receives pH value critical field and each concentration standard scope;
(6-3) pH sensor of n terminal and m-1 ion concentration sensor being inserted n respectively fills in the double dish of nutrient solution, and pH sensor detects the pH value of nutrient solution, and each ion concentration sensor detects the concentration of various ion respectively;
(6-4) n equal scan round of terminal control unit detects with each port that interface is connected, and is compared respectively by the detected value of each ion concentration sensor with concentration standard scope;
If (6-5) the terminal control unit Z of any one terminal A
athe detected value obtaining p ion transducer B is in the judgement outside the concentration standard scope of setting, Z
athe abnormal information of the ion concentration corresponding with this ion transducer is sent by the second wireless transceiver, master controller receives abnormal information by the first wireless transceiver, main controller controls display demonstrates the sequence number of the double dish of concentration abnormality and the title of ion, and alarm sends warning message; Wherein, m-1>=p>=1;
(6-6) nutrient solution concentration controls
(6-6-1) after T time delay, Z
aobtain the detected value b that each ion transducer is current
1, b
2..., b
m-1;
Z
autilize formula
calculate the nutrition parameters in the nutrient solution of the double dish corresponding with terminal A, wherein, s=b
1+ b
2+ ...+b
m-1, μ
max, k
mand k
ibe the parameter of setting;
If (6-6-2) detected value of p ion transducer B to be in outside critical field and μ≤μ ' time, then Z
adifference between the current ion concentration detected according to p ion transducer B and critical field, calculates respectively and obtains the feed liquor time t of each feed tube corresponding with each ion transducer B
1, t
2..., t
p;
Terminal control unit controls each micro pump corresponding with each ion transducer B and opens t respectively
1, t
2..., t
prear closedown; Forward step (6-7) to;
If (6-6-3) detected value of p ion transducer B to be in outside critical field and μ > μ ' time, terminal control unit control w
3open, micro pump adds water in double dish, Z
autilize formula
calculate the nutrition parameters in the nutrient solution of the double dish corresponding with terminal A, till μ≤μ ', return step (6-4);
(6-7) medium pH value controls
Z
athe detection numerical value r of current pH sensor is compared with the pH value critical field of setting, as r > R
2time, Z
acontrol micro pump w
1open, micro pump adds diluted salpeter solution in double dish, until the detection numerical value r=R of pH sensor
1till;
As r < R
1time, Z
acontrol micro pump w
2open, micro pump adds diluted NaOH solution in double dish, until the detection numerical value r=R of pH sensor
2till; Return step (6-4).
As preferably, step (6-7) is replaced by following step:
Z
aobtain t
i-dmoment is to current time t
ipH sensor detected value curve S (t), t
i-dfor t
iin the moment before, the two differs time d; Volatilization and decomposition threshold SNR is prestored in storer
w;
Z
as (t) is inputted the accidental resonance model prestored in memory
in;
Wherein, x (t) is the displacement of vibration particle, and Ω is angular frequency, f
0be signal frequency, A is constant, r and ω is the attenuation coefficient of setting and the frequency of linear oscillator particle respectively, and c is the signal adjustment coefficient of setting, and b is the quadratic noise ξ of setting
2t the coefficient of (), ξ (t) is three discrimination noises, and { dismutation of noise follows Poisson distribution to ξ (t) ∈ for-a, 0, a}, a > 0, and its probability distribution is p
s(a)=p
s(-a)=q, p
s(0)=1-2q, wherein 0 < q < 0.5;
Noise average and correlativity follow < ξ (t) >=0, < ξ (t) ξ (t+ τ) >=2qa
2e
-λ τ;
Wherein λ is correlation ratio, and the flatness of three discriminations noise ξ (t) is
When model resonates, particle produces resonance in certain position, and this angular frequency Ω, attenuation coefficient r, correlation ratio λ, coefficient b, constant a, q determine;
Z
autilize formula
calculate and obtain the output signal-to-noise ratio SNR corresponding with S (t);
Z
athe detection numerical value r of current pH sensor is compared, as SNR>=SNR with the pH value critical field of setting
wand r > R
2time, Z
acontrol micro pump w
1open, until the detection numerical value r=q of pH sensor
1r
1till, 0.8 < q
1< 1;
As r < R
1time, Z
acontrol micro pump w
2open, until the detection numerical value r=q of pH sensor
2r
2till, 1 < q
2< 1.1; Return step (6-4).
Consider that the variable effect of the change of environment to pH value is larger, pH sensor detected value curve S (t) in select time d of the present invention, by can obtain the output signal-to-noise ratio SNR of representing ambient conversion severe degree to the accidental resonance analysis of S (t), by SNR and volatilization and decomposition threshold SNR
w, thus the bound of pH value critical field is finely tuned, thus give the volatilization of nutrient solution and decompose reserved certain wide area amount.
As preferably, the concentration of described salpeter solution is 0.045% to 0.054%.
As preferably, described T is 5 to 8 minutes.
As preferably, d is 5 to 30 minutes.
The present invention has following beneficial effect: low price, can adjust controlling functions in time according to the needs automatically controlled; Good reliability, in stable condition, provide reliable basis for relying on the growing up healthy and sound of plant of nutrient solution existence.
Accompanying drawing explanation
Fig. 1 is a kind of circuit diagram of control end of the present invention;
Fig. 2 is a kind of circuit diagram of terminal of the present invention;
Fig. 3 is a kind of process flow diagram of embodiments of the invention 1.
In figure: control end 1, terminal 2, master controller 3, first wireless transceiver 4, display 5, alarm 6, terminal control unit 7, second wireless transceiver 8, ion concentration sensor 9, detect interface 10, micro pump 11, antenna 12, crystal oscillator 13, start button 14, stop key 15, switch key 16, status indicator lamp 17, pH sensor 18, storer 19.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
Embodiment 1
Embodiment is as shown in Figure 1 and Figure 2 a kind of soilless culture nutrient solution automaton, comprises control end 1 and 10 for detecting the terminal 2 of component content in different double dish respectively; Control end comprises shell, is located at the master controller 3 in shell, storer 19 and the first wireless transceiver 4, is located at the display 5 on shell and alarm 6; Each terminal includes housing, is located at the terminal control unit 7 in housing and the second wireless transceiver 8, and 5 of being located on housing detect interface 10; 5 are detected interface and are electrically connected with pH sensor 18 and 4 ion concentration sensors 9 respectively; Master controller is electrically connected with the first wireless transceiver, display, storer and alarm respectively; Be equipped with 7 micro pumps 11 above each double dish, wherein, 4 micro pumps are connected with the liquid storage box filling different ions solution respectively, 2 micro pump w
1and w
2be connected with aqueous slkali liquid storage box with acid solution liquid storage box respectively, 1 micro pump w
3be connected with storage box, the second wireless transceiver that each terminal control unit is corresponding with it respectively, m is detected interface and the electrical connection of each micro pump; First wireless transceiver respectively with the second wireless transceiver wireless connections of each terminal.
5 are detected interface and are electrically connected with potassium ion sensor, Sensor of Nitrate Ions, conductor Calcium ion sensor, chlorion sensor and pH sensor respectively.
As shown in Figure 1 and Figure 2, master controller and terminal control unit are CC2530 single-chip microcomputer, and each sensor is all electrically connected with corresponding detection interface by amplifying circuit.
As shown in Figure 1, control end also comprises antenna 12, crystal oscillator 13, starts button 14 and stop key 15, and antenna, crystal oscillator, startup button and stopping key all is electrically connected with master controller.
As shown in Figure 2, each terminal also comprises switch key 16 and status indicator lamp 17, and switch key and status indicator lamp are all electrically connected with corresponding terminal control unit.
As shown in Figure 3, a kind of control method of soilless culture nutrient solution automaton, comprises the steps:
PH value critical field [R is stored in storer
1, R
2], the concentration standard scope corresponding with each ion concentration sensor; Nutrition threshold value μ ' is equipped with in each terminal control unit;
Step 100, initial setting up
Master controller sends pH value critical field and each concentration standard scope by the first wireless transceiver, and each second wireless transceiver receives pH value critical field and each concentration standard scope;
Step 200, pH value and ion concentration detect
The pH sensor of 10 terminals and 4 ion concentration sensors are inserted 10 respectively to be filled in the double dish of nutrient solution, and pH sensor detects the pH value of nutrient solution, and each ion concentration sensor detects the concentration of various ion respectively;
Step 300, detected value compares with critical field
10 equal scan round of terminal control unit detects with each port that interface is connected, and is compared respectively by the detected value of each ion concentration sensor with concentration standard scope;
Step 400, abnormal show and warning
If the terminal control unit Z of any one terminal A
athe detected value obtaining p ion transducer B is in the judgement outside the concentration standard scope of setting, Z
athe abnormal information of the ion concentration corresponding with this ion transducer is sent by the second wireless transceiver, master controller receives abnormal information by the first wireless transceiver, main controller controls display demonstrates the sequence number of the double dish of ion concentration exception and the title of ion, and alarm sends warning message; Wherein, m-1>=p>=1;
Step 500, nutrient solution concentration controls
Step 510, after 2 minutes time delay, Z
aobtain the detected value b that each ion transducer is current
1, b
2..., b
m-1;
Z
autilize formula
calculate the nutrition parameters in the nutrient solution of the double dish corresponding with terminal A, wherein, s=b
1+ b
2+ ...+b
m-1, μ
max, k
mand k
ibe the parameter of setting;
Step 520, if the detected value of p ion transducer B to be in outside critical field and μ≤μ ' time, then Z
adifference between the current ion concentration detected according to p ion transducer B and critical field, calculates respectively and obtains the feed liquor time t of each feed tube corresponding with each ion transducer B
1, t
2..., t
p;
Such as, if certain ion concentration optimum value is 4mmol/L, concentration standard scope is 3.5-4.5mmol/L, and the amount of solution of the nutrient culture media that this terminal node is corresponding is 50L, supposes that now ion concentration is 3.2mmol/L, needs to add optimum concentration value to, can be calculated as
4-3.2＝0.80.8*50＝40mmol
If select the solion concentration of adding to be 0.1mol/L, the amount of adding is needed to be 40/0.1=400mL
If micro pump flow per minute is 100mL, then the solution of 400mL needs the ON time making micro pump to be 400/100=4 minute.
Terminal control unit controls each micro pump corresponding with each ion transducer B and opens t respectively
1, t
2..., t
prear closedown; Forward step 600 to;
Step 530, if the detected value of p ion transducer B to be in outside critical field and μ > μ ' time, terminal control unit control w
3open, micro pump adds water in double dish, Z
autilize formula
calculate the nutrition parameters in the nutrient solution of the double dish corresponding with terminal A, till μ≤μ ', return step 300;
Step 600, medium pH value controls
Z
athe detection numerical value r of current pH sensor is compared with the pH value critical field of setting, as r > R
2time, Z
acontrol micro pump w
1open, micro pump adds diluted salpeter solution in double dish, until the detection numerical value r=R of pH sensor
1till;
As r < R
1time, Z
acontrol micro pump w
2open, micro pump adds diluted NaOH solution in double dish, until the detection numerical value r=R of pH sensor
2till; Return step 300.
Embodiment 2
Step 600 in embodiment 1 is replaced by following step, other structure in embodiment 2 and method part all in the same manner as in Example 1;
Z
aobtain t
i-dmoment is to current time t
ipH sensor detected value curve S (t), t
i-dfor t
iin the moment before, the two differs time d; Volatilization and decomposition threshold SNR is prestored in storer
w;
Z
as (t) is inputted the accidental resonance model prestored in memory
in;
Wherein, x (t) is the displacement of vibration particle, and Ω is angular frequency, f
0be signal frequency, A is constant, r and ω is the attenuation coefficient of setting and the frequency of linear oscillator particle respectively, and c is the signal adjustment coefficient of setting, and b is the quadratic noise ξ of setting
2t the coefficient of (), ξ (t) is three discrimination noises, and { dismutation of noise follows Poisson distribution to ξ (t) ∈ for-a, 0, a}, a > 0, and its probability distribution is p
s(a)=p
s(-a)=q, p
s(0)=1-2q, wherein 0 < q < 0.5;
Noise average and correlativity follow < ξ (t) >=0, < ξ (t) ξ (t+ τ) >=2qa2e
-λ τ;
Wherein λ is correlation ratio, and the flatness of three discriminations noise ξ (t) is
When model resonates, particle produces resonance in certain position, and this angular frequency Ω, attenuation coefficient r, correlation ratio λ, coefficient b, constant a, q determine;
Z
autilize formula
calculate and obtain the output signal-to-noise ratio SNR corresponding with S (t);
Z
athe detection numerical value r of current pH sensor is compared, as SNR>=SNR with the pH value critical field of setting
wand r > R
2time, Z
acontrol micro pump w
1open, until the detection numerical value r=q of pH sensor
1r
1till, 0.8 < q
1< 1;
As r < R
1time, Z
acontrol micro pump w
2open, until the detection numerical value r=q of pH sensor
2r
2till, 1 < q
2< 1.1; Return step 300.
In embodiment 1 and 2, the concentration of salpeter solution is 0.05%, d is 20 minutes.
Should be understood that the present embodiment is only not used in for illustration of the present invention to limit the scope of the invention.In addition should be understood that those skilled in the art can make various changes or modifications the present invention, and these equivalent form of values fall within the application's appended claims limited range equally after the content of having read the present invention's instruction.
Claims (10)
1. a soilless culture nutrient solution automaton, is characterized in that, comprises control end (1) and n for detecting the terminal (2) of component content in different double dish respectively; Described control end comprises shell, is located at the master controller (3) in shell, storer (19) and the first wireless transceiver (4), is located at the display (5) on shell and alarm (6); Each terminal includes housing, is located at the terminal control unit (7) in housing and the second wireless transceiver (8), and m of being located on housing detects interface (10); M is detected interface and is electrically connected with pH sensor (18) and m-1 ion concentration sensor (9) respectively; Master controller is electrically connected with the first wireless transceiver, display, storer and alarm respectively; Be equipped with m+2 micro pump (11) above each double dish, wherein, m-1 micro pump is connected with the liquid storage box filling different ions solution respectively, 2 micro pump w
1and w
2be connected with aqueous slkali liquid storage box with acid solution liquid storage box respectively, 1 micro pump w
3be connected with storage box, the second wireless transceiver that each terminal control unit is corresponding with it respectively, m is detected interface and the electrical connection of each micro pump; First wireless transceiver respectively with the second wireless transceiver wireless connections of each terminal.
2. soilless culture nutrient solution automaton according to claim 1, it is characterized in that, described detection interface is 5, and 5 are detected interface and are electrically connected with potassium ion sensor, Sensor of Nitrate Ions, conductor Calcium ion sensor, chlorion sensor and pH sensor respectively.
3. soilless culture nutrient solution automaton according to claim 1, it is characterized in that, described master controller and terminal control unit are CC2530 single-chip microcomputer, and each sensor is all electrically connected with corresponding detection interface by amplifying circuit.
4. soilless culture nutrient solution automaton according to claim 1, is characterized in that, control end also comprises startup button (14) and stop key (15), starts button and stop key all to be electrically connected with master controller.
5. the soilless culture nutrient solution automaton according to claim 1 or 2 or 3 or 4, it is characterized in that, each terminal also comprises switch key (16) and status indicator lamp (17), and switch key and status indicator lamp are all electrically connected with corresponding terminal control unit.
6. be applicable to a control method for soilless culture nutrient solution automaton according to claim 1, it is characterized in that, comprise the steps:
(6-1) pH value critical field [R is stored in storer
1, R
2], the concentration standard scope corresponding with each ion concentration sensor; Nutrition threshold value μ ' is equipped with in each terminal control unit;
(6-2) master controller sends pH value critical field and each concentration standard scope by the first wireless transceiver, and the second wireless transceiver receives pH value critical field and each concentration standard scope;
(6-3) pH sensor of n terminal and m-1 ion concentration sensor being inserted n respectively fills in the double dish of nutrient solution, and pH sensor detects the pH value of nutrient solution, and each ion concentration sensor detects the concentration of various ion respectively;
(6-4) n equal scan round of terminal control unit detects with each port that interface is connected, and is compared respectively by the detected value of each ion concentration sensor with concentration standard scope;
If (6-5) the terminal control unit Z of any one terminal A
athe detected value obtaining p ion transducer B is in the judgement outside the concentration standard scope of setting, Z
athe abnormal information of the ion concentration corresponding with this ion transducer is sent by the second wireless transceiver, master controller receives abnormal information by the first wireless transceiver, main controller controls display demonstrates the sequence number of the double dish of concentration abnormality and the title of ion, and alarm sends warning message; Wherein, m-1>=p>=1;
(6-6) nutrient solution concentration controls
(6-6-1) after T time delay, Z
aobtain the detected value b that each ion transducer is current
1, b
2..., b
m-1;
Z
autilize formula
calculate the nutrition parameters in the nutrient solution of the double dish corresponding with terminal A, wherein, s=b
1+ b
2+ ...+b
m-1, μ
max, k
mand k
ibe the parameter of setting;
If (6-6-2) detected value of p ion transducer B to be in outside critical field and μ≤μ ' time, then Z
adifference between the current ion concentration detected according to p ion transducer B and critical field, calculates respectively and obtains the feed liquor time t of each feed tube corresponding with each ion transducer B
1, t
2..., t
p;
Terminal control unit controls each micro pump corresponding with each ion transducer B and opens t respectively
1, t
2..., t
prear closedown; Forward step (6-7) to;
If (6-6-3) detected value of p ion transducer B to be in outside critical field and μ > μ ' time, terminal control unit control w
3open, micro pump adds water in double dish, Z
autilize formula
calculate the nutrition parameters in the nutrient solution of the double dish corresponding with terminal A, till μ≤μ ', return step (6-4);
(6-7) medium pH value controls
Z
athe detection numerical value r of current pH sensor is compared with the pH value critical field of setting, as r > R
2time, Z
acontrol micro pump w
1open, micro pump adds diluted salpeter solution in double dish, until the detection numerical value r=R of pH sensor
1till;
As r < R
1time, Z
acontrol micro pump w
2open, micro pump adds diluted NaOH solution in double dish, until the detection numerical value r=R of pH sensor
2till; Return step (6-4).
7. the control method of soilless culture nutrient solution automaton according to claim 6, is characterized in that, step (6-7) is replaced by following step:
Z
aobtain t
i-dmoment is to current time t
ipH sensor detected value curve S (t), t
i-dfor t
iin the moment before, the two differs time d; Volatilization and decomposition threshold SNR is prestored in storer
w;
Z
as (t) is inputted the accidental resonance model prestored in memory
in;
Wherein, x (t) is the displacement of vibration particle, and Ω is angular frequency, f
0be signal frequency, A is constant, r and ω is the attenuation coefficient of setting and the frequency of linear oscillator particle respectively, and c is the signal adjustment coefficient of setting, and b is the quadratic noise ξ of setting
2t the coefficient of (), ξ (t) is three discrimination noises, and { dismutation of noise follows Poisson distribution to ξ (t) ∈ for-a, 0, a}, a > 0, and its probability distribution is p
s(a)=p
s(-a)=q, p
s(0)=1-2q, wherein 0 < q < 0.5;
Noise average and correlativity follow < ξ (t) >=0, < ξ (t) ξ (t+ τ) >=2qa
2e
-λ τ;
Wherein λ is correlation ratio, and the flatness of three discriminations noise ξ (t) is
When model resonates, particle produces resonance in certain position, and this angular frequency Ω, attenuation coefficient r, correlation ratio λ, coefficient b, constant a, q determine;
Z
autilize formula
calculate and obtain the output signal-to-noise ratio SNR corresponding with S (t);
Z
athe detection numerical value r of current pH sensor is compared, as SNR>=SNR with the pH value critical field of setting
wand r > R
2time, Z
acontrol micro pump w
1open, until the detection numerical value r=q of pH sensor
1r
1till, 0.8 < q
1< 1;
As r < R
1time, Z
acontrol micro pump w
2open, until the detection numerical value r=q of pH sensor
2r
2till, 1 < q
2< 1.1; Return step (6-4).
8. the control method of soilless culture nutrient solution automaton according to claim 6, is characterized in that, the concentration of described salpeter solution is 0.045% to 0.054%.
9. the control method of soilless culture nutrient solution automaton according to claim 6, is characterized in that, described T is 5 to 8 minutes.
10. the control method of soilless culture nutrient solution automaton according to claim 7, is characterized in that, d is 5 to 30 minutes.
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| CN105993353A (en) * | 2016-07-20 | 2016-10-12 | 安徽朗坤物联网有限公司 | Agricultural drop irrigation nutrient element online monitoring system based on internet of things |
| CN106645593A (en) * | 2017-01-24 | 2017-05-10 | 浙江农林大学 | Hazardous chemical poison reagent leakage detection method |
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Application publication date: 20160127 |