CN201503407U

CN201503407U - Non-invasive plant hydropenia monitoring system based on measurement of impedance

Info

Publication number: CN201503407U
Application number: CN2009202461100U
Authority: CN
Inventors: 张晗; 陈健军
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-10-10
Filing date: 2009-10-10
Publication date: 2010-06-09
Anticipated expiration: 2019-10-10

Abstract

The utility model relates to a non-invasive plant hydropenia monitoring system based on the measurement of impedance. The system is composed of electrodes, measurement leads, an impedance measuring unit and a USB communication and control unit. The electrodes utilize metal sheets; the electrodes are correspondingly positioned around the circumferences of plant leaves and stems and are connected to the impedance measuring unit by the measurement leads; the impedance measuring unit can realize the sweep frequency measurement of impedance to obtain the impedance values under different frequencies, and the power of the impedance measuring unit is supplied through a USB data line. The USB communication and control unit realizes the communication between the impedance measuring unit and a personal computer and transmits the data measured by the impedance measuring unit to the personal computer for storing and displaying. The system causes no damage to the plant tissues in measuring process; simultaneously, the system can carry out the sweep frequency measurement of impedance to obtain the information of impedance values under different frequencies in relation to the change of water content, so the system can carry out the nondestructive monitoring in the plant hydropenia situation.

Description

A kind of non-intrusion type plant hydropenia monitoring system based on impedance measurement

[technical field]

The utility model belongs to field of measuring technique, particularly a kind of non-intrusion type plant hydropenia monitoring system based on impedance measurement.

[background technology]

Usually the process of plant suction and dehydration relates to soil, weather, plant three aspects.The first kind is to be object research with the moisture degree of soil traditionally, and second class is object with the environment, estimates the plant water requirement by the variation of environmental baseline; This two classes research can reflect the plant growth environment index indirectly, and its deficiency is to reflect more blunt, hysteresis.The 3rd class research directly is object with the plant, and research plant water status, its index can directly reflect the plant state of hungering and thirst.

Domestic diagnosis to plant hydropenia at present mainly is according to soil moisture, other leaf temperature, page transpiration rate, soil water potential, the little contraction of stem stalk (perhaps fruit) etc. in addition, but these method ubiquity resolution are not high, are subject to defectives such as external interference.Diagnose damage caused by a drought with soil moisture content, accurately easily go, but because the native test method of roasting is loaded down with trivial details, the time is long, diagnoses generally untimely.

When plant generation water was coerced, corresponding electrical impedance value also can change, and therefore adopts the electrical impedance of the measuring method monitoring plant stem of electrical impedance, can obtain the water status information of plant itself; In addition, because electrical measurement equipment is fairly simple, be convenient to realize and carry, can carry out data storage and processing easily, thereby the featured resistance of plant is anti-is expected to become that water is coerced or the early sign of the drought stress and the plant underproduction, is used for the research and development of automatic irrigation system as a special plant responding.Usually plug-type electrode is adopted in the resistance measurement of plant water content, easily plant is damaged.

[summary of the invention]

The purpose of this utility model provides a kind of non-intrusion type plant hydropenia monitoring system based on impedance measurement; Avoided destruction, can carry out the impedance measurement of non-intrusion type frequency sweep, be convenient to be connected, be used for the demonstration and the storage of long-time data, for the health monitoring of plant provides reference with PC to axis to the plant tissue organ.

For achieving the above object, a kind of non-intrusion type plant hydropenia monitoring system that the utility model provides based on impedance measurement, by the following technical solutions:

Described system is made up of with control module 14 and PC 15

electrode

112 and 113, measuring

lead wire

121 and 122, impedance measuring unit 131, USB communication.Electrode 112 and 113 adopts sheet metal; Electrode contraposition in plant base of leaf 111 peripheries, is connected to impedance measuring unit 131 by measuring

lead wire

121 and 122; Impedance measuring unit is by the usb data line power supply of USB communication and control module 14.USB communication and control module 14 realized the communication of impedance measuring unit 131 and PC 15, and the data that impedance measuring unit 131 is recorded reach the interface program of PC 15 and handle, store and show.

Wherein, described electrode can be square, circular or oval; During measurement two

metal electrodes

112 and 113 are placed plant base of leaf 111 peripheries, be connected with impedance measuring unit by measuring lead wire.

Wherein, described measuring

lead wire

121 and 122 single core coaxial cable or common leads for the band screen layer.

Wherein, described impedance measuring unit adopts impedance measurement chip AD5933, and the frequency range of measurement is 1kHz to 100kHz, frequency interval can be set carry out sweep measurement.The measurement VIN port one 32 of impedance measurement chip 131 is connected with 122 by measuring lead wire 121 respectively with 113 with electrode 112 with VOUT port one 33.Impedance measuring unit 131 is connected with PC 15 with control module 14 by the USB communication.

Wherein, described USB communication and control module 14 are connected the back and give impedance measuring unit 131 power supplies with PC 15, and the data that impedance measuring unit 131 records are reached PC 15 store and show.

Wherein, the interface program of described PC 15, but setting measurement frequency, Measuring Time; Obtain impedance measuring unit 131 and be uploaded to the impedance measurement data of PC 15, handle, store and show through USB communication and control module 14.According to the plant hydropenia situation that records in advance and the relation of resistance value, judge the degree of water shortage of plant, and show the residing water shortage status of plant in real time.

The advantage of the utility model provides a kind of non-intrusion type plant hydropenia monitoring system based on impedance measurement is:

1. adopt impedance measurement mode, the measurement range of water percentage wide (0 to 100% water percentage);

2. adopt the electrode measurement mode of non-intrusion type,, be particularly useful for the water shortage status monitoring of some rare plants the plant not damaged;

3. simple in structure, volume is little, be easy to carry, and is easy to use;

4. by the power supply of computing machine USB interface, can carry out storage, demonstration and the processing of long continuous monitoring and data,

[Figure of description]

Fig. 1 is a kind of non-intrusion type plant hydropenia monitoring system instrumentation plan based on impedance measurement.

[embodiment]

Specific implementation process is as follows:

With reference to accompanying drawing 1, the USB patchcord of impedance measuring unit 131 by USB communication and control module 14 is connected to PC 15; Setting measurement frequency and Measuring Time on PC send to chip AD5933 with impedance measuring unit 131 through USB communication and control module 14 with the parameter of setting.The measurement VIN port one 32 of impedance measuring unit 131 chips AD5933 is connected with 122 by measuring lead wire 121 respectively with 113 with electrode 112 with VOUT port one 33.Electrode 112 and 113 is positioned over the periphery of axis 111, records the amplitude and the phase angle of the impedance of axis correspondence by impedance measuring unit 131, and handle, show and store through the interface program that USB communication and control module 14 are uploaded to PC 15.According to the plant hydropenia situation that records in advance and the relation of resistance value, judge the degree of water shortage of plant, and show the residing water shortage status of plant in real time.

Claims

1. non-intrusion type plant hydropenia monitoring system based on impedance measurement; Described system is made up of with control module (14) and PC (15) electrode 112 and 113, measuring lead wire 121 and 122, impedance measuring unit (131), USB communication, and electrode 112 and 113 adopts sheet metal; Electrode contraposition in plant base of leaf (111) periphery, is connected to impedance measuring unit (131) by measuring lead wire 121 and 122; Impedance measuring unit is by the usb data line power supply of USB communication and control module (14), USB communication and control module (14) are realized the communication of impedance measuring unit (131) and PC (15), and the data that impedance measuring unit (131) is recorded reach the interface program of PC (15) and handle, store and show.

2. according to the described a kind of non-intrusion type plant hydropenia monitoring system of claim 1, it is characterized in that described electrode can be square, circular or oval based on impedance measurement; During measurement two metal electrodes 112 and 113 are placed plant base of leaf (111) periphery, be connected with impedance measuring unit by measuring lead wire.

3. according to the described a kind of non-intrusion type plant hydropenia monitoring system of claim 1, it is characterized in that described measuring lead wire 121 and 122 single core coaxial cable or common leads for the band screen layer based on impedance measurement.

4. according to the described a kind of plant hydropenia monitoring system of claim 1 based on the non-intrusion type impedance measurement, it is characterized in that described impedance measuring unit adopts impedance measurement chip AD5933, the frequency range of measuring is 1kHz to 100kHz, frequency interval can be set carry out sweep measurement, the measurement VIN port (132) of impedance measurement chip (131) is connected with 122 by measuring lead wire 121 respectively with 113 with electrode 112 with VOUT port (133), and impedance measuring unit (131) is connected with PC (15) with control module (14) by the USB communication.

5. according to the described a kind of plant hydropenia monitoring system of claim 1 based on the non-intrusion type impedance measurement, it is characterized in that described USB communication and control module (14) are connected the back and give impedance measuring unit (131) power supply with PC (15), and the data that impedance measuring unit (131) records are reached PC (15) store and show.

6. according to the described a kind of plant hydropenia monitoring system of claim 1, it is characterized in that the interface program of described PC (15) based on the non-intrusion type impedance measurement, but setting measurement frequency, Measuring Time; Obtain impedance measuring unit (131) is uploaded to PC (15) through USB communication and control module (14) impedance measurement data, handle, store and show, according to the plant hydropenia situation that records in advance and the relation of resistance value, judge the degree of water shortage of plant, and show the residing water shortage status of plant in real time.