JPH06129887A - Apparatus for measuring stream-in-stem of plant - Google Patents

Abstract

PURPOSE:To directly measure the speed of stream-in-stem without errors by applying voltage to coils built in a pinching part and detecting the potential difference caused between electrodes wherein the difference corresponds to the flow rate of the stream-in-stem running in the direction rectangular to the generated magnetic field. CONSTITUTION:A stem part of a plant is pinched with a clip-like measuring apparatus main body 1. Voltage from an electric power source 15 is applied to the coils 11a, 11b built in the pinching part of the main body 14 to generate a magnetic field to the binding direction of both coils. When stream-in-stem is generated in the direction rectangular to the magnetic field, potential difference occurs between the electrodes 12a, 12b corresponding to the stream speed and is detected. A means to convert the potential difference into a stream speed and display it and a memory to accumulate stream speed data are built in a measuring apparatus 17 and it is possible to take the stream speed data in the memory in a personal computer, etc. Consequently, the stream-in-stem measuring apparatus is easily attached to a plant by pinching the stem part with the main body 14 and the speed of the stream-in-stem can be measured directly without errors.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stem flow measuring device for non-destructively and continuously measuring the stem flow velocity of a plant, which is particularly easy to install and produces an error in measuring the plant stem flow velocity. The present invention relates to a plant stem flow measuring device that can be directly measured without using the method.

[0002]

2. Description of the Related Art Conventionally, the stem flow velocity of a plant is non-destructive.
A stem flow measuring device has been used for continuous measurement.

FIG. 3 is a block diagram showing an example of a conventional plant stem flow measuring device of this type. That is, as shown in FIG. 3, the heater 2 is wound around the stem of the plant 1, and the upper and lower surface temperatures of the heater 2 are measured by a plurality of thermometers 3 including thermocouples and the like. The stem flow velocity (transpiration rate) of the plant 1 is obtained, for example, by the following heat balance equation by utilizing the fact that the temperature above and below the heater 2 varies depending on the amount of heat carried by the stem flow.

[0004]

[Equation 1]

In the above formula, the heat quantity substantially given to the stem (the heat quantity given by the heater 2 minus the heat quantity lost to the heat conduction of the stem and the heat quantity lost to the surroundings) is generated in the plant body. The stem flow velocity is calculated by dividing by the difference in calorific value.

However, in measuring the stem flow velocity in such a plant stem flow measuring device, the temperature of the surface of the plant 1 is measured at several points. Therefore, each thermometer 3
It has been confirmed that a measurement error of about 20% occurs depending on the measurement position, the mounting method, etc., and the mounting is not easy.

Further, the stem flow velocity is obtained by calculation from a heat balance formula, and the fact that it is not direct and the thermal conductivity of the stem used in the formula is different from the type of plant (large tree,
However, there is a problem that a separate measurement is required depending on the case.

[0008]

As described above, in the conventional plant stem flow measuring device, there is a problem that the stem flow velocity cannot be directly measured in addition to the difficulty in mounting. It is an object of the present invention to provide a plant stem flow measuring device which is easy to install and is capable of directly measuring a plant stem flow velocity without causing a measurement error.

[0009]

In order to achieve the above object, according to the invention of claim 1, in a stem flow measuring device for nondestructively and continuously measuring the stem flow velocity of a plant, A pair of coils built in a sandwiching portion sandwiching the stem portion, and a clip-shaped measuring device main body having a pair of electrodes arranged at an intersection point of the sandwiching portion in a direction orthogonal to a magnetic field generated by the coil, A power supply that applies a voltage to the coil,
And a measuring instrument having a detector for detecting a potential difference generated between electrodes according to a flow velocity of a stem flow of a plant flowing in a direction orthogonal to a magnetic field generated by applying a voltage to the coil by the power source.

Further, in the invention described in claim 2, in the plant stem flow measuring device according to claim 1, conversion / display means for converting and displaying the potential difference detected by the detector into a flow velocity, and conversion. A storage means for accumulating the generated flow velocity data is added, and the flow velocity data in the storage means is output to an external device via an interface as required. Here, in particular, in the measuring device main body, the detecting portion composed of the coil and the electrode is molded with a resinous material so as to have a clip shape.

[0011]

Therefore, in the plant stem flow measuring device of the present invention, the clip-shaped measuring device main body is sandwiched between the stems of the plants to be measured, and the coil incorporated in the sandwiching part of the measuring device main body is connected to the measuring device. A magnetic field is generated by applying a voltage from a power source. Then, according to the flow velocity of the stem flow of the plant flowing in the direction orthogonal to the generated magnetic field, the potential difference generated between the pair of electrodes arranged at the intersection position of the sandwiched portion in the direction orthogonal to the generated magnetic field is detected by the measuring instrument. The stem flow velocity of the plant is measured by detecting with a container.

This eliminates the need for mounting a plurality of thermometers and obtaining the coefficient peculiar to the plant, and makes it easy to mount the plant by simply inserting the clip-shaped measuring device main body into the plant stem. The flow velocity can be measured directly without any measurement error.

[0013]

First, the concept of the present invention will be described.

The plant stem flow measuring device of the present invention is an application of an electromagnetic flow measuring technique used in a current meter or the like. That is, a coil and an electrode are built in a clip-shaped measuring device body, and the measuring device body is sandwiched between the stems of plants to be measured. A pair of electrodes is arranged at a position where the direction orthogonal to the magnetic field generated by applying a voltage to the coil intersects the sandwiching portion of the measuring device body. Then, the magnetic field, the direction connecting the pair of electrodes, the current generated by the stem flow in the direction orthogonal to both (according to Fleming's right-hand rule),
The stem flow velocity of a plant is measured by measuring the potential difference between a pair of electrodes. An embodiment of the present invention based on the above concept will be described below in detail with reference to the drawings.

FIG. 1 is a schematic diagram showing a structural example of a plant stem flow measuring device according to the present invention. That is, as shown in FIG. 1, the plant stem flow measuring device according to the present embodiment includes a pair of coils 11a, which are built in a sandwiching portion sandwiching a plant stem.
11b, a pair of electrodes 12a and 12b arranged at the intersections of the sandwiched portions in the direction orthogonal to the magnetic field generated by the coils 11a and 11b, and a spring 13 for giving a restoring force when the sandwiched portions are operated. Clip-shaped (scissor-shaped) measuring device main body 14 having a coil, and the coil 11 of the measuring device main body 14
a power source 15 for applying a voltage to a and 11b, and between the electrodes 12a, 12b in accordance with the flow velocity of a plant stem flow flowing in a direction orthogonal to the magnetic field generated by the voltage application to the coils 11a, 11b by the power source 15 The measuring instrument 17 has a detector 16 for detecting a potential difference.
Next, the operation of measuring the plant stem flow by the plant stem flow measuring apparatus of the present embodiment configured as described above will be described with reference to FIG.

First, as shown in FIG. 2, a clip-shaped measuring device body 14 is sandwiched between the stems of the plant 1 to be measured. Next, the coil 1 built in the sandwiched portion of the measuring device body 14
By applying a voltage from the power supply 15 of the measuring device 17 to 1a and 11b, a magnetic field (magnetic flux) is generated in the direction connecting the opposite coils 11a and 11b. Then, when a stem flow of the plant 1 is generated in a direction orthogonal to the generated magnetic field, that is, from the back side to the front side direction or the front side to the back side direction of the paper surface, the generated magnetic field is generated according to the flow velocity of the stem flow of the plant 1. A potential difference is generated between the pair of electrodes 12a and 12b arranged at the intersection of the sandwiched portions in the direction orthogonal to. Then, the detector 16 of the measuring instrument 17 detects the potential difference generated between the electrodes 12a and 12b. At this time, the electrodes 12a, 12
b is brought into contact with the epidermis of the plant 1 by the repulsive force of the spring 13, and an electric path is formed with the body fluid of the plant 1 as a conductor.

On the other hand, in the measuring device 17, a conversion / display means (not shown) for converting the potential difference detected by the detector 16 into a flow velocity and displaying the flow velocity, and a memory 18 as a storage means for accumulating the converted flow velocity data. Built-in, memory 1
It is possible to load the flow velocity data of No. 8 into an external device such as a personal computer 20 through an interface 19 such as RS232C. In this way, the stem flow velocity of the plant 1 is measured.

As described above, the plant stem flow measuring device of the present embodiment has a pair of coils 11a and 11b built in the sandwiching portion sandwiching the plant stem, and the coils 11a and 1b.
1b, a pair of electrodes 12a and 12b arranged at intersections of the sandwiched portions in a direction orthogonal to the magnetic field generated by 1b, and a clip 13 (scissors) having a spring 13 for giving a restoring force when the sandwiched portions are operated. The measuring device body 14, a power supply 15 for applying a voltage to the coils 11a, 11b of the measuring device body 14, and the coils 11a, 11 by the power supply 15.
Measuring instrument 1 having a detector 16 for detecting a potential difference generated between the electrodes 12a and 12b according to a flow velocity of a stem flow of a plant flowing in a direction orthogonal to a magnetic field generated by applying a voltage to b.
7 and 7.

Therefore, as compared with the conventional thermometer type measurement, it is not necessary to attach a plurality of thermometers and to obtain the coefficient peculiar to the plant, and the clip-shaped measuring device main body 14 is used for the plant 1.
The plant 1
It is possible to directly measure the stem flow velocity (transpiration rate) of the above without causing a measurement error. The present invention is not limited to the above embodiment, but can be implemented in the same manner as described below.

In the above embodiment, the measuring device 17 is replaced by the detector 1.
The electric potential difference detected by 6 is converted into a flow velocity and displayed, and a conversion / display means (not shown) and a memory 18 which is a storage means for accumulating the converted flow velocity data are built in.
The case where the flow velocity data of No. 8 is taken into the external device such as the personal computer 20 through the interface 19 such as RS232C has been described, but these elements may be added as necessary and are essential to the present invention. Not an element.

[0021]

As described above, according to the present invention, a pair of coils incorporated in a sandwiching portion sandwiching a plant stem and a position of an intersection of the sandwiching portion in a direction orthogonal to a magnetic field generated by the coil. A clip-shaped measuring instrument main body having a pair of electrodes arranged on the coil, and a power source for applying a voltage to the coil,
And a measuring instrument having a detector for detecting the potential difference between the electrodes according to the flow velocity of the stem flow of the plant flowing in the direction orthogonal to the magnetic field generated by the voltage application to the coil by the power source It is possible to provide a plant stem flow measuring device which can easily measure the stem flow velocity of a plant directly without causing a measurement error.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an embodiment of a plant stem flow measuring device according to the present invention.

FIG. 2 is a schematic diagram for explaining a situation of measuring stem flow of a plant in the same example.

FIG. 3 is a schematic view showing an example of a conventional plant stem flow measuring device.

[Explanation of symbols]

1 ... Plant, 11a, 11b ... Coil, 12a, 12b ...
Electrodes, 13 ... Spring, 14 ... Measuring instrument main body, 15 ... Power supply, 1
6 ... Detector, 17 ... Measuring instrument, 18 ... Memory, 19 ... Interface, 20 ... Personal computer.

Claims (3)

[Claims] 1. A stem flow measuring device for non-destructively and continuously measuring a stem flow velocity of a plant, wherein a pair of coils embedded in a sandwiching portion sandwiching the stem of the plant and the coil are generated. By a clip-shaped measuring instrument main body having a pair of electrodes arranged at an intersection position of the sandwiched portion in a direction orthogonal to a magnetic field, a power source for applying a voltage to the coil, and a voltage application to the coil by the power source. A plant stem flow measuring device comprising: a detector having a detector for detecting a potential difference generated between the electrodes according to a flow velocity of a stem flow of the plant flowing in a direction orthogonal to a generated magnetic field. . 2. The plant stem flow measuring device according to claim 1, wherein the conversion / display means for converting and displaying the potential difference detected by the detector into a flow velocity, and a memory for accumulating the converted flow velocity data. A plant stem flow measuring device characterized in that the flow rate data of the storage means is output to an external device through an interface, if necessary. 3. The measuring device main body is characterized in that the detecting portion composed of the coil and the electrode is molded with a resinous material so as to have a clip-like shape.
Or the plant stem flow measuring device according to 2.