JPH0122136Y2 - - Google Patents

Description

[Detailed description of the invention] Plants generally absorb water through their roots and release it through their leaves. Measuring the amount of water released from plant leaves, that is, the amount of transpiration, is an important tool for plant research. Accordingly, the present invention provides an apparatus that can accurately measure the amount of transpiration described above under a wide range of temperature and humidity conditions.

FIG. 1 is a diagram showing the configuration of an embodiment of the present invention, in which an air conditioner 3 for adjusting the temperature and other conditions of the atmosphere is installed in a growth chamber 2 in which arbitrary plants 1 are housed, as shown by arrow a. Air is circulated through the plants, and illumination lights 4 are provided above the plants. This growth room 2
A chamber 5 made of, for example, a transparent acrylic resin plate is provided inside the chamber 5 to seal the leaf 6 whose transpiration in the plant 1 is to be measured, and the chamber is connected to a transpiration measuring section 9 through conduits 7 and 8. . FIG. 2 is an enlarged view of this part, and the conduits 7 and 8 are made of transparent vinyl tubes or the like so that the state of dew condensation can be observed from the outside. Fit the heater wire introduction pipes 10, 10... into the appropriate positions, draw the heater wire 11 into the conduits 7, 8, and connect the heater to the power source 13 via the voltage regulator 12 to prevent condensation. It is designed to prevent this. Further, the transpiration measuring section 9 and the introduced air humidity adjusting section 14 are connected to the first
As shown in the figure, it is housed in a housing 15, and a warm air fan 18 consisting of a fan 16 and a heater 17 circulates the air inside the housing as shown by arrow b and heats it to prevent dew condensation in the above-mentioned parts.

The humidity adjustment unit 14 includes a humidifier 1 as shown by the arrow c for once increasing the humidity of the introduced air to a sufficiently high level.
9. A dehumidifier 20, a pump 21, a flow rate regulating valve 22, a flow meter 23, etc. are provided to adjust the air sent out from the humidifier to a desired humidity. Further, the transpiration measuring section 9 is provided with a moisture sensor 24 for measuring the humidity of the air sent out from the adjustment section 14 as shown by the arrow d, and the air passing through this sensor is sent into the conduit 7 as shown by the arrow e. It's like this.
and a moisture sensor 25 connected to the conduit 8,
The humidity of the air sent out from the chamber 5 is measured as indicated by the arrow f, and a portion of the air that has passed through this sensor is discharged to the outside as indicated by the arrow g. Furthermore, a passage is formed in which a part of the air that has passed through the moisture sensor 25 is returned to the chamber 5 via the conduit 7 as shown by the arrow h, and a dehumidifier 26 and a moisture sensor 2 are connected to this passage.
7, pump 28, flow rate adjustment valve 29 and flow meter 3
0 is set. Note that the dehumidifier 26 receives output signals from the sensors 24 and 25, and performs automatic control so that these two outputs become equal.

In such a device, warm air is used to prevent parts such as the humidity adjustment section 14, transpiration measurement section 9, conduits 7 and 8, and chamber 5 from falling below the dew point temperature at a humidity arbitrarily set as the transpiration measurement condition. By adjusting the voltage regulator 18, voltage regulator 12, air conditioner 3, etc., erroneous measurements due to dew condensation can be prevented. In addition, the chamber 5 has flowmeters 23 and 3.
The air flow is stabilized in a state in which air corresponding to the sum of the indicated values of 0 flows, and the flow rate of air replenished as shown by arrow d and the flow rate of air discharged as shown by arrow g become equal. Therefore, the regulating valves 22 and 29 are operated to set these flow rates to desired values, respectively. Furthermore, the dehumidifier 20 is adjusted so that the indicated value of the moisture sensor 24 becomes the humidity arbitrarily set as the measurement condition. After making the above adjustments and starting measurement, the dehumidifier 26 detects moisture sensors 24 and 25.
Since the outputs of the dehumidifiers 26 and 26 are automatically controlled to be equal, the amount of moisture removed by the dehumidifier 26 is the amount of moisture generated in the chamber 5, and therefore the amount of transpiration from the leaves 6. That is, the flow rate measured by the flow meter 30 is Q,
When the output of the moisture sensor 25 is x and the output of the moisture sensor 27 is y, the amount of transpiration T is given by T=Q(x-y).

As explained above, since the device of the present invention can accurately measure the amount of transpiration and prevents erroneous measurements due to dew condensation, measurement conditions such as humidity and temperature can be selected from a wide range.

[Brief explanation of drawings]

Figure 1 is a diagram showing the configuration of an embodiment of the present invention, Figure 2 is a diagram showing the configuration of an embodiment of the present invention.
The figure is a diagram showing a partial cross section and an electric circuit in FIG. 1. In the figure, 2 is a plant growing room, 3 is an air conditioner, 5 is a chamber, 7 and 8 are conduits, 9 is a transpiration measurement section, 14 is a humidity adjustment section, 11,
17 is a heater.

Claims (1)

[Scope of utility model registration request] A plant growing room equipped with an air conditioner, a chamber that seals the part of the plant growing room where transpiration of plants is to be measured, and the humidity of the introduced air that sends intake air adjusted to a desired humidity into the chamber. The humidity of the air sent out from the chamber matches the desired humidity by exhausting a part of the air sent out from the chamber and dehumidifying the other part of the air and returning it to the chamber. a transpiration measuring section equipped with a return air flow meter; a heater heating the humidity adjusting section and the transpiration measuring section to prevent condensation of the circulating air; and an air conduit connected to the chamber. A plant transpiration measuring device consisting of a heater that heats and prevents dew condensation.