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Non-invasive heat pulse stem flow gauge

A non-invasive, thermal pulse technology, used in the application of thermal effects to detect fluid flow, calorimeters, measure heat, etc., can solve the problem of high requirements for the use environment of temperature sensors

Inactive Publication Date: 2007-09-19
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the method is still intrusive
[0009] To sum up, although the performance of the thermal pulse stem flow meter is better, it is mainly used in the invasive method, which is applied to woody plants. Flow meter, this kind of stem flow meter has higher requirements on the temperature sensor and the use environment

Method used

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  • Non-invasive heat pulse stem flow gauge

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Embodiment Construction

[0014] Refer to accompanying drawing 1. The principle of the non-invasive thermal pulse sap flow meter of the present invention is shown in Figure 1. It includes a heating element 2 and a differential amplification and signal control processing circuit 3 arranged on the surface of the plant 5. The sap flow meter is placed on the heating element. Downstream of the sap flow at the location, a downstream temperature sensor 1 is provided, and the sap flow meter is provided with an upstream temperature sensor 4 paired with the downstream temperature sensor at the upstream of the sap flow at the location of the heating element, and the paired upstream temperature sensor It is connected with the downstream temperature sensor and the differential amplification and signal control processing circuit.

[0015] In the present invention, since the sap flow moves from the root to the top of the plant, we define the root of the plant as upstream and the top of the plant as downstream.

[00...

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Abstract

The present invention provides an un-intrusive type pulse stem flow gauge including a heating element positioned on the surface of the plant, a differential amplifying circuit and a signal control processing circuit. A downriver temperature sensor is positioned down the stem flow where the heating element of the stem flow gauge is positioned; an upriver temperature sensor assortative with the downstream temperature sensor is provided on the upper of the stem flow where the heating element of the stem flow gauge is positioned. Said downriver temperature sensor and upriver temperature sensor are connected with the differential amplifying circuit and the signal control processing circuit. As a result, the stem flow measuring of the plant with a smaller diameter can be realized conveniently in the present invention by adopting an un-intrusive type heating method and a differential temperature measuring method of the temperature sensor through measuring the moving time of the heat pulse inner the plant.

Description

technical field [0001] The invention relates to a thermal pulse sap flowmeter. Background technique [0002] The physiological process of plants is carried out in the continuous system of soil-plant-atmosphere. When environmental factors change favorable or unfavorable, various physiological parameters of plants will also change accordingly. Therefore, various physiological parameters of plants The detection of parameters can help us understand the impact of changes in surrounding environmental factors on plant growth and development, so that various factors such as soil nutrients and water can be adjusted to optimize the growth conditions of various plants and crops. [0003] Among the various physiological processes of plants, transpiration is a relatively important process. Transpiration refers to the process of losing water from the surface of living plants (mainly leaves) to the atmosphere in the form of water vapor. According to statistics, mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/68G01K17/08G01K17/20
Inventor 吴坚
Owner ZHEJIANG UNIV
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