Wireless stem flow sensor and its control method

A sensor and temperature sensor technology, applied in the field of sensing, can solve the problems of high power consumption, lack of flexibility, single function of the stem flow meter, etc., and achieve the effects of easy production, reduced wiring costs, and simple and accurate measurement equipment

Active Publication Date: 2009-07-08
BEIJING ACADEMY OF AGRICULTURE & FORESTRY SCIENCES
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  • Application Information

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Problems solved by technology

However, due to the fact that multiple pairs of temperature sensors are used in the upstream and downstream positions of the heating element in this technical solution, although the measurement accura

Method used

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  • Wireless stem flow sensor and its control method
  • Wireless stem flow sensor and its control method
  • Wireless stem flow sensor and its control method

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[0041] Example

[0042] Such as figure 1 Shown is the structure diagram of the wireless stalk flow sensor in this embodiment, and the wireless stalk flow sensor includes:

[0043] Sensing parameter acquisition unit 1, signal processing unit 2, interface conversion circuit 3, integrated wireless system on chip 4 (SoC), off-chip memory 5 and power management unit 6. among them:

[0044] Sensing parameter acquisition unit 1, such as figure 2 As shown, it includes a heating element 14 clamped on the surface of the stem, an upstream temperature sensor 13 and a downstream temperature sensor 15 respectively arranged upstream and downstream with the heating element 14 as a symmetric center, for collecting electrical signals of upstream and downstream temperature of the stem respectively Temperature electrical signal. Both the upstream temperature sensor 13 and the downstream temperature sensor 15 keep a distance L from the heating element 14. The upward arrow on the figure indicates the...

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Abstract

The invention relates to a wireless stem flow sensor and a method for controlling the same. The sensor comprises a sensing parameter acquisition unit and a wireless on-chip system, wherein the sensing parameter acquisition unit comprises a heating element clamped on the surface of a stem, and an upstream temperature sensor and a lower downstream temperature sensor which are symmetrically arranged with the heating element as a center and acquire an upstream temperature electrical signal and a downstream temperature electrical signal of the stem respectively; the wireless on-chip system comprises a microcontroller; and according to the upstream temperature electrical signal and the downstream temperature electrical signal, the microcontroller acquires and temporarily stores stem flow data in an on-chip memorizer by a thermal equilibrium method, receives an inquiry instruction and sends the stem flow data out; and a wireless radio-frequency unit receives various instructions sent by an upper computer of a wireless sensing network, retransmits the instructions to the microcontroller, receives the stem flow data sent by the microcontroller and sends the stem flow data to the upper computer by the wireless sensing network. The method adds the wireless sensor to the wireless sensing network and carries out dormancy, the sending of the stem flow data and the adjustment of acquired frequency according to various instruction sent by the upper computer. The equipment is simple, accurate and convenient to manufacture and utilizes a wireless mode to reduce wiring cost.

Description

technical field [0001] The invention relates to the field of sensor technology, in particular to a wireless stem flow sensor and a control method thereof. Background technique [0002] Water is not only an important part of plants, but also an important ecological factor for plant growth and development. Plants change water from a liquid state to a gaseous state, take away heat, and keep the leaf temperature relatively stable in order to grow normally. Most of the water absorbed by plants is consumed in the form of transpiration, so transpiration is a very important factor of plant physiological information, and it is very meaningful to measure and study it. [0003] In the field of plant physiology, the transpiration of plants can be calculated by measuring plant sap flow. The main methods for measuring plant sap flow include heat pulse method, heat diffusion method and heat balance method. Most of the heat pulse method and heat diffusion method use intrusion Type heat so...

Claims

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Application Information

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IPC IPC(8): G01F1/68G01K17/08
Inventor 王成赵春江乔晓军张馨侯瑞锋姜凯
Owner BEIJING ACADEMY OF AGRICULTURE & FORESTRY SCIENCES
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