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Aerodynamic impedance measuring instrument

An aerodynamic and measuring instrument technology, which is applied in the field of measuring instruments and can solve problems such as the inability to calculate aerodynamic impedance r

Inactive Publication Date: 2005-06-15
INST OF GEOGRAPHICAL SCI & NATURAL RESOURCE RES CAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The existing technology cannot directly calculate the aerodynamic impedance r a

Method used

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Embodiment Construction

[0025] The following description only represents a specific embodiment of the present invention, and is only for further illustrating the present invention, but not limiting the present invention.

[0026] The aerodynamic impedance measuring instrument includes a mass sensor, an evaporating dish, a temperature sensor, a dry and wet temperature sensor, and a data collector, and each component is fixed on a bracket with a base. Among them, the diameter of the metal evaporating dish is 15cm, and the depth is 5cm. The spongy foam plastic with a thickness of 4.8cm is filled in the evaporating dish as a water-absorbing material, and it is filled with water. The surface of the water-absorbing material is covered with a thin layer of absorbent cotton gauze, and the absorbent cotton gauze is fully Wet state; place 4 glass platinum resistance temperature sensors between the absorbent cotton gauze and the water-absorbing material, so that the temperature sensors are in close contact with ...

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Abstract

The invention provides an aerodynamic impedance measuring instrument, which relates to an instrument for measuring aerodynamic impedance. The aerodynamic impedance is calculated by measuring the temperature and evaporation of the fully wetted surface in the evaporating dish, and the temperature and humidity of the air above the evaporation surface. The invention includes a weighing meter, a temperature sensor, a dry and wet temperature sensor, and a data collector. The evaporating dish filled with water-absorbing material is filled with water, and the surface is covered with a layer of fully wetted absorbent cotton gauze, and several temperature sensors are placed below; Dry and wet temperature sensors are set on the top, and all temperature sensors are connected to the data collector; the evaporating dish together with the water and other objects in it is placed on the weighing scale, and the outside of the evaporating dish is equipped with a windshield. The invention is used in the research fields of earth-air exchange and inversion of surface flux.

Description

Technical field: [0001] The invention relates to a measuring instrument, in particular to an aerodynamic impedance measuring instrument. Background technique: [0002] Aerodynamic resistance r a It is an important parameter to reflect the stratification of near-surface air, and is widely used in remote sensing evapotranspiration models and other vegetation transpiration models. The usual calculation method is based on the distribution of near-surface wind speed profiles, and the calculation process involves zero plane displacement Difficult-to-determined surface turbulence characteristic parameters such as height, roughness, and air stability functions. [0003] The existing technology cannot directly calculate the aerodynamic impedance r a . [0004] In order to directly measure and calculate the aerodynamic impedance r a , using the Penman formula: [0005] LE=[(ρC p / γ)(e s (t 0 )-e z )] / r a [0006] In the formula: L is the latent heat of vaporization of water...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D21/02G01N13/00
Inventor 孙晓敏张仁华朱治林唐新斋
Owner INST OF GEOGRAPHICAL SCI & NATURAL RESOURCE RES CAS
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