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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: 2004-06-23
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 present invention provides one kind of aerodynamic impedance measuring instrument, and relates to instrument for aerodynamic impedance measurement. The aerodynamic impedance is calculated based on the temperature and evaporation amount measured in the fully moistened surface inside evaporating dish and the temperature and humidity of the air measured over the evaporating surface. The instrument includes weighing gauge, temperature sensor, wet and dry bulb temperature sensor, data acquirer and evaporating dish filled with hydroscopic material, covered with one layer of fully humidified absorbent cotton gauze and guarded with windproof hood. The present invention is used in ground-atmosphere exchange, ground surface flux inversion and other research fields.

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 Applications(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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