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Methods of determining water droplet size distributions of clouds

A technology of water droplets and droplets, which can be used in the analysis of materials, particle size analysis, liquid dispersion analysis, etc., and can solve problems such as errors and loss.

Active Publication Date: 2013-05-01
ROSEMOUNT AEROSPACE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As a result, information about the distribution of large droplets present in excess of the maximum resolvable diameter is lost, possibly leading to errors in determining the cloud's droplet size distribution and the associated LWC

Method used

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  • Methods of determining water droplet size distributions of clouds
  • Methods of determining water droplet size distributions of clouds
  • Methods of determining water droplet size distributions of clouds

Examples

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Embodiment Construction

[0016] Embodiments described herein can be more readily understood by reference to the following detailed description and accompanying drawings. However, the elements, devices and methods described herein are not limited to the specific embodiments provided in this detailed description and drawings. It should be appreciated that these embodiments are merely illustrative of the principles of the invention. Many modifications and adaptations will be readily apparent to those skilled in the art without departing from the spirit and scope of the invention.

[0017] In one aspect, a method of determining a droplet size distribution of a cloud that addresses the presence of droplets exceeding a maximum detectable droplet diameter is described herein. Furthermore, the method described here considers the use of the determined water droplet size distribution to estimate the LWC of the cloud.

[0018] Turning now to the specific steps of the method described here, which involves sampl...

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Abstract

In one aspect, methods of determining a size distribution of water droplets in a cloud are described herein. In some embodiments, a method of determining a size distribution of water droplets in a cloud comprises sampling a depth of the cloud with a beam of electromagnetic radiation, measuring a scattering signal of the electromagnetic radiation returned from the cloud over a range of field of view angles to provide a measured scattering curve [ptotal(theta)], removing a portion of the measured scattering curve, replacing the removed portion with an extrapolation of the remaining measured scattering curve to provide an estimated scattering curve, and determining a first estimate droplet size distribution [n(1)(D)] from the estimated scattering curve.

Description

technical field [0001] The present invention relates to a method of determining the droplet size distribution (particle size distribution) of clouds. Background technique [0002] The detection of airborne water droplets and their classification into droplet size distributions is an important function in the working (operation) of aircraft. Different cloud formations can exhibit different droplet size distributions and associated cloud liquid water content (LWC), thereby posing various hazards to aircraft, such as icing. The droplet size distribution and LWC of a cloud can be determined or estimated in various ways. Several existing methods are based on diffractive droplet fractionation techniques. However, this diffraction fractionation technique is limited to the maximum detectable droplet diameter due to the small-angle scattering of large droplets. For example, diffractive scattering by angles within the divergence angle of the laser beam is detected with current dete...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B64D15/20G01N21/53G01N21/84G01N21/85G01N1/10
CPCG01N15/02G01N2015/0026B64D15/20G01N15/0211G01S17/95Y02A90/10
Inventor 马克·D·雷卡雷·J·安德森迈克尔·P·内斯尼达尔
Owner ROSEMOUNT AEROSPACE
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