scispace - formally typeset
Search or ask a question
Topic

Disdrometer

About: Disdrometer is a research topic. Over the lifetime, 930 publications have been published within this topic receiving 23092 citations.


Papers
More filters
Posted Content
TL;DR: In this paper, a novel concept was implemented in a single device to study its feasibility to work as a disdrometer and a turbulence sensor, based on these principles, a device was designed and fabricated to detect rain droplet size and wind turbulence.
Abstract: Disdrometers detects size and speed of falling rain droplets in a rainfall. They detect droplets either by impact or optical based methods. Optical based ones, use light source and an optical detector. Droplet crossing the light creates shadow on the detector. This change in the intensity and duration of change provides the size and speed of the droplet. Whereas the impact based method utilizes peizo elements to sense the droplet by physical momentum transfer at the time of droplets impact with the sensor. Apart from the technical differences in them, both of these disdrometers fall in the similar cost range. Wind turbulence sensors works on detection of gradients in wind speeds by employing various working principles like thermal anemometer, laser Doppler anemometer, etc. In thermo anemometers, a heating element is maintained at a constant temperature. As the wind flows, it carries some heat energy away from the element. This causes a change in the resistance in the heating element providing further change in voltages across it. Laser Doppler anemometers work on change in wavelength of light scattered by a moving particle which is caught in the wind flow. These techniques are highly accurate in measuring the turbulence in the air but at elevated costs. Aimed at cost efficacy and acceptable performance of the device, a novel concept was implemented in a single device to study its feasibility to work as a disdrometer and a turbulence sensor. It employs the principles of electromagnetic induction and response of a cantilever to impulses. Based on these principles, a device was designed and fabricated to detect rain droplet size and wind turbulence. It was fabricated from readily available materials. The testing of the device in laboratory conditions yielded satisfactory results as compare to the standard commercial instruments.

1 citations

Proceedings ArticleDOI
21 Dec 2000
TL;DR: In this article, the performance of the dual-wavelength radar was investigated and the accuracy of the rain-rate estimate was studied based on disdrometer measured data, where the intrinsic radar signal fluctuation, the Mie scattering effect and receiver noise effect were incorporated.
Abstract: A strong candidate for the next generation spaceborne rain radar is a dual-wavelength one. The performance of the radar was studied. First, the sensitivity of the shorter wavelength radar was investigated. Based on the data taken by a single-wavelength precipitation radar aboard the Tropical Rainfall Measuring Mission satellite, the frequency distribution of the received power of the shorter wavelength radar was calculated assuming typical rain attenuation. If the receiver noise level is equivalently about 10 dBZ, the missing rain fraction is about 15.41% over land and 3.22% over ocean. Second, the accuracy of the rainrate estimate was studied based on disdrometer measured data. The intrinsic radar signal fluctuation, the Mie scattering effect and receiver noise effect were incorporated. The result shows good potential for accurate rainrate estimate. Third, rainrate estimate of dry snow was investigated. Based on the disdrometer data, snow particle distribution was generated using non-coalescence, non-breakup assumption. After using an empirical relationship between snow density and particle size, a rainrate retrieval formula for snow was proposed. It was also shown that dual-wavelength radar has a good capability for discrimination of snow from rain.

1 citations

Proceedings ArticleDOI
01 Aug 2020
TL;DR: In this article, the results obtained from 5 years of rainfall rate and attenuation measurements are presented and compared with several relevant propagation models: the ITU-R P.837-6, ITU R P.618-13 and MORSE models.
Abstract: A propagation campaign of attenuation measurements with the 40-GHz Alphasat beacon signal is being conducted at the Universidad Politecnica de Madrid (UPM). Besides attenuation, rainfall rate data are collected with a rain gauge and a disdrometer. Rainfall rate and attenuation statistics can be used for assessment and development of attenuation prediction models for satellite radio links. In this paper, the results obtained from 5 years of rainfall rate and attenuation measurements are presented and compared with several relevant propagation models: the ITU-R P.837-6, ITU-R P.837-7 and MORSE models for rainfall rate and the ITU-R P.618-13 for attenuation. A moderate accuracy has been achieved with all models. The ITU-R P.837-7 and MORSE models improve the prediction for probabilities lower than approximately 0.01%, whereas for higher probabilities the three models show a similar performance.

1 citations

문지영, 김동균, 김연희, 하종철, 정관영 
01 Sep 2013
TL;DR: Wang et al. as discussed by the authors investigated properties of cloud and rainfall occurred at Boseong on 10 July 2012, Raindrop Size distributions (RSDs) and other parameters were analyzed using observation data collected by Micro Rain Radar (MRR) and PARticle SIze and VELocity (PARSIVEL) disdrometer located in the National center for intensive observation of severe weather in the southwest of the Korean peninsula.
Abstract: To investigate properties of cloud and rainfall occurred at Boseong on 10 July 2012, Raindrop Size distributions (RSDs) and other parameters were analyzed using observation data collected by Micro Rain Radar (MRR) and PARticle SIze and VELocity (PARSIVEL) disdrometer located in the National center for intensive observation of severe weather at Boseong in the southwest of the Korean peninsula. In addition, time series of RSD parameters, relationship between reflectivity-rain rate, and vertical variation of rain rates-fall velocities below melting layer were examined. As a result, good agreements were found in the reflectivity-rain rate time series as well as their power relationships between MRR and PARSIVEL disdrometer. The rain rate was proportional to reflectivity, mean diameter, and inversely proportional to shape (μ), slope (Λ), intercept (N0) parameter of RSD. In comparison of the RSD, as rain rate was increased, the slope of RSD became less steep and the mean diameter became larger. Also, it was verified that reflectivities are classified in three categories (Category 1: Z (reflectivity) > 40 dBZ, Category 2: 30 dBZ 0 ) parameter of RSD were increased. We expected that these results will lead to better understanding of microphysical process in convective rainfall system occurred during short-term period over Korean peninsula.

1 citations

Patent
06 Jul 2016
TL;DR: In this article, a data collection station for laser disdrometer, including pole setting and data acquisition box, is presented, where the controller links to each other with real-time clock circui module, wireless communication module, and laser dis-rometer respectively.
Abstract: The utility model discloses a data collection station for laser disdrometer, including pole setting and data acquisition box, laser disdrometer locates the pole setting top, data acquisition box locates the pole setting lower part, be equipped with controller, wireless communication module and realtime clock circui module in the data acquisition box, the controller links to each other with realtime clock circui module, wireless communication module and laser disdrometer respectively. The utility model discloses with low costs, the simple structure of data collection station makes things convenient for data transmission.

1 citations


Network Information
Related Topics (5)
Climate model
22.2K papers, 1.1M citations
85% related
Radar
91.6K papers, 1M citations
82% related
Sea surface temperature
21.2K papers, 874.7K citations
82% related
Precipitation
32.8K papers, 990.4K citations
82% related
Snow
35.1K papers, 709.2K citations
80% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202378
2022114
202151
202059
201972
201840