Droplet Measurement Technologies proposes to build a compact, lightweight optical sensor that measures the size, concentration, refractive index and phase of cloud and aerosol particles in the diameter range from 0.2 - 80 micrometers. The sensor uses a unique combination of optics that detects… More

In the Phase I study, a protype instrument, the aerosolvaporization spectrometer (AVS)was evaluated for the ability toclassify airborne aerosol particles by their incandescentsignal. The instrument uses a diode pumped Nd:YAG laser at 1.06u wavelength to excite the particles. The scattering signal… More

Droplet Measurement Technologies, Inc. proposes to demonstrate the viability of a newtechnique for measuring carbon mass on a particle-by-particle basis. The methodologyutilizes a combination of light scattering and emission to differentiate carbonaerosolsfrom other types of particles and quantify… More

Droplet Measurement Technologies proposed to develop a compact, integrated, multi-sensor system for the airborne characterization of cloud icing conditions. This system will measure cloud particle size, number concentration, mass and phase, as well as temperature pressure and airspeed. This… More

Droplet Measurement Technologies proposed to develop a compact, integrated, multi-sensor system for the airborne characterization of cloud icing conditions. This system will measure cloud particle size, number concentration, mass and phase, as well as temperature pressure and airspeed. This… More

This Small Business Technology Transfer (STTR) Phase I project is to determine the feasibility of leveraging existing weather and communication systems to provide location-specific, detailed, automatic, and continuous weather information nationwide to the general public. The project will determine… More

An instrument for simultaneous three wavelength measurement of aerosol light scattering and absorption will be designed and a prototype constructed.

An advanced single particle spectrometer (ASPN) will be developed that will be deployable on fixed, mobile or airborne measurement platforms. Particle size measurement will be from 0.15 to 5 ¿m. Light scattering will be used as the analytical technique to size particles. The unit will have an… More

A three wavelength instrument will be developed that measures aerosol light scatter and absorption simultaneously. Lasers with frequencies of 405, 532 and 870 nm will be used as the light sources. Light absorption by the aerosols will be measured by the photoacoustic technique. The instrument… More

This Small Business Technology Transfer (STTR) Phase I research proposal addresses one of the largest uncertainties in understanding climate change. Measurements of cloud condensation nuclei (CCN) aerosols are fundamental for providing the link between atmospheric aerosol properties and cloud… More

This Small Business Innovation Research (SBIR) research project will develop a lightweight, low power, fast response, high sensitivity instrument for measuring the mass concentration of black carbon aerosols (BCA) in ground based and airborne applications. The compact, single particle soot… More

An integrating nephelometer is proposed that can be deployed on a variety of platforms including powered aircraft and towed vehicles. The design allows air to pass freely through the sample cell with no restrictions. A sampling rate of up to 100 hz will allow for aerosol flux measurements. The… More

Two, complementary techniques are proposed that are deployable on dropsondes or mobile measurement platforms and measure the scattering coefficient of atmosphere aerosols. The Phase I activity will be a proof of concept study that evaluates the relative strengths and weaknesses of the two… More

Aerosols resulting from the particle emissions of combustion can pose a hazard to health and threaten ecosystems. In an effort to better understand and decrease the deleterious impact of these aerosols, the DOE is investing significant resources into new instrumentation and field programs that… More

This Small Business Innovation Research (SBIR) Phase I project will develop a palm-sized and low-cost instrument for measuring the characteristics and distribution of airborne black carbon aerosol particles. Based on an existing analyzer, the optical property analyzer will use photoacoustic… More

The Controlled Towed Vehicle (CTV) has the capability to provide low level, 10 m, detailed information on ocean-atmosphere interactions for several hour periods of time with the tow aircraft maintaining a comfortable and safe flight altitude of 1000-2000 ft. Previous work has detailed turbulence,… More

Ice crystals can form spontaneously from the freezing of water droplets at temperatures colder than -38

A measurement system for measuring the icing characteristics of mixed phased clouds from helicopters is being proposed. The Advanced Sensors for Helicopter Icing Research (ASHIR) is a hybrid system that integrates optical and thermal sensors with sophisticated signal processing algorithms in a… More

An operational optical particle counter will be built, extensively characterized and evaluated that measures the size and shape of aerosol particles with optical diameter from 0.1 to 10 μm. This instrument will distinguish different species of dust and volcanic ash from other types of aerosol… More

The Continuous-Flow Streamwise Thermal-Gradient CCN Counter (CFSTGC) ommercialized by Droplet Measurement Technologies has proven to be reliable, robust, and relatively simple to operate for ground-based and airborne measurements. Supersaturation changes are made by varying the temperature… More

Ice crystals can form spontaneously from the freezing of water droplets at temperatures colder than -38C - homogeneous nucleation - or from multiple processes termed heterogeneous nucleation that occur on refractory/insoluble substances at warmer temperatures. Heterogeneous nucleation occurs at… More

Mixed phase clouds, i.e. those that contain water droplets and ice crystals, make up a large fraction of the clouds that are found over the Arctic region. The radiative impact of these clouds on climate modulation is highly sensitive to the relative mix of water and ice, the size distribution of… More