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- Author or Editor: REX C. WOOD x
- Journal of Applied Meteorology and Climatology x
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Abstract
The Direct-Flow Sampler is an improved balloon-borne device designed to collect particulate matter from very large volumes of stratospheric air at altitudes between 50,000 and 100,000 ft. This equipment utilizes a high-volume blower to pull air through 1 sq ft of Institute of Paper Chemistry (IPC) #1478 filter paper at rates from 400 to 800 cfm. Laboratory tests at low pressures involving aerosols of known size and density, together with intercomparison flights with other sampling devices, indicate that the Direct-Flow Sampler is a very efficient collector of submicron particles. Several vertical profiles of radioactivity over Minneapolis, Minn., that were obtained with impactor collectors and with filter samplers are shown to be in generally good agreement. Development of this sampler was supported by the Atomic Energy Commission as part of a program aimed at achieving a better understanding of the characteristics of stratospheric dust and radioactive debris, and of the mechanisms controlling fallout from the stratosphere.
Abstract
The Direct-Flow Sampler is an improved balloon-borne device designed to collect particulate matter from very large volumes of stratospheric air at altitudes between 50,000 and 100,000 ft. This equipment utilizes a high-volume blower to pull air through 1 sq ft of Institute of Paper Chemistry (IPC) #1478 filter paper at rates from 400 to 800 cfm. Laboratory tests at low pressures involving aerosols of known size and density, together with intercomparison flights with other sampling devices, indicate that the Direct-Flow Sampler is a very efficient collector of submicron particles. Several vertical profiles of radioactivity over Minneapolis, Minn., that were obtained with impactor collectors and with filter samplers are shown to be in generally good agreement. Development of this sampler was supported by the Atomic Energy Commission as part of a program aimed at achieving a better understanding of the characteristics of stratospheric dust and radioactive debris, and of the mechanisms controlling fallout from the stratosphere.
Abstract
The air ejector filter sampler is a balloon-borne device designed to collect particulate matter from very large volumes (105 ft2) of stratospheric air at altitudes between 50,000 and 130,000 ft. This equipment utilize an ejector pump to pull air through 2 ft2 of Institute of Paper Chemistry (IPC) #1478 filter paper at rates on the order of 1000 cfm. Use of this unit has permitted an extension of the U.S. Atomic Energy Commission operational sampling program to higher attitudes than previously allowed by battery powered electro-mechanical systems. Performance of the sampler during a successful operational series conducted in 1965 by the U.S. Air Force at San Angelo, Texas, and Eielson AFB, Alaska, has confirmed pre-program estimates of system reliability.
Abstract
The air ejector filter sampler is a balloon-borne device designed to collect particulate matter from very large volumes (105 ft2) of stratospheric air at altitudes between 50,000 and 130,000 ft. This equipment utilize an ejector pump to pull air through 2 ft2 of Institute of Paper Chemistry (IPC) #1478 filter paper at rates on the order of 1000 cfm. Use of this unit has permitted an extension of the U.S. Atomic Energy Commission operational sampling program to higher attitudes than previously allowed by battery powered electro-mechanical systems. Performance of the sampler during a successful operational series conducted in 1965 by the U.S. Air Force at San Angelo, Texas, and Eielson AFB, Alaska, has confirmed pre-program estimates of system reliability.
