Filter cassette for high volume air sampler
Filter cassette eliminates or substantially reduces contamination of filter media by extraneous material and facilitates handling.
King, R. B.↗
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Results for “sampler”
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Electrons in quiet-time increases, samplers of conditions in the outer solar system
An explanation for quiet-time electron increases is proposed which predicts as the existence of a modulating region for cosmic ray particles lying at approximately 30 AU from the Sun.
Fisk, L. A.↗
Examination of the Surveyor 3 surface sampler scoop
The operation and external appearance of the surface sampling scoop are discussed. An attempt was made to measure the magnitude of the existing adhesion between the lunar soil and the various surfaces of the scoop.
Scott, R. F.↗
Martian gas, soil sampler tested.
A gas chromatograph mass spectrometer (GCMS) is scheduled to be carried aboard the Mars Viking lander, which is to make a soft landing on the Martian surface. The GCMS has two distinct tasks including a sampling of the Martian atmosphere and an analysis of Martian soil. The instrument is designed to be highly sensitive. It can detect 0.1 part per million of organic compounds in the soil and from 10 to 100 parts per million of atmospheric constituents.
Miller, B.↗
Atmospheric particle sampler
Positive and/or negative pressure is used to trap airborne particles against a filter. Positive pressure is provided by low molecular weight gas (He or H) to achieve high particle velocity and high capture percentage. Trapped particles are examined under electron microscope.
Miller, C. G.↗
Portable, wind sensitive, directional air sampler
Air Scout unit has preset timer that controls length of time filter slides are in sampling position. At end of sampling period, fresh slide is automatically moved into position, and exposed filter is displaced into storage compartment. Device may be set up, loaded, programmed, and left to acquire samples automatically.
Deyo, J. N.↗
Sampler of gas borne particles
An atmosphere sample is described which includes a very thin filter element with straight-through holes on the order of 1 micron. A sample of air with particles to be examined is driven by means of a pressurized low molecular weight gas, e.g., He to the filter element front side. A partial vacuum may be present at the back side of the filter element. The pressure differential across the filter element is just below the rupture point of the filter element. Particles smaller than filter holes are deposited on the filter element. When using a filter element of plastic material of a thickness on the order of 10 microns, a stainless steel back-up plate and a diffusion member are used to support the filter element when subjected to a pressure differential on the order of a few hundred atmospheres.
Miller, C. G.↗
A balloon ozone measurement utilizing an optical absorption cell and an ejector air sampler
Stratospheric ozone was measured from a balloon utilizing an ultraviolet absorption cell. The ambient air was sampled by means of an aspirator attached to the output end of the optical cell. A nominal ozone distribution was obtained from 16 km to the float altitude of 38 km.
Hilsenrath, E.↗
Three-level signal sampler has automatic threshold
Statistical errors introduced by D-to-A conversion are reduced.
Brokl, S. S.↗
Automated syringe sampler
Device is designed primarily for remotely collecting field samples of water or air from polluted sources or from tracer gases used to track such sources over long distances.
Purgold, G. C.↗
Safe, durable soil sampler
Soil sampling tool protects user from injury and resists effects of weather and hard use. Penetrometer has uses in construction, surveying, geological research and similar applications.
Durrant, R. D.↗
A diffusion model for use with directional samplers
The paper presents a mathematical model for describing dispersion processes of airborne particles in the atmosphere. The process is described as a superposition of independent Brownian motion processes with drifts and a boundary at zero. It is assumed that the terrain is flat and of a homogeneous roughness. All sources are assumed to be point sources. The time dependencies of emission rates, wind speed, wind direction, and atmospheric conditions are taken into account.
Anbar, D.↗
Time variation of urban mass loading measured by small filters compared to high-volume samplers
The paper shows how the use of an instrument with 12 small-diameter (47-mm) membrane filters (samples taken for 12 2-hr periods), in conjunction with wind direction measurements, is a suitable technique for observing mass loading levels on a time-resolved basis. In contrast, standard high-volume instruments are unable to demonstrate specialized events because of the long collection period involved. A comparison is presented for a typical day where the mass loading changed during the observed period but could not be observed with a single high-volume sample measurement. Time-averaged mass loading for 2-hr periods is demonstrated to be a useful tool in developing trend analysis for diurnal effects.
Crumbly, K. H.↗
Multispectral Resource Sampler (MPS): Proof of Concept. Literature survey of atmospheric corrections
Work done in combining spectral bands to reduce atmospheric effects on spectral signatures is described. The development of atmospheric models and their use with ground and aerial measurements in correcting spectral signatures is reviewed. An overview of studies of atmospheric effects on the accuracy of scene classification is provided.
Schowengerdt, R. A.↗
Automated syringe sampler
A number of sampling services are disposed in a rack which slides into a housing. In response to a signal from an antenna, the circutry elements are activated which provide power individually, collectively, or selectively to a servomechanism thereby moving an actuator arm and the attached jawed bracket supporting an evaculated tube towards a stationary needle. One open end of the needle extends through the side wall of a conduit to the interior and the other open end is maintained within the protective sleeve, supported by a bifurcated bracket. A septum in punctured by the end of the needle within the sleeve and a sample of the fluid medium in the conduit flows through the needle and is transferred to a tube. The signal to the servo is then reversed and the actuator arm moves the tube back to its original position permitting the septum to expand and seal the hole made by the needle. The jawed bracket is attached by pivot to the actuator to facilitate tube replacement.
Purgold, G. C.↗
Mobile sampler for use in acquiring samples of terrestrial atmospheric gases
Samples of terrestrial atmospheric gasses from a free body of such gasses using a device characterized by a plurality of tubular bodies adapted to be mounted in side by side relation on a motorized highway vehicle in mutual parallelism with the axis of the normal path of travel for the vehicles. Each of the bodies is of a cylindrical configuration and has an axial opening at each of its opposite ends through which a linear flow path is defined. A pair of pivotally supported, spring-biased sealing caps is mounted adjacent to the ends of the body and continuously urged into a hermetic sealing relationship. A restraint for securing the caps against spring-urged pivotal displacement, includes a separable, normally tensioned line interconnecting the caps and an operable release mechanism for simultaneously releasing the caps for spring-urged displacement. A hot wire cutter is included for separating the line, whereby samples of air are trapped in the body as the caps are spring-driven to assume an hermetically sealed relation with the openings defined in each of the opposite ends of the body.
Tucker, C. E.↗
Induced Environment Contamination Monitor (IECM), air sampler - Results from the Space Transport System (STS-2) flight
An investigation involving sampling the rapidly changing environment of the Shuttle cargo bay is considered. Four time-integrated samples and one rapid acquisition sample were collected to determine the types and quantities of contaminants present during ascent and descent of the Shuttle. The sampling times for the various bottles were controlled by valves operated by the Data Acquisition and Control System (DACS) of the IECM. Many of the observed species were found to be common solvents used in cleaning surfaces. When the actual volume sampled is taken into account, the relative mass of organics sampled during descent is about 20 percent less than during ascent.
Peters, P. N.↗
Accurate Airborne Particle Sampler
Air inducted isokinetically into centrifugal collector. Cloud drop collector accurately and efficiently samples droplets and rejects aerosol particles. Number of these collectors connected in series, each designed that largest size fraction of droplets captured in first one and successively smaller size fractions captured in others. By analyzing each size fraction, chemical composition of cloud droplets related to drop size.
Miller, I. M.↗