Tech Briefs

SiC-Based Miniature High-Temperature Cantilever Anemometer

SiC-Based Miniature High-Temperature Cantilever Anemometer This compact, minimally intrusive sensor functions at temperature as high as 600 °C The figure depicts a miniature cantilever- type anemometer that has been developed as a prototype of compact, relatively nonintrusive anemometers that can function at temperatures up to 600 °C and that can be expected to be commercially mass-producible at low cost. The design of this anemometer, and especially the packaging aspect of the design, is intended to enable measurement of turbulence in the high-temperature, high-vibration environment of a turbine engine or in any similar environment.

Posted in: Briefs, Mechanical Components

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Inlet Housing for a Partial-Admission Turbine

Inlet Housing for a Partial-Admission Turbine The housing is shaped to smooth the inlet flow. An inlet housing for a partial-admission turbine has been designed to cause the inlet airflow to make a smooth transition from an open circular inlet to an inlet slot. The smooth flow is required for purposes of measuring inlet flow characteristics and maximizing the efficiency of the turbine.

Posted in: Briefs, Mechanical Components

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Passivating Stainless Steel Parts

Procedures for commonly used stainless steels can use citric or nitric acid solutions. Maximizing the natural corrosion resistance of parts and components machined from stainless steels. It can make the difference between satisfactory performance and premature failure. Incorrectly performed, passivation can actually induce corrosion.

Posted in: Briefs, Manufacturing & Prototyping

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Laboratory Apparatus Generates Dual-Species Cold Atomic Beam

A pyramidal magneto-optical trap extracts atoms from one chamber into another. A laser cooling apparatus that generates a cold beam of rubidium and cesium atoms at low pressure has been constructed as one of several intermediate products of a continuing program of research on laser cooling and atomic physics. Laser-cooled atomic beams, which can have temperatures as low as a microkelvin, have been used in diverse applications that include measurements of fundamental constants, atomic clocks that realize the international standard unit of time, atom-wave interferometers, and experiments on Bose-Einstein condensation. The present apparatus is a prototype of one being evaluated for use in a proposed microgravitational experiment called the Quantum Interferometric Test of Equivalence (QuITE). In this experiment, interferometric measurements of cesium and rubidium atoms in free fall would be part of a test of Einstein’s equivalence principle. The present apparatus and its anticipated successors may also be useful in other experiments, in both microgravity and normal Earth gravity, in which there are requirements for dual-species atomic beams, low temperatures, and low pressures.

Posted in: Briefs, TSP, Physical Sciences

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Multispectral Scanner for Monitoring Plants

A multispectral scanner has been adapted to capture spectral images of living plants under various types of illumination for purposes of monitoring the health of, or monitoring the transfer of genes into, the plants. In a health-monitoring application, the plants are illuminated with full-spectrum visible and near infrared light and the scanner is used to acquire a reflected- light spectral signature known to be indicative of the health of the plants. In a gene-transfer-monitoring application, the plants are illuminated with blue or ultraviolet light and the scanner is used to capture fluorescence images from a green fluorescent protein (GFP) that is expressed as result of the gene transfer. The choice of wavelength of the illumination and the wavelength of the fluorescence to be monitored depends on the specific GFP.

Posted in: Briefs, Physical Sciences

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Brush/Fin Thermal Interfaces

High thermal conductance sliding interfaces can be achieved.Brush/fin thermal interfaces are being developed to increase heat-transfer efficiency and thereby enhance the thermal management of orbital replaceable units (ORUs) of electronic and other equipment aboard the International Space Station. Brush/fin thermal interfaces could also be used to increase heat-transfer efficiency in terrestrial electronic and power systems.

Posted in: Briefs, Physical Sciences

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Compensating for Effects of Humidity on Electronic Noses

Corrections are derived from outputs of separate humidity and temperature sensors.A method of compensating for the effects of humidity on the readouts of electronic noses has been devised and tested. The method is especially appropriate for use in environments in which humidity is not or cannot be controlled — for example, in the vicinity of a chemical spill, which can be accompanied by large local changes in humidity.

Posted in: Briefs, TSP, Physical Sciences

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