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Correction for Thermal EMFs in Thermocouple Feedthroughs

Expensive thermocouple-alloy multipin hermetic feedthrough connectors are no longer necessary. A straightforward measurement technique provides for correction of thermal-electromotive- force (thermal-EMF) errors introduced by temperature gradients along the pins of non-thermocouple- alloy hermetic feedthrough connectors for thermocouple extension wires that must pass through bulkheads. This technique is an alternative to the traditional technique in which the thermal-EMF errors are eliminated by use of custom-made multipin hermetic feedthrough connectors that contain pins made of the same alloys as those of the thermocouple extension wires.

Posted in: Briefs, TSP

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Generating Breathable Air Through Dissociation of N2O

Air-supply systems can be made to weigh less and/or operate longer.

Posted in: Briefs

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High-Performance Scanning Acousto-Ultrasonic System

This system reveals flaws that cannot otherwise be detected nondestructively. A high-performance scanning acousto-ultrasonic system, now undergoing development, is designed to afford enhanced capabilities for imaging microstructural features, including flaws, inside plate specimens of materials. The system is expected to be especially helpful in analyzing defects that contribute to failures in polymer- and ceramic-matrix composite materials, which are difficult to characterize by conventional scanning ultrasonic techniques and other conventional nondestructive testing techniques.

Posted in: Briefs, TSP

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Water and Air Measures That Make PureSense

Each day, we read about mounting global concerns regarding the ability to sustain supplies of clean water and to reduce air contamination. With water and air serving as life's most vital elements, it is important to know when these environmental necessities may be contaminated, in order to eliminate exposure immediately.

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Dynamic Pupil Masking for Phasing Telescope Mirror Segments

Piston and tilt adjustments could be performed more efficiently. A method that would notably include dynamic pupil masking has been proposed as an enhanced version of a prior method of phasing the segments of a primary telescope mirror. The method would apply, more specifically, to a primary telescope mirror that comprises multiple segments mounted on actuators that can be used to tilt the segments and translate them along the nominal optical axis to affect wavefront control in increments as fine as a fraction of a wavelength of light. An apparatus (see figure) for implementing the proposed method would be denoted a dispersedfringe- sensor phasing camera system (DPCS).

Posted in: Photonics, Briefs, TSP

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Designer Heart



Posted in: Blog

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Brain Model



Posted in: Blog

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