Sensors & Test

Test & Measurement

Briefs: Test & Measurement
Integrated Structural Analysis and Test Program

An integrated structural-analysis and structure-testing computer program is being developed in order to:

Automate repetitive processes in testing and analysis; Accelerate pre-test analysis;...

Briefs: Test & Measurement
Photodiode-Based, Passive Ultraviolet Dosimeters

Simple, passive instruments have been developed for measuring the exposure of material specimens to vacuum ultraviolet (VUV) radiation from the Sun. Each instrument contains a silicon photodiode and...

Briefs: Test & Measurement
Measuring Radiation Patterns of Reconfigurable Patch Antennas on Wafers

An apparatus and technique have been devised for measuring the radiation pattern of a microwave patch antenna that is one of a number of identical units that have been...

Briefs: Test & Measurement
Hydraulic Apparatus for Mechanical Testing of Nuts

The figure depicts an apparatus for mechanical testing of nuts In the original application for which the apparatus was developed, the nuts are of a frangible type designed for use with pyrotechnic...

Briefs: Test & Measurement
Small Active Radiation Monitor

A device, named small active radiation monitor, allows on-orbit evaluations during periods of increased radiation, after extravehicular activities, or at predesignated times for crews on such long-duration space...

Briefs: Test & Measurement
Portable Electromyograph

A portable electronic apparatus records electromyographic (EMG) signals in as many as 16 channels at a sampling rate of 1,024 Hz in each channel. The apparatus (see figure) includes 16 differential EMG electrodes (each...

Briefs: Test & Measurement
Pressure-Application Device for Testing Pressure Sensors

A portable pressure-application device has been designed and built for use in testing and calibrating piezoelectric pressure transducers in the field. The device generates pressure pulses of...

Briefs: Test & Measurement
Simulating the Structural Behavior of Laminated Glass

This report investigates the strength of archi- tectural laminated glass and the viability of its use for window glass in commercial buildings. Some researchers recommend that the structural...

Briefs: Test & Measurement
A Mass-Spectrometer System for Detecting Gas Leaks

The Hydrogen Umbilical Mass Spectrometer (HUMS) consists of an integrated sample delivery system, a commercial mass-spectrometer- based gas analyzer, and a set of calibration gas mixtures...

Briefs: Test & Measurement
Measuring Contact Angles of a Sessile Drop and Imaging Convection Within It

Figure 1 depicts an apparatus that simultaneously and synchronously records magnified ordinary top-view video images and laser-shadowgraph video images of a sessile drop....

Briefs: Test & Measurement
Measurement of Stresses and Strains in Muscles and Tendons

Miniature fiber-optic-coupled sensors based on optically excited, self-resonant microbeams are being developed for measuring stresses and strains within muscle fascicles and tendons. These...

Briefs: Test & Measurement
Optical Measurement of Temperatures in Muscles and Tendons

Miniature fiber-optic-coupled sensors based on optically excited, self-resonant microbeams have been proposed for measuring temperatures within muscle fascicles and tendons. The proposed...

Briefs: Test & Measurement
Small Low-Temperature Thermometer With Nanokelvin Resolution

An improved high-resolution thermometer (HRT) for use in scientific experiments at temperatures

Briefs: Test & Measurement
A Lightweight Ambulatory Physiological Monitoring System

The Autogenic-Feedback System-2 (AFS-2) is a biomedical instrumentation package that was designed and built at Ames Research Center for use during the September 1992 Spacelab-J (STS-47)...

Briefs: Test & Measurement
Improvements in a Lightning-Measuring Instrument

Some improvements have been made in the instrument described in "Instrument Records Magnetic Fields Generated by Lightning" (KSC-11769) NASA Tech Briefs, Vol. 19, No. 4 (April 1995), page 38. To...

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