Test & Measurement

Laser Heating for Testing Rocket-Engine Insulating Phenolic

A continuous-wave CO2 laser has been selected as a source of heat for testing the thermal response of carbon-cloth phenolic like that used as insulating material in a reusable solid-fuel rocket motor (RSRM). The particular thermal response of interest, observed during operation of an RSRM, is pocketing. By suitable adjustment of the size and power of the laser beam, the rate of heating can be made nearly identical to that in the RSRM nozzle during operation.

Posted in: Test & Measurement, Briefs

Read More >>

Software for Testing Access List Integrity

Many networks rely on firewalls or filtering routers for frontline network security. Packet filtering firewalls or routers filter incoming or outgoing packets based on a set of access rules. The IP (Internet Protocol) Packet Generator computer program assists in verifying that a packet filtering firewall is configured correctly, by detecting security holes in the firewall's filtering rules.The IP Packet Generator enables the user to build TCP/IP (Transmission Control Protocol/Internet Protocol) packets and transmit them via the network, to detect errors in access list configuration.The user can specify the source IP address of a packet to simulate attempted access from a remote host. The user can also specify the destination IP address, the type of packet, the destination port number, the size of the packet, the number of packets to send, and the packet rate. Thus, the software helps the user perform an exhaustive test of the access list.

Posted in: Test & Measurement, Briefs

Read More >>

Improved Electrical-Impedance Body-Fluids Monitor

Measurements that yield a variety of data can be done quickly, frequently, and safely. The Johnson Space Center (JSC) body-fluids monitor advances the state of the art of measuring hydration levels in humans during spaceflight. Neither bulky nor heavy, this noninvasive instrument is built around a commercial inductance-capacitance-resistance meter, which is used to obtain electrical-impedance-vs.-frequency data for equivalent-circuit/electrical-components analyses. The instrument is expected to prove invaluable not only in space-flight settings but also in such other settings as veterans' hospitals, clinical facilities, and medical research laboratories.

Posted in: Test & Measurement, Briefs, TSP

Read More >>

Apparatus Measures Thermal Conductance Through a Thin Sample From Cryogenic to Room Temperature

An apparatus allows the measurement of the thermal conductance across a thin sample clamped between metal plates, including thermal boundary resistances. It allows in-situ variation of the clamping force from zero to 30 lb (133.4 N), and variation of the sample temperature between 40 and 300 K. It has a special design feature that minimizes the effect of thermal radiation on this measurement.

Posted in: Test & Measurement, Briefs

Read More >>

Small-Bolt Torque-Tension Tester

Bolts as small as #0–80 can be tested. Current torque-tension measurement techniques involve using load washers as the force measuring transducer. The disadvantage of load washers is that they are too large to be used with fasteners smaller than about size #8. The device described here measures the torque-tension relationship for fasteners as small as #0.

Posted in: Test & Measurement, Briefs, TSP

Read More >>

Desktop Application Program To Simulate Cargo-Air-Drop Tests

The DSS Application is a computer program comprising a Windows version of the UNIX-based Decelerator System Simulation (DSS) coupled with an Excel front end. The DSS is an executable code that simulates the dynamics of air-dropped cargo from first motion in an aircraft through landing. The bare DSS is difficult to use; the front end makes it easy to use. All inputs to the DSS, control of execution of the DSS, and postprocessing and plotting of outputs are handled in the front end. The front end is graphics-intensive.

Posted in: Test & Measurement, Briefs, TSP

Read More >>

Rover Attitude and Pointing System Simulation Testbed

The MER (Mars Exploration Rover) Attitude and Pointing System Simulation Testbed Environment (RAPSSTER) provides a simulation platform used for the development and test of GNC (guidance, navigation, and control) flight algorithm designs for the Mars rovers, which was specifically tailored to the MERs, but has since been used in the development of rover algorithms for the Mars Science Laboratory (MSL) as well.

Posted in: Test & Measurement, Briefs

Read More >>