Armando De Los Santos

Apparatus for accurately controlling moisture levels of aqueous surfactant compositions during on line processing including a cross-feed piston assembly

An apparatus for corring aqueous surfactant composition and sampling moisture content wherein the apparatus includes a device for delivering composition to a main collection port; a device for coring the composition in the main collection port to form a sample; a device for delivering the sample into an NMR sensor area; a device for measuring moisture level of the sample in the NMR sensor area; and a device for extracting the sample from the NMR sensor area or returning the sample to a main collection port which includes a cross feed piston assembly.

Nondestructive Characterization of Kevlar Composites Using Pulsed NMR

Nuclear magnetic resonance (NMR) is a branch of spectroscopy based on the interaction between nuclear magnetic dipole moments and a magnetic field. The term “resonance” is used because a natural frequency of the magnetic system, namely, the frequency of gyroscopic precession of the magnetic moment in an applied static magnetic field, is the quantity detected. Typically, the resonance frequency falls in the radiofrequency (RF) region of the electromagnetic spectrum. To implement the NMR method, a static magnetic field is applied to the specimen to polarize the magnetic dipole system and resonance detection is accomplished by coupling a suitable electromagnetic field to the specimen by means of an RF induction coil. Although NMR has been utilized as an investigative tool for many years in physics and chemistry laboratories, only recently has it been seriously considered for NDE of materials.1

PRACTICAL CONSIDERATIONS FOR NMR IN NDT APPLICATIONS

Abstract The range of NMR instruments designed for industrial and other specialised applications are reviewed. This covers both steady state and transient (pulsed) NMR for the measurement of both stationary and flowing materials. Areas covered include sample consideration, magnet design, RF power requirements, probe design and transmit-receive circuits.

Development of piston temperature telemetry system

Abstract The measurement of piston temperature in a reciprocating engine has historically been a very time-consuming and expensive process. Several conditions exist in an engine against which measurement equipment must be protected. Acceleration forces near 2000 Gs occur at Top Dead Center (TDC) in automotive engines at rated speed. Operating temperatures inside the crankcase can range to near 150°C. To allow complete mapping of piston temperature, several measuring locations are required in the piston and data must be obtained under various engine operating conditions. Southwest Research Institute (SwRI) has developed a telemetry-based system that with stands the harsh environments mentioned above. The device is attached to the underside of a piston and temperature data is transmitted to a receiving antenna in the engine crankcase. The key element of this device is a tiny power generator which utilizes the reciprocating motion of the piston to generate electricity, thus allowing the transmitter to be self-powered. Thick-film hybrid circuit construction techniques have been used to keep the package size small. This paper covers the development of the power generator, multiplexer and transmitter circuits, and the receiver system. Sample data is included from two automotive engines.

Explosives Detection — The Case for Magnetic Resonance

Distinctive properties of the hydrogen transient magnetic resonance (HTNMR) response from explosives provide a basis for rapid, selective and sensitive detection of these materials concealed in parcels, letters and airline baggage. Most common high energy and commercial nitrogenous explosives as well as many which do not contain nitrogen, are detectable. Full scale inspection systems based on this technology have demonstrated performance comparable to the best reported for any other method.