USA As Represented by Secretary of the Navy

Other

Lawrence L Tankersley

John F Reintjes

John E Tucker

Paul L Howard

David G Cooper

James L Dexter

Rita Mahon

Michael D Duncan

Mark Bashkansky

Ronald W Waynant

Thomas M McKenna

Sølve J Fjerdingstad

Martin Chamberlain

A method and system for particle entrained fluid sampling, capable of sampling a high pressure and/or high flow rate fluid flow system using a pressure intensifier for applying pressure or suction to the fluid sample in the fluid sampling system operatively connected to a sample extractor and a sample analysis device. The pressure intensifier for applying pressure or suction is adjustable to provide control over the sample flow in the fluid sampling system. The fluid sampling system of the present invention may be particularly applicable to monitoring the condition of hydraulic and lubrication systems.

Method and apparatus for fluid sampling

A method for in situ sampling and monitoring of a fluid flowing in a flow path, whereby the fluid is to be directed to a chamber a first valve may provide a connection between an inlet to the chamber and the flow path and a second valve may provide a connection between an outlet from the chamber and the flow path, comprising the following steps: a) opening the first valve and the second valve to let the incoming fluid flow through the inlet to the chamber and from the chamber through the outlet into the continuation of the fluid path, thereby allowing fluid to circulate through the chamber for a certain time, b) trapping the fluid in the chamber by closing the second valve and thereafter closing the first valve, c) opening a valvefor reducing pressure, to obtain a pressure in the chamber suitable for monitoring the fluid, d) opening an access valveand leading the fluid trapped in the chamber into a monitor system wherein the fluid is analyzed, and thereby providing the data representing the fluid characteristics, e) providing exit for the fluid analyzed through a further fluid path possibly to a low pressure section of the system.

In situ sampling and monitoring a fluid

A method and apparatus for real-time monitoring of particulates in a fluid. The fluid is illuminated, and an image formed of the interior of the fluid. The image is then detected, and processed to determine the size, shape, etc. of particulates within the fluid.

Real time suspended particle monitor

An apparatus for the time-gated optical examination of objects that are p of, embedded in or viewed through dense scattering materials is disclosed. In a preferred embodiment, the apparatus comprises: a light source for producing a first light pulse and a pump light pulse, each of the first and pump light pulses having a preselected pulse width at a preselected pump wavelength; a Raman generator for shifting the wavelength of the first light pulse to a preselected Stokes wavelength to form Stokes light; a first optical train for transmitting the Stokes light through the dense scattering material to obtain Stokes light comprised of a relatively small, image-bearing signal component including unscattered Stokes light or Stokes light with minimal deviation due to scattering, light followed in time by a relatively large amount of light scattered by the dense scattering material; a Raman amplifier; an optical system for transporting the Stokes light from the dense scattering material to the Raman amplifier; a variable delay path disposed between the light source and the Raman amplifier for varying the transit time of the pump pulse to cause the pump pulse to overlap in time with the signal component of Stokes light at the Raman amplifier, the Raman amplifier only amplifying the signal component of Stokes light that is overlapped in time by the pump pulse; and a two-dimensional detector for detecting the amplified signal component of Stokes light.

Time-gated imaging through dense-scattering materials using stimulated

An unstable resonator laser cavity providing high power radiation with diaction-limited divergence and narrow-bandwidth comprises a gain medium for generating and amplifying laser radiation optically coupled to a reflector via a frequency narrowing element for providing feedback and bandwidth-narrowing of the laser radiation travelling between the gain medium and the reflector. A telescopic ring is optically coupled to the gain medium opposing the reflector. The telescopic ring comprises a polarized beam splitter, which transmits a first polarization polarized laser radiation into the telescopic ring travelling in a first direction and reflects a second polarization polarized laser radiation into the telescopic ring travelling in a second direction; first and second rotators for rotating the first polarization polarized laser radiation to provide second polarization polarized laser radiation travelling in the first direction; and lenses for magnifying the second polarization polarized laser radiation travelling in the first direction onto the polarized beam splitter, which reflects the second polarization polarized laser radiation produced by the first and second rotators back into the gain medium. A scraper mirror, located between the gain medium and the reflector, provides the output beam.

Narrow-bandwidth unstable resonator laser cavity

A laser cavity providing high power laser radiation with diffraction-limi divergence and narrow-bandwidth comprises: a stable laser cavity including a gain medium, which generates and amplifies laser radiation, optically coupled to first and second reflectors and an optical coupler; and an unstable laser cavity including the gain medium, the first reflector, the optical coupler and a scraper mirror. The scraper mirror is located between the gain medium and the optical coupler for producing an output beam. The stable laser cavity is restricted to operate on a low order TEM mode by an aperture located between the optical coupler and the second reflector. A frequency narrowing element located between the optical coupler and the second reflector narrows the bandwidth of the laser radiation in the stable laser cavity. The optical coupler couples the narrow bandwidth laser radiation from the stable laser cavity to the unstable laser cavity, thereby producing narrow bandwidth laser radiation in the output beam.

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Annapolis, MD, United States of America

Lawrence L Tankersley