A flow cell including a flow cell bod having a flow path formed therein; an optically transmissive member disposed at a part wherein light from the light source is incident into, or emitted from, the flow path; a shock absorbing member that is disposed between the optically transmissive member and the cell body; an elastic member, made from a metal material, for pressing the optically transmissive member toward the cell body side; and a fastening tool, attached to the cell body, for positioning the elastic member.

An apparatus used for analysis of a fluid-based system that includes a main chamber consisting of an optically transparent high strength material that ensures transmission of infrared and ultraviolet wavelengths and is capable of withstanding high pressures. The apparatus also includes first and second fluid tight endcaps attached to first and second ends of the main chamber, wherein the first endcap permits entry of a fluid into the main chamber and the second endcap permits the fluid to exit the main chamber. The apparatus further includes a fixed filter guide rail located inside the main chamber and attached to one of the end caps, and a filter located inside the main chamber and configured to removably attach to the fixed filter guide rail, wherein the filter is capable of capturing residue or contaminants in the fluid.

A measuring device can be used under high pressure and can measure impurity particles contained in a hydraulic oil with high accuracy. A flow path hole opening on two facing surfaces of a housing has flat side surfaces. A cavity opens on the side surface, and a cavity opens on the side surface. Light emitted from a light irradiating section irradiates a hydraulic oil flowing in the flow path hole, via a cell disposed in the cavity in a direction substantially orthogonal to a center axis. Light passing through the hydraulic oil is received by a light receiving section via a cell disposed in the cavity opening on the side surface.

A system and method for maintaining the face of an optical window at a desired axial position with respect to the face of a high pressure housing, suitable for use in a high pressure optical flow cell for a real time optical particle monitoring system. The window fits within a mounting hole that extends through the pressure housing. The window has a smaller-diameter cylindrical end portion extending to the high pressure side and an opposite larger-diameter cylindrical end portion, with a shoulder between the cylindrical end portions. A threaded retaining member axially compresses a gasket, o-ring, or other compliant sealing member between the shoulder of the optical window and a corresponding shoulder in the mounting hole, creating a static seal and maintaining the high pressure face of the optical window at a desired position over a wide range of temperatures and pressures.

The invention relates to a contamination recording apparatus (12) for recording contaminations in a flowing hydraulic fluid (10) to be examined in aircraft (11a), which comprises a conveying device (14) for conveying the flowing hydraulic fluid (10), a light source (34) for exposing the hydraulic fluid (10) flowing in the conveying device (14) to light (46), and a detection device (36) for recording a fraction of the light (46) absorbed by the exposed hydraulic fluid (10), the light source (34) being formed in order to emit light (46) having a wavelength in the near-infrared range. The invention furthermore relates to a hydraulic system (11) equipped with such a contamination recording apparatus (12) and to an aircraft (11a), and also to a method for recording contaminations in a hydraulic fluid (10) flowing in a hydraulic system (11) of an aircraft (11a).

A spectroscopic measuring device for minimizing spurious absorption due to undesired gases. The device includes a probe body, or a transmission cell formed from a central measurement cell and first and second probe bodies. Each probe body is subject to leakage of undesired gas, especially over time in the presence of high pressure gas. Each probe body includes a bore located between a primary window disposed at or near a distal end and a secondary window located at or near the proximal end. It being observed that the absorbance is proportional to the pathlength and inversely proportional to the volume as long as the pressure in the probe body remains low compared to that in the measurement cell, a glass filler rod is located in the bore and a is void located adjacent to the filler glass rod, thereby minimizing spurious absorption even in the presence of leakage.

A system and method for determining impurities in a beverage grade gas such as CO.sub.2 or N.sub.2 relies on FTIR gas analysis for measuring non-sulfur impurities as well as SO.sub.2. CO.sub.2% also can be determined. A multiplexer selects a sample gas from multiple gas samples. Conversion of reduced sulphur present in some impurities to SO.sub.2 is conducted in an oxidizing furnace. Climate control and measurements of oxygen gas impurities also can be provided.

Processes and systems for monitoring one or more gases dissolved in a liquid. In some embodiments, the process can include introducing a fluid into an inlet of a sample cell, where the fluid includes at least one gas dissolved in a liquid. The fluid can flow through the sample cell such that at least a portion of the fluid flows past an optical window such that the fluid is viewable within the sample cell through the optical window. The fluid can be recovered from an outlet of the sample cell. An electromagnetic radiation signal can be emitted into the sample cell through the optical window for at least a portion of the time the fluid is viewable through the optical window. The fluid can be contacted with the electromagnetic radiation signal within the sample cell. A scattered electromagnetic radiation signal that can include elastic scattered radiation and inelastic scattered radiation emitted from the sample cell through the optical window can be directed into a filter to remove at least a portion of the elastic scattered radiation to produce a primarily inelastic scattered radiation signal. The primarily inelastic scatted radiation signal can be directed to a detector to detect a Raman signal indicating the presence of the at least one dissolved gas in the liquid.

A system is presented. The system includes an electromagnetic radiation source configured to generate a mode-matched electromagnetic radiation that irradiates a gas-mixture filled in a gas compartment at a determined pressure P bars, an intensity enhancement mechanism that internally reflects the mode-matched electromagnetic radiation a plurality of times to achieve an effective intensity E, of reflected electromagnetic radiation in a region of interest, that is N times an intensity of the mode-matched electromagnetic radiation, and a detection subsystem that analyses the gas-mixture based upon Raman scattered photons emitted from the region of interest, wherein a product of the P and the N is at least 30.

A system and method for maintaining the face of an optical window at a desired axial position with respect to the face of a high pressure housing, suitable for use in a high pressure optical flow cell for a real time optical particle monitoring system. The window fits within a mounting hole that extends through the pressure housing. The window has a smaller-diameter cylindrical end portion extending to the high pressure side and an opposite larger-diameter cylindrical end portion, with a shoulder between the cylindrical end portions. A threaded retaining member axially compresses a gasket, o-ring, or other compliant sealing member between the shoulder of the optical window and a corresponding shoulder in the mounting hole, creating a static seal and maintaining the high pressure face of the optical window at a desired position over a wide range of temperatures and pressures.