A gas analysis device includes: a light emitter that irradiates, with a measurement beam, a gas flowing in piping; a processor that analyzes components contained in the gas based on an absorption spectrum of the measurement beam passing through the gas; a probe that covers the optical path of the measurement beam; and a window through which the measurement beam passes and that blocks off a hollow portion of the probe from the gas.

A sensor platform for the assessment of the condition and quality of fluids while in service is based on a combination of solid-state light sources (LEDs) and detectors housed within a single integrated package. The sensor platform configured to be standalone in operation and comprises interfacing optics and acquisition and processing electronics. The sensor platform is configured to obtain inputs from multiple stimulus points and correlates these to changes in the overall composition or condition of the fluid. The sensing method can be described as a combination of a differential sensor, by monitoring changes from the normal status of the fluid, and an inferential sensor where changes are interpreted in terms of global impact rather than specific localized changes in component concentration.

A spectroscopic assembly may include a spectrometer. The spectrometer may include an illumination source to generate a light to illuminate a sample. The spectrometer may include a sensor to obtain a spectroscopic measurement based on light, reflected by the sample, from the light illuminating the sample. The spectroscopic assembly may include a light pipe to transfer the light reflected from the sample. The light pipe may include a first opening to receive the spectrometer. The light pipe may include a second opening to receive the sample, such that the sample is enclosed by the light pipe and a base surface when the sample is received at the second opening. The light pipe may be associated with aligning the illumination source and the sensor with the sample.

A measurement apparatus includes a sensor probe and a circuit housing. The sensor probe is insertable through an opening provided in a flow path wall of a flow path through which a fluid to be measured flows and is used in a predetermined orientation relative to the flow direction of the fluid to be measured. The circuit housing includes a display, disposed outside of the flow path, and connects to the sensor probe. The circuit housing is fixable at a plurality of rotation positions relative to the sensor probe about an axis along the insertion direction of the sensor probe. The measurement apparatus allows the display direction of the display to be selected regardless of the orientation of the sensor probe.

A method of making a polyetherimide including: setting a target range for the anhydride-amine stoichiometry in a reaction mixture; combining a solvent, a diamine, a bis(ether anhydride), and an optional end capping agent to form the reaction mixture wherein the reaction mixture has a polyamic acid content; analyzing the amine and anhydride end group content of the reaction mixture using near infrared vibrational spectroscopy; calculating the anhydride-amine stoichiometry; comparing the calculated anhydride-amine stoichiometry to the target stoichiometry, and, when necessary, adjusting the concentration of bis(ether anhydride) or diamine based on the comparison of the calculated anhydride-amine stoichiometry to the target stoichiometry.

A sensor for monitoring the quality of oil in mechanical machinery is provided. The sensor includes a portion that is sealed from the oil which contains electric circuitry to process signals received from the sensing elements. Another portion of the sensor is exposed to the oil and contains one or more sensing elements to sense one or more properties of the oil. The sensed properties may include electrical properties, temperature properties and/or optical properties.

The present invention relates to a probe unit comprising a probe (2) having a probe window (3) having a contact surface for facing a high pressure fluid flow, the probe unit comprising a probe housing (1) containing the probe including the probe window, the probe being moveable relative to the probe housing between a first position wherein the window is exposed to the fluid flow and a second position wherein the probe is enclosed by said housing and a space (11) is defined between said housing and said probe, said housing having an outer part into said fluid flow, said probe unit comprising sealing means (4, 5, 7) adapted to seal said defined space from said fluid flow when the probe is in said second position. The probe unit also comprises pressure adjustment means for reducing the pressure within said space and cleaning means (6, 9) for cleaning said probe when within said space.

The present invention relates to a self-cleaning probe for performing optical measurements in a gas or liquid flow. The probe comprises a measuring cell defining a passage for the gas or liquid to be measured to pass through, and includes minimum a first and second optical interface on opposite sides of the passage. The probe further comprises at least one optical light source emitting an optical signal and a detector for receiving an optical signal having propagated partly or fully through the gas or liquid flow from the first to the second interface. All optical interfaces are acoustically coupled to one acoustic transducer connected to a power source, adapted to produce vibrations in the frequency range of 5 kHz-1 MHz, the vibrations being substantially perpendicular to the plane of the interfaces and the acoustic energy exceeding the cavitation threshold in a liquid, so as to remove deposits on the optical interfaces.

A low-temperature safe sensor package. The package includes a housing having an internal cavity, an inlet port in communication with the internal cavity and a fluid source, and an outlet port in communication with the internal cavity. A sensor carrier is moveably arranged within the internal cavity. A spring element is arranged between the sensor carrier and a portion of the housing for biasing the sensor carrier into an operating position within the internal cavity.

A gas analysis device includes a probe tube, a flange, an optical system member, and heaters. The probe tube includes an optical path through which measurement light is projected onto a prescribed measurement region of a sample gas flowing through a flue and/or is received from the measurement region. The flange is fixed to the outer periphery of the probe tube and is attached to a pipe side wall. The optical system member projects measurement light onto the sample gas S within the measurement region and/or receives measurement light from the measurement region. The heaters are disposed within the flange and heats the portion where the probe tube and flange are fixed to each other.