Abstract: A single-wavelength light source is configured to generate an excitation light source. A sample holder that defines an inner cavity is capable of holding a sample and includes a surface transparent to the excitation light source. One or more mounts are attached to at least one of the light source or the sample holder. The mounts are configured to change an incident angle of the excitation light source on the surface. One or more optical components are positioned in a path of a fluorescence emission emitted from the surface and guide the fluorescence emission to a detector. A detector detects an intensity of the fluorescence emission.

Abstract: A single-wavelength light source is configured to generate an excitation light source. A sample holder that defines an inner cavity is capable of holding a sample and includes a surface transparent to the excitation light source. One or more mounts are attached to at least one of the light source or the sample holder. The mounts are configured to change an incident angle of the excitation light source on the surface. One or more optical components are positioned in a path of a fluorescence emission emitted from the surface and guide the fluorescence emission to a detector. A detector detects an intensity of the fluorescence emission.

Abstract: Systems and methods include a fluorescence measurement apparatus. A single-wavelength light source generates an excitation light source. A sample holder holds a sample and includes a surface transparent to the excitation light source. Mounts attached to the single-wavelength light source(s) or the sample holder change an incident angle of the excitation light source on the surface. Optical components positioned in a path of a fluorescence emission emitted from the surface guide the fluorescence emission to a detector that obtains spectra from at least first and second angles-of-incidence. A device records spectra obtained by the detector from the first and second angles-of-incidence, normalizes and analyzes intensities of the spectra, subtracts a first spectrum corresponding to the first angle-of-incidence from a second spectrum corresponding to the second angle-of-incidence to obtain a difference, identifying a sample type of the sample based on an API gravity mapped to the difference.

Abstract: Systems and methods include a fluorescence measurement apparatus. A single-wavelength light source generates an excitation light source. A sample holder holds a sample and includes a surface transparent to the excitation light source. Mounts attached to the single-wavelength light source(s) or the sample holder change an incident angle of the excitation light source on the surface. Optical components positioned in a path of a fluorescence emission emitted from the surface guide the fluorescence emission to a detector that obtains spectra from at least first and second angles-of-incidence. A device records spectra obtained by the detector from the first and second angles-of-incidence, normalizes and analyzes intensities of the spectra, subtracts a first spectrum corresponding to the first angle-of-incidence from a second spectrum corresponding to the second angle-of-incidence to obtain a difference, identifying a sample type of the sample based on an API gravity mapped to the difference.

Abstract: An opto-mechanical apparatus including a hollow housing member having a first end and a second end, the housing member having a longitudinal axis, a parabolic mirror positioned on a side of to the first end of the housing member, and a mirror adjustment mechanism attached to the second end of the housing member, the mirror adjustment mechanism connected to the parabolic mirror through the housing member, the mirror adjustment mechanism configured to adjust an axial position of the parabolic mirror along the longitudinal axis and to adjust a radial position of the parabolic mirror about the longitudinal axis.

Abstract: An optical signal source is positioned at a first side of the flow cell or the flow-line bypass. The optical signal source is capable of emitting an optical signal through the first side of the flow cell or the flow-line bypass. A first optical detector is positioned at a second side of the flow cell. The second side is opposite the first side. The first optical detector is capable of detecting a transmitted-light intensity of the optical signal transmitted through the second side of the flow cell or the flow-line bypass. A second optical detector is positioned at a third side of the flow cell. The third side is different than the first side and the second side. The second optical detector is capable of detecting a scattered-light intensity of a scattered optical signal transmitted through the third side of the flow cell or the flow-line bypass.

Abstract: A single-wavelength light source is configured to generate an excitation light source. A sample holder that defines an inner cavity is capable of holding a sample and includes a surface transparent to the excitation light source. One or more mounts are attached to at least one of the light source or the sample holder. The mounts are configured to change an incident angle of the excitation light source on the surface. One or more optical components are positioned in a path of a fluorescence emission emitted from the surface and guide the fluorescence emission to a detector. A detector detects an intensity of the fluorescence emission.

Abstract: A single-wavelength light source is configured to generate an excitation light source. A sample holder that defines an inner cavity is capable of holding a sample and includes a surface transparent to the excitation light source. One or more mounts are attached to at least one of the light source or the sample holder. The mounts are configured to change an incident angle of the excitation light source on the surface. One or more optical components are positioned in a path of a fluorescence emission emitted from the surface and guide the fluorescence emission to a detector. A detector detects an intensity of the fluorescence emission.

Abstract: To characterize hydrocarbon contamination, a container, an ultraviolet laser source and a detector are spatially positioned relative to each other. The container carries a hydrocarbon sample including a first hydrocarbon and a second hydrocarbon. The ultraviolet laser source is configured to emit an ultraviolet laser at a wavelength to irradiate the hydrocarbon sample in the container. The wavelength is configured to induce fluorescence in the hydrocarbon sample. The detector is configured to detect the induced fluorescence. The hydrocarbon sample in the container is irradiated with the ultraviolet laser at multiple locations within the container at respective multiple distances from the detector. The multiple locations are arranged in a straight line normal to the detector.

Abstract: A single-wavelength light source is configured to generate an excitation light source. A sample holder that defines an inner cavity is capable of holding a sample and includes a surface transparent to the excitation light source. One or more mounts are attached to at least one of the light source or the sample holder. The mounts are configured to change an incident angle of the excitation light source on the surface. One or more optical components are positioned in a path of a fluorescence emission emitted from the surface and guide the fluorescence emission to a detector. A detector detects an intensity of the fluorescence emission.

Abstract: A single-wavelength light source is configured to generate an excitation light source. A sample holder that defines an inner cavity is capable of holding a sample and includes a surface transparent to the excitation light source. One or more mounts are attached to at least one of the light source or the sample holder. The mounts are configured to change an incident angle of the excitation light source on the surface. One or more optical components are positioned in a path of a fluorescence emission emitted from the surface and guide the fluorescence emission to a detector. A detector detects an intensity of the fluorescence emission.

Abstract: An opto-mechanical apparatus including a hollow housing member having a first end and a second end, the housing member having a longitudinal axis, a parabolic mirror positioned on a side of to the first end of the housing member, and a mirror adjustment mechanism attached to the second end of the housing member, the mirror adjustment mechanism connected to the parabolic mirror through the housing member, the mirror adjustment mechanism configured to adjust an axial position of the parabolic mirror along the longitudinal axis and to adjust a radial position of the parabolic mirror about the longitudinal axis.

Abstract: An opto-mechanical apparatus including a hollow housing member having a first end and a second end, the housing member having a longitudinal axis, a parabolic mirror positioned on a side of to the first end of the housing member, and a mirror adjustment mechanism attached to the second end of the housing member, the mirror adjustment mechanism connected to the parabolic mirror through the housing member, the mirror adjustment mechanism configured to adjust an axial position of the parabolic mirror along the longitudinal axis and to adjust a radial position of the parabolic mirror about the longitudinal axis.

Abstract: This disclosure describes a cuvette holder. The cuvette holder includes a base and a body extending from the base. The body includes a first wall, and the body defining an interior cavity. A first aperture extends through the first wall of the body. The first aperture can have a width measured parallel to the base of between 12 and 12.6 millimeters.

Abstract: Embodiments of the present disclosure describe a method for determining a property of an uncharacterized crude oil sample using a polynomial equation correlating the property to a spectrum index and density of crude oil. The polynomial equation may include constants determined using a data fitting method and a data base of spectral data, density data, and standard properties data of a plurality of crude oils.

Abstract: An opto-mechanical apparatus including a hollow housing member having a first end and a second end, the housing member having a longitudinal axis, a parabolic mirror positioned on a side of to the first end of the housing member, and a mirror adjustment mechanism attached to the second end of the housing member, the mirror adjustment mechanism connected to the parabolic mirror through the housing member, the mirror adjustment mechanism configured to adjust an axial position of the parabolic mirror along the longitudinal axis and to adjust a radial position of the parabolic mirror about the longitudinal axis.

Abstract: Methods and systems use fluorescence to determine specific gravity of samples. A first light pulse is applied to a sample at a first angle-of-incidence. A second light pulse is applied to the sample at a second angle-of-incidence. A first ratio based on the intensity of a first fluorescence emission over a first time interval and the intensity of the first fluorescence emission over a second time interval is calculated. A second ratio based on the intensity of a second fluorescence emission over a third time interval and the intensity of the second fluorescence emission over a fourth time interval is calculated. An intensity ratio based on the first ratio and the second ratio is calculated. A specific gravity of the sample based on the intensity ratio is determined.

Abstract: Methods, systems, and apparatus to diagnose lubrication oil deterioration. In one aspect, a method includes irradiating a lubrication oil sample with a light beam to emit a light-induced fluorescence, detecting and processing the light-induced fluorescence signal to determine a temporal variation of a fluorescence intensity, identifying a steady state of the light-induced fluorescence signal, processing the temporal variation of the fluorescence intensity to determine a lubrication oil parameter, and correlating the oil parameter to a calibration curve to diagnose the lubrication oil deterioration.

Abstract: An opto-mechanical apparatus including a hollow housing member having a first end and a second end, the housing member having a longitudinal axis, a parabolic mirror positioned on a side of to the first end of the housing member, and a mirror adjustment mechanism attached to the second end of the housing member, the mirror adjustment mechanism connected to the parabolic mirror through the housing member, the mirror adjustment mechanism configured to adjust an axial position of the parabolic mirror along the longitudinal axis and to adjust a radial position of the parabolic mirror about the longitudinal axis.

Abstract: Methods, media, and devices for determining the deterioration of an oil by determining the viscosity of the oil from fluorescence rise-time are provided. A sample of an oil from a machine may be obtained. The oil sample may be irradiated using a light source such a laser to induce fluorescence in the oil sample. The induced fluorescence may be filtered and collimated before being detecting by a photodiode. The relative intensity of the fluorescence may be measured over a time period at a sample rate and used to determine the fluorescence rise-time of the oil sample. The viscosity of the oil sample may be determined from the fluorescence rise-time. The determined viscosity may be compared to viscosity threshold value to determine the deterioration of the oil.