The present disclosure relates to a measuring apparatus for analyzing a measuring medium. The measuring apparatus includes a probe housing, a radiation source, and coupling and decoupling optics. The optics have a measurement window in the probe housing to direct radiation of the radiation source into a measuring region outside the probe housing and including the measuring medium, and to block measuring radiation from the measuring region. Via the optics, a receiving device detects measuring radiation and generates output data. An additional physical or chemical sensor is integrated into the probe housing and is designed to detect a measurand of the measuring medium and output measurement signals. An electronic measurement unit is configured to collect and process the output data of the receiving device and the measurement signals of the additional physical or chemical sensor.

An in-situ photocatalysis monitoring system based on surface-enhanced Raman Scattering (SERS) spectroscopy. The monitoring system may include a Raman excitation light source, a laser coupling lens, a narrow band filter, a total reflection mirror, a dichroic mirror, a focusing coupling lens, a SERS optical fiber probe, a liquid phase photocatalysis reactor, a photocatalytic light source, a Raman collection lens, and a spectrometer. A first furcation part and a second furcation part each extend from one end of a common detection part of the SERS optical fiber probe; an extending end of the first furcation part is coupled with the focusing coupling lens; an extending end of the second furcation part is coupled with the photocatalytic light source; and the other end of the common detection part is arranged inside the liquid phase photocatalysis reactor. Raman excitation light and photocatalytic light may be transmitted on a common channel.

The present invention provides a method and device for on-line detection of the salinity of seawater. A sweep frequency synchronous signal controls a sweep frequency laser light source such that the wavelength of a frequency modulation light wave output by the sweep frequency laser light source is a periodic saw-tooth wave signal. The frequency modulation light wave is divided into two beams, respectively transmitted to a refractive index probe and a temperature probe in seawater. The refractive index probe is an interference instrument structure, and the frequency value of an interference light intensity signal fed back by the refractive index probe is related to the refractive index of seawater. The refractive index of seawater is calculated by performing discrete Fourier transformation on the interference light intensity signal. The temperature probe is internally provided with a fiber Bragg grating, and the Bragg wavelength of the reflection spectrum of the temperature probe is related to the temperature of the seawater. The sweep frequency synchronous signal and the reflection light intensity signal of the fiber Bragg grating are subjected to synchronous discrete sampling, and the temperature value of the seawater is calculated according to a grating temperature sensor demodulation algorithm. The salinity value of the detected seawater is obtained by solving an empirical equation according to the obtained refractive index, the temperature value and the average wavelength of the frequency modulation light wave, thereby implementing on-line detection of the salinity of seawater.

A downhole fluid analysis system includes an optical sensor comprising, which includes a light source configured to emit light comprising a plurality of wavelengths, a light detector, and an optical tip through which at least a portion of the light travels and returns to the detector, wherein the incident angle of the light causes total internal reflection within the optical tip. The system further includes a piezoelectric helm resonator that generates a resonance response in response to an applied current, and an electromagnetic spectroscopy sensor positioned symmetrically with respect to the piezoelectric helm resonator in at least one direction. The light may be reflected in the optical tip at one or more reflection points, and each reflection point may generate an evanescent wave in a medium surrounding the optical tip. The light may be internally reflected in the optical tip at a plurality of reflection points.

A handheld hemoglobin detecting device has a housing assembly including a holding base, a tubular housing and a liquid holder, a control module disposed on the housing assembly, and a lighting assembly mounted in the tubular housing and including a light emitting module, a light concentrator, and a light guide. At least one light beam emitted from the light emitting module passes through and is concentrated by the light concentrator to shine on the liquid holder, is reflected by a light reflector that is disposed in the liquid holder, enters the light guide, and is transmitted to a light sensor. The handheld hemoglobin detecting device has a simplified structure and is easy to assemble, and thus is light and has low manufacturing cost. Moreover, a lower accuracy in assembling the lighting assembly can be tolerated.

A system for measuring the blood loss comprises a measuring device that determines a hemoglobin concentration of fluid within a container utilizing a light source and a light detector. The container receives blood and other fluids from a patient during a medical procedure. Light from the light source is passed through the blood and other fluids in the container and is detected by the light detector. Based upon a magnitude of light detected, a hemoglobin concentration of the fluid in the container can be determined. A volume-measuring device determines the volume of blood and fluid in the container. Knowing the hemoglobin concentration and volume of fluid in the container, the volume of patient blood loss in the container can be determined. The blood loss measuring device in combination with infusion systems maintains a real-blood volume status so that proper infusion of blood, crystalloid and/or colloid solutions occurs.

The present disclosure relates to systems and methods for analyzing fluids. The method for analyzing a chemical sample within a wellbore, contained within an interrogation device, may comprise broadcasting a coherent light from a frequency comb module, directing the coherent light through a fiber optic line to the interrogation device, irradiating the chemical sample with the coherent light, capturing light resulting from the irradiation of the chemical sample, and producing a spectrum resulting from the captured light from the chemical sample. A frequency comb system for analyzing a chemical sample may comprise a frequency comb module configured to broadcast a coherent light and a fiber optic line that extends into a wellbore to an interrogation device. The interrogation device may further be configured to contain the chemical sample for irradiation by the coherent light. The frequency comb system may further comprise a receiver and an information handling system.

A fluoride sensor includes an aluminum layer situated on a distal end face of an optical fiber. A light source directs light into the optical fiber at a proximal end and reflected light from the aluminum layer at the distal end face is directed by the fiber to a detector. A rate of change of a detector signal is processed to produce an estimate of a concentration of fluoride.

A sensor system for sensing contaminants within a fluid stream of a fluid system includes a sensor body and an arm extending from the sensor body to a distal end of the arm, a laser light source configured to direct a laser beam outwardly from an outlet of the sensor body, and a light sensor. A fiber optic light guide is disposed in the sensor body and extends from the light sensor to an inlet of the sensor body for directing light to the light sensor. A beam dump is positioned at the distal end opposite the laser light source to absorb at least a portion of the laser beam directed towards the distal end. A blocking member of the arm is disposed intermediate between the sensor body and the distal end and is configured to partially restrict a field of intake of light at the inlet.

An optical sensing system for sensing hydrogen in a fluid comprising a first optical sensor comprising a first optical fiber, wherein an end portion of the first optical fiber is coated with a first hydrogen-sensitive multilayer on an end surface perpendicular to a longitudinal axis of the first optical fiber, the first multilayer being adapted to change its optical properties dependent on a hydrogen partial pressure in the fluid and dependent on a temperature of the fluid, with a known first characteristic; a second optical sensor comprising a second optical fiber, wherein an end portion of the second optical fiber is coated with a second hydrogen-sensitive multilayer on an end surface perpendicular to the longitudinal axis of the second optical fiber, the second multilayer being adapted to change its optical properties dependent on the hydrogen partial pressure in the fluid and dependent on a temperature of the fluid, with a known second characteristic which is different from the first characteristic; at least one light source adapted for coupling light into the first optical fiber and the second optical fiber, at least one light detector adapted for detecting light reflected by the first and second multilayer, a control unit adapted for calculating the hydrogen partial pressure in the fluid by using the first characteristic and the second characteristic and an output signal of the at least one light detector.