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.

Systems and methods presented herein generally relate to a formation testing tool configured to determine whether a formation fluid being tested is a bubble point fluid or a dew point fluid. For example, in certain embodiments, a method includes depressurizing a flowline of a formation testing tool. The flowline contains a formation fluid having a gas-to-oil ratio (GOR) within a predetermined GOR range. The method also includes determining, using a fluid analysis module of the formation testing tool, whether the formation fluid is a bubble point fluid or a dew point fluid by analyzing distribution of bubbles in the formation fluid that are caused by the depressurization of the flowline.

There are provided an optical probe and method for analysing a soil located in an underground area. The optical probe includes a probe head insertable into the underground area to contact the soil, the probe head including a waveguide having opposite first and second ends both optically shielded from the soil; a light source configured to generate a multiwavelength interrogating beam and optically coupled to the first end of the waveguide so that the multiwavelength interrogation beam is inputted in the waveguide to propagate towards the second end; and a detector optically coupled to the second end of the waveguide to detect said multiwavelength interrogation beam. The waveguide includes an unshielded interaction zone extending between the first and second ends providing a wavelength-dependent attenuation of the multiwavelength interrogation beam through interaction with the soil.

Provided are apparatus and system for pest detection and a method for detecting pest damage to prevent pest damage in wooden building structures. The apparatus according to one aspect of the present invention comprises: a post-shaped main body extending in a set direction and formed therealong, and comprising a plurality of holes distanced from each other with a wall therebetween, the wall comprising timber which can be despoiled by pest; and a sensor unit allowing attachment and detachment to and from the upper end of the main body. Here, the sensor unit may comprise: a light-emitting unit comprising at least one light-emitting body for irradiating the interior of at least one hole among the plurality of holes; a sensing unit for sensing the light, emitted from the light-emitting unit, in the interior of at least one hole from among the plurality of holes; and a detection unit for outputting a light signal received from the sensing unit as an electrical signal.

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 spectrometer probe is disclosed herein including a shaft having a first end and a second end, a fiberoptic bundle located within the shaft, the fiberoptic bundle having a first end and a second end, a mirror, a transparent window, a prism, a prism support, an elastically deformable material, an index-matching elastomer, wherein the prism is completely encompassed by the index-matching elastomer, and a penetration cone operatively attached to the second end of the fiberoptic bundle, the mirror located within the second end of the shaft, wherein the transparent window is substantially parallel with the fiberoptic bundle and the shaft, wherein the prism is angled at approximately a 45 degree angle in relation to the window and the fiberoptic bundle, wherein the prism is flush with the prism support, wherein the elastically deformable material is biasly connected to the prism support.

An apparatus comprising: a direct push probe configured to be pushed into a subsurface soil environment; a transparent window mounted to a side of the probe; a white light source mounted within the probe and positioned such that when the white light source is activated only white light exits the window; an ultraviolet (UV) light source mounted within the probe and positioned such that when the UV light source is activated only UV light having a given wavelength exits the window; and an imaging system disposed within the probe and configured to capture a white-light-only-illuminated image and a UV-light-induced-fluorescence image of the subsurface soil environment at a given depth, wherein the imaging system comprises a longpass filter to filter out the UV light having the given wavelength.

Systems and methods presented herein generally relate to a formation testing tool configured to determine whether a formation fluid being tested is a bubble point fluid or a dew point fluid. For example, in certain embodiments, a method includes depressurizing a flowline of a formation testing tool. The flowline contains a formation fluid having a gas-to-oil ratio (GOR) within a predetermined GOR range. The method also includes determining, using a fluid analysis module of the formation testing tool, whether the formation fluid is a bubble point fluid or a dew point fluid by analyzing distribution of bubbles in the formation fluid that are caused by the depressurization of the flowline.

Fluid is sampled from a subterranean formation with a downhole tool from inside a wellbore intersecting the formation. The fluid is analyzed by a spectrometer inside the downhole tool. A light source in the spectrometer is pressure tuned to compensate for a change in wavelength of the output light due to a temperature change in the wellbore, and overlap with a compound of interest or analyte absorption band. The light source is in a fluid filled chamber, and a piezoelectric stack is in a cylinder that has an open end connected to the chamber. The fluid and the light source are selectively pressurized by expanding the piezoelectric stack at frequencies ranging up to at least around 1000 hertz. When pressurized, the output light wavelength is shifted to a range that coincides with a spectral response of a particular compound or compounds. The piezoelectric stack expands in response to electricity.

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.