Abstract: An imaging chamber configured to receive a flow of a fluid sample is provided. The imaging chamber includes a reservoir and an imaging window. The reservoir includes a contrast-enhancing agent and is configured to receive the flow of the fluid sample. The imaging window of the imaging chamber is downstream from the reservoir.

Abstract: The present disclosure provides a photonic gas sensor chip comprising a substrate, a silicon oxide layer disposed on the substrate, a heating element disposed on the silicon oxide layer, a silicon oxide base disposed on the heating element, and a silicon nitride waveguide disposed on the silicon oxide base. The silicon nitride waveguide comprises an extended resonant ring waveguide comprising spiral waveguide sections. The spiral sections increase optical path length while maintaining compact footprint. The heating element enables thermal tuning of resonant frequency to match dual frequency comb spectroscopy repetition frequencies.

Abstract: A spectroscopic liquid flow device coupled to a liquid flow path, wherein the spectroscopic liquid flow device comprises a measurement cell configured to receive at least a portion of the liquid flow path; a laser emitter configured to (i) provide a dual frequency comb source, (ii) generate a spectrum of optical frequencies, and (iii) emit the spectrum of optical frequencies through the portion of the liquid flow path in the measurement cell; and a photodetector configured to (i) receive the spectrum of optical frequencies passed through the portion of the liquid flow path and (ii) generate an output signal based on the spectrum of optical frequencies passed through the portion of the liquid flow path; and a computing system configured to determine one or more substance concentrations in the liquid flow path based on the output signal.

Abstract: The present disclosure provides a system for in situ spectroscopic analysis of medicinal fluid. The system comprises a fluid sampling chamber in fluid communication with a medicinal fluid delivery container to receive a sample. A dual frequency comb (DFC) positioned on a first side of the fluid sampling chamber emits light through the sample. A photodetector positioned on a second, opposite side receives the emitted light from the DFC that has been exposed tod elements within the sample. At least one processing element generates an optical absorption spectrum from the received light and identifies elements within the fluid sampling chamber exposed to the emitted light.

Abstract: The present disclosure provides a spectroscopic gas cell comprising a cylindrical body defining a chamber for receiving gas to be analyzed, an inlet for adding gas to the chamber, an outlet for removing gas from the chamber, an optical fiber input port closing a first end of the cylindrical body and adapted to connect to a first optical fiber ferrule to input laser light into the chamber, an optical fiber output port closing a second end of the cylindrical body and adapted to connect to a second optical fiber ferrule, a first off-axis ellipsoidal reflector positioned within the input port to reflect laser light from the first ferrule into the chamber, and a second off-axis ellipsoidal reflector positioned within the output port to reflect laser light from the chamber toward the second ferrule.

Abstract: A system comprising a reactor tank configured to receive a liquid composition via a liquid flow path; a plurality of dual frequency comb spectroscopy (DFCS) configurations, wherein a DFCS configuration of the plurality of DFCS configurations comprises a laser emitter configured to emit laser light through at least a portion of the liquid flow path; and a photodetector configured to (i) receive transmitted light from the laser light passed through the portion of the liquid flow path and (ii) generate a signal output based on one or more absorption or wavelength characteristics of the transmitted light; and a system monitor communicatively coupled to the plurality of DFCS configurations, wherein the system monitor is configured to determine one or more substance concentrations at the portion of the liquid flow path based on the signal output.

Abstract: The present disclosure provides a device for in situ spectroscopic analysis of medicinal fluid. The device comprises a positioning structure, a dual frequency comb (DFC) on a first side, a photodetector on the opposite side facing the DFC, and a processing element. The positioning structure positions the DFC and photodetector at desired separation distance on opposite sides of a medicinal fluid delivery container. The DFC emits light passing through the container and medicinal fluid. The photodetector receives the emitted light from the DFC that has been exposed to elements within the medicinal fluid exposed to the emitted light. The processing element generates an optical absorption spectrum from the received light and identifies elements within the medicinal fluid.

Abstract: The present disclosure provides a spectroscopic gas cell comprising a cylindrical body defining a chamber for receiving gas to be analyzed, an inlet and outlet for gas addition and removal, a first mirror adjacent to a first end of the cylindrical body, a second mirror adjacent to a second end, and piezoelectric actuators positioned to provide axial and off-axial position adjustment of the mirrors. The piezoelectric actuators enable real-time alignment correction during gas sensing operations and may be positioned to adjust both mirrors. The actuators are positioned within flexible circular holders and comprise piezoelectric stacks that adjust mirror orientation and axial position to maintain resonant cavity alignment for enhanced gas detection sensitivity.

Abstract: Various embodiments described herein relate to determining flow occlusion in microfluidics using digital holography. In this regard, various embodiments provide for receiving two or more images of a plurality of blood cells transiting one or more microfluidic channels of an occlusion device, determining a presence indication for blood cells within the one or more microfluidic channels based on at least one image of the two or more images, determining a movement indication for the blood cells within the one or more microfluidic channels based on the two or more images, and generating an occlusion status for the one or more microfluidic channels based on the presence indication and the movement indication.

Abstract: Apparatuses and methods for analyzing fluid samples are provided. For example, an example apparatus may include a fluid imaging chamber, at least one illumination source component, and an image sensor component. In some examples, the fluid imaging chamber comprises a flow channel for receiving a fluid sample. In some examples, the at least one illumination source component is configured to emit at least one light beam, and the at least one light beam is directed through the fluid sample in the flow channel from a top surface of the fluid imaging chamber. In some embodiments, the image sensor component is positioned under a bottom surface of the fluid imaging chamber and configured to generate digital holography image data of the fluid sample.

Abstract: An example apparatus, method, and system for determining a characteristic of a target gas in a fluid sample is provided. In some embodiments, the example apparatus includes a frequency comb illumination source configured to emit pulsed light having a plurality of frequency comb wavelengths. The apparatus also includes an optical cavity containing a fluid sample and exhibiting a plurality of cavity resonance modes. A frequency comb wavelength of the plurality of frequency comb wavelengths associated with the frequency comb illumination source is configured to align with a cavity resonance mode of the plurality of cavity resonance modes. A characteristic of the fluid sample is determined based on one or more optical characteristics of a transmitted light passing through the fluid sample within the optical cavity.

Abstract: Methods, apparatuses, and computer program products for controlling access by an electric vehicle (EV) to a controlled-access area are provided. For example, a computer-implemented method may include receiving data from an EV related to a fire risk in a battery of the EV and determining, using the data received from the EV, whether to allow the EV to enter a controlled-access area.

Abstract: A high current switch comprising one or more of a gas composition sensor or a gas ionization sensor configured to (i) determine a condition associated with the current switch and (ii) generate respective one or more of a gas data signal or a ionization data signal; and a plurality of switch contacts configured to (i) receive a control signal from a system controller and (ii) switch a current input to a current output based on the control signal, wherein the control signal is generated by the system controller based at least in part on one or more of the gas data signal or the ionization data signal.

Abstract: A fluid sampling device, the device having a fluid composition sensor configured to receive a fluid sample and capture a plurality of particles from the fluid sample at a collection media, wherein the fluid composition sensor is further configured to generate particle data associated with the plurality of particles using a particle imaging operation, and a controller, the controller being configured to: determine an optimal sample volume associated with a sample collection operation based at least in part on a particle load condition defined by the plurality of particles captured at the collection media during the sample collection operation, and update one or more operational characteristics of the fluid composition sensor such that the sample collection operation is defined at least in part by the optimal sample volume.

Abstract: Embodiments of the present disclosure provide for improved generation and outputting of object identification data indicating object classifications for object representations. Such objects representations may correspond to depictions of objects in images captured using digital holographic microscopy. Some embodiments generate object identification data by comparing object representations in focused image(s) with specially configured annotated focused images, for example using a specially trained neural network or other machine learning model trained based on such annotated focused images. The annotated focused images are generated including a plurality of channels, each associated with a different grayscale focused image at a different target focal length of a range of target focal lengths. In this regard, model(s), algorithm(s), and/or other specially configured implementations may learn the spatial features of particular object representations and associated object identification data.

Abstract: A flow device, method, and system are provided for determining the fluid particle composition. An example flow device includes a fluid sensor configured to monitor at least one particle characteristic of fluid flowing through the fluid sensor. The example flow device also includes at least one processor configured to, upon determining the at least one particle characteristic satisfies a particle criteria, generate a control signal for an external device. The example flow device also includes a fluid composition sensor configured to be powered based on the control signal and further configured to capture data relating to the fluid particle composition. The example flow device is also configured to generate one or more particle profiles of at least one component of the fluid based on the data captured by the fluid composition sensor.

Abstract: Various embodiments are directed to a device for detecting fluid particle characteristics comprising: a collection fluid dispense assembly configured to selectively dispense a volume of collection fluid onto an absorbent media disposed within an internal sensor portion of a fluid composition sensor, producing a collection media based on interaction between the volume of collection fluid and the absorbent media; and a controller configured to determine, based on a particle image captured by an imaging device, a particle characteristic associated with a particle captured at the collection media.

Abstract: A laser illumination device is provided. For example, a laser illumination device comprises a laser diode having an anode and a cathode, a photodiode having an anode and a cathode connected to the cathode of the laser diode, a laser diode driver having a voltage output connected to the anode of the laser diode and a feedback input connected to the anode of the photodiode, and a variable resistor with a selectable resistance value connected between the anode of the photodiode and ground. The selectable resistance value is selected to maintain a reference voltage on the anode of the photodiode to reverse bias the photodiode.

Abstract: A flow device, method, and system are provided for determining the fluid particle composition. An example flow device includes a fluid sensor configured to monitor at least one particle characteristic of fluid flowing through the fluid sensor. The example flow device also includes at least one processor configured to, upon determining the at least one particle characteristic satisfies a particle criteria, generate a control signal for an external device. The example flow device also includes a fluid composition sensor configured to be powered based on the control signal and further configured to capture data relating to the fluid particle composition. The example flow device is also configured to generate one or more particle profiles of at least one component of the fluid based on the data captured by the fluid composition sensor.

Abstract: An example apparatus, method, and system for determining a characteristic of a target gas in a fluid sample is provided. In some embodiments, the example apparatus includes a frequency comb illumination source configured to emit pulsed light having a plurality of frequency comb wavelengths. The apparatus also includes an optical cavity containing a fluid sample and exhibiting a plurality of cavity resonance modes. A frequency comb wavelength of the plurality of frequency comb wavelengths associated with the frequency comb illumination source is configured to align with a cavity resonance mode of the plurality of cavity resonance modes. A characteristic of the fluid sample is determined based on one or more optical characteristics of a transmitted light passing through the fluid sample within the optical cavity.