Abstract: Apparatus and methods are presented for spectral domain optical imaging, in particular for single shot 3-D spectral domain imaging of the retina or angio-OCT applications, using an extended illumination field comprising a plurality of linearly displaced combs of wavelengths selected from across the light source bandwidth. This allows recovery of phase and amplitude information at many times the Nyquist depth, without the loss of optical power that would be incurred by traditional wavelength comb generators such as etalons. Spatially incoherent or partially spatially incoherent light sources can be used in certain embodiments. In certain embodiments a temporally modulated angular component is imposed on a short axis of the extended illumination field. In preferred embodiments light reflected or scattered from the object is sparsely sampled in the far field, e.g. at a Fourier plane, in a dimension perpendicular to the long axis of the extended illumination field.

Abstract: Provided is a complex sensing device including a thickness sensing device including pulse generating device configured to generate a probe pulse and a pump pulse, a first optical splitter configured to split the probe pulse and direct the pump pulse to a surface of a sample and generate an acoustic signal in the sample, a detector configured to receive a reflection probe pulse generated by the probe pulse being reflected from the sample, a first processor configured to receive and process a first signal from the detector, and a second optical splitter on a path of the reflection probe pulse from the sample to the detector, the second optical splitter being configured to split the reflection probe pulse, and a surface shape sensing device configured to receive a split probe pulse split from the first optical splitter and a split reflection probe pulse split from the second optical splitter, and measure a surface shape of the sample based on a phase difference between the split probe pulse and the split reflect

Abstract: A measurement device includes a splitter splitting light from a light source into first and second lights; an optical frequency shifter shifting a frequency of the first light; a first optical modulator modulating intensity of the first light and generating probe light having two frequency components; a second optical modulator generating pump light by pulsing the second light; an optical detector detecting, when the probe light is incident from a first end of an optical fiber to be measured and the pump light is incident from a second side of the optical fiber, light emitted from the second side of the optical fiber; and a processor measuring, based on detected light intensity, temperature or distortion of the optical fiber, in which a frequency of a lower one of the two frequency components yields Brillouin gain, and a frequency of a higher frequency component yields Brillouin loss.

Abstract: Provided is a distance measuring device and a distance measuring method capable of achieving LiDAR with high accuracy at low cost. In a plurality of division times obtained by dividing a modulation cycle for chirp-modulating frequencies of transmission beams of a plurality of channels, light emission and extinction of a plurality of light sources are controlled in a unique pattern for each light source, an interference beam between a reception beam and a transmission beam is detected, digitized into a reception signal sequence, and subjected to FFT to obtain a frequency spectrum, a beat frequency is specified from comparison of magnitude of peaks, and a distance to a measurement target and a relative speed are measured. The present disclosure can be applied to LiDAR.

Abstract: A monitoring system connected to a network may receive a request from a user device over the network to monitor a fiber cable. A fiber sensing device may connect to the monitoring system, may communicate messages with the monitoring system, and may connect to the fiber cable. The fiber sensing device may receive an instruction from the monitoring system to begin a monitoring function for the fiber cable, and may provide a first optical signal to the fiber cable. The fiber sensing device may receive, from the fiber cable, a second optical signal, based on the first optical signal, and may detect a risk to the fiber cable based on the second optical signal. The fiber sensing device may send an alert about the risk to the fiber cable to the monitoring system, and the monitoring system may send the alert over the network to the user device.

Abstract: The provided is a torsion compensation system and a compensation method for a FBG curvature sensor. The compensation system includes a FBG curvature sensor, installed on a scraper conveyor; angle sensors, including two and installed on both sides of the FBG curvature sensor, are configured to obtain the torsion angle of the FBG curvature sensor by monitoring the difference between the two ends of the FBG curvature sensor; a FBG string, arranged on the FBG curvature sensor to form a plurality of grating measuring points, is configured to perceive the center wavelength of the FBG curvature sensor; a FBG demodulator, coupled with the FBG string, is configured to convert the optical signal of the center wavelength perceived by the FBG string into an electrical signal; a computer, respectively coupled with the angle sensors and the FBG demodulator, is configured to eliminate the FBG wavelength variation caused by torsion.

Abstract: Devices, systems, and methods for controlling insects in a smoke detector device are described herein. One insect controlling smoke detector device, includes a housing having a smoke detecting chamber formed therein, a light source directing a light beam through the smoke detecting chamber, a light sensor to receive a portion of the light beam and analyze the received light beam to determine whether smoke particles are present in the chamber, and an insecticide injecting apparatus to inject insecticide into the chamber.

Abstract: An apparatus (100) for identifying precious stones and man-made stones is disclosed. The apparatus (100) includes a handheld device (2) with a probe (4), a thermal and optical testing assembly, a microcontroller (36), and a visual indicator (6). The probe is electronically coupled with the handheld device (2) and is removable and replaceable. The probe (4) includes a copper tube (5a) with an optical fiber (23) and a tip (5) for contacting the stone under test. The thermal testing assembly heats the copper tube (5a) and the optical assembly illuminates the stone (12, 13) under test with UV light. The microcontroller (36) determines heat transfer and determines at least one of: the electrical, thermal, and optical properties of the stone. The microcontroller (36) identifies the type of stone, and the visual indicator displays the result.

Abstract: The present invention provides a quantitative liquid biopsy diagnostic system and methods for performing diagnostic assays. The system offers a liquid biopsy method using circulating tumor cells (CTCs) or White Blood Cells (WBC) subpopulations for precision cancer diagnosis, early detection of disease evolution, and cancer patient management. The invention utilizes selective plane illumination microscopy (SPIM) to deliver high sensitivity and specificity for the detection and isolation of individual CTCs, superseding the efficacy of existing methodologies for early cancer detection. Isolated CTCs can be analyzed for their molecular fingerprint, which can lead to matching genetic abnormalities with specific drug treatments. The system allows ex vivo observation of live CTC or WBC response to treatment.

Abstract: Methods and systems for automatically adjusting a sample position in a spectrometer, such as a Fourier-transform infrared (FTIR) spectrometer, are described. The sample may be automatically positioned using an auto-focusing procedure. For example, images including an aperture marker are acquired by directing light towards the sample via an aperture. The sample position may be adjusted based on features extracted from the aperture marker images.

Abstract: A device for determining the three-dimensional geometry of an individual object includes a supplier, a line projection, an image capturing system, and a processing unit connected to the first image capturing system for receiving the first signal. The processing unit is configured to determine, for each image from the image capturing system, a two-dimensional representation of a slice of the object, and determine, using the representation of each slice, a three-dimensional representation of the object. A method of determining a three-dimensional representation of an individual object includes the aforementioned steps performed by the processing unit.

Abstract: An apparatus receives a radio frequency (“RF”) signal. The apparatus includes a first modulator encoding the RF signal on an optical carrier. The optical carrier includes a plurality of sidebands. The apparatus includes a filter operably coupled to the first modulator and passing therethrough an isolated sideband of the plurality of sidebands. The apparatus includes a Rayleigh-backscattering (“RBS”) speckle spectrometer. The RBS speckle spectrometer includes a second modulator receiving the isolated sideband and modulating the isolated sideband into alternating short and long, interrogation pulses. The RF speckle spectrometer generates a first collected signal based on Raleigh backscattered light in a first polarization and a second collected signal based on Raleigh backscattered light in a second polarization. The apparatus includes a processor receiving the first collected signal and the second collected signal, and recovering therefrom the RF spectrum of the RF signal.

Abstract: A data processing device performs an abnormality determination process in which i) a relative moving distance indicating a distance by which a tracking target moves relatively to a movable body is predicted, in a range of a data set for expressing point group data until the lapse of a predetermined time from a present timing, ii) the relative moving distance includes a vertical distance and a horizontal distance, iii) an estimated intensity of reflected light is calculated, when the vertical distance or the horizontal distance is equal to or longer than a predetermined distance, and iv) it is determined that there is an abnormality in the predetermined section when it is determined that a difference between the estimated intensity of the reflected light and an actual intensity of the reflected light is higher than a predetermined intensity.

Abstract: Detecting vibration of a cable including providing a clock signal along a cable, the clock signal is modulated along the cable by a vibration frequency to generate a modulated signal along the cable that includes upper and lower sideband frequencies with respect a frequency of the clock signal; providing the modulated signal to a multiplexer, a positive polarity signal of the modulated signal is provided to a first input line of the multiplexer and a negative polarity signal of the modulated signal is provided to a second input line of the multiplexer; selecting one of the positive polarity signal and the negative polarity signal based on a state of a reference signal; demodulating, based on the selecting, the modulated signal to generate a demodulated signal, including generating the vibration frequency at a baseband of the demodulated signal; filtering the demodulated signal to obtain filtered signal including only the vibration frequency.

Abstract: A wavelength reference device includes a broadband optical source, a repeating filter, and a wavelength-specific filter. The source, which can be a super-luminescent light-emitting diode (SLED), emits optical power. The repeating filter, which can be a Fabray-Perot etalon, filters the optical power into a repeating spectral response, and the wavelength-specific filter attenuates the optical power of at least one predefined wavelength response within the wavelength band. The repeating filter and the wavelength-specific filter output a wavelength reference signal having the repeating spectral response attenuated at the at least one predefined wavelength response. The predefined wavelength response reduces the ambiguity that can occur in the repeating frequency locations found in the repeating spectral response. In this way, an absolute wavelength reference is intrinsically provided in the wavelength reference that removes the location ambiguity caused by the repeating spectral response.

Abstract: Aspects of systems and apparatuses for medical infusion illumination are disclosed. In one aspect a system for medical infusion line illumination is disclosed. The system comprising an electronic illuminator. The electronic illuminator comprising a printed circuit board (‘PCB’), a light emitting diode (‘LED’), a lens configured with the LED, a power source to supply power to the PCB and LED; and at least one sensory assembly. The LED and lens of the electronic illuminator are configured to a side scattering fiber optic cable. The side scattering fiber optic cable comprises a fiber funnel cap at a proximal end to receive light from the LED through the lens of the electronic illuminator. The side scattering fiber optic cable further comprises a protective end cap at a distal end, wherein the protective end cap is polished on an interior surface to reflect light from the LED of the electronic illuminator.

Abstract: Hand-held, rechargeable multi-tester with 2 in 1 thermal and optical LED probe tip, for identifying Earth-mined diamond, Type IIa HPHT diamonds, Type IIa CVD diamond, Simulant and Moissanite (including F1). All-in-one testing probe having both thermal conductivity sensor and optical sensor. Testing probe uses copper tube with built-in optical fiber for the tip of the probe and bundled optical fibers forming an optical ring to illuminate a target stone with light source using internal UV LEDs. Short and long wave UV light can be used singularly or together. Sensors measure thermal conductivity and optical absorptivity by converting an amount of temperature change and incident light into an output and sending signals to microcontroller unit to give results using color LCD touch screen to display and with speaking results in multiple languages. In addition to thermal and short and long wave optical, testing for metal may be added to handheld tester.

Abstract: Aspects of the present disclosure include methods for determining photodetector gain for a plurality of photodetectors in a light detection system. Methods according to certain embodiments include applying a reference voltage to each photodetector in the light detection system, generating a reference data signal for each photodetector at the reference voltage, irradiating with a light source the photodetectors at a plurality of different applied voltages, generating output data signals for each photodetector at each of the plurality of different voltages and calculating gain of the photodetectors at each of the plurality of different applied voltages based on the output data signals for each photodetector at each applied voltage and the reference data signal. Systems (e.g., particle analyzers) having a light source and a light detection system that includes a plurality of photodetectors for practicing the subject methods are also described. Non-transitory computer readable storage medium are also provided.

Abstract: An analysis device includes: at least one magnetic element having a first ferromagnetic layer, a second ferromagnetic layer, and a spacer layer sandwiched between the first ferromagnetic layer and the second ferromagnetic layer; and a light source configured to emit a light, wherein the light is applied to an object to be analyzed, and the at least one magnetic element is configured to detect a reflected light reflected by the object or a transmitted light transmitted through the object.

Abstract: An observation apparatus includes a light source unit, an irradiation optical system, an imaging optical system, a modulation unit, an imaging unit, an analysis unit, beam splitters and, and mirrors. The analysis unit obtains a real part of a function ?(t)=log[1+Uobj(t)/Uref(t)], defined by time series data Uobj(t) of a complex amplitude image of object light on an imaging plane and time series data Uref(t) of a complex amplitude image of reference light on the imaging plane, based on time series data I(t) of an intensity image of interference light on the imaging plane and time series data Iref(t) of an intensity image of the reference light on the imaging plane. Further, the analysis unit obtains an imaginary part of ?(t) from the real part of ?(t) using the Kramers-Kronig relations, and further obtains Uobj(t).