Abstract: The spectroscopic measuring instrument includes: a spectrometer to make measurement of a reflection spectrum of an object relative to a light source and output measurement information representing a result of the measurement; a shadow projector including obstacle(s) to allow light from the light source to cast shadow(s) on an object surface; an imaging device to output image information representing an image of an imaging area including the object surface; a storage interface removably connectable to a computer readable medium; and a processing device. The processing device is connected to the spectrometer, the imaging device and the storage interface, and performs a measurement process of storing the measurement information from the spectrometer and the image information from the imaging device in the computer readable medium connected to the storage interface.

Abstract: An apparatus internal unit disposed inside a casing includes a fixed unit coupled to an opening portion forming member, a movable unit that is a unit including an incident light processing portion and is configured to be displaced with respect to the fixed unit in a first direction along an optical axis, and at least one elastic member that holds a position of the movable unit in the first direction with respect to the fixed unit by elasticity.

Abstract: An optical device is provided. The optical device includes: a light source; a pinhole plate arranged on a path of input light between the light source and an objective lens; an image sensor configured to detect a reflected light generated by the input light being reflected by a sample; and a noise filter arranged on the path of the reflected light between the image sensor and the objective lens, and the noise filter may remove a part of the reflected light generated by underlying layers below a measurement target layer of the sample.

Abstract: The present invention relates to a gas measuring system for measuring the presence of a predetermined gas including a light source and a light receiver separated by a gas volume, the light source emitting light within a chosen range of wavelengths including characteristic absorption wavelengths of the gas to be measured and the light receiver being capable of detecting light in said wavelength range and the system including a spectrum analyzer and a storage means for storing the specific absorption wavelengths of the gas thus to recognize a gas absorbing at said specific wavelengths. The storage means also includes specific absorption wavelengths characterizing at least one other material having absorption wavelengths partially overlapping the absorption wavelengths of said gas, and thus detect the material in the volume.

Abstract: Optical data is collected from an optical sensor of a dual wavelength, and in order to detect the fire from the collected optical data, an average value of a first wavelength, an average value of a second wavelength, and a ratio of the average values of the two wavelengths are calculated, and an amount of change of a slope of the ratio is used to detect the fire and determine the fire occurrence time. From the determined fire occurrence time, fire features are extracted from the optical data in real time according to defined rules to configure a data set. The data set may be used for learning and inference techniques to identify a fire or non-fire, a fire source, a combustion material, and the like.

Abstract: Disclosed is a visual imaging device based on PS-OCT for early demineralization and caries of dental hard tissues, comprising a laser light source for emitting a laser light, a coupler for receiving and dividing the laser light emitted by the laser light source into a reference laser light and a detection laser light; wherein the reference laser light backtracking to the coupler and the detection laser light backtracking to the coupler are coupled and then passed through a transmission grating and a convex lens to input as an optical signal into a linear CCD detector for converting the optical signal into an electrical signal which is then input to a computer control system and collected by a built-in capture card; and the computer is configured to perform a three-dimensional reconstruction of an image and perform two-dimensional cross-section image analysis; and the computer control system is connected to the scanning galvanometer to control a vibration of the scanning galvanometer.

Abstract: A two-layer hybrid solid wedged etalon was fabricated and combined with a traditional imager to make a compact computational spectrometer. The hybrid wedge was made of Nb2O5 and Infrasil 302 and was designed to operate from 0.4-2.4 ?m. Initial demonstrations used a CMOS imager and operated from 0.4-0.9 ?m with spectral resolutions <30 cm?1 from single snapshots. The computational spectrometer operates similarly to a spatial Fourier Transform infrared (FTIR) spectrometer with spectral reconstruction using a non-negative least squares fitting algorithm based on analytically computed wavelength response vectors determined from extracted physical thicknesses across the entire two-dimensional wedge. This computational technique resulted in performance and spectral resolutions exceeding those that could be achieved from Fourier techniques. With an additional imaging lenses and translational scanning, the system can be converted into a hyperspectral imager.

Abstract: Disclosed is a high-stability nano-radian-order angle measuring method and device based on drift value feedback, belonging to the technical field of precision measurement and the field of optical engineering. The device consists of LED light sources, convex lenses, multi-slit diaphragms, beam splitters, deflecting mirrors, steering mirrors, a collimator objective set, linear array CCDs, a four-quadrant position detector and a plane mirror. The method includes: enabling two paths of measuring light beams to carry angle change information of a measured object, respectively forming respective images on two sensors, and calculating a pitch angle and a yaw angle of the measured object relative to an optical axis by using positions of the two images so as to achieve the detection capability on the angle change of the measured object. While a focal distance of the objective is greatly improved by using the collimator objective set, the linear array CCDs are used as sensors to improve a measuring range.

Abstract: The concentration measurement device 100 includes an electric unit 20 having a light source 22 and a photodetector 24, a fluid unit 10 having a measurement cell 1, optical fibers 11 and 12 for connecting the electric unit 20 and the fluid unit 10 and is configured to measure the concentration of the fluid in the measurement cell by detecting the light incident from the light source 22 to the measurement cell and then emitted from the measurement cell by the photodetector 24, where optical connection parts 32 and 34 connected to the optical fibers 11, 12 and the light source 22 or the photodetector 24 are integrally provided in the electric unit 20.

Abstract: Provided are an optical spectrum analyzer and a pulse-modulated light measurement method capable of measuring pulse-modulated light even when a pulse-on time and a pulse period of the pulse-modulated light are unknown. Pulse-modulated light (DUT) is incident on a diffraction grating 3. A first light receiving unit 8 receives the 0th-order light of diffracted light diffracted by the diffraction grating 3. A second light receiving unit 7 receives diffracted light of an order other than the 0th-order light. A measurement timing signal generation unit 9 generates a sampling signal based on the 0th-order light received by the first light receiving unit. The spectrum of the diffracted light received by the second light receiving unit is measured based on the sampling signal generated by the measurement timing signal generation unit.

Abstract: A system for testing a spectral response speed of a tunable filter is disclosed, which includes a collimating light source, a beam splitting element, a focusing lens, and an image recording device of light spot position arranged successively. The tunable filter is disposed between the collimating light source and the beam splitting element and configured to be continuously tuned within a certain wavelength range during testing. The beam splitting element is used to form light beams of different wavelength bands passing through the tunable filter into diffracted beams or refracted beams corresponding to different wavelength bands. The focusing lens is used to perform focusing. The image recording device of light spot position is used to record change information about positions where the diffracted beams or refracted beams corresponding to different wavelength bands are imaged.

Abstract: A shape of an object is measured with a high degree of accuracy. A shape measurement system comprises: a distance measuring head for irradiating an object with light and receiving light reflected from the object; a distance measuring device for generating a distance detection waveform on the basis of the reflected light; and a control device for analyzing the distance detection waveform and calculating a measured distance value to the object. The shape measurement system is characterized in that the control device calculates a feature amount of the distance detection waveform and performs at least one of a process of correcting an error in the measured distance value by substituting the feature amount into a correction formula and a process of performing a confidence weighting of an error in the measured distance value by substituting the feature amount into a confidence weighting formula.

Abstract: Methods and apparatus, including computer program products, for determining a presence of an object located close to a lens (301) of a camera monitoring a scene. A first infrared illumination source (302) arranged to illuminate the scene from a first angle is activated. A first image (304) is acquired by the image capturing device (300). The first infrared illumination source (302) is deactivated, and a second infrared illumination source (306) arranged to illuminate the scene from a second angle is activated. A second image (308) is acquired by the image capturing device (300). Intensity information of the first image (304) and the second image (308) is compared to determine the presence of an object located close to the lens (301).

Abstract: A lamination molding apparatus includes a molding room, a chamber, a chamber window, a molding table, a molding table driving device, surrounding walls, an irradiation device, a measuring unit, and a controller. The measuring unit includes a first measuring device acquiring a measured value of a light intensity, and a second measuring device acquiring a value of a beam diameter, and measures laser beams outputted based on set values of light intensity during molding. The controller determines an abnormality has occurred when a slope of a linear function obtained from a relationship between the measured value of the light intensity and the value of the beam diameter at a predetermined height is out of a predetermined range, or when a slope of a linear function obtained from a relationship between the measured value of the light intensity and a value of a focal position is out of a predetermined range.