275results about "Spectrum generation using multiple reflection" patented technology

The invention discloses a reconstruction spectral imaging system based on an electromagnetic drive Fabry-Perot resonant cavity, and belongs to the field of spectral imaging. The system comprises an optical lens group, an electromagnetic driving device, a Fabry-Perot resonant cavity, a photoelectric detection array and a calculation unit, the cavity length of the Fabry-Perot resonant cavity can be adjusted through the electromagnetic driving device. The optical lens group receives light reflected or emitted by an external to-be-measured target scene and carries out collimation processing, and then the light enters the Fabry-Perot resonant cavity. The Fabry-Perot resonant cavity screens the incident light based on the resonance condition of the cavity length of the Fabry-Perot resonant cavity, and the screened light is emitted to the photoelectric detection array; the photoelectric detection array converts the incident light intensity into an electric signal and outputs the electric signal to the calculation unit; and a spectrum reconstruction model is built in the calculation unit, and a hyperspectral image of the to-be-measured target scene is obtained by using the spectrum reconstruction model based on the electric signal. The working range and the spectral imaging precision of the spectral imaging system based on the Fabry-Perot resonator are improved, the technological requirements are reduced, and the engineering applicability of the spectral imaging system based on the Fabry-Perot resonator is improved.

A composite optical filter may include a substrate, a communal optical filter, one or more first optical filters, and one or more second optical filters. The communal optical filter may be formed on a first surface of the substrate. The one or more first optical filters may be formed on one or more first portions of a second surface of the substrate and may be configured to pass light associated with a first wavelength. The one or more second optical filters may be formed on one or more second portions of the second surface of the substrate and may be configured to pass light associated with a second wavelength.

To increase variable speeds in a wavelength variable bass-pass filter of SBS type.SOLUTION: Provided is a wavelength variable band-pass filter using Simulated Brillouin Scattering (SBS), comprising: a light source for outputting SBS pump light based on a set wavelength; an SBS medium which the SBS pump light and the signal light to be filtered are inputted to, and which outputs part of SBS-amplified signal light; and a path control unit located between the light source and the SBS medium, for forwarding input from the SBS medium to an output terminal while outputting input from the light source to the SBS medium. The light source is a Dispersion-Tuned Mode-Locked Laser (DTMLL).SELECTED DRAWING: Figure 6

To provide a spectroscopic unit and spectroscopic module that can perform measurements with high precision. [Solution] The spectroscopic unit 110 includes a Fabry-Perot interference filter 10 having a pair of mirrors whose distance from each other is variable, an optical system 50 having a first lens 51 that focuses light from an object M onto the Fabry-Perot interference filter 10, and a photodetector 8 that detects light transmitted through the Fabry-Perot interference filter 10. When the distance D1 from the first lens 51 to the object M is 5 cm, and a circular area on the surface of the object M with a diameter D2 of 1 cm is defined as the field of view region A, the optical system 50 is configured to allow light with a divergence angle of 1 degree or less to enter the light transmission region of the Fabry-Perot interference filter 10, while preventing light with a divergence angle greater than 1 degree from entering the light transmission region of the Fabry-Perot interference filter 10 from entering the light transmission region.

A light detection device includes: a Fabry-Perot interference filter provided with a light transmission region; a light detector configured to detect light transmitted through the light transmission region; a package having an opening and accommodating the Fabry-Perot interference filter and the light detector; and a light transmitting unit arranged on an inner surface of the package so as to close an opening, the light transmitting unit including a band pass filter configured to transmit light incident on the light transmission region. When viewed from a direction parallel to the line, an outer edge of the Fabry-Perot interference filter is positioned outside an outer edge of the opening, and an outer edge of the light transmitting unit is positioned outside the outer edge of the Fabry-Perot interference filter.

A method for calibrating the driving parameters of an optical component within its operating wavelength range. The method includes placing a material layer in an optical path, the material layer being substantially planar and substantially transparent, and having a thickness on the order of wavelengths within the range; operating the component to change the driving parameters while detecting light transmitted through the material layer to obtain driving parameter and light intensity data. The obtained data is then compared with previously derived characterization data for the material layer to calibrate the driving parameters.

A method of manufacturing a Fabry-Perot interference filter includes a forming step of forming a first thinned region, a first mirror layer, a sacrificial layer, and a second mirror layer are formed on a first main surface of a wafer, and the first thinned region in which at least one of the first mirror layer, the sacrificial layer, and the second mirror layer is partially thinned along each of a plurality of lines is formed; a cutting step of cutting the wafer into a plurality of substrates along each of the plurality of lines by forming a modified region within the wafer along each of the plurality of lines through irradiation of a laser light, after the forming step; and a removing step of removing a portion from the sacrificial layer through etching, between the forming step and the cutting step or after the cutting step.

A medication assurance system for verification of both the medication and the patient is disclosed. A portable spectrometer is used to obtain a light spectrum of the medication. A subject identification or biometric device is used to identify the patient. A controller coupled to the portable spectrometer and the subject identification device identifies the medication by performing a chemometric analysis of the light spectrum. Based on the medication identified and the patient identified, the controller can determine if the medication is to be taken by the patient.

The invention discloses a spectrum super-resolution method and system based on an FP cavity and deep learning, and the method comprises the steps: S1, carrying out the initialization of spectrum collection, and selecting light with a specific wavelength after the light is acted with a target detection object; s2, performing photoelectric conversion and digitization to generate low-resolution original discrete spectrum data of corresponding wavelengths; s3, continuous spectrum scanning is carried out, and original discrete spectrum data collection of the whole target wave band is completed; and S4, performing super-resolution spectrum reconstruction, and judging whether cyclic reconstruction is performed or not based on a reconstruction data quality evaluation result until the quality is qualified. According to the method, an accurate mapping model from a low-resolution spectrum to a high-resolution spectrum is established through a pre-trained deep neural network, and an original spectrum which is collected by an FP cavity and is limited by the theoretical limit optical resolution of the FP cavity can be reconstructed into a super-resolution spectrum of which the resolution remarkably exceeds the theoretical limit. The problem that the resolution of an FP cavity in a long-wave region is sharply reduced is effectively solved, and the full-wave-band uniform high resolution is realized.

Liquid membrane cell assemblies are disclosed. In some embodiments, the liquid membrane cell assembly includes an elongate base having opposed first and second end portions and a central portion disposed therebetween. The first and second end portions each includes an elongate body, an electrolyte channel within the body, an electrolyte port fluidly connected to the electrolyte channel, a fuel channel within the body, and a fuel port fluidly connected to the fuel channel. The central portion includes spaced and opposed first and second members that connect the bases of the first and second portions and that horizontally define an open area therebetween. The liquid membrane cell assembly additionally includes an anode adjacent the first and second members, and a cathode adjacent the first and second members such that the base is disposed between the anode and the cathode. The anode and cathode vertically define the open area therebetween.

To provide a favorable filter array with reduced stray focused light.SOLUTION: An apparatus is disclosed comprising an optical filter array (10) including an array of optical filter elements; where each optical filter element has opposing mutually parallel principal faces connected by sidewalls including at least one pair of opposing trapezoidal sidewalls and at least one pair of opposing sidewalls that are not mutually parallel; and where the opposing mutually parallel principal faces of the filter elements collectively define optical entrance and exit apertures of the optical filter array and include interference filters. Further disclosed is a method of illuminating such a filter array.SELECTED DRAWING: Figure 1

The solid-state optical cavity may include a first mirror and a second mirror that provide reflective surfaces for reflecting light back and forth within the cavity to create a standing wave at a resonant frequency. A thin-film lithium niobate layer may be deposited between the first mirror and the second mirror. The thin-film lithium niobate layer may be configured to be electrically tunable to optically select the resonant frequency.

The invention discloses a broadband FP (Fabry-Perot) cavity transmission spectral line calibration method and a calibration spectral line generation device, and belongs to the field of astronomical spectrum calibration. According to the invention, the laser frequency comb is utilized to carry out precise calibration on the FP cavity, the precision is an Hz magnitude, and the calibration precision of the radial velocity of the FP cavity can reach m / s; by tuning laser frequency comb parameters, all transmission peaks are supplemented, and broadband coverage is achieved; the high precision requirement for FP cavity coating is avoided, the accuracy of transmission spectral lines is ensured, frequent calibration is performed on the FP cavity, and the problem that the FP cavity cannot provide long-term stability of frequency is solved; a low-repetition-frequency picosecond white light source is used, the spectrum is wide and flat, the spectrum is not sensitive to the position of a transmission peak of an FP cavity, and the light enters a calibrated FP cavity array to generate a calibration spectral line with a high signal-to-noise ratio and multiple frequency intervals, so that the calibration precision of the astronomical spectrometer reaches the cm / s-level radial velocity calibration precision. The method is applied to the calibration of the astronomical spectrometer for extrasolar planet search.

To provide a spectroscopic imaging method, a spectroscopic imaging apparatus, and a computer program capable of performing simple spectroscopic imaging.SOLUTION: A spectroscopic imaging method includes the steps of: setting a wavelength for spectroscopic imaging an object; installing the object and a white reference in an imaging region in which the object is imaged; identifying a position of the white reference to set the position of the white reference as a reference area; preliminary imaging the reference area with predetermined exposure time for each of a plurality of wavelengths to acquire an intensity value for each wavelength; calculating exposure time at actual imaging on the basis of a maximum intensity value obtained by preliminary imaging and a target intensity value at the actual imaging; actual imaging the object with the exposure time at the actual imaging; generating a processed image on the basis of an intensity spectrum of all pixels of a captured image of the object with respect to an intensity spectrum of the reference area; and displaying the processed image.SELECTED DRAWING: Figure 2

To reduce an error accompanying the generation of images of a plurality of wavelength bands.SOLUTION: A method includes: acquiring first information indicating a relative position between an encoding element including a plurality of regions having spectral transmittance different from each other and an image sensor that detects light transmitted through the encoding element; and correcting data including second information about the spatial distribution of the spectral transmittance on the basis of the first information. The data is used for processing of generating four or more spectral images on the basis of an image acquired by causing the image sensor to detect the light transmitted through the encoding element. Each of the four or more spectral images indicates an image corresponding to one wavelength band of the four or more wavelength bands.SELECTED DRAWING: Figure 1A

An Offner spectrometer for use in a multi-slit hyperspectral imaging system for imaging a remote object includes a first surface that is a transmissive surface having a narrow slit receiving light from a multi-spectral light source, a second curved transmissive surface receiving light from the first surface, a third curved reflective surface receiving light from the second surface, a fourth reflective surface that is a curved surface with a grating receiving light from the third surface and diffracting and reflecting light, a fifth surface that is curved reflective surface receiving light from the fourth surface, a sixth curved transmissive surface receiving light from the fifth surface, and a seventh surface that is a focal plane of the Offner spectrometer receiving light from the sixth surface. Each curved surface has X and Y prescriptions that are decoupled.

A filter unit includes a substrate having an opening and a Fabry-Perot interference filter having a pair of mirror portions facing each other in a Z-axis direction and spaced apart by a variable distance. The Fabry-Perot interference filter is disposed on the substrate so as to overlap the opening in the Z-axis direction. A first recess portion is formed in the substrate with the Z-axis direction as the depth direction. The Fabry-Perot interference filter is disposed in the first recess portion. Viewed in the Z-axis direction, a distance from an inner edge of the first recess portion to an outer edge of the substrate in a Y-axis direction is greater than a width of the Fabry-Perot interference filter in the Y-axis direction.

A filter array includes filters disposed in a two-dimensional plane and having different transmission spectra. The filters include a first filter with a transmission spectrum having a first peak group including first and second peaks adjacent to each other, and at least one second filter with a transmission spectrum having a second peak group including third and fourth peaks adjacent to each other. Of peaks included in the second peak group, the third peak has a wavelength closest to a wavelength at the first peak. A first interval between the wavelength at the first peak and a wavelength at the second peak is different from a second interval between the wavelength at the third peak and a wavelength at the fourth peak. ΔFSR / σ≥0.25, where ΔFSR denotes an absolute value of a difference between the first and second intervals and σ denotes a half-width of the first peak.

The application provides a camera, which comprises a light guiding module for receiving external image light and splitting the image light into first light and second light; an image sensing module for receiving the first light and converting the first light into image data; a spectrometer module for receiving the second light and obtaining spectral information of the second light; and a processor electrically connected to the image sensing module and the spectrometer module, for adjusting the image data according to the spectral information, wherein the image data comprises a plurality of pixel data, each of the pixel data comprises light intensity information of three primary color lights, and the processor is used for adjusting the light intensity information corresponding to each of the primary color lights in the pixel data according to the spectral information. The application also provides an image data adjusting method.

The present disclosure describes a capacitively controlled Fabry-Perot interferometer including a first mirror layer having a first thin-film metal layer embedded in a first insulating layer and a second mirror layer having a second thin-film metal layer embedded in a second insulating layer. A control region in the first thin-film metal layer is at least partially aligned in an actuation direction with a control region in the second thin-film metal layer. The interferometer also includes a first control electrode and a first dielectric layer, the first dielectric layer being between the first control electrode and at least a portion of the control region of the first thin-film metal layer.

The application relates to the technical field of trace molecule detection, in particular to a photoelectric detection and sensing integrated digital metasurface infrared spectrum chip and a preparation method thereof. The chip comprises, from bottom to top, a substrate, a metal reflection layer, a metal nanoparticle layer, a pyroelectric photosensitive layer and a digital metasurface structure layer; the digital metasurface structure layer is in a discrete pattern composed of a pixel array in the transverse direction of the device, the digital metasurface structure layer can excite surface plasmon resonance under the irradiation of preset light waves, the light field energy is localized in the target molecules and the pyroelectric photosensitive layer, so that the responsivity and sensing sensitivity of the infrared spectrum chip are improved; and the array coding of the discrete pattern of the digital metasurface structure layer is designed through a preset algorithm, so that the electric field intensity at the preset spatial position is enhanced. The chip has the advantages of high responsivity, high sensing sensitivity and high signal-to-noise ratio.

A device used in a system for generating spectral images corresponding to four or more wavelength bands includes optical filters different in spectral transmittance and an image sensor that detects light through the optical filters, in which when the wavelength bands are given numbers in an ascending or descending order of a central wavelength, the image sensor outputs i-th mask data by detecting only light corresponding to an i-th wavelength band and outputs j-th mask data by detecting only light corresponding to a j-th wavelength band among the wavelength bands, a correlation coefficient between the i-th and j-th mask data is greater than or equal to 0.8 in a combination where |i−j| is 1, and is equal to or less than 0.8 in at least one combination where |i−j| is greater than or equal to 2 and less than or equal to N−1.

In particular, multi-band optical fiber temperature sensors configured to provide temperature measurements independent of changes in the optical path are described. The systems and devices described herein include phosphorescent time constant temperature sensors that use one or more portions of the emission spectrum to measure more than one time-dependent parameter (e.g., one or more time constants) from the emission spectrum of one or more phosphors. Accuracy and reproducibility can be improved by measuring the time-dependent parameter (e.g., the time decay or time constant of the intensity of the phosphorescent emission) in one portion of the emission spectrum or in more than one different portion of the emission spectrum. Limiting the measurement of the time-dependent parameter to a portion of the emission spectrum can reduce the dependency of the time-dependent value on the attenuation spectrum (or frequency response) of the optical path between the phosphor and the detector and / or the attenuation spectrum of the matrix in which the phosphor is disposed.

An optical filter according to one aspect of the present disclosure comprises a filter array including a plurality of filters two-dimensionally arrayed and a band-pass filter. The plurality of filters includes a first filter and a second filter. A transmission spectrum of each of the first filter and the second filter has local maximum values of transmittance at three or more wavelengths included in a first wavelength region. The band-pass filter passes light in a second wavelength region including two or more wavelengths of the three or more wavelengths and not including one or more wavelengths of the three or more wavelengths. The filter array and the band-pass filter are disposed so that (a) the band-pass filter is located on an optical path of transmitted light that passes through the first filter and the second filter or (b) the first filter and the second filter are located on an optical path of transmitted light that passes through the band-pass filter.

A sample observation device (1) comprising: a light source (10); an objective lens (13); a multimode optical fiber (15); an optical dispersion element (18) configured to allow angular dispersion of the light transmitted by the objective lens as a function of wavelength; an image sensor (19) configured to form an image of the light dispersed by the optical dispersion element; and a processing unit (30) configured to accumulate the intensity detected on pixels along each isofreference line, so as to obtain a frequency spectrum, taking into account the curved shape of each isofreference line. Figure 6A.

A measurement optical system 1 includes, in order from the object side, an optical filter 30, a front group 41, an aperture 42, and a rear group 43. The aperture 42 is disposed in the vicinity of a rear focal point f22 of the front group 41 and in the vicinity of a front focal point f31 of the rear group 43. An opening AP of the aperture 42 is formed in a non-point symmetric shape centered on an optical axis Ax1 of the rear group 43, in a plane including the aperture 42.

To provide an imaging element that acquires linear polarization information necessary for calculating a Stokes parameter.SOLUTION: An imaging element includes a wedge 111 having birefringence, a polarizer array 113 in which a plurality of sets of polarizers having mutually different transmission axis directions, on which light transmitted through the wedge is incident, are arranged in a plane intersecting the light incident direction, and a light-receiving element array 115 in which a plurality of light-receiving elements on which light transmitted through the polarizer array is incident is arranged so as to correspond to the plurality of polarizers of the polarizer array. From among the plurality of polarizers having the same transmission axis direction in the polarizer array, the same phase difference may be generated for light incident on some of the polarizers, and different phase differences may be generated for light incident on the remaining polarizers.SELECTED DRAWING: Figure 2

The invention relates to a Fabry-Pérot cavity demodulation device (40), comprising: - at least two laser sources (12, 14), one with a first wavelength (λ1), the other with a second wavelength (λ2), different from the first wavelength; - optical means (22, 24, 30, 32) for directing the laser beams from these at least two sources towards a Fabry-Pérot cavity (40) and for capturing the laser beams from these at least two sources that are reflected by this cavity; - at least one detector (52, 54) for receiving the intensities of the laser beams from these at least two sources that are reflected by this cavity; - computing means (70) for calculating the ratio of said intensities. Figure 2