49results about "Spectrum generation using multiple reflection" patented technology

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

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.

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.

Optical Flux Attenuation Device The present invention relates to an attenuation device (14) of a polychromatic optical flux around a wavelength of interest, the wavelength of interest being included in the wavelengths of the polychromatic optical flux, the polychromatic optical flux being collimated, the attenuation device (14) comprising: a Fabry-Pérot filter (20) formed of two semi-reflective plates spaced apart from each other, a control unit (22) of the Fabry-Pérot filter (20), the control unit (22) being adapted to: modify the spacing between the two semi-reflective plates so that the central wavelength of the Fabry-Pérot filter (20) is the wavelength of interest, and modify the inclination between the two semi-reflective plates to adjust the amount of polychromatic optical flux transmitted around the wavelength of interest. Figure for the abridged version: 1

The present disclosure concerns a method for characterizing a photovoltaic module, by means of a device for characterizing a photovoltaic module, the characterizing device comprising a light source so as to illuminate an object, a spectrometer comprising an optical acquisition axis and a polarizing filter comprising a polarization axis and arranged in front of the spectrometer, the light reflected by the object passing through the polarizing filter to be subsequently captured by the spectrometer, and a processing unit.

A multiple-wavelength reflective Raman probe includes a first parabolic mirror, a second parabolic mirror, a third parabolic mirror, and a fourth parabolic mirror. The first parabolic mirror receives a laser light, and reflects as a collimated light beam. The second parabolic mirror receives the collimated light beam, and condenses to a convergent light beam. The third parabolic mirror has a through hole. The convergent light beam passes through the through hole, and is focused on the sample detecting position. The third parabolic mirror also collects the light reflected by the sample detecting position and reflects as a collimated detection light beam. The fourth parabolic mirror collects the detection light beam, and condenses to a detection output light beam. The detection output light beam is focused at a focal point of the fourth parabolic mirror to be collected by a spectrometer.

A light detection device 1A includes a Fabry-Perot interference filter 10, a light detector 3, a spacer 4 that has a placement surface on which a portion outside a light transmission region 11 in a bottom surface of the interference filter 10 is placed, and an adhesive member 5 that adheres the interference filter 10 and the spacer 4 to each other. Elastic modulus of the adhesive member 5 is smaller than elastic modulus of the spacer 4. At least a part of a lateral surface of the interference filter 10 is located on the placement surface such that a part of the placement surface of the spacer 4 is disposed outside the lateral surface. The adhesive member 5 is disposed in a corner portion formed by the lateral surface of the interference filter 10 and the part of the placement surface of the spacer 4 and contacts each of the lateral surface and the part of the placement surface.

The optical system includes a first optical element comprising a first substrate, a partial reflection coating disposed on a first surface of the first substrate, and a first metamaterial layer disposed on or adjacent to the first surface of the first substrate and having a structure that defines a continuous phase gradient along a first direction parallel to the first surface of the first substrate; and a second optical element comprising a second substrate and a second metamaterial layer disposed on or adjacent to the first surface of the second substrate and having a structure that defines a continuous phase gradient along a second direction parallel to the first surface of the first substrate, wherein at least one surface of the second optical element is curved along the second direction.

Provided is a spectroscopic camera capable of capturing a spectroscopic image in which the influence of ghosting is suppressed. A spectroscopic camera (1) includes a plurality of flat plate elements including a standard; a first lens group disposed at a position closer to an object side than the standard; a second lens group disposed at a position closer to an image side than the standard; and a capturing element that receives light that has passed through the second lens group from the standard, wherein parallel light that has been collimated by the first lens group is incident on the plurality of flat plate elements, the second lens group constitutes an imaging optical system that causes light that has passed through the plurality of flat plate elements to be imaged on the capturing element, and the Fresnel reflection interface, on which no antireflection film is disposed, is two-sided or less in the plurality of flat plate elements on which the parallel light is incident.

A light detecting device according to one aspect of the present disclosure comprises: a filter array including a plurality of filters that is two-dimensionally arrayed, wherein each of first and second filters included in the plurality of filters includes a first reflective layer, a second reflective layer, and an intermediate layer therebetween and has a resonance structure having resonant modes whose orders are different from each other, a refractive index and / or a thickness of the intermediate layer in the first and second filters is different depending on the filter, a transmission spectrum of each of the first and second filters has local maximum values of transmittance at a plurality of wavelengths included in a certain wavelength region, and the wavelengths correspond to the resonant modes, respectively; and an image sensor including a plurality of light detection elements, wherein each light detection elements is disposed at a position where the light detection element receives light that passes one of the plurality of filters and has sensitivity to light in the wavelength region.

A light detection system includes a Fabry-Perot interference filter including a first mirror and a second mirror, a distance therebetween being variable, a light detection unit configured to detect light in a wavelength range of λ1 or more and λ2 or less, and a control unit configured to apply a voltage to the Fabry-Perot interference filter such that the distance changes in a distance range of d1 or more and d2 or less. For a transmission spectrum T1 (λ) of light in a case where the distance is d1, a peak transmittance T1 (λa) appears within the wavelength range, and a transmittance T1 (λ2) is less than or equal to 1%. For a transmission spectrum T2 (λ) of light in a case where the distance is d2, a peak transmittance T2 (λb) appears within the wavelength range, and a transmittance T2 (λ1) is less than or equal to 1%.

A system includes a semiconductor process interface and a processor. The processor is configured to initiate etalon free run motion; initiate free run image frame capture via the semiconductor process interface; determine whether a full set of band passes has been captured; and, in response to the full set of band passes having been captured, remove gaps not on spectrum reconstruction list and construct a data cube using data from gaps not removed. The system further includes a memory coupled to the processor and configured to provide the processor with instructions.

This invention provides a spectral camera capable of capturing spectral images with suppressed ghosting effects. [Solution] The spectroscopic camera 1 comprises a plurality of planar elements including an etalon, a first lens group positioned on the object side of the etalon, a second lens group positioned on the image side of the etalon, and an image sensor that receives light that has passed from the etalon through the second lens group. Parallel light collimated by the first lens group is incident on the plurality of planar elements, and the second lens group constitutes an imaging optical system that forms an image on the image sensor of the light that has passed through the plurality of planar elements. In the plurality of planar elements into which the parallel light is incident, there are two or fewer Fresnel reflection interfaces where an anti-reflective coating is not provided.

Provided is an optical filter having a low transmittance for obliquely incident light in a visible region. This optical filter comprises: a first substrate that includes a first upper surface and a first lower surface; a first reflection and scattering part that is provided on the first lower surface of the first substrate, reflects and scatters first light, which is light in at least a partial wavelength band in a visible region, and transmits second light, which is light in at least a partial wavelength band in an infrared region; a filler that is disposed below the first substrate; a second substrate that is disposed below the filler and includes a second upper surface and a second lower surface; and a second reflection and scattering part that is provided on the second upper surface of the second substrate, reflects and scatters the first light, and transmits the second light.

According to one aspect of the presently disclosed subject matter, there is provided an apparatus configured to allow light to be shone onto a tunable filter, each time onto a different portion thereof, and to detect an optical response (e.g., transmission or reflection of the portion shone by the light). By detecting the optical response of the different portions of the tunable filter, each time isolated from the illumination, the state of the tunable filter at the illuminated portion (e.g., an optical gap between a movable component and a fixed component of the tunable filter) can be determined. By monitoring different portions of the tunable filter, a general state of the tunable filter can be determined. For example, the general state of the tunable filter can be determined based on the optical gap of the different portions of the tunable filter, while the driving parameters remain unchanged.

A spectral camera includes: multiple planar plates including an etalon; a first lens group disposed closer to an object side than the etalon; a second lens group disposed closer to an image side than the etalon; and an imager configured to receive light passing through the etalon and the second lens group, parallel light collimated by the first lens group being incident on the multiple planar plates, the second lens group constituting an imaging optical system configured to bring light passing through the multiple planar plates into focus at the imager, and the number of Fresnel reflection interfaces at which no antireflection film is provided out of Fresnel reflection interfaces of the multiple planar plates, on which the parallel light is incident, being two or smaller.

A Fourier transform spectrometer 100 includes an interferometer 10, which includes a fixed mirror 11, a movable mirror 12, and a detector 101, wherein: the mirrors 11 and 12 are positioned parallel to each other and form an optical cavity; the movable mirror 12 is operable to move relative to the fixed mirror 11 to change the size of the optical cavity; a first mirror in the mirrors is positioned such that light 14 received from a sample passes through the back of the first mirror into the optical cavity; the detector 101 is positioned and operable to detect light that has passed through the back of a second mirror in the mirrors and exits the optical cavity and outputs an interferogram; and the mirrors 11 and 12 are spaced apart from each other such that the movable mirror is positioned or can be moved to a position in which at least two paths 16, 31 of the received light 14 reflected within the interferometer toward the detector 101 have equal lengths.

The present invention relates to an optical member comprising a substrate and a multilayer film, wherein the multilayer film has a fluoride film and a film having a refractive index different from that of the fluoride film, the fluoride film contains a rare earth element or an alkaline earth metal element, and the fluoride film has a measured band gap value Egm that is not greater than a prescribed proportion relative to a theoretical band gap value Egc.

The present disclosure relates to, but is not limited to, multispectral sensor response balancing. An optical filter can include a substrate. The optical filter can include a first mirror. The optical filter can include a second mirror. The optical filter can include a spacer. The first mirror, the second mirror, and the spacer can form a plurality of component filters. A first component filter of the plurality of component filters can be associated with a first cross-sectional area, and a second component filter of the plurality of component filters is associated with a second cross-sectional area. The first cross-sectional area and the second cross-sectional area can be configured to balance the first component filter and the second component filter in response.

The present exposition relates to a method for characterizing a photovoltaic module (M), using a photovoltaic module characterization device (M), the characterization device comprising a light source (S) so as to illuminate an object (M, R), a spectrometer (SP) comprising an optical acquisition axis (BB) and a polarizing filter (F) comprising a polarization axis (CC) and disposed in front of the spectrometer (SP), the light reflected by the object (M, R) passing through the polarizing filter (F) to be captured subsequently by the spectrometer (SP), and a processing unit (U).

The present invention relates to the art of spectral detection and discloses a spectral filter and spectrometer based on a multi-stage resonant chamber structure, which is arranged in a computational spectrometer when in use and has at least one optical path, wherein at least n+1 linearly arranged mirrors are provided in one optical path, n∈N and n≧2, and the mirrors have a reflectance of 5% to 50%. Resonant chambers are formed between two adjacent mirrors, and the linearly arranged n+1 mirrors constitute n stages of resonant chambers, the chamber length of each resonant chamber being 20μm to 2000μm, and the chamber lengths of at least two resonant chambers are different or the reflectances of at least two mirrors are different so that the n stages of resonant chambers can generate random transmission spectra in the frequency domain.

Hyperspectral imaging systems and methods for hyperspectral imaging of scenes in apparent motion are described. Each acquired image includes a spatial map of the scene which facilitates pointing, focusing, and data analysis. The spectral measurement parameters can be configured dynamically in order to optimize performance such as spectral resolution, storage capacity, and transmission bandwidth, without physical or optical reconfiguration of the imaging system, and with no need for moveable mechanical parts. The system achieves high spectral and spatial resolution, is simple, compact, and lightweight, thereby providing an efficient hyperspectral imaging system for aircraft or spaceborne imaging systems.

A light detection device 1A includes a Fabry-Perot interference filter 10, a light detector 3, a spacer 4 that has a placement surface on which a portion outside a light transmission region 11 in a bottom surface of the interference filter 10 is placed, and an adhesive member 5 that adheres the interference filter 10 and the spacer 4 to each other. Elastic modulus of the adhesive member 5 is smaller than elastic modulus of the spacer 4. At least a part of a lateral surface of the interference filter 10 is located on the placement surface such that a part of the placement surface of the spacer 4 is disposed outside the lateral surface. The adhesive member 5 is disposed in a corner portion formed by the lateral surface of the interference filter 10 and the part of the placement surface of the spacer 4 and contacts each of the lateral surface and the part of the placement surface.

The present invention provides an optical filter which has a low transmittance with respect to obliquely incident visible light. The present optical filter comprises: a substrate which includes a first surface and a second surface that is on the side opposite from the first surface; a reflection and scattering part which is provided to the first surface, which reflects and scatters first light in at least a portion of a wavelength band in the visible region, and which transmits second light in at least a portion of a wavelength band in the infrared region; a filler which is disposed on the first surface side; and a reflection multilayer film which is disposed on the second surface side, which reflects the first light, and which transmits the second light; wherein, when light having a wavelength of 400-600 nm is incident at an incidence angle of θ degrees and the average value of transmittances is regarded as T_400-600(θ), T_400-600(0)≤9% and T_400-600(50)≤9%.

A tunable or swept laser architecture that is appropriate for swept source optical coherence tomography and other applications including spectroscopy employing a cat's-eye configuration with a preferably transmissive tilt tuned interference thin film filter.