Abstract:
A multispectral imaging color measurement system, comprising a dark room, a sample platform and an imaging device for capturing said object being measured; a controllable illumination device, a filter wheel unit, an imaging signal processing unit and an electronic control unit. A method for processing imaging signals of the multispectral imaging color measurement is also proposed. The multispectral imaging color measurement system and the method for processing imaging signals thereof can overcome the inaccuracy of traditional digital imaging systems and the limits of spectrophotometer systems and provide users in the textile industry with highly accurate color measurement and evaluation.
Abstract:
Optical computing devices are disclosed. One exemplary optical computing device includes an electromagnetic radiation source configured to optically interact with a sample and first and second integrated computational elements arranged in primary and reference channels, respectively. The first and second integrated computational elements produce first and second modified electromagnetic radiations, and a detector is arranged to receive the first and second modified electromagnetic radiations and generate an output signal corresponding to the characteristic of the sample.
Abstract:
A spectral image sensor device comprises a first optical system 47 and 48 including an objective lens, a luminous fluxes selecting member 55 for allowing a part of the luminous fluxes to pass via the first optical system selectively, an optical member 58 where the luminous fluxes selecting member is disposed so as to be at focal position on an object side or approximately at focal position on an object side, and an interference membrane is formed, and wavelength range of the luminous fluxes for passing through the luminous fluxes selecting member is selected, depending on position of the luminous fluxes selecting member, a second optical system 49 for guiding the luminous fluxes toward the optical member, and an image sensor 52 for receiving a light in wavelength range as selected by the optical member.
Abstract:
An integrated circuit for an imaging system is disclosed. In one aspect, an integrated circuit has an array of optical sensors, an array of optical filters integrated with the sensors and configured to pass a band of wavelengths onto one or more of the sensors, and read out circuitry to read out pixel values from the sensors to represent an image. Different ones of the optical filters are configured to have a different thickness, to pass different bands of wavelengths by means of interference, and to allow detection of a spectrum of wavelengths. The read out circuitry can enable multiple pixels under one optical filter to be read out in parallel. The thicknesses may vary non monotonically across the array. The read out, or later image processing, may involve selection or interpolation between wavelengths, to carry out spectral sampling or shifting, to compensate for thickness errors.
Abstract:
An angle limiting filter includes: a first light-shielding layer containing a first light-shielding material and provided with a first opening; a second light-shielding layer containing a second light-shielding material and located in a region which surrounds at least one portion of the first light-shielding layer; a third light-shielding layer containing the first light-shielding material, provided with a second opening at least one portion of which overlaps the first opening, and located above the first light-shielding layer; and a fourth light-shielding layer containing the second light-shielding material and located above the second light-shielding layer in a region which surrounds at least one portion of the third light-shielding layer.
Abstract:
In order to reduce light leak influencing the detection capability of a fluorescence imaging apparatus, an interference filter and an absorption filter on an emission-side filter section are arranged serially in the traveling direction of the fluorescence. The interference filter and the absorption filter that are in use for such an arrangement block the waveband light equivalent to the excitation light irradiated onto a sample while fully transmitting the waveband light equivalent to the fluorescence.
Abstract:
An instrument detects an amount of a component of a sample gas by passing an excitation light through the sample gas at atmospheric pressure to produce fluorescence light from the component. The fluorescence light is discriminated using a sequence of multiple long pass interference filters to filter out the excitation light. The discriminated fluorescence light is then detected to produce a signal representative of the amount of the component in the sample gas. Preferably, the excitation light is continuously passed through the sample gas. In one embodiment, the gas flows through a cell having a parabolic reflector as an interior surface and a source of the excitation light at a focus of the parabolic reflector. In other embodiments, multiple components are detected in parallel using multiple sample cells and a fiber optic multiplexer to sequentially filter and detect the fluorescence light from each of the multiple sample cells.
Abstract:
In this spectral instrument, a plurality of interference filters 31, 32 . . . with transmitting wavebands different from each other are arranged in order so that light reflected by a specific interference filter 31 is made incident on the interference filter 32 on the next stage, and at positions on which light transmitted through each interference filter is made incident, photodetecting devices 41, 42 . . . are provided, wherein a silver thin film 31a with a thickness of 20 to 200 nm is provided on the light incidence surface side of the interference filter 31 on the first stage.
Abstract:
A laser discrimination filter based on temporal coherence is presented. This filter comprises a multilayer device with "thick" layers such that the optical thickness of each layer is greater than the coherence length of the ambient light, but still much smaller than the coherence length of the laser light of interest. Thus, the spectral response of the device of this invention becomes dependent on the degree of temporal coherence of the incident light. If white light strikes the filter, multi-beam interference will not occur because of its short coherence length. The device acts like a stack of partially reflecting mirrors. If the laser light strikes the filter, multi-beam interference will still take place because of the long coherence length of the laser light. This causes the device to have different transmitting characteristics for laser light and white light. Therefore, this device functions as a laser discrimination device.