Described herein are a spectrometer system and a spectrometer device, which are suited for investigation or monitoring purposes, in particular, in the infrared (IR) spectral region, and for a detection of heat, flames, fire, or smoke.

The spectrometer device allows capturing incident light from an object and transferring the incident light to a length variable filter with a particularly high concentration efficiency. Apart from the spectrometer device, the spectrometer system further includes an evaluation unit designated for determining information related to a spectrum of an object by evaluating the detector signals provided by the spectrometer device.

One embodiment includes a sequential spectral imaging system with a color filter disposed over imaging sensor. The color filter includes zones of multiple color elements of discrete or continuous spectra. The color filter is configured to have multiple cycles of wavelength bands along diagonal lines of the imaging sensor, each cycle of wavelength bands includes a full spectra from red to blue. Another embodiment combines an imaging sensor of a wide FOV with pixelated color filters and a spectra sensor of smaller FOV. A calibration technique acquires imaging sensor's spectral response. The sequential spectral imaging system acquires a sequence of continuous frames of spatial and spectral data during recording an object moving relatively to the camera. Multiple frames of the moving object are tracked sequentially. Image processing to correct distortion and extract features enables identification and tracking of the object. The object's full spectra is established by connecting different frames.

The absorbance of a mixed sample at multiple wavelengths is determined and the concentrations of the sample constituents deduced from the observed absorbances. Assuming the sample constituents are known, these wavelengths correspond to peak absorption wavelengths for the constituents. Rather than attempt to generate an analytical relationship among absorbance levels and constituent concentrations, a database of absorbance values for each wavelength, spanning the range of possible analyte concentrations, is employed instead. In general, the wavelengths utilized correspond to peak absorption wavelengths for each of the analytes.

A method and apparatus for field spectroscopic characterization of seafood is disclosed. A portable NIR spectrometer is connected to an analyzer configured for performing a multivariate analysis of reflection spectra to determine qualitatively the true identities or quantitatively the freshness of seafood samples.

Described herein is a spectrometer device. The spectrometer device includes: at least one filter element adapted to separate at least one incident light beam into a spectrum of constituent wavelength; at least one sensor element having a matrix of optical sensors, the optical sensors (116,142) each having a light-sensitive area; and at least one evaluation device configured for determining at least one longitudinal coordinate of an object.

An infrared spectrometer for operation in the mid-infrared spectral range is disclosed, where the spectrometer includes a Bragg-mirror-based spectral filter that is operative for providing an output optical signal whose spectral content is spatially dispersed along a first direction, where the Bragg mirrors include low-refractive-index layers comprising a polymer material that is transmissive across the mid-infrared spectral range and is characterized by less than ten absorption peaks with the operating spectral range of the spectrometer.

Described herein are a spectrometer system and a spectrometer device, which are suited for investigation or monitoring purposes, in particular, in the infrared (IR) spectral region, and for a detection of heat, flames, fire, or smoke.

The spectrometer device) allows capturing incident light from object and transferring the incident light to a length variable filter with a particularly high concentration efficiency. Apart from the spectrometer device the spectrometer system further includes an evaluation unit designated for determining information related to a spectrum of an object by evaluating the detector signals provided by the spectrometer device.

An imaging system images a sample across one or more wavelengths. A light source illuminates a sample with one or more wavelengths of light, and an image sensor detects light from the illuminated sample. A linear variable long pass filter is positioned to filter light reflected from the sample to pass to the image sensor multiple different wavelength bands having different cut-off wavelengths. Wavelengths of light on one side of the cut-off wavelength are blocked and wavelengths of light on the other side of the cut-off wavelength are passed as multiple different long pass wavelength bands for detection by the image sensor. The image sensor detects light for each of the multiple different long pass wavelength bands from the sample. Data processing circuitry converts the detected light for the multiple different long pass wavelength bands for the sample into corresponding different long pass wavelength band data sets for the sample.

Systems and methods for forming a compact gas sensor include a multilayer etalon as a wavelength discriminating element. The position of the etalon may be adjusted to tune its transmission profile. And embodiment directed to carbon dioxide detection is described.

A variable optical filter is disclosed including a bandpass filter and a blocking filter. The bandpass filter includes a stack of alternating first and second layers, and the blocking filter includes a stack of alternating third and fourth layers. The first, second and fourth materials each comprise different materials, so that a refractive index of the first material is smaller than a refractive index of the second material, which is smaller than a refractive index of the fourth material; while an absorption coefficient of the second material is smaller than an absorption coefficient of the fourth material. The materials can be selected to ensure high index contrast in the blocking filter and low optical losses in the bandpass filter. The first to fourth layers can be deposited directly on a photodetector array.