A device may determine a calibration value for a spectrometer using light from a first light source; deactivate the first light source after determining the calibration value; perform measurement with regard to a sample based on the calibration value, wherein the measurement of the sample is performed using light from a second light source; determine that the calibration value is to be updated; and update the calibration value using the light from the first light source.

A device may determine a calibration value for a spectrometer using light from a first light source; deactivate the first light source after determining the calibration value; perform measurement with regard to a sample based on the calibration value, wherein the measurement of the sample is performed using light from a second light source; determine that the calibration value is to be updated; and update the calibration value using the light from the first light source.

An optical gas sensor device includes: a light source that emits an infrared ray to a detection target gas; an optical filter that transmits an infrared ray having a wavelength corresponding to an absorption wavelength of the detection target gas; a light receiver that detects the infrared ray entering through the optical filter and generates a detection signal; and a signal processor. The signal processor calculates a gas concentration of the detection target gas or a value corresponding to the gas concentration, based on the detection signal, compares the calculated gas concentration or the calculated value corresponding to the gas concentration with a predetermined threshold, and determines a state of the optical gas sensor device, based on a result of the comparison.

An example cartridge includes a base having a channel configured to receive fluid, where the fluid includes a test sample to be tested on the cartridge, and a structure including at least part of a fluidic duct. The structure is configured to move relative to the base between a first position and a second position. In the first position, the channel and fluidic duct are aligned to create a fluidic connection between the channel and the fluidic duct and, in the second position, the channel and the fluidic duct are unaligned to block a fluidic connection between the channel and the fluidic duct.

Systems and methods for calibrating non-spatial measurements of a device under test (DUT) for misalignment between the DUT and a non-spatial measurement device are disclosed herein. A system for generating a misalignment calibration database can include, for example, a non-spatial measurement device and a high-precision translation stage. The system can generate a misalignment calibration database by taking measurements of a DUT at multiple misalignment locations. A system for measuring a DUT can include, for example, a spatial measurement device, a non-spatial measurement device, a translation stage, and/or a carrier tray. The system can capture measurements of the DUT at a first position and calibrate the measurements for misalignment using calibration data corresponding to the first position. For example, the system can retrieve calibration data from a calibration misalignment system that was taken at the same and/or different locations proximate the position of the DUT.

The present invention relates to a method (500) for enhancing a Raman contribution in a spectrum of a sample (102), the method (500) comprising: Recording (504) a first spectrum of light (200) comprising information associated with ambient light and a first measurement response, wherein the first measurement response comprises a first optical response and a first Raman response of the sample (102) in response to being illuminated with light (104), having a first spot size (103b), from a light source (110). Recording (508) a second spectrum of light (300) comprising information associated with ambient light and a second measurement response, wherein the second measurement response comprises a second optical response and a second Raman response of the sample (102) in response to being illuminated with light (104), having a second spot size (103a), from the light source (110). Wherein the first spot size (103b) is larger than the second spot size (103a), whereby a contribution, to the first measurement response, of the first Raman response in relation to a contribution of the first optical response is smaller than a contribution, to the second measurement response, of the second Raman response in relation to the second optical response. Forming (510) a data set (400) based on a dissimilarity between the first spectrum (200) and the second spectrum (300), thereby enhancing a contribution of a Raman response to the formed data set (400). A spectroscopy system (100), a computer program and a non-transitory computer-readable storage medium are also disclosed.

The invention relates to a method for measuring a concentration of a gas in a gas mixture, said method comprising that: a light beam modulated in a ramp shape and/or in a step shape in its wavelength and additionally periodically modulated, in particular in its wavelength, is transmitted from a light source, in particular a laser, into a measurement zone; the modulated light beam passes through a gas mixture in the measurement zone and is detected as reception light by a detector, wherein the reception light is converted by the detector into a detector signal; a derivative signal is determined based on the detector signal by performing a transformation of the detector signal into the frequency range, in particular by a Fourier transform of the detector signal, wherein an evaluation of the detector signal transformed into the frequency range is performed, in particular only, for an n-fold of the frequency of the modulated light beam in order to obtain the derivative signal; and at least two measurement values of a phase of the derivative signal are determined and a correction function is calculated based on the determined measurement values of the phase of the derivative signal in order to correct the derivative signal with the correction function.

A micro-Raman apparatus (100) includes a light source unit (110), an objective lens unit (140), a detection device (160), a drive device (180), and a controller (200) for controlling the drive device (180). The light source unit (110) includes a plurality of light source devices (111 to 114) configured to emit lights of different wavelengths from one another. The objective lens unit (140) collects light from the light source unit (110) and irradiates a sample (SMP) to be analyzed with the light. The detection device (160) detects Raman-scattered light emitted from the sample (SMP). The drive device (180) changes a relative distance between the sample (SMP) and the objective lens unit (140). The controller (200) is configured to correct the relative distance in accordance with a wavelength of light emitted from a light source device to be used.