Abstract:
A refractometer and a method for measuring refractive index is disclosed. The refractometer comprises a light source, a reflecting module, a lens module, an array sensor, and a processor, wherein the reflecting module is configured to receive optical beams from the light source, the reflecting module comprises a detection surface configured to totally reflect at least part of the optical beams; the lens module is configured to converge optical beams from the detection surface onto a focal plane of the lens module; and the array sensor is located on the focal plane of the lens module.
Abstract:
A method for measuring optical signal detector performance that includes directing light emitted from an optical signal detector onto a first non-fluorescent surface portion in a first detection zone of the optical signal detector. A first characteristic of light detected by a first sensor of the first optical signal detector is measured while the first non-fluorescent surface portion is in the first detection zone of the optical signal detector. Light emitted from the optical signal detector is directed into a first void in the first detection zone of the optical signal detector. A second characteristic of light detected by the first sensor of the optical signal detector is measured while the first void is in the first detection zone of the optical signal detector. And an operational performance status of the optical signal detector is determined based on at least one of the first characteristic and the second characteristic.
Abstract:
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.
Abstract:
The disclosure relates to processing SPR signals, in particular signals obtained by illuminating a conductive surface with light at two wavelengths. Embodiments—involve processing a first and second signal indicative of an intensity of light, received from a conductive layer at which SPR has occurred, as a function of angle of incidence, reflection or diffraction at the layer (depending on whether the incident light beam is received by a detector recording it in reflection or transmission from the conductive layer). The first and second signals each have two dips corresponding to a respective wavelength of the light at a respective angle at which surface plasmon resonance occurs for the respective wavelength and a peak between the two dips. The processing includes deriving a first and second value of a quantity indicative of signal magnitudes in the region of the peak. The method then provides for comparing the first and second values to detect a change in refractive index at the layer after the first signal and before the second signal was captured.
Abstract:
An optical system includes a sample carrier receiving region configured to receive a carrier carrying a sample for processing, a source that emits an excitation signal having a wavelength within a first predetermined wavelength range, and a first set of optical components that direct the excitation signal along an excitation path to the sample carrier receiving region, wherein radiation having a wavelength within a second predetermined wavelength range is emitted from the sample carrier receiving region in response to receiving the excitation signal. The system further includes a detector configured to detect the emitted radiation and generates a signal indicative of a power of the detected radiation and a second set of optical components that directs the emitted radiation along a collection path to the detector and a power meter that measures a power of the radiation emitted from the sample carrier receiving region and generates a signal indicative thereof.
Abstract:
The invention is an optical measuring unit (10) for carrying out a reflective measurement, the unit comprising a light source (11) suitable for illuminating a surface to be measured, a measuring sensor (12a, 12b) for detecting a light reflected by the surface to be measured, and a light blocking optical element (13) separating the measuring sensor (12a, 12b) from the direct light of the light source (11) and having an internal space that comprises a straight centreline light tube (14) extending from the light source (11) to the surface to be measured. The inner space of the light blocking optical element (13) comprises a shaded space (19) extending from the centreline of the light tube (14) farther than the light tube (14), in which a monitoring sensor (15) is arranged, said monitoring sensor (15) being subjected to a part of the direct light of the light source (11) and enabling compensation of a change of the light emission of the light source (11). On the other hand, the invention is a method for carrying out a reflective measurement by an optical measuring unit (10).
Abstract:
Describes a nephelometric turbidity sensor device which embodies: methods for: (a) attenuation of entrained air, (b) attenuation of bubbles, (c) attenuation of scattered light (d) interchangeable light sources with automatic indexing of algorithms (e) anti-fog windows and (f) verification of operation by self-check and (g) self-calibration.
Abstract:
A standard plane sample which supplies an optical characteristic measuring device with reference data. The standard plane sample including a sample portion that is measured by the optical characteristic measuring device to supply measurement data, and a recording medium that stores identification data for identifying a kind of the sample portion as well as reference data corresponding to the optical characteristic of the sample portion.
Abstract:
A system and method of automated incubating and reading of biological indicators is disclosed. In one embodiment, the automated biological indicator incubator is configured to control the temperature of incubation test wells to a desired temperature range suitable for use with a biological indicator, control the incubation period, and detect a change in the biological indicator colored media providing an indication of growth or lack of growth. In other embodiments, the automated biological indicator incubator is self-calibrating, and provides a communication interface to an external device, such as a computer. The communication interface is suitable for use to collect and analyze data associated with the biological indicator during the incubator period, and for making a determination of growth or lack of growth and success of the sterilization process as well as a permanent document of the monitoring of the sterilization process.
Abstract:
A non-invasive emitter-photodiode sensor which is able to provide a data-stream corresponding to the actual wavelength of light emitted thereby allowing calibration of the sensor signal processing equipment and resulting in accurate measurements over a wider variation in emitter wavelength ranges.